SDSS IV MaNGA: discovery of an Hα blob associated with a dry galaxy pair - ejected gas or a 'dark' galaxy candidate?

Lihwai Lin, Jing-Hua Lin, Chin-Hao Hsu, Hai Fu, Song Huang, Sebastián F. Sánchez, Stephen Gwyn, Joseph D. Gelfand, Edmond Cheung, Karen Masters, Sébastien Peirani, Wiphu Rujopakarn, David V. Stark, Francesco Belfiore, M. S. Bothwell, Kevin Bundy, Alex Hagen, Lei Hao, Shan Huang, David LawCheng Li, Chris Lintott, Roberto Maiolino, Alexandre Roman-Lopes, Wei-Hao Wang, Ting Xiao, Fangting Yuan, Dmitry Bizyaev, Elena Malanushenko, Niv Drory, J. G. Fernández-Trincado, Zach Pace, Kaike Pan, Daniel Thomas

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Abstract

We report the discovery of a mysterious giant Halpha blob that is ~8 kpc away from the main MaNGA target 1-24145, one component of a dry galaxy merger, identified in the first-year SDSS-IV MaNGA data. The size of the Halpha blob is ~3-4 kpc in radius, and the Halpha distribution is centrally concentrated. However, there is no optical continuum counterpart in deep broadband images reaching ~26.9 mag per arcsec sq in surface brightness. We estimate that the masses of ionized and cold gases are 3.3 x 10^5 Msun and galaxy (UDG) interacting with MaNGA 1-24145 that further induces the gas inflow to fuel the AGN in MaNGA 1-24145.
Original languageEnglish
JournalThe Astrