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101. Hubble Space Telescope Imaging of the Poststarburst Quasar UN J1025-0040: Evidence for Recent Star Formation

Author

Brotherton, Michael S., Grabelsky, Matthew, Canalizo, Gabriela, van, Wil, Filippenko, Alexei V., Croom, Scott, Boyle, Brian, and Shanks, Tom

Abstract

We present new Hubble Space Telescope (HST) Wide Field Planetary Camera images of the poststarburst quasar UN J1025-0040, which contains both an active galactic nucleus (AGN) and a 400 Myr old nuclear starburst of similar bolometric luminosity ([?]1011.6 ). The F450W and F814W images resolve the AGN from the starburst and show that the bulk of the starlight ([?]6 x 1010) is contained within a central radius of about 600 pc and lacks clear morphological structures at this scale. Equating the point-source light in each image with the AGN contribution, we determined the ratio of AGN-to-starburst light. This ratio is 69% in the red F814W image, consistent with our previous spectral analysis, but [?]50% in the blue F450W image, whereas we had predicted 76%. The HST images are consistent with previous photometry, ruling out variability (a fading AGN) as a cause for this result. We can explain the new data if there is a previously unknown young stellar population present, 40 Myr or younger, with as much as 10% of the mass of the dominant 400 Myr old population. This younger starburst may represent the trigger for the current nuclear activity. The multiple starburst ages seen in UN J1025-0040 and its companion galaxy indicate a complex interaction and star formation history.

Published
2002

102. 4MOST Consortium Survey 6: Active Galactic Nuclei

Author

Merloni, Andrea, Alexander, David A., Banerji, Manda, Boller, Thomas, Comparat, Johan, Dwelly, Tom, Fotopoulou, Sotiria, McMahon, Richard, Nandra, Kirpal, Salvato, Mara, Croom, Scott, Finoguenov, Alexis, Krumpe, Mirko, Lamer, Georg, Rosario, David, Schwope, Axel, Shanks, Tom, Steinmetz, Matthias, Wisotzki, Lutz, and Worseck, Gabor

Subjects
010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 010303 astronomy & astrophysics, 01 natural sciences, Astrophysics::Galaxy Astrophysics
Abstract

X-ray and mid-infrared emission are signposts of the accretion of matter onto the supermassive black holes that reside at the centres of most galaxies. As a major step towards understanding accreting supermassive black holes and their role in the evolution of galaxies, we will use the 4MOST multi-object spectrograph to provide a highly complete census of active galactic nuclei over a large fraction of the extragalactic sky observed in X-rays by eROSITA that is visible to 4MOST. We will systematically follow up all eROSITA point-like extragalactic X-ray sources (mostly active galactic nuclei), and complement them with a heavily obscured active galactic nuclei selection approach using mid-infrared data from the Wide-field Infrared Survey Explorer (WISE). The X-ray and mid-infrared flux limits of eROSITA and WISE are well matched to the spectroscopic capabilities of a 4-metre-class telescope, allowing us to reach completeness levels of ~ 80–90% for all X-ray selected active galactic nuclei with fluxes f0.5–2 keV > 10–14 erg s–1 cm–2; this is about a factor of 30 deeper than the ROSAT all-sky survey. With these data we will determine the physical properties (redshift, luminosity, line emission strength, masses, etc.) of up to one million supermassive black holes, constrain their cosmic evolution and clustering properties, and explore the connection between active galactic nuclei and large-scale structure over redshifts 0 ≲ z ≲ 6., Published in The Messenger vol. 175, pp. 42-45, March 2019.

