@article{1ac5c06924654eb493e8d96e5da07056,
title = "COS-burst: Observations of the Impact of Starburst-driven Winds on the Properties of the Circum-galactic Medium",
abstract = "We report on observations made with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) using background quasi-stellar objects to probe the circum-galactic medium (CGM) around 17 low-redshift galaxies that are undergoing or have recently undergone a strong starburst (the COS-Burst program). The sightlines extend out to roughly the virial radius of the galaxy halo. We construct control samples of normal star-forming low-redshift galaxies from the COS/HST archive that match the starbursts in terms of galaxy stellar mass and impact parameter. We find clear evidence that the CGM around the starbursts differs systematically compared to the control galaxies. The Lyα, Si iii, C iv, and possibly O vi absorption lines are stronger as a function of impact parameter, and the ratios of the equivalent widths of C iv/Lyα and Si iii/Lyα are both higher than in normal star-forming galaxies. We also find that the widths and the velocity offsets (relative to v sys) of the Lyα absorption lines are significantly larger in the CGM of the starbursts, implying velocities of the absorbing material that are roughly twice the halo virial velocity. We show that these properties can be understood as a consequence of the interaction between a starburst-driven wind and the preexisting CGM. These results underscore the importance of winds driven from intensely star-forming galaxies in helping drive the evolution of galaxies and the intergalactic medium. They also offer a new probe of the properties of starburst-driven winds and of the CGM itself.",
keywords = "galaxies: ISM, galaxies: halos, galaxies: starburst, quasars: absorption lines",
author = "Timothy Heckman and Sanchayeeta Borthakur and Vivienne Wild and David Schiminovich and Rongmon Bordoloi",
note = "Funding Information: This work is based on observations with the NASA/ESA Hubble Space Telescope, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. T.H. and S.B. were supported by grant HST GO 13862. V.W. acknowledges the support of the European Research Council via the award of a starting gant (SEDMorph: P.I. V. Wild). Funding Information: This project also made use of archival SDSS data. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbuka-gakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http:// www.sdss.org/. The SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions. The Participating Institutions are the American Museum of Natural History, Astrophysical Institute Potsdam, University of Basel, University of Cambridge, Case Western Reserve University, University of Chicago, Drexel University, Fermilab, the Institute for Advanced Study, the Japan Participation Group, Johns Hopkins University, the Joint Institute for Nuclear Astrophysics, the Kavli Institute for Particle Astrophysics and Cosmology, the Korean Scientist Group, the Chinese Academy of Sciences (LAMOST), Los Alamos National Laboratory, the Max Planck-Institute for Astronomy (MPIA), the Max Planck-Institute for Astrophysics (MPA), New Mexico State University, Ohio State University, University of Pittsburgh, University of Portsmouth, Princeton University, the United States Naval Observatory, and the University of Washington. Funding Information: T.H. thanks the Kavli Institute for Theoretical Physics, the Simons Foundation, and the Aspen Center for Physics for supporting informal workshops on galactic winds, feedback, and the circum-galactic medium during 2014, 2015, and 2016. These provided important input for this paper. Conversations at these workshops with Romeel Dav{\'e} Crystal Martin, Norm Murray, Ralph Pudritz, Eliot Quataert, Brant Robertson, Chuck Steidel, Todd Thompson, and Ellen Zweibel were especially helpful. He also thanks Greg Bryan, Mark Voit, and Brian O{\textquoteleft}Shea for interesting discussions of the possible importance of wind-driven precipitation. Facility: Sloan (COS). Publisher Copyright: {\textcopyright} 2017. The American Astronomical Society. All rights reserved.",
year = "2017",
month = sep,
day = "10",
doi = "10.3847/1538-4357/aa80dc",
language = "English (US)",
volume = "846",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "2",
}