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235 results on '"Ravindranath, Swara"'

204. The Morphological Diversities among Star‐forming Galaxies at High Redshifts in the Great Observatories Origins Deep Survey

Author

Ravindranath, Swara, primary, Giavalisco, Mauro, additional, Ferguson, Henry C., additional, Conselice, Christopher, additional, Katz, Neal, additional, Weinberg, Martin, additional, Lotz, Jennifer, additional, Dickinson, Mark, additional, Fall, S. Michael, additional, Mobasher, Bahram, additional, and Papovich, Casey, additional

Published
2006
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205. Erratum: “The Hubble HigherzSupernova Search: Supernovae toz≈ 1.6 and Constraints on Type Ia Progenitor Models” (ApJ, 613, 200 [2004])

Author

Strolger, Louis‐Gregory, primary, Riess, Adam G., additional, Dahlen, Tomas, additional, Livio, Mario, additional, Panagia, Nino, additional, Challis, Peter, additional, Tonry, John L., additional, Filippenko, Alexei V., additional, Chornock, Ryan, additional, Ferguson, Henry, additional, Koekemoer, Anton, additional, Mobasher, Bahram, additional, Dickinson, Mark, additional, Giavalisco, Mauro, additional, Casertano, Stefano, additional, Hook, Richard, additional, Bondin, Stephane, additional, Leibundgut, Bruno, additional, Nonino, Mario, additional, Rosati, Piero, additional, Spinrad, Hyron, additional, Steidel, Charles C., additional, Stern, Daniel, additional, Garnavich, Peter M., additional, Matheson, Thomas, additional, Grogin, Norman, additional, Hornschemeier, Ann, additional, Kretchmer, Claudia, additional, Laidler, Victoria G., additional, Lee, Kyoungsoo, additional, Lucas, Ray, additional, de Mello, Duilia, additional, Moustakas, Leonidas A., additional, Ravindranath, Swara, additional, Richardson, Marin, additional, and Taylor, Edward, additional

Published
2005
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206. Bar Evolution over the Last 8 Billion Years: A Constant Fraction of Strong Bars in the GEMS Survey

Author

Jogee, Shardha, primary, Barazza, Fabio D., additional, Rix, Hans-Walter, additional, Shlosman, Isaac, additional, Barden, Marco, additional, Wolf, Christian, additional, Davies, James, additional, Heyer, Inge, additional, Beckwith, Steven V.W., additional, Bell, Eric F., additional, Borch, Andrea, additional, Caldwell, John A. R., additional, Conselice, Christopher J., additional, Dahlen, Tomas, additional, Häussler, Boris, additional, Heymans, Catherine, additional, Jahnke, Knud, additional, Knapen, Johan H., additional, Laine, Seppo, additional, Lubell, Gabriel M., additional, Mobasher, Bahram, additional, McIntosh, Daniel H., additional, Meisenheimer, Klaus, additional, Peng, Chien Y., additional, Ravindranath, Swara, additional, Sanchez, Sebastian F., additional, Somerville, Rachel S., additional, and Wisotzki, Lutz, additional

Published
2004
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207. TheHubbleHigherzSupernova Search: Supernovae toz≈ 1.6 and Constraints on Type Ia Progenitor Models

Author

Strolger, Louis‐Gregory, primary, Riess, Adam G., additional, Dahlen, Tomas, additional, Livio, Mario, additional, Panagia, Nino, additional, Challis, Peter, additional, Tonry, John L., additional, Filippenko, Alexei V., additional, Chornock, Ryan, additional, Ferguson, Henry, additional, Koekemoer, Anton, additional, Mobasher, Bahram, additional, Dickinson, Mark, additional, Giavalisco, Mauro, additional, Casertano, Stefano, additional, Hook, Richard, additional, Bondin, Stephane, additional, Leibundgut, Bruno, additional, Nonino, Mario, additional, Rosati, Piero, additional, Spinrad, Hyron, additional, Steidel, Charles C., additional, Stern, Daniel, additional, Garnavich, Peter M., additional, Matheson, Thomas, additional, Grogin, Norman, additional, Hornschemeier, Ann, additional, Kretchmer, Claudia, additional, Laidler, Victoria G., additional, Lee, Kyoungsoo, additional, Lucas, Ray, additional, de Mello, Duilia, additional, Moustakas, Leonidas A., additional, Ravindranath, Swara, additional, Richardson, Marin, additional, and Taylor, Edward, additional

Published
2004
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208. The Size Evolution of High-Redshift Galaxies

Author

Ferguson, Henry C., primary, Dickinson, Mark, additional, Giavalisco, Mauro, additional, Kretchmer, Claudia, additional, Ravindranath, Swara, additional, Idzi, Rafal, additional, Taylor, Edward, additional, Conselice, Christopher J., additional, Fall, S. Michael, additional, Gardner, Jonathan P., additional, Livio, Mario, additional, Madau, Piero, additional, Moustakas, Leonidas A., additional, Papovich, Casey M., additional, Somerville, Rachel S., additional, Spinrad, Hyron, additional, and Stern, Daniel, additional

Published
2004
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213. The Size Evolution of High-Redshift Galaxies.