103. 4MOST: Project overview and information for the First Call for Proposals

Author

De Jong, Roelof S., Agertz, Oscar, Berbel, Alex Agudo, Aird, James, Alexander, David A., Amarsi, Anish, Anders, Friedrich, Andrae, Rene, Ansarinejad, Behzad, Ansorge, Wolfgang, Antilogus, Pierre, Anwand-Heerwart, Heiko, Arentsen, Anke, Arnadottir, Anna, Asplund, Martin, Auger, Matt, Azais, Nicolas, Baade, Dietrich, Baker, Gabriella, Baker, Sufyan, Balbinot, Eduardo, Baldry, Ivan K., Banerji, Manda, Barden, Samuel, Barklem, Paul, Barthélémy-Mazot, Eléonore, Battistini, Chiara, Bauer, Svend, Bell, Cameron P. M., Bellido-Tirado, Olga, Bellstedt, Sabine, Belokurov, Vasily, Bensby, Thomas, Bergemann, Maria, Bestenlehner, Joachim M., Bielby, Richard, Bilicki, Maciej, Blake, Chris, Bland-Hawthorn, Joss, Boeche, Corrado, Boland, Wilfried, Boller, Thomas, Bongard, Sebastien, Bongiorno, Angela, Bonifacio, Piercarlo, Boudon, Didier, Brooks, David, Brown, Michael J. I., Brown, Rebecca, Brüggen, Marcus, Brynnel, Joar, Brzeski, Jurek, Buchert, Thomas, Buschkamp, Peter, Caffau, Elisabetta, Caillier, Patrick, Carrick, Jonathan, Casagrande, Luca, Case, Scott, Casey, Andrew, Cesarini, Isabella, Cescutti, Gabriele, Chapuis, Diane, Chiappini, Cristina, Childress, Michael, Christlieb, Norbert, Church, Ross, Cioni, Maria-Rosa L., Cluver, Michelle, Colless, Matthew, Collett, Thomas, Comparat, Johan, Cooper, Andrew, Couch, Warrick, Courbin, Frederic, Croom, Scott, Croton, Darren, Daguisé, Eric, Dalton, Gavin, Davies, Luke J. M., Davis, Tamara, De Laverny, Patrick, Deason, Alis, Dionies, Frank, Disseau, Karen, Doel, Peter, Döscher, Daniel, Driver, Simon P., Dwelly, Tom, Eckert, Dominique, Edge, Alastair, Edvardsson, Bengt, Youssoufi, Dalal El, Elhaddad, Ahmed, Enke, Harry, Erfanianfar, Ghazaleh, Farrell, Tony, Fechner, Thomas, Feiz, Carmen, Feltzing, Sofia, Ferreras, Ignacio, Feuerstein, Dietrich, Feuillet, Diane, Finoguenov, Alexis, Ford, Dominic, Fotopoulou, Sotiria, Fouesneau, Morgan, Frenk, Carlos, Frey, Steffen, Gaessler, Wolfgang, Geier, Stephan, Fusillo, Nicola Gentile, Gerhard, Ortwin, Giannantonio, Tommaso, Giannone, Domenico, Gibson, Brad, Gillingham, Peter, González-Fernández, Carlos, Gonzalez-Solares, Eduardo, Gottloeber, Stefan, Gould, Andrew, Grebel, Eva K., Gueguen, Alain, Guiglion, Guillaume, Haehnelt, Martin, Hahn, Thomas, Hansen, Camilla J., Hartman, Henrik, Hauptner, Katja, Hawkins, Keith, Haynes, Dionne, Haynes, Roger, Heiter, Ulrike, Helmi, Amina, Aguayo, Cesar Hernandez, Hewett, Paul, Hinton, Samuel, Hobbs, David, Hoenig, Sebastian, Hofman, David, Hook, Isobel, Hopgood, Joshua, Hopkins, Andrew, Hourihane, Anna, Howes, Louise, Howlett, Cullan, Huet, Tristan, Irwin, Mike, Iwert, Olaf, Jablonka, Pascale, Jahn, Thomas, Jahnke, Knud, Jarno, Aurélien, Jin, Shoko, Jofre, Paula, Johl, Diana, Jones, Damien, Jönsson, Henrik, Jordan, Carola, Karovicova, Iva, Khalatyan, Arman, Kelz, Andreas, Kennicutt, Robert, King, David, Kitaura, Francisco, Klar, Jochen, Klauser, Urs, Kneib, Jean-Paul, Koch, Andreas, Koposov, Sergey, Kordopatis, Georges, Korn, Andreas, Kosmalski, Johan, Kotak, Rubina, Kovalev, Mikhail, Kreckel, Kathryn, Kripak, Yevgen, Krumpe, Mirko, Kuijken, Koen, Kunder, Andrea, Kushniruk, Iryna, Lam, Man I, Lamer, Georg, Laurent, Florence, Lawrence, Jon, Lehmitz, Michael, Lemasle, Bertrand, Lewis, James, Li, Baojiu, Lidman, Chris, Lind, Karin, Liske, Jochen, Lizon, Jean-Louis, Loveday, Jon, Ludwig, Hans-Günter, McDermid, Richard M., Maguire, Kate, Mainieri, Vincenzo, Mali, Slavko, Mandel, Holger, Mandel, Kaisey, Mannering, Liz, Martell, Sarah, Delgado, David Martinez, Matijevic, Gal, McGregor, Helen, McMahon, Richard, McMillan, Paul, Mena, Olga, Merloni, Andrea, Meyer, Martin J., Michel, Christophe, Micheva, Genoveva, Migniau, Jean-Emmanuel, Minchev, Ivan, Monari, Giacomo, Muller, Rolf, Murphy, David, Muthukrishna, Daniel, Nandra, Kirpal, Navarro, Ramon, Ness, Melissa, Nichani, Vijay, Nichol, Robert, Nicklas, Harald, Niederhofer, Florian, Norberg, Peder, Obreschkow, Danail, Oliver, Seb, Owers, Matt, Pai, Naveen, Pankratow, Sergei, Parkinson, David, Paschke, Jens, Paterson, Robert, Pecontal, Arlette, Parry, Ian, Phillips, Dan, Pillepich, Annalisa, Pinard, Laurent, Pirard, Jeff, Piskunov, Nikolai, Plank, Volker, Plüschke, Dennis, Pons, Estelle, Popesso, Paola, Power, Chris, Pragt, Johan, Pramskiy, Alexander, Pryer, Dan, Quattri, Marco, Queiroz, Anna Barbara De Andrade, Quirrenbach, Andreas, Rahurkar, Swara, Raichoor, Anand, Ramstedt, Sofia, Rau, Arne, Recio-Blanco, Alejandra, Reiss, Roland, Renaud, Florent, Revaz, Yves, Rhode, Petra, Richard, Johan, Richter, Amon David, Rix, Hans-Walter, Robotham, Aaron S. G., Roelfsema, Ronald, Romaniello, Martino, Rosario, David, Rothmaier, Florian, Roukema, Boudewijn, Ruchti, Gregory, Rupprecht, Gero, Rybizki, Jan, Ryde, Nils, Saar, Andre, Sadler, Elaine, Sahlén, Martin, Salvato, Mara, Sassolas, Benoit, Saunders, Will, Saviauk, Allar, Sbordone, Luca, Schmidt, Thomas, Schnurr, Olivier, Scholz, Ralf-Dieter, Schwope, Axel, Seifert, Walter, Shanks, Tom, Sheinis, Andrew, Sivov, Tihomir, Skúladóttir, Ása, Smartt, Stephen, Smedley, Scott, Smith, Greg, Smith, Robert, Sorce, Jenny, Spitler, Lee, Starkenburg, Else, Steinmetz, Matthias, Stilz, Ingo, Storm, Jesper, Sullivan, Mark, Sutherland, William, Swann, Elizabeth, Tamone, Amélie, Taylor, Edward N., Teillon, Julien, Tempel, Elmo, Ter Horst, Rik, Thi, Wing-Fai, Tolstoy, Eline, Trager, Scott, Traven, Gregor, Tremblay, Pier-Emmanuel, Tresse, Laurence, Valentini, Marica, Van De Weygaert, Rien, Van Den Ancker, Mario, Veljanoski, Jovan, Venkatesan, Sudharshan, Wagner, Lukas, Wagner, Karl, Walcher, C. Jakob, Waller, Lew, Walton, Nicholas, Wang, Lingyu, Winkler, Roland, Wisotzki, Lutz, Worley, C. Clare, Worseck, Gabor, Xiang, Maosheng, Xu, Wenli, Yong, David, Zhao, Cheng, Zheng, Jessica, Zscheyge, Florian, and Zucker, Daniel

