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3 results on '"Kyle A. Oman"'

1. Gas and Star Formation in Satellites of Milky Way Analogs

Author

Michael G. Jones, David J. Sand, Ananthan Karunakaran, Kristine Spekkens, Kyle A. Oman, Paul Bennet, Gurtina Besla, Denija Crnojević, Jean-Charles Cuillandre, Catherine E. Fielder, Stephen Gwyn, and Burçin Mutlu-Pakdil

Subjects
Dwarf galaxies, Galaxy quenching, Ram pressure stripped tails, Interstellar atomic gas, Circumgalactic medium, Astrophysics, QB460-466
Abstract

We have imaged the entirety of eight (plus one partial) Milky Way (MW)–like satellite systems, a total of 42 (45) satellites, from the Satellites Around Galactic Analogs II catalog in both H α and H i with the Canada–France–Hawaii Telescope and the Jansky Very Large Array. In these eight systems we have identified four cases where a satellite appears to be currently undergoing ram pressure stripping (RPS) as its H i gas collides with the circumgalactic medium (CGM) of its host. We also see a clear suppression of gas fraction ( M _HI / M _* ) with decreasing (projected) satellite–host separation—to our knowledge, the first time this has been observed in a sample of MW-like systems. Comparisons to the Auriga, A Project Of Simulating The Local Environment, and TNG50 cosmological zoom-in simulations show consistent global behavior, but they systematically underpredict gas fractions across all satellites by roughly 0.5 dex. Using a simplistic RPS model, we estimate the average peak CGM density that satellites in these systems have encountered to be $\mathrm{log}{\rho }_{\mathrm{cgm}}/{\rm{g}}\,{\mathrm{cm}}^{-3}\approx -27.3$ . Furthermore, we see tentative evidence that these satellites are following a specific star formation rate to gas fraction relation that is distinct from field galaxies. Finally, we detect one new gas-rich satellite in the UGC 903 system with an optical size and surface brightness meeting the standard criteria to be considered an ultra-diffuse galaxy.

Published
2024
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2. The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package*

Author

Adrian M. Price-Whelan, Pey Lian Lim, Nicholas Earl, Nathaniel Starkman, Larry Bradley, David L. Shupe, Aarya A. Patil, Lia Corrales, C. E. Brasseur, Maximilian Nöthe, Axel Donath, Erik Tollerud, Brett M. Morris, Adam Ginsburg, Eero Vaher, Benjamin A. Weaver, James Tocknell, William Jamieson, Marten H. van Kerkwijk, Thomas P. Robitaille, Bruce Merry, Matteo Bachetti, H. Moritz Günther, Thomas L. Aldcroft, Jaime A. Alvarado-Montes, Anne M. Archibald, Attila Bódi, Shreyas Bapat, Geert Barentsen, Juanjo Bazán, Manish Biswas, Médéric Boquien, D. J. Burke, Daria Cara, Mihai Cara, Kyle E Conroy, Simon Conseil, Matthew W. Craig, Robert M. Cross, Kelle L. Cruz, Francesco D’Eugenio, Nadia Dencheva, Hadrien A. R. Devillepoix, Jörg P. Dietrich, Arthur Davis Eigenbrot, Thomas Erben, Leonardo Ferreira, Daniel Foreman-Mackey, Ryan Fox, Nabil Freij, Suyog Garg, Robel Geda, Lauren Glattly, Yash Gondhalekar, Karl D. Gordon, David Grant, Perry Greenfield, Austen M. Groener, Steve Guest, Sebastian Gurovich, Rasmus Handberg, Akeem Hart, Zac Hatfield-Dodds, Derek Homeier, Griffin Hosseinzadeh, Tim Jenness, Craig K. Jones, Prajwel Joseph, J. Bryce Kalmbach, Emir Karamehmetoglu, Mikołaj Kałuszyński, Michael S. P. Kelley, Nicholas Kern, Wolfgang E. Kerzendorf, Eric W. Koch, Shankar Kulumani, Antony Lee, Chun Ly, Zhiyuan Ma, Conor MacBride, Jakob M. Maljaars, Demitri Muna, N. A. Murphy, Henrik Norman, Richard O’Steen, Kyle A. Oman, Camilla Pacifici, Sergio Pascual, J. Pascual-Granado, Rohit R. Patil, Gabriel I Perren, Timothy E. Pickering, Tanuj Rastogi, Benjamin R. Roulston, Daniel F Ryan, Eli S. Rykoff, Jose Sabater, Parikshit Sakurikar, Jesús Salgado, Aniket Sanghi, Nicholas Saunders, Volodymyr Savchenko, Ludwig Schwardt, Michael Seifert-Eckert, Albert Y. Shih, Anany Shrey Jain, Gyanendra Shukla, Jonathan Sick, Chris Simpson, Sudheesh Singanamalla, Leo P. Singer, Jaladh Singhal, Manodeep Sinha, Brigitta M. Sipőcz, Lee R. Spitler, David Stansby, Ole Streicher, Jani Šumak, John D. Swinbank, Dan S. Taranu, Nikita Tewary, Grant R. Tremblay, Miguel de Val-Borro, Samuel J. Van Kooten, Zlatan Vasović, Shresth Verma, José Vinícius de Miranda Cardoso, Peter K. G. Williams, Tom J. Wilson, Benjamin Winkel, W. M. Wood-Vasey, Rui Xue, Peter Yoachim, Chen Zhang, and Andrea Zonca