Author

Renzini, Alvio, Bender, Ralf, Ferguson, Henry C., and Ravindranath, Swara

Abstract

It is appropriate in a conference on the growth of galaxies to examine what we know about the evolution of galaxy sizes. Quantifying galaxy size evolution is challenging because most high-redshift galaxies are only barely resolved from the ground. The Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) has greatly improved our ability to measure the spatial structure of distant galaxies. We briefly review previous HST measurements of size evolution and present early results from analysis of the first three-fifths of the Great Observatories Origins Deep Survey (GOODS) ACS data. The observed size evolution appears to follow the basic trends expected from hierarchical models. [ABSTRACT FROM AUTHOR]

Published
2005
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220. Resolved Galaxies in the Hubble Ultra Deep Field: Star Formation in Disks at High Redshift

Author

Meloy, Debra, Elmegreen, Bruce G., Ravindranath, Swara, and Coe, Daniel A.

Abstract

The photometric redshift distributions, spectral types, Sersic indices, and sizes of all resolved galaxies in the Hubble Space Telescope Ultra Deep Field (UDF) are studied in order to understand the environment and nature of star formation in the early universe. Clumpy disk galaxies that are bright at short wavelengths (rest-frame l < 5000 A) dominate the UDF out to z ~ 5.5. Their uniformity in V/Vmax and comoving volume density suggest that they go even further, spanning a total time more than an order of magnitude larger than their instantaneous star formation times. They precede as well as accompany the formation epoch of distant red galaxies and extreme red objects. Those preceding could be the premerger objects that combined to make red spheroidal types at z ~ 2-3. Clumpy disks that do not undergo mergers are likely to evolve into spirals. The morphology of clumpy disks, the size and separation of the clumps, and the prevalence of this type of structure in the early universe suggests that most star formation occurs by self-gravitational collapse of disk gas.

Published
2007

221. The Hubble Higher z Supernova Search: Supernovae to z 1.6 and Constraints on Type Ia Progenitor Models

Author

Strolger, Gregory, Riess, Adam G., Dahlen, Tomas, Livio, Mario, Panagia, Nino, Challis, Peter, Tonry, John L., Filippenko, Alexei V., Chornock, Ryan, Ferguson, Henry, Koekemoer, Anton, Mobasher, Bahram, Dickinson, Mark, Giavalisco, Mauro, Casertano, Stefano, Hook, Richard, Bondin, Stephane, Leibundgut, Bruno, Nonino, Mario, Rosati, Piero, Spinrad, Hyron, Steidel, Charles C., Stern, Daniel, Garnavich, Peter M., Matheson, Thomas, Grogin, Norman, Hornschemeier, Ann, Kretchmer, Claudia, Laidler, Victoria G., Lee, Kyoungsoo, Lucas, Ray, Mello, Duilia de, Moustakas, Leonidas A., Ravindranath, Swara, Richardson, Marin, and Taylor, Edward

Abstract

We present results from the Hubble Higher z Supernova Search, the first space-based open field survey for supernovae (SNe). In cooperation with the Great Observatories Origins Deep Survey, we have used the Hubble Space Telescope with the Advanced Camera for Surveys to cover ~300 arcmin2 in the area of the Chandra Deep Field South and the Hubble Deep Field North on five separate search epochs (separated by ~45 day intervals) to a limiting magnitude of F850LP [?] 26. These deep observations have allowed us to discover 42 SNe in the redshift range 0.2 < z < 1.6. As these data span a large range in redshift, they are ideal for testing the validity of Type Ia supernova progenitor models with the distribution of expected "delay times," from progenitor star formation to Type Ia SN explosion, and the SN rates these models predict. Through a Bayesian maximum likelihood test, we determine which delay-time models best reproduce the redshift distribution of SNe Ia discovered in this survey. We find that models that require a large fraction of "prompt" (less than 2 Gyr) SNe Ia poorly reproduce the observed redshift distribution and are rejected at greater than 95% confidence. We find that Gaussian models best fit the observed data for mean delay times in the range of 2-4 Gyr.

Published
2004

222. Hubble Space Telescope Observations of the CfA Seyfert 2 Galaxies: Near-Infrared Surface Photometry and Nuclear Bars

Author

Martini, Paul, Pogge, Richard W., Ravindranath, Swara, and An, Jin H.

Abstract

We present near-infrared J and H surface photometry of 24 of the nearby Seyfert 1.8, 1.9, and 2 galaxies from the CfA Seyfert sample. The excellent angular resolution of the Hubble Space Telescope probes spatial scales as small as tens of parsecs in most of these active galactic nuclei (AGNs) and is sensitive to the presence of nuclear bars and other potential signatures of the AGN fueling process that channels host galaxy gas and dust to the nuclear region. We have used elliptical isophote techniques to search for nuclear bars in all of these galaxies and have employed a two-dimensional fitting technique to model the nuclear point source and surface brightness distribution of a bright subsample of these galaxies in an attempt to alleviate the impact of the nuclear point source on our sensitivity to nuclear bars. We find stellar nuclear bar candidates in four of these galaxies: Mrk 471, Mrk 270, Mrk 573, and NGC 5929, nearly 20% of the total sample. The percentage rises to ~30% when systems with disturbed morphologies or high inclinations are excluded. The nuclear bars in Mrk 573 and Mrk 270 exhibit some evidence for dust lanes along their leading edges, analogous to the structures seen in host galaxy bars, while the dust lanes in Mrk 471 and NGC 5929 exhibit a more complex morphology. The fact that most of these AGNs do not appear to contain stellar nuclear bars suggests that they are not the fueling mechanism for most low-luminosity AGNs.

