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Discovery of multiphase cold accretion in a massive galaxy at z = 0.7

Kacprzak, Glenn G. and Churchill, Christopher W. and Steidel, Charles C. and Spitler, Lee R. and Holtzman, Jon A. (2012) Discovery of multiphase cold accretion in a massive galaxy at z = 0.7. Monthly Notices of the Royal Astronomical Society, 427 (4). pp. 3029-3043. ISSN 0035-8711.

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We present detailed photo+collisional ionization models and kinematic models of the multiphase absorbing gas, detected within the Hubble Space Telescope(HST)/COS, HST/STIS and Keck/HIRES spectra of the background quasar TON 153 at 104 kpc along the projected minor axis of a star-forming spiral galaxy (z = 0.6610). Complementary g′r′i′Ks photometry and stellar population models indicate that the host galaxy is dominated by an ∼4 Gyr stellar population with slightly greater than solar metallicity and has an estimated log M* = 11 and a log M_vir = 13. Photoionization models of the low-ionization absorption (Mg i, Si ii, Mg ii and C iii), which trace the bulk of hydrogen, constrain the multicomponent gas to be cold (log T = 3.8–5.2) and metal poor (inline image). A lagging halo model reproduces the low-ionization absorption kinematics, suggesting gas coupled to the disc angular momentum, consistent with cold accretion mode material in simulations. The C iv and O vi absorption is best modelled in a separate collisionally ionized metal-poor (−2.50 ≤ [X/H] ≤ −1.93) warm phase with log T = 5.3. Although their kinematics are consistent with a wind model, given the 2–2.5 dex difference between the galaxy stellar metallicity and the absorption metallicity we indicate that the gas cannot arise from galactic winds. We discuss and conclude that although the quasar sightline passes along the galaxy minor axis at a projected distance of 0.3 virial radii, well inside its virial shock radius, the combination of the relative kinematics, temperatures and relative metallicities indicates that the multiphase absorbing gas arises from cold accretion around this massive galaxy. Our results appear to contradict recent interpretations that absorption probing the projected minor axis of a galaxy is sampling winds.

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Steidel, Charles C.0000-0002-4834-7260
Additional Information:© 2012 The Authors. Monthly Notices of the Royal Astronomical Society © 2012 RAS. Accepted 2012 August 15. Received 2012 August 15; in original form 2012 February 28. Article first published online: 7 Dec. 2012. We thank Nicolas Bouch´e for his useful comments, models and for carefully reading this paper. We also thank the anonymous referee for carefully reading the paper and for providing insightful comments. CWC was partially supported through grant HST-GO-11667.01-A provided by NASA via the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. CWC thanks GGK, and Michael T. Murphy, and Swinburne Faculty Research Grants for providing funding for a visit to Swinburne University of Technology. This work is based on observations made with the NASA/ESA Hubble Space Telescope (PID 11667) and those obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). Some of the data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation. This work is also based on observations obtained with the Apache Point Observatory 3.5-m telescope, which is owned and operated by the Astrophysical Research Consortium. Observations were also made with the NASA/ESA Hubble Space Telescope or obtained from the data archive at the Space Telescope Institute.
Funding AgencyGrant Number
NASANAS 5-26555
W. M. Keck FoundationUNSPECIFIED
Subject Keywords:galaxies: ISM; quasars: absorption lines
Issue or Number:4
Record Number:CaltechAUTHORS:20130108-115006064
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Official Citation:Kacprzak, G. G., Churchill, C. W., Steidel, C. C., Spitler, L. R. and Holtzman, J. A. (2012), Discovery of multiphase cold accretion in a massive galaxy at z = 0.7. Monthly Notices of the Royal Astronomical Society, 427: 3029–3043. doi: 10.1111/j.1365-2966.2012.21945.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36236
Deposited By: Jason Perez
Deposited On:08 Jan 2013 22:21
Last Modified:03 Oct 2019 04:36

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