Subjects
010308 nuclear & particles physics, 0103 physical sciences, 010303 astronomy & astrophysics, 01 natural sciences
Abstract

We introduce the 4-metre Multi-Object Spectroscopic Telescope (4MOST), a new high-multiplex, wide-field spectroscopic survey facility under development for the four-metre-class Visible and Infrared Survey Telescope for Astronomy (VISTA) at Paranal. Its key specifications are: a large field of view (FoV) of 4.2 square degrees and a high multiplex capability, with 1624 fibres feeding two low-resolution spectrographs (R = λ/Δλ ~ 6500), and 812 fibres transferring light to the high-resolution spectrograph (R ~ 20 000). After a description of the instrument and its expected performance, a short overview is given of its operational scheme and planned 4MOST Consortium science; these aspects are covered in more detail in other articles in this edition of The Messenger. Finally, the processes, schedules, and policies concerning the selection of ESO Community Surveys are presented, commencing with a singular opportunity to submit Letters of Intent for Public Surveys during the first five years of 4MOST operations., Published in The Messenger vol. 175, pp. 3-11, March 2019.

104. 4MOST Consortium Survey 8: Cosmology Redshift Survey (CRS)

Author

Richard, Johan, Kneib, Jean-Paul, Blake, Chris, Raichoor, Anand, Comparat, Johan, Shanks, Tom, Sorce, Jenny, Sahlén, Martin, Howlett, Cullan, Tempel, Elmo, McMahon, Richard, Bilicki, Maciej, Roukema, Boudewijn, Loveday, Jon, Pryer, Dan, Buchert, Thomas, Zhao, Cheng, and Team, The CRS

Subjects
010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, 0103 physical sciences, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 010303 astronomy & astrophysics, 01 natural sciences, Astrophysics::Galaxy Astrophysics
Abstract

The 4MOST Cosmology Redshift Survey (CRS) will perform stringent cosmological tests via spectroscopic clustering measurements that will complement the best lensing, cosmic microwave background and other surveys in the southern hemisphere. The combination of carefully selected samples of bright galaxies, luminous red galaxies, emission-line galaxies and quasars, totalling about 8 million objects over the redshift range z = 0.15 to 3.5, will allow definitive tests of gravitational physics. Many key science questions will be addressed by combining CRS spectra of these targets with data from current or future facilities such as the Large Synoptic Survey Telescope, the Square Kilometre Array and the Euclid mission., Published in The Messenger vol. 175, pp. 50-53, March 2019.