Published
2001

223. Erratum: "The Hubble Higher z Supernova Search: Supernovae to z 1.6 and Constraints on Type Ia Progenitor Models" (ApJ, 613, 200 [2004])

Author

Strolger, Gregory, Riess, Adam G., Dahlen, Tomas, Livio, Mario, Panagia, Nino, Challis, Peter, Tonry, John L., Filippenko, Alexei V., Chornock, Ryan, Ferguson, Henry, Koekemoer, Anton, Mobasher, Bahram, Dickinson, Mark, Giavalisco, Mauro, Casertano, Stefano, Hook, Richard, Bondin, Stephane, Leibundgut, Bruno, Nonino, Mario, Rosati, Piero, Spinrad, Hyron, Steidel, Charles C., Stern, Daniel, Garnavich, Peter M., Matheson, Thomas, Grogin, Norman, Hornschemeier, Ann, Kretchmer, Claudia, Laidler, Victoria G., Lee, Kyoungsoo, Lucas, Ray, Mello, Duilia de, Moustakas, Leonidas A., Ravindranath, Swara, Richardson, Marin, and Taylor, Edward

Published
2005

224. A Long Time Ago in a Galaxy Far, Far Away: A Candidate z similar to 12 Galaxy in Early JWST CEERS Imaging

Author

Finkelstein, Steven L., Bagley, Micaela B., Haro, Pablo Arrabal, Dickinson, Mark, Ferguson, Henry C., Kartaltepe, Jeyhan S., Papovich, Casey, Burgarella, Denis, Kocevski, Dale D., Huertas-Company, Marc, Iyer, Kartheik G., Koekemoer, Anton M., Larson, Rebecca L., Perez-Gonzalez, Pablo G., Rose, Caitlin, Tacchella, Sandro, Wilkins, Stephen M., Chworowsky, Katherine, Medrano, Aubrey, Morales, Alexa M., Somerville, Rachel S., Yung, L. Y. Aaron, Fontana, Adriano, Giavalisco, Mauro, Grazian, Andrea, Grogin, Norman A., Kewley, Lisa J., Kirkpatrick, Allison, Kurczynski, Peter, Lotz, Jennifer M., Pentericci, Laura, Pirzkal, Nor, Ravindranath, Swara, Ryan, Russell E., Jr., Trump, Jonathan R., Yang, Guang, Almaini, Omar, Amorin, Ricardo O., Annunziatella, Marianna, Backhaus, Bren E., Barro, Guillermo, Behroozi, Peter, Bell, Eric F., Bhatawdekar, Rachana, Bisigello, Laura, Bromm, Volker, Buat, Veronique, Buitrago, Fernando, Calabro, Antonello, Casey, Caitlin M., Castellano, Marco, Ortiz, Oscar A. Chavez, Ciesla, Laure, Cleri, Nikko J., Cohen, Seth H., Cole, Justin W., Cooke, Kevin C., Cooper, M. C., Cooray, Asantha R., Costantin, Luca, Cox, Isabella G., Croton, Darren, Daddi, Emanuele, Dave, Romeel, de la Vega, Alexander, Dekel, Avishai, Elbaz, David, Estrada-Carpenter, Vicente, Faber, Sandra M., Fernandez, Vital, Finkelstein, Keely D., Freundlich, Jonathan, Fujimoto, Seiji, Garcia-Argumanez, Angela, Gardner, Jonathan P., Gawiser, Eric, Gomez-Guijarro, Carlos, Guo, Yuchen, Hamblin, Kurt, Hamilton, Timothy S., Hathi, Nimish P., Holwerda, Benne W., Hirschmann, Michaela, Hutchison, Taylor A., Jaskot, Anne E., Jha, Saurabh W., Jogee, Shardha, Juneau, Stephanie, Jung, Intae, Kassin, Susan A., Le Bail, Aurelien, Leung, Gene C. K., Lucas, Ray A., Magnelli, Benjamin, Mantha, Kameswara Bharadwaj, Matharu, Jasleen, McGrath, Elizabeth J., McIntosh, Daniel H., Merlin, Emiliano, Mobasher, Bahram, Newman, Jeffrey A., Nicholls, David C., Pandya, Viraj, Rafelski, Marc, Ronayne, Kaila, Santini, Paola, Seille, Lise-Marie, Shah, Ekta A., Shen, Lu, Simons, Raymond C., Snyder, Gregory F., Stanway, Elizabeth R., Straughn, Amber N., Teplitz, Harry, I, Vanderhoof, Brittany N., Vega-Ferrero, Jesus, Wang, Weichen, Weiner, Benjamin J., Willmer, Christopher N. A., Wuyts, Stijn, and Zavala, Jorge A.

