Edmond Cheung, David V. Stark, Song Huang, Kate H.R. Rubin, Lihwai Lin, Christy Tremonti, Kai Zhang, Renbin Yan, Dmitry Bizyaev, Médéric Boquien, Joel R. Brownstein, Niv Drory, Joseph D. Gelfand, Johan H. Knapen, Roberto Maiolino, Olena Malanushenko, Karen L. Masters, Michael R. Merrifield, Zach Pace, Kaike PanRogemar A. Riffel, Alexandre Roman-Lopes, Wiphu Rujopakarn, Donald P. Schneider, John P. Stott, Daniel Thomas, Anne Marie Weijmans

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The nature of warm, ionized gas outside of galaxies may illuminate several key galaxy evolutionary processes. A serendipitous observation by the MaNGA survey has revealed a large, asymmetric Hα complex with no optical counterpart that extends ≈8″ (≈6.3 kpc) beyond the effective radius of a dusty, starbursting galaxy. This Hα extension is approximately three times the effective radius of the host galaxy and displays a tail-like morphology. We analyze its gas-phase metallicities, gaseous kinematics, and emission-line ratios and discuss whether this Hα extension could be diffuse ionized gas, a gas accretion event, or something else. We find that this warm, ionized gas structure is most consistent with gas accretion through recycled wind material, which could be an important process that regulates the low-mass end of the galaxy stellar mass function.

Original languageEnglish
Article number182
JournalAstrophysical Journal
Issue number2
StatePublished - Dec 1 2016

Bibliographical note

Funding Information:
The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autonoma de Mexico, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. D.B. is supported by grant RSCF-14-22-00041. A.W. acknowledges support from a Leverhulme Early Career Fellowship. J.H.K. acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2013-41243-P and thanks the Astrophysics Research Institute of Liverpool John Moores University for their hospitality, and the Spanish Ministry of Education, Culture and Sports for financial support of his visit there, through grant number PR2015-00512.

Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.


  • galaxies: abundances
  • galaxies: evolution
  • galaxies: formation
  • galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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