105. That's not all, folks.

Author

Shanks, Tom

Subjects
*METAPHYSICAL cosmology, *RADIATION, *RADIO meteorology, *GALAXY clusters, *GLOBAL temperature changes, *ARTIFICIAL satellites
Abstract

Using a satellite called the Wilkinson Microwave Anisotropy Probe (WMAP) stationed millions of kilometres from the Earth, scientists built up the most detailed map of the sky to date, showing the temperature variations in microwave radiation from the young universe, as of February 2004. From this they extracted information about the cosmos that was far more precise and supportive of the standard model than anything seen before. According to the author, effective though the standard model is at explaining key observations, it still has a soft underbelly of assumptions. The WMAP team itself has reported microwave cooling close to the centres of galaxy clusters, and taken this into account. But the author's research detects microwave cooling so far out from cluster centres that it raises the possibility that even clouds of gas adrift in the space between galaxy clusters may distort the microwave background.

Published
2004

106. First discoveries of z > 6 quasars with the DECam Legacy Survey and UKIRT hemisphere survey

Author

Wang, Feige, Fan, Xiaohui, Yang, Jinyi, Wu, Xue-Bing, Yang, Qian, Bian, Fuyan, McGreer, Ian D., Li, Jiang-Tao, Li, Zefeng, Ding, Jiani, Dey, Arjun, Dye, S., Findlay, Joseph R., Green, Richard, James, David, Jiang, Linhua, Lang, Dustin, Lawrence, Andy, Myers, Adam D., Ross, Nicholas P., Schlegel, David J., Shanks, Tom, Wang, Feige, Fan, Xiaohui, Yang, Jinyi, Wu, Xue-Bing, Yang, Qian, Bian, Fuyan, McGreer, Ian D., Li, Jiang-Tao, Li, Zefeng, Ding, Jiani, Dey, Arjun, Dye, S., Findlay, Joseph R., Green, Richard, James, David, Jiang, Linhua, Lang, Dustin, Lawrence, Andy, Myers, Adam D., Ross, Nicholas P., Schlegel, David J., and Shanks, Tom

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107. Radio galaxies in the 2SLAQ Luminous Red Galaxy Survey - I. The evolution of low-power radio galaxies to z~ 0.7

Author

Sadler, Elaine M., Cannon, Russell D., Mauch, Tom, Hancock, Paul J., Wake, David A., Ross, Nic, Croom, Scott M., Drinkwater, Michael J., Edge, Alastair C., Eisenstein, Daniel, Hopkins, Andrew M., Johnston, Helen M., Nichol, Robert, Pimbblet, Kevin A., De Propris, Roberto, Roseboom, Isaac G., Schneider, Donald P., Shanks, Tom, Sadler, Elaine M., Cannon, Russell D., Mauch, Tom, Hancock, Paul J., Wake, David A., Ross, Nic, Croom, Scott M., Drinkwater, Michael J., Edge, Alastair C., Eisenstein, Daniel, Hopkins, Andrew M., Johnston, Helen M., Nichol, Robert, Pimbblet, Kevin A., De Propris, Roberto, Roseboom, Isaac G., Schneider, Donald P., and Shanks, Tom

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108. Calibrating photometric redshifts of luminous red galaxies

Author

Padmanabhan, Nikhil, Budavari, Tamás, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, István, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Roberto, Schneider, Donald P., Scranton, Ryan, Seljak, Uroš, Shanks, Tom, Szapudi, István, Szalay, Alexander S., Wake, David, Padmanabhan, Nikhil, Budavari, Tamás, Schlegel, David J., Bridges, Terry, Brinkmann, Jonathan, Cannon, Russell, Connolly, Andrew J., Croom, Scott M., Csabai, István, Drinkwater, Michael, Eisenstein, Daniel J., Hewett, Paul C., Loveday, Jon, Nichol, Robert C., Pimbblet, Kevin A., De Propris, Roberto, Schneider, Donald P., Scranton, Ryan, Seljak, Uroš, Shanks, Tom, Szapudi, István, Szalay, Alexander S., and Wake, David

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109. The 2dF–SDSS LRG and QSO survey: the QSO luminosity function at 0.4 < z < 2.6

Author

Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Strauss, Michael A., Myers, Adam D., Nichol, Robert C., Pimbblet, Kevin A., Ross, Nicholas P., Schneider, Donald P., Sharp, Robert G., Wake, David A., Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Strauss, Michael A., Myers, Adam D., Nichol, Robert C., Pimbblet, Kevin A., Ross, Nicholas P., Schneider, Donald P., Sharp, Robert G., and Wake, David A.