Subjects
epoch simulations flares, semianalytic forecasts, space-telescope, 1st galaxies, star-formation histories, light-cones, mass, luminosity function, l-dwarf, stellar
Abstract

We report the discovery of a candidate galaxy with a photo -z of z similar to 12 in the first epoch of the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey. Following conservative selection criteria, we identify a source with a robust zphot = 11.8(+0.3) (-0.2) (1 sigma uncertainty) with m(F200W) = 27.3 and > 7 sigma detections in five filters. The source is not detected at lambda < 1.4 mu m in deep imaging from both Hubble Space Telescope (HST) and JWST and has faint similar to 3 sigma detections in JWST F150W and HST F160W, which signal a Ly alpha break near the red edge of both filters, implying z similar to 12. This object (Maisie's Galaxy) exhibits F115W - F200W > 1.9 mag (2 sigma lower limit) with a blue continuum slope, resulting in 99.6% of the photo-z probability distribution function favoring z > 11. All data-quality images show no artifacts at the candidate's position, and independent analyses consistently find a strong preference for z > 11. Its colors are inconsistent with Galactic stars, and it is resolved (r(h) = 340 +/- 14 pc). Maisie's Galaxy has log M-*/M-?similar to 8.5 and is highly star-forming (log sSFR similar to -8.2 yr(-1)), with a blue rest-UV color (beta similar to -2.5) indicating little dust, though not extremely low metallicity. While the presence of this source is in tension with most predictions, it agrees with empirical extrapolations assuming UV luminosity functions that smoothly decline with increasing redshift. Should follow-up spectroscopy validate this redshift, our universe was already aglow with galaxies less than 400 Myr after the Big Bang.

225. UVUDF: Ultraviolet Imaging of the Hubble Ultra Deep Field with Wide-Field Camera 3

Author

Teplitz, Harry I., Rafelski, Marc, Kurczynski, Peter, Bond, Nicholas A., Soto, Emmaris, Grogin, Norman A., Koekemoer, Anton M., Atek, Hakim, Thomas Brown, Coe, Dan A., Colbert, James W., Dai, Yu Sophia, Ferguson, Henry Closson, Finkelstein, Steven L., Gardner, Jonathan P., Gawiser, Eric J., Giavalisco, Mauro, Gronwall, Caryl, Hanish, Daniel, Lee, Kyoung-Soo, Levay, Zoltan G., Mello, Duilia F., Ravindranath, Swara, Ryan, Russell E., Siana, Brian D., Scarlata, Claudia, Voyer, Elysse, and Windhorst, Rogier A.

226. The Detailed Science Case for the Maunakea Spectroscopic Explorer: the Composition and Dynamics of the Faint Universe