Published
2022
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3. The SAMI Galaxy Survey: Quenching of Star Formation in Clusters I. Transition Galaxies

Author

Scott M. Croom, Michael J. Hudson, Kyle A. Oman, Joss Bland-Hawthorn, Warrick J. Couch, Julia J. Bryant, Sarah Brough, Matt S. Owers, Richard M. McDermid, Nicholas Scott, Nuria P. F. Lorente, Anne M. Medling, Sukyoung K. Yi, Luca Cortese, Charlotte Welker, Christoph Federrath, Dan S. Taranu, Andrew M. Hopkins, Samuel N. Richards, Jesse van de Sande, Brent Groves, Jon Lawrence, and Astronomy

Subjects
RAM-PRESSURE, 010504 meteorology & atmospheric sciences, media_common.quotation_subject, Library science, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Research initiative, 01 natural sciences, INTEGRAL-FIELD SPECTROSCOPY, Excellence, 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, media_common, Physics, REDSHIFT SURVEY, FORMATION HISTORIES, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, FORMATION RATES, Joint research, Space and Planetary Science, Research council, galaxies: clusters: general, STELLAR POPULATION SYNTHESIS, Astrophysics of Galaxies (astro-ph.GA), galaxies: star formation, MASS ASSEMBLY GAMA, PRESSURE STRIPPING EVENTS, DIGITAL SKY SURVEY, galaxies: evolution, SDSS-IV MANGA
Abstract

We use integral field spectroscopy from the SAMI Galaxy Survey to identify galaxies that show evidence for recent quenching of star formation. The galaxies exhibit strong Balmer absorption in the absence of ongoing star formation in more than 10% of their spectra within the SAMI field of view. These $\rm{H}{\delta}$-strong galaxies (HDSGs) are rare, making up only $\sim 2$% (25/1220) of galaxies with stellar mass ${\rm log(}M_*/M_{\odot})>10$. The HDSGs make up a significant fraction of non-passive cluster galaxies (15%; 17/115) and a smaller fraction (2.0%; 8/387) of the non-passive population in low-density environments. The majority (9/17) of cluster HDSGs show evidence for star formation at their centers, with the HDS regions found in the outer parts of the galaxy. Conversely, the $\rm{H}{\delta}$-strong signal is more evenly spread across the galaxy for the majority (6/8) of HDSGs in low-density environments, and is often associated with emission lines that are not due to star formation. We investigate the location of the HDSGs in the clusters, finding that they are exclusively within 0.6$R_{200}$ of the cluster centre, and have a significantly higher velocity dispersion relative to the cluster population. Comparing their distribution in projected-phase-space to those derived from cosmological simulations indicates that the cluster HDSGs are consistent with an infalling population that have entered the central 0.5$r_{200, 3D}$ cluster region within the last $\sim 1\,$Gyr. In the 8/9 cluster HDSGs with central star formation, the extent of star formation is consistent with that expected of outside-in quenching by ram-pressure stripping. Our results indicate that the cluster HDSGs are currently being quenched by ram-pressure stripping on their first passage through the cluster., Comment: 44 pages (including 8 pages of appendices), 18 figures, 3 tables. Accepted for publicatioin in ApJ

Published
2019

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