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110. The 2dF-SDSS LRG and QSO Survey: the star formation histories of luminous red galaxies

Author

Roseboom, Isaac G., Pimbblet, Kevin A., Drinkwater, Michael J., Cannon, Russell D., De Propris, Roberto, Edge, Alastair C., Eisenstein, Daniel J., Nichol, Robert C., Smail, Ian, Wake, David A., Bland-Hawthorn, Joss, Bridges, Terry J., Carson, Daniel, Colless, Matthew, Couch, Warrick J., Croom, Scott M., Driver, Simon P., Hewett, Paul C., Loveday, Jon, Ross, Nic, Schneider, Donald P., Shanks, Tom, Sharp, Robert G., Weilbacher, Peter, Roseboom, Isaac G., Pimbblet, Kevin A., Drinkwater, Michael J., Cannon, Russell D., De Propris, Roberto, Edge, Alastair C., Eisenstein, Daniel J., Nichol, Robert C., Smail, Ian, Wake, David A., Bland-Hawthorn, Joss, Bridges, Terry J., Carson, Daniel, Colless, Matthew, Couch, Warrick J., Croom, Scott M., Driver, Simon P., Hewett, Paul C., Loveday, Jon, Ross, Nic, Schneider, Donald P., Shanks, Tom, Sharp, Robert G., and Weilbacher, Peter

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111. MegaZ-LRG: a photometric redshift catalogue of one million SDSS luminous red galaxies

Author

Collister, Adrian, Lahav, Ofer, Blake, Chris, Cannon, Russell, Croom, Scott, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Loveday, Jon, Nichol, Robert, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Ross, Nic, Schneider, Donald P., Shanks, Tom, Wake, David, Collister, Adrian, Lahav, Ofer, Blake, Chris, Cannon, Russell, Croom, Scott, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Loveday, Jon, Nichol, Robert, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Ross, Nic, Schneider, Donald P., Shanks, Tom, and Wake, David

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112. The 2dF-SDSS LRG and QSO Survey: evolution of the clustering of luminous red galaxies since z= 0.6

Author

Wake, David A., Sheth, Ravi K., Nichol, Robert C., Baugh, Carlton M., Bland-Hawthorn, Joss, Colless, Matthew, Couch, Warrick J., Croom, Scott M., De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair C., Loveday, Jon, Lam, Tsz Yan, Pimbblet, Kevin A., Roseboom, Isaac G., Ross, Nicholas P., Schneider, Donald P., Shanks, Tom, Sharp, Robert G., Wake, David A., Sheth, Ravi K., Nichol, Robert C., Baugh, Carlton M., Bland-Hawthorn, Joss, Colless, Matthew, Couch, Warrick J., Croom, Scott M., De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair C., Loveday, Jon, Lam, Tsz Yan, Pimbblet, Kevin A., Roseboom, Isaac G., Ross, Nicholas P., Schneider, Donald P., Shanks, Tom, and Sharp, Robert G.

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113. The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue

Author

Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, Bridges, Terry, Brunner, Robert J., Cannon, Russell, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair, Fine, Stephen, Loveday, Jon, Miller, Lance, Myers, Adam D., Nichol, Robert C., Outram, Phil, Pimbblet, Kevin, Roseboom, Isaac, Ross, Nicholas, Schneider, Donald P., Smith, Allyn, Stoughton, Chris, Strauss, Michael A., Wake, David, Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, Bridges, Terry, Brunner, Robert J., Cannon, Russell, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair, Fine, Stephen, Loveday, Jon, Miller, Lance, Myers, Adam D., Nichol, Robert C., Outram, Phil, Pimbblet, Kevin, Roseboom, Isaac, Ross, Nicholas, Schneider, Donald P., Smith, Allyn, Stoughton, Chris, Strauss, Michael A., and Wake, David

Abstract

We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at probing in detail the faint end of the broad line active galactic nuclei luminosity distribution at z <~ 2.6. The candidate QSOs were selected from SDSS photometry and observed spectroscopically with the 2dF spectrograph on the Anglo-Australian Telescope. This sample covers an area of 191.9deg2 and contains new spectra of 16326 objects, of which 8764 are QSOs and 7623 are newly discovered [the remainder were previously identified by the 2dF QSO Redshift Survey (2QZ) and SDSS]. The full QSO sample (including objects previously observed in the SDSS and 2QZ surveys) contains 12702 QSOs. The new 2SLAQ spectroscopic data set also contains 2343 Galactic stars, including 362 white dwarfs, and 2924 narrow emission-line galaxies with a median redshift of z = 0.22. We present detailed completeness estimates for the survey, based on modelling of QSO colours, including host-galaxy contributions. This calculation shows that at g ~= 21.85 QSO colours are significantly affected by the presence of a host galaxy up to redshift z ~ 1 in the SDSS ugriz bands. In particular, we see a significant reddening of the objects in g - i towards the fainter g-band magnitudes. This reddening is consistent with the QSO host galaxies being dominated by a stellar population of age at least 2-3Gyr.