Author

Mcconnachie, Alan, Babusiaux, Carine, Balogh, Michael, Driver, Simon, Côté, Pat, Courtois, Helene, Davies, Luke, Ferrarese, Laura, Gallagher, Sarah, Ibata, Rodrigo, Martin, Nicolas, Robotham, Aaron, Venn, Kim, Villaver, Eva, Bovy, Jo, Boselli, Alessandro, Colless, Matthew, Comparat, Johan, Denny, Kelly, Duc, Pierre-Alain, Ellison, Sara, Grijs, Richard, Fernandez-Lorenzo, Mirian, Freeman, Ken, Guhathakurta, Raja, Hall, Patrick, Hopkins, Andrew, Hudson, Mike, Johnson, Andrew, Kaiser, Nick, Koda, Jun, Konstantopoulos, Iraklis, Koshy, George, Lee, Khee-Gan, Nusser, Adi, Pancoast, Anna, Peng, Eric, Peroux, Celine, Petitjean, Patrick, Pichon, Christophe, Poggianti, Bianca, Schmid, Carlo, Shastri, Prajval, Shen, Yue, Willot, Chris, Croom, Scott, Lallement, Rosine, Schimd, Carlo, Smith, Dan, Walker, Matthew, Willis, Jon, Colless, Alessandro Bosselli Matthew, Goswami, Aruna, Jarvis, Matt, Jullo, Eric, Kneib, Jean-Paul, Konstantopoloulous, Iraklis, Newman, Jeff, Richard, Johan, Sutaria, Firoza, Taylor, Edwar, Waerbeke, Ludovic, Battaglia, Giuseppina, Hall, Pat, Haywood, Misha, Sakari, Charli, Seibert, Arnaud, Thirupathi, Sivarani, Wang, Yuting, Wang, Yiping, Babas, Ferdinand, Bauman, Steve, Caffau, Elisabetta, Laychak, Mary Beth, Crampton, David, Devost, Daniel, Flagey, Nicolas, Han, Zhanwen, Higgs, Clare, Hill, Vanessa, Ho, Kevin, Isani, Sidik, Mignot, Shan, Murowinski, Rick, Pandey, Gajendra, Salmon, Derrick, Siebert, Arnaud, Simons, Doug, Starkenburg, Else, Szeto, Kei, Tully, Brent, Vermeulen, Tom, Withington, Kanoa, Arimoto, Nobuo, Asplund, Martin, Aussel, Herve, Bannister, Michele, Bhatt, Harish, Bhargavi, Ss, Blakeslee, John, Bland-Hawthorn, Joss, Bullock, James, Burgarella, Denis, Chang, Tzu-Ching, Cole, Andrew, Cooke, Jeff, Cooper, Andrew, Di Matteo, Paola, Favole, Ginevra, Flores, Hector, Gaensler, Bryan, Garnavich, Peter, Karoline Gilbert, Gonzalez-Delgado, Rosa, Guhathakurta, Puragra, Hasinger, Guenther, Herwig, Falk, Hwang, Narae, Jablonka, Pascale, Jarvis, Matthew, Kamath, Umanath, Kewley, Lisa, Le Borgne, Damien, Lewis, Geraint, Lupton, Robert, Martell, Sarah, Mateo, Mario, Mena, Olga, Nataf, David, Newman, Jeffrey, Pérez, Enrique, Prada, Francisco, Puech, Mathieu, Recio-Blanco, Alejandra, Robin, Annie, Saunders, Will, Smith, Daniel, Stalin, C. S., Tao, Charling, Thanjuvur, Karun, Tresse, Laurence, Waerbeke, Ludo, Wang, Jian-Min, Yong, David, Zhao, Gongbo, Boisse, Patrick, Bolton, James, Bonifacio, Piercarlo, Bouchy, Francois, Cowie, Len, Cunha, Katia, Deleuil, Magali, Mooij, Ernst, Dufour, Patrick, Foucaud, Sebastien, Glazebrook, Karl, Hutchings, John, Kobayashi, Chiaki, Kudritzki, Rolf-Peter, Li, Yang-Shyang, Lin, Lihwai, Lin, Yen-Ting, Makler, Martin, Narita, Norio, Park, Changbom, Ransom, Ryan, Ravindranath, Swara, Eswar Reddy, Bacham, Sawicki, Marcin, Simard, Luc, Srianand, Raghunathan, Storchi-Bergmann, Thaisa, Umetsu, Keiichi, Wang, Ting-Gui, Woo, Jong-Hak, Wu, Xue-Bing, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), NRC Herzberg Institute of Astrophysics, National Research Council of Canada (NRC), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Departamento de FisicaTeorica e IFT-UAM/CSIC, Universidad Autónoma de Madrid (UAM), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Cornell Lab of Ornithology, Cornell University [New York], Recherches Epistémologiques et Historiques sur les Sciences Exactes et les Institutions Scientifiques (REHSEIS (UMR_7596)), Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of Edinburgh, Galaxies, Etoiles, Physique, Instrumentation (GEPI), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), CSIRO Digital Productivity Flagship, Public Health Agency of Canada, Laboratoire d'Astrophysique de Toulouse-Tarbes, École normale supérieure - Lyon (ENS Lyon)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Department of Electrical and Computer Engineering [Minneapolis] (ECE), University of Minnesota [Twin Cities] (UMN), University of Minnesota System-University of Minnesota System, Herzberg Institute of Astrophysics, Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Department of electronic engineering, Chang Gung University, Canada-France-Hawaii Telescope Corporation (CFHT), National Research Council of Canada (NRC)-Centre National de la Recherche Scientifique (CNRS)-University of Hawai'i [Honolulu] (UH), Anglo-Australian Observatory (AAO), AUTRES, Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Instituto de Astrofísica de Andalucía (IAA), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Cosmological Impact of the First Stars (CIFIST), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Département de médecine oncologique, CRLCC Paul Strauss, Centre for Astrophysics and Supercomputing [Swinburne] (CAS), Swinburne University of Technology [Melbourne], Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Department of Chemical and Biomolecular Engineering, School of Physics, Korea Institute for Advanced Study (KIAS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Études des Structures, des Processus d’Adaptation et des Changements de l’Espace (ESPACE), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Avignon Université (AU)-Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Universidad Autonoma de Madrid (UAM), Cornell University, Recherches Epistémologiques et Historiques sur les Sciences Exactes et les Institutions Scientifiques (REHSEIS), PSL Research University (PSL)-PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), University of Minnesota [Twin Cities], Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Consejo Superior de Investigaciones Científicas [Spain] (CSIC)-Universitat de València (UV), Consejo Superior de Investigaciones Científicas [Spain] (CSIC), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), PSL Research University (PSL)-PSL Research University (PSL), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Cornell Laboratory of Ornithology, Laboratoire Astrophysique de Toulouse-Tarbes (LATT), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), and Cornell Lab of Ornithology [New York]

Subjects
[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Astrophysics of Galaxies (astro-ph.GA), Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Astrophysics of Galaxies, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics::Galaxy Astrophysics
Abstract

MSE is an 11.25m aperture observatory with a 1.5 square degree field of view that will be fully dedicated to multi-object spectroscopy. More than 3200 fibres will feed spectrographs operating at low (R ~ 2000 - 3500) and moderate (R ~ 6000) spectral resolution, and approximately 1000 fibers will feed spectrographs operating at high (R ~ 40000) resolution. MSE is designed to enable transformational science in areas as diverse as tomographic mapping of the interstellar and intergalactic media; the in-situ chemical tagging of thick disk and halo stars; connecting galaxies to their large scale structure; measuring the mass functions of cold dark matter sub-halos in galaxy and cluster-scale hosts; reverberation mapping of supermassive black holes in quasars; next generation cosmological surveys using redshift space distortions and peculiar velocities. MSE is an essential follow-up facility to current and next generations of multi-wavelength imaging surveys, including LSST, Gaia, Euclid, WFIRST, PLATO, and the SKA, and is designed to complement and go beyond the science goals of other planned and current spectroscopic capabilities like VISTA/4MOST, WHT/WEAVE, AAT/HERMES and Subaru/PFS. It is an ideal feeder facility for E-ELT, TMT and GMT, and provides the missing link between wide field imaging and small field precision astronomy. MSE is optimized for high throughput, high signal-to-noise observations of the faintest sources in the Universe with high quality calibration and stability being ensured through the dedicated operational mode of the observatory. (abridged), Comment: 210 pages, 91 figures. Exposure draft. Appendices to the Detailed Science Case can be found at http://mse.cfht.hawaii.edu/docs/

