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Published August 20, 2016 | Published + Submitted
Journal Article Open

Shocked POststarburst Galaxy Survey II: The Molecular Gas Content and Properties of a Subset of SPOGs


We present CO(1–0) observations of objects within the Shocked POststarburst Galaxy Survey taken with the Institut de Radioastronomie Millimétrique 30 m single dish and the Combined Array for Research for Millimeter Astronomy interferometer. Shocked poststarburst galaxies (SPOGs) represent a transitioning population of galaxies, with deep Balmer absorption (EW_(Hδ)>5 Å, consistent with an intermediate-age (A-star) stellar population, and ionized gas line ratios inconsistent with pure star formation. The CO(1–0) subsample was selected from SPOGs detected by the Wide-field Infrared Survey Explorer with 22 μm flux detected at a signal-to-noise ratio (S/N) > 3. Of the 52 objects observed in CO(1–0), 47 are detected with S/N > 3. A large fraction (37%–46% ± 7%) of our CO-SPOG sample were visually classified as morphologically disrupted. The H2 masses detected were between 10^(8.7-10.8)M_☉, consistent with the gas masses found in normal galaxies, though approximately an order of magnitude larger than the range seen in poststarburst galaxies. When comparing the 22 μm and CO(1–0) fluxes, SPOGs diverge from the normal star-forming relation, having 22 μm fluxes in excess of the relation by a factor of 〈є_(MIR) rangle =4.91_(-0.39)^(+0.42), suggestive of the presence of active galactic nuclei (AGNs). The Na i D characteristics of CO-SPOGs show that it is likely that many of these objects host interstellar winds. Objects with large Na i D enhancements also tend to emit in the radio, suggesting possible AGN driving of neutral winds.

Additional Information

© 2016. The American Astronomical Society. Received 2016 February 6; revised 2016 May 19; accepted 2016 June 2; published 2016 August 11. K.A. thanks K. Decker French for useful discussions regarding the "E+A" sample. K.A. also thanks Jonathan McDowell & Michael J. I. Brown for Twitter dialogues regarding WISE and mid-infrared dust emission in AGNs, improving the manuscript. We also thank the anonymous referee for an insightful report that has improved the manuscript. Support for K.A. is provided by NASA through Hubble Fellowship grant #HST-HF2-51352.001 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555. U.L. acknowledges support by the research projects AYA2011-24728 and AYA2014-53506-P financed by the Spanish Ministerio de Economía y Competividad and by FEDER (Fondo Europeo de Desarrollo Regional) and the Junta de Andalucía (Spain) grants FQM108. P.N.A. is partially supported by funding through Herschel, a European Space Agency Cornerstone Mission with significant participation by NASA, through an award issued by JPL/Caltech. S.L.C. was supported by ALMA-CONICYT program 31110020. K.N. acknowledges support from NASA through the Spitzer Space Telescope. A.M.M. and L.J.K. acknowledge the support of the Australian Research Council (ARC) through Discovery project DP130103925. Based on observations carried out with the IRAM 30 m Telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany), and IGN (Spain). Support for CARMA construction was derived from the Gordon and Betty Moore Foundation, the Kenneth T. and Eileen L. Norris Foundation, the James S. McDonnell Foundation, the Associates of the California Institute of Technology, the University of Chicago, the states of California, Illinois, and Maryland, and the National Science Foundation. Ongoing CARMA development and operations are supported by the National Science Foundation under a cooperative agreement, and by the CARMA partner universities. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Facilities: CARMA - Combined Array for Research in Millimeter-Wave Astronomy, IRAM - , WISE - .

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Submitted - 1604.01122v4.pdf

Published - apj_827_2_106.pdf


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August 22, 2023
August 22, 2023