114. The 2df SDSS LRG and QSO survey: evolution of the luminosity function of luminous red galaxies to z= 0.6

Author

Wake, David A., Nichol, Robert C., Eisenstein, Daniel J., Loveday, Jon, Edge, Alastair C., Cannon, Russell, Smail, Ian, Schneider, Donald P., Scranton, Ryan, Carson, Daniel, Ross, Nicholas P., Brunner, Robert J., Colless, Matthew, Couch, Warrwick J., Croom, Scott M., Driver, Simon P., da Ângela, José, Jester, Sebastian, de Propris, Roberto, Drinkwater, Michael J., Bland-Hawthorn, Joss, Pimbblet, Kevin A., Roseboom, Isaac G., Shanks, Tom, Sharp, Robert G., Brinkmann, Jon, Wake, David A., Nichol, Robert C., Eisenstein, Daniel J., Loveday, Jon, Edge, Alastair C., Cannon, Russell, Smail, Ian, Schneider, Donald P., Scranton, Ryan, Carson, Daniel, Ross, Nicholas P., Brunner, Robert J., Colless, Matthew, Couch, Warrwick J., Croom, Scott M., Driver, Simon P., da Ângela, José, Jester, Sebastian, de Propris, Roberto, Drinkwater, Michael J., Bland-Hawthorn, Joss, Pimbblet, Kevin A., Roseboom, Isaac G., Shanks, Tom, Sharp, Robert G., and Brinkmann, Jon

Abstract

We present new measurements of the luminosity function (LF) of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS) and the 2dF SDSS LRG and Quasar (2SLAQ) survey. We have carefully quantified, and corrected for, uncertainties in the K and evolutionary corrections, differences in the colour selection methods, and the effects of photometric errors, thus ensuring we are studying the same galaxy population in both surveys. Using a limited subset of 6326 SDSS LRGs (with 0.17 < z < 0.24) and 1725 2SLAQ LRGs (with 0.5 < z < 0.6), for which the matching colour selection is most reliable, we find no evidence for any additional evolution in the LRG LF, over this redshift range, beyond that expected from a simple passive evolution model. This lack of additional evolution is quantified using the comoving luminosity density of SDSS and 2SLAQ LRGs, brighter than M0.2r − 5 log h,sub>0.7 = −22.5, which are 2.51 ± 0.03 × 10−7 L⊙ Mpc−3 and 2.44 ± 0.15 × 10−7 L⊙ Mpc−3, respectively (<10 per cent uncertainty). We compare our LFs to the COMBO-17 data and find excellent agreement over the same redshift range. Together, these surveys show no evidence for additional evolution (beyond passive) in the LF of LRGs brighter than M0.2r − 5 log h0.7 = −21 (or brighter than ~L∗ ). We test our SDSS and 2SLAQ LFs against a simple ‘dry merger’ model for the evolution of massive red galaxies and find that at least half of the LRGs at z ≃ 0.2 must already have been well assembled (with more than half their stellar mass) by z ≃ 0.6. This limit is barely consistent with recent results from semi-analytical models of galaxy evolution.

115. The 2dF-SDSS LRG and QSO (2SLAQ) luminous red galaxy survey

Author

Cannon, Russell, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Nichol, Robert, Outram, Phillip, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Wake, David, Allen, Paul, Bland-Hawthorn, Joss, Bridges, Terry, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, Croom, Scott, Driver, Simon, Fine, Stephen, Hewett, Paul, Loveday, Jon, Ross, Nicholas, Sadler, Elaine M., Shanks, Tom, Sharp, Robert, Smith, J. Allyn, Stoughton, Chris, Weilbacher, Peter, Brunner, Robert J., Meiksin, Avery, Schneider, Donald P., Cannon, Russell, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Nichol, Robert, Outram, Phillip, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Wake, David, Allen, Paul, Bland-Hawthorn, Joss, Bridges, Terry, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, Croom, Scott, Driver, Simon, Fine, Stephen, Hewett, Paul, Loveday, Jon, Ross, Nicholas, Sadler, Elaine M., Shanks, Tom, Sharp, Robert, Smith, J. Allyn, Stoughton, Chris, Weilbacher, Peter, Brunner, Robert J., Meiksin, Avery, and Schneider, Donald P.