228. Pandeia: a multi-mission exposure time calculator for JWST and WFIRST

Author

Peck, Alison B., Seaman, Robert L., Benn, Chris R., Pontoppidan, Klaus M., Pickering, Timothy E., Laidler, Victoria G., Gilbert, Karoline, Sontag, Christopher D., Slocum, Christine, Sienkiewicz, Mark J., Hanley, Christopher, Earl, Nicholas M., Pueyo, Laurent, Ravindranath, Swara, Karakla, Diane M., Robberto, Massimo, Noriega-Crespo, Alberto, and Barker, Elizabeth A.

Published
2016
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229. CLUMPY GALAXIES IN CANDELS. I. THE DEFINITION OF UV CLUMPS AND THE FRACTION OF CLUMPY GALAXIES AT 0.5 < z < 3.

Author

Guo, Yicheng, Ferguson, Henry C., Bell, Eric F., Koo, David C., Conselice, Christopher J., Giavalisco, Mauro, Kassin, Susan, Lu, Yu, Lucas, Ray, Mandelker, Nir, McIntosh, Daniel M., Primack, Joel R., Ravindranath, Swara, Barro, Guillermo, Ceverino, Daniel, Dekel, Avishai, Faber, Sandra M., Fang, Jerome J., Koekemoer, Anton M., and Noeske, Kai

Subjects
STARS, GALAXY formation, GALACTIC evolution, ULTRAVIOLET radiation, SPIRAL galaxies
Abstract

Although giant clumps of stars are thought to be crucial to galaxy formation and evolution, the most basic demographics of clumps are still uncertain, mainly because the definition of clumps has not been thoroughly discussed. In this paper, we carry out a study of the basic demographics of clumps in star-forming galaxies at 0.5 < z < 3, using our proposed physical definition that UV-bright clumps are discrete star-forming regions that individually contribute more than 8% of the rest-frame UV light of their galaxies. Clumps defined this way are significantly brighter than the H II regions of nearby large spiral galaxies, either individually or blended, when physical spatial resolution and cosmological dimming are considered. Under this definition, we measure the fraction of star-forming galaxies that have at least one off-center clump (fclumpy) and the contributions of clumps to the rest-frame UV light and star formation rate (SFR) of star-forming galaxies in the CANDELS/GOODS-S and UDS fields, where our mass-complete sample consists of 3239 galaxies with axial ratio q > 0.5. The redshift evolution of fclumpy changes with the stellar mass (M*) of the galaxies. Low-mass (log (M*/M☼) < 9.8) galaxies keep an almost constant fclumpy of ∼60% from z ∼ 3 to z ∼ 0.5. Intermediate-mass and massive galaxies drop their fclumpy from 55% at z ∼ 3 to 40% and 15%, respectively, at z ∼ 0.5. We find that (1) the trend of disk stabilization predicted by violent disk instability matches the fclumpy trend of massive galaxies; (2) minor mergers are a viable explanation of the fclumpy trend of intermediate-mass galaxies at z < 1.5, given a realistic observability timescale; and (3) major mergers are unlikely responsible for the fclumpy trend in all masses at z < 1.5. The clump contribution to the rest-frame UV light of star-forming galaxies shows a broad peak around galaxies with log (M*/M☼) ∼ 10.5 at all redshifts. The clump contribution in the intermediate-mass and massive galaxies is possibly linked to the molecular gas fraction of the galaxies. The clump contribution to the SFR of star-forming galaxies, generally around 4%-10%, also shows dependence on the galaxy M*, but for a given galaxy M*, its dependence on the redshift is mild. [ABSTRACT FROM AUTHOR]

Published
2015
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231. Observational Constraints on Galaxy Evolution from Multi-Wavelength Surveys

Author

Ravindranath, Swara

Abstract

The multiwavelength databases that result from deep sky surveys are powerful tools for addressing issues related to galaxy formation and evolution. These data provide important insights into galaxy assembly, star formation history, nuclear activity, and role of galaxy environments. Here, I focus on some of the recent results on the evolution of galaxy morphology and sizes, tracing back to the epoch when the Universe was only less than 10% of its present age.

Published
2013
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232. CEERS Key Paper. II. A First Look at the Resolved Host Properties of AGN at 3 < z < 5 with JWST

Author

Dale D. Kocevski, Guillermo Barro, Elizabeth J. McGrath, Steven L. Finkelstein, Micaela B. Bagley, Henry C. Ferguson, Shardha Jogee, Guang Yang, Mark Dickinson, Nimish P. Hathi, Bren E. Backhaus, Eric F. Bell, Laura Bisigello, Véronique Buat, Denis Burgarella, Caitlin M. Casey, Nikko J. Cleri, M. C. Cooper, Luca Costantin, Darren Croton, Emanuele Daddi, Adriano Fontana, Seiji Fujimoto, Jonathan P. Gardner, Eric Gawiser, Mauro Giavalisco, Andrea Grazian, Norman A. Grogin, Yuchen Guo, Pablo Arrabal Haro, Michaela Hirschmann, Benne W. Holwerda, Marc Huertas-Company, Taylor A. Hutchison, Kartheik G. Iyer, Brenda Jones, Stéphanie Juneau, Jeyhan S. Kartaltepe, Lisa J. Kewley, Allison Kirkpatrick, Anton M. Koekemoer, Peter Kurczynski, Aurélien Le Bail, Arianna S. Long, Jennifer M. Lotz, Ray A. Lucas, Casey Papovich, Laura Pentericci, Pablo G. Pérez-González, Nor Pirzkal, Marc Rafelski, Swara Ravindranath, Rachel S. Somerville, Amber N. Straughn, Sandro Tacchella, Jonathan R. Trump, Stephen M. Wilkins, Stijn Wuyts, L. Y. Aaron Yung, Jorge A. Zavala, Kocevski, DD [0000-0002-8360-3880], Barro, G [0000-0002-0786-7307], McGrath, EJ [0000-0001-8688-2443], Finkelstein, SL [0000-0001-8519-1130], Bagley, MB [0000-0002-9921-9218], Ferguson, HC [0000-0001-7113-2738], Jogee, S [0000-0002-1590-0568], Yang, G [0000-0001-8835-7722], Dickinson, M [0000-0001-5414-5131], Hathi, NP [0000-0001-6145-5090], Backhaus, BE [0000-0001-8534-7502], Bell, EF [0000-0002-5564-9873], Bisigello, L [0000-0003-0492-4924], Buat, V [0000-0003-3441-903X], Burgarella, D [0000-0002-4193-2539], Casey, CM [0000-0002-0930-6466], Cleri, NJ [0000-0001-7151-009X], Cooper, MC [0000-0003-1371-6019], Costantin, L [0000-0001-6820-0015], Croton, D [0000-0002-5009-512X], Daddi, E [0000-0002-3331-9590], Fontana, A [0000-0003-3820-2823], Fujimoto, S [0000-0001-7201-5066], Gardner, JP [0000-0003-2098-9568], Gawiser, E [0000-0003-1530-8713], Giavalisco, M [0000-0002-7831-8751], Grazian, A [0000-0002-5688-0663], Grogin, NA [0000-0001-9440-8872], Guo, Y [0000-0002-4162-6523], Haro, PA [0000-0002-7959-8783], Hirschmann, M [0000-0002-3301-3321], Holwerda, BW [0000-0002-4884-6756], Huertas-Company, M [0000-0002-1416-8483], Hutchison, TA [0000-0001-6251-4988], Iyer, KG [0000-0001-9298-3523], Juneau, S [0000-0002-0000-2394], Kartaltepe, JS [0000-0001-9187-3605], Kewley, LJ [0000-0001-8152-3943], Kirkpatrick, A [0000-0002-1306-1545], Koekemoer, AM [0000-0002-6610-2048], Kurczynski, P [0000-0002-8816-5146], Bail, AL [0000-0002-9466-2763], Long, AS [0000-0002-7530-8857], Lotz, JM [0000-0003-3130-5643], Lucas, RA [0000-0003-1581-7825], Papovich, C [0000-0001-7503-8482], Pentericci, L [0000-0001-8940-6768], Pérez-González, PG [0000-0003-4528-5639], Pirzkal, N [0000-0003-3382-5941], Rafelski, M [0000-0002-9946-4731], Ravindranath, S [0000-0002-5269-6527], Somerville, RS [0000-0002-6748-6821], Straughn, AN [0000-0002-4772-7878], Tacchella, S [0000-0002-8224-4505], Trump, JR [0000-0002-1410-0470], Wilkins, SM [0000-0003-3903-6935], Wuyts, S [0000-0003-3735-1931], Aaron Yung, LY [0000-0003-3466-035X], Zavala, JA [0000-0002-7051-1100], Apollo - University of Cambridge Repository, Kocevski, Dale D [0000-0002-8360-3880], Barro, Guillermo [0000-0002-0786-7307], McGrath, Elizabeth J [0000-0001-8688-2443], Finkelstein, Steven L [0000-0001-8519-1130], Bagley, Micaela B [0000-0002-9921-9218], Ferguson, Henry C [0000-0001-7113-2738], Jogee, Shardha [0000-0002-1590-0568], Yang, Guang [0000-0001-8835-7722], Dickinson, Mark [0000-0001-5414-5131], Hathi, Nimish P [0000-0001-6145-5090], Backhaus, Bren E [0000-0001-8534-7502], Bell, Eric F [0000-0002-5564-9873], Bisigello, Laura [0000-0003-0492-4924], Buat, Véronique [0000-0003-3441-903X], Burgarella, Denis [0000-0002-4193-2539], Casey, Caitlin M [0000-0002-0930-6466], Cleri, Nikko J [0000-0001-7151-009X], Costantin, Luca [0000-0001-6820-0015], Croton, Darren [0000-0002-5009-512X], Daddi, Emanuele [0000-0002-3331-9590], Fontana, Adriano [0000-0003-3820-2823], Fujimoto, Seiji [0000-0001-7201-5066], Gardner, Jonathan P [0000-0003-2098-9568], Gawiser, Eric [0000-0003-1530-8713], Giavalisco, Mauro [0000-0002-7831-8751], Grazian, Andrea [0000-0002-5688-0663], Grogin, Norman A [0000-0001-9440-8872], Guo, Yuchen [0000-0002-4162-6523], Haro, Pablo Arrabal [0000-0002-7959-8783], Hirschmann, Michaela [0000-0002-3301-3321], Holwerda, Benne W [0000-0002-4884-6756], Huertas-Company, Marc [0000-0002-1416-8483], Hutchison, Taylor A [0000-0001-6251-4988], Iyer, Kartheik G [0000-0001-9298-3523], Juneau, Stéphanie [0000-0002-0000-2394], Kartaltepe, Jeyhan S [0000-0001-9187-3605], Kewley, Lisa J [0000-0001-8152-3943], Kirkpatrick, Allison [0000-0002-1306-1545], Koekemoer, Anton M [0000-0002-6610-2048], Kurczynski, Peter [0000-0002-8816-5146], Bail, Aurélien Le [0000-0002-9466-2763], Long, Arianna S [0000-0002-7530-8857], Lotz, Jennifer M [0000-0003-3130-5643], Lucas, Ray A [0000-0003-1581-7825], Papovich, Casey [0000-0001-7503-8482], Pentericci, Laura [0000-0001-8940-6768], Pérez-González, Pablo G [0000-0003-4528-5639], Pirzkal, Nor [0000-0003-3382-5941], Rafelski, Marc [0000-0002-9946-4731], Ravindranath, Swara [0000-0002-5269-6527], Somerville, Rachel S [0000-0002-6748-6821], Straughn, Amber N [0000-0002-4772-7878], Tacchella, Sandro [0000-0002-8224-4505], Trump, Jonathan R [0000-0002-1410-0470], Wilkins, Stephen M [0000-0003-3903-6935], Wuyts, Stijn [0000-0003-3735-1931], and Zavala, Jorge A [0000-0002-7051-1100]

Subjects
Space and Planetary Science, 5101 Astronomical Sciences, Astronomy and Astrophysics, 51 Physical Sciences, Galaxies and Cosmology
Abstract

We report on the host properties of five X-ray-luminous active galactic nuclei (AGN) identified at 3 < z < 5 in the first epoch of imaging from the Cosmic Evolution Early Release Science Survey. Each galaxy has been imaged with the JWST Near-Infrared Camera, which provides rest-frame optical morphologies at these redshifts. We also derive stellar masses and star formation rates for each host by fitting its spectral energy distribution using a combination of galaxy and AGN templates. We find that three of the AGN hosts have spheroidal morphologies, one is a bulge-dominated disk, and one is dominated by pointlike emission. None are found to show strong morphological disturbances that might indicate a recent interaction or merger event. When compared to a sample of mass-matched inactive galaxies, we find that the AGN hosts have morphologies that are less disturbed and more bulge-dominated. Notably, all four of the resolved hosts have rest-frame optical colors consistent with a quenched or poststarburst stellar population. The presence of AGN in passively evolving galaxies at z > 3 is significant because a rapid feedback mechanism is required in most semianalytic models and cosmological simulations to explain the growing population of massive quiescent galaxies observed at these redshifts. Our findings show that AGN can continue to inject energy into these systems after their star formation is curtailed, potentially heating their halos and preventing renewed star formation. Additional observations will be needed to determine what role this feedback may play in helping to quench these systems and/or maintain their quiescent state.

Published
2023
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235. Formation of a low-mass galaxy from star clusters in a 600-million-year-old Universe.

Author

Mowla L, Iyer K, Asada Y, Desprez G, Tan VYY, Martis N, Sarrouh G, Strait V, Abraham R, Bradač M, Brammer G, Muzzin A, Pacifici C, Ravindranath S, Sawicki M, Willott C, Estrada-Carpenter V, Jahan N, Noirot G, Matharu J, Rihtaršič G, and Zabl J

Abstract

The most distant galaxies detected were seen when the Universe was a scant 5% of its current age. At these times, progenitors of galaxies such as the Milky Way were about 10,000 times less massive. Using the James Webb Space Telescope (JWST) combined with magnification from gravitational lensing, these low-mass galaxies can not only be detected but also be studied in detail. Here we present JWST observations of a strongly lensed galaxy at z spec  = 8.296 ± 0.001, showing massive star clusters (the Firefly Sparkle) cocooned in a diffuse arc in the Canadian Unbiased Cluster Survey (CANUCS) 1 . The Firefly Sparkle exhibits traits of a young, gas-rich galaxy in its early formation stage. The mass of the galaxy is concentrated in 10 star clusters (49-57% of total mass), with individual masses ranging from 10 5 M ⊙ to 10 6 M ⊙ . These unresolved clusters have high surface densities (>10 3 M ⊙  pc - 2 ), exceeding those of Milky Way globular clusters and young star clusters in nearby galaxies. The central cluster shows a nebular-dominated spectrum, low metallicity, high gas density and high electron temperature, hinting at a top-heavy initial mass function. These observations provide our first spectrophotometric view of a typical galaxy in its early stages, in a 600-million-year-old Universe., Competing Interests: Competing interests: The authors declare no competing interests., (© 2024. The Author(s), under exclusive licence to Springer Nature Limited.)

Published
2024
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