Abstract

We present a spectroscopic survey of almost 15 000 candidate intermediate-redshift luminous red galaxies (LRGs) brighter than i = 19.8, observed with 2dF on the Anglo-Australian Telescope. The targets were selected photometrically from the Sloan Digital Sky Survey (SDSS) and lie along two narrow equatorial strips covering 180 deg2. Reliable redshifts were obtained for 92 per cent of the targets and the selection is very efficient: over 90 per cent have 0.45 < z < 0.8. More than 80 per cent of the ~11 000 red galaxies have pure absorption-line spectra consistent with a passively evolving old stellar population. The redshift, photometric and spatial distributions of the LRGs are described. The 2SLAQ data will be released publicly from mid-2006, providing a powerful resource for observational cosmology and the study of galaxy evolution.

116. The 2dF-SDSS LRG and QSO (2SLAQ) luminous red galaxy survey

Author

Cannon, Russell, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Nichol, Robert, Outram, Phillip, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Wake, David, Allen, Paul, Bland-Hawthorn, Joss, Bridges, Terry, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, Croom, Scott, Driver, Simon, Fine, Stephen, Hewett, Paul, Loveday, Jon, Ross, Nicholas, Sadler, Elaine M., Shanks, Tom, Sharp, Robert, Smith, J. Allyn, Stoughton, Chris, Weilbacher, Peter, Brunner, Robert J., Meiksin, Avery, Schneider, Donald P., Cannon, Russell, Drinkwater, Michael, Edge, Alastair, Eisenstein, Daniel, Nichol, Robert, Outram, Phillip, Pimbblet, Kevin, De Propris, Roberto, Roseboom, Isaac, Wake, David, Allen, Paul, Bland-Hawthorn, Joss, Bridges, Terry, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, Croom, Scott, Driver, Simon, Fine, Stephen, Hewett, Paul, Loveday, Jon, Ross, Nicholas, Sadler, Elaine M., Shanks, Tom, Sharp, Robert, Smith, J. Allyn, Stoughton, Chris, Weilbacher, Peter, Brunner, Robert J., Meiksin, Avery, and Schneider, Donald P.

Abstract

We present a spectroscopic survey of almost 15 000 candidate intermediate-redshift luminous red galaxies (LRGs) brighter than i = 19.8, observed with 2dF on the Anglo-Australian Telescope. The targets were selected photometrically from the Sloan Digital Sky Survey (SDSS) and lie along two narrow equatorial strips covering 180 deg2. Reliable redshifts were obtained for 92 per cent of the targets and the selection is very efficient: over 90 per cent have 0.45 < z < 0.8. More than 80 per cent of the ~11 000 red galaxies have pure absorption-line spectra consistent with a passively evolving old stellar population. The redshift, photometric and spatial distributions of the LRGs are described. The 2SLAQ data will be released publicly from mid-2006, providing a powerful resource for observational cosmology and the study of galaxy evolution.

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117. The 2df SDSS LRG and QSO survey: evolution of the luminosity function of luminous red galaxies to z= 0.6

Author

Wake, David A., Nichol, Robert C., Eisenstein, Daniel J., Loveday, Jon, Edge, Alastair C., Cannon, Russell, Smail, Ian, Schneider, Donald P., Scranton, Ryan, Carson, Daniel, Ross, Nicholas P., Brunner, Robert J., Colless, Matthew, Couch, Warrwick J., Croom, Scott M., Driver, Simon P., da Ângela, José, Jester, Sebastian, de Propris, Roberto, Drinkwater, Michael J., Bland-Hawthorn, Joss, Pimbblet, Kevin A., Roseboom, Isaac G., Shanks, Tom, Sharp, Robert G., Brinkmann, Jon, Wake, David A., Nichol, Robert C., Eisenstein, Daniel J., Loveday, Jon, Edge, Alastair C., Cannon, Russell, Smail, Ian, Schneider, Donald P., Scranton, Ryan, Carson, Daniel, Ross, Nicholas P., Brunner, Robert J., Colless, Matthew, Couch, Warrwick J., Croom, Scott M., Driver, Simon P., da Ângela, José, Jester, Sebastian, de Propris, Roberto, Drinkwater, Michael J., Bland-Hawthorn, Joss, Pimbblet, Kevin A., Roseboom, Isaac G., Shanks, Tom, Sharp, Robert G., and Brinkmann, Jon

Abstract

We present new measurements of the luminosity function (LF) of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS) and the 2dF SDSS LRG and Quasar (2SLAQ) survey. We have carefully quantified, and corrected for, uncertainties in the K and evolutionary corrections, differences in the colour selection methods, and the effects of photometric errors, thus ensuring we are studying the same galaxy population in both surveys. Using a limited subset of 6326 SDSS LRGs (with 0.17 < z < 0.24) and 1725 2SLAQ LRGs (with 0.5 < z < 0.6), for which the matching colour selection is most reliable, we find no evidence for any additional evolution in the LRG LF, over this redshift range, beyond that expected from a simple passive evolution model. This lack of additional evolution is quantified using the comoving luminosity density of SDSS and 2SLAQ LRGs, brighter than M0.2r − 5 log h,sub>0.7 = −22.5, which are 2.51 ± 0.03 × 10−7 L⊙ Mpc−3 and 2.44 ± 0.15 × 10−7 L⊙ Mpc−3, respectively (<10 per cent uncertainty). We compare our LFs to the COMBO-17 data and find excellent agreement over the same redshift range. Together, these surveys show no evidence for additional evolution (beyond passive) in the LF of LRGs brighter than M0.2r − 5 log h0.7 = −21 (or brighter than ~L∗ ). We test our SDSS and 2SLAQ LFs against a simple ‘dry merger’ model for the evolution of massive red galaxies and find that at least half of the LRGs at z ≃ 0.2 must already have been well assembled (with more than half their stellar mass) by z ≃ 0.6. This limit is barely consistent with recent results from semi-analytical models of galaxy evolution.

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118. The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue

Author

Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, Bridges, Terry, Brunner, Robert J., Cannon, Russell, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair, Fine, Stephen, Loveday, Jon, Miller, Lance, Myers, Adam D., Nichol, Robert C., Outram, Phil, Pimbblet, Kevin, Roseboom, Isaac, Ross, Nicholas, Schneider, Donald P., Smith, Allyn, Stoughton, Chris, Strauss, Michael A., Wake, David, Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, Bridges, Terry, Brunner, Robert J., Cannon, Russell, Carson, Daniel, Chiu, Kuenley, Colless, Matthew, Couch, Warrick, De Propris, Roberto, Drinkwater, Michael J., Edge, Alastair, Fine, Stephen, Loveday, Jon, Miller, Lance, Myers, Adam D., Nichol, Robert C., Outram, Phil, Pimbblet, Kevin, Roseboom, Isaac, Ross, Nicholas, Schneider, Donald P., Smith, Allyn, Stoughton, Chris, Strauss, Michael A., and Wake, David

Abstract

We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at probing in detail the faint end of the broad line active galactic nuclei luminosity distribution at z <~ 2.6. The candidate QSOs were selected from SDSS photometry and observed spectroscopically with the 2dF spectrograph on the Anglo-Australian Telescope. This sample covers an area of 191.9deg2 and contains new spectra of 16326 objects, of which 8764 are QSOs and 7623 are newly discovered [the remainder were previously identified by the 2dF QSO Redshift Survey (2QZ) and SDSS]. The full QSO sample (including objects previously observed in the SDSS and 2QZ surveys) contains 12702 QSOs. The new 2SLAQ spectroscopic data set also contains 2343 Galactic stars, including 362 white dwarfs, and 2924 narrow emission-line galaxies with a median redshift of z = 0.22. We present detailed completeness estimates for the survey, based on modelling of QSO colours, including host-galaxy contributions. This calculation shows that at g ~= 21.85 QSO colours are significantly affected by the presence of a host galaxy up to redshift z ~ 1 in the SDSS ugriz bands. In particular, we see a significant reddening of the objects in g - i towards the fainter g-band magnitudes. This reddening is consistent with the QSO host galaxies being dominated by a stellar population of age at least 2-3Gyr.

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119. Millimeter-wave cosmology with Bolocam: Discovering galaxies and clusters with deep, unbiased surveys

Author

Metcalfe, Nigel, Shanks, Tom, Glenn, Jason, Knowles, Benjamin, Rownd, Brooks K., Edgington, Samantha F., Golwala, Sunil, Lange, Andrew E., Bock, James J., Goldin, Alexey, Nguyen, Hien, Ade, Peter A. R., Haig, Douglas, Mauskopf, Philip Daniel, Metcalfe, Nigel, Shanks, Tom, Glenn, Jason, Knowles, Benjamin, Rownd, Brooks K., Edgington, Samantha F., Golwala, Sunil, Lange, Andrew E., Bock, James J., Goldin, Alexey, Nguyen, Hien, Ade, Peter A. R., Haig, Douglas, and Mauskopf, Philip Daniel

130. The Age of the Galaxy

Author

Freeman, K. C., Frenk, Carlos S., editor, Ellis, Richard S., editor, Shanks, Tom, editor, Heavens, Alan F., editor, and Peacock, John A., editor

Published
1989
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135. Galaxy Mergers in a CDM Model

Author

Carlberg, R. G., Couchman, H. M. P., Frenk, Carlos S., editor, Ellis, Richard S., editor, Shanks, Tom, editor, Heavens, Alan F., editor, and Peacock, John A., editor

Published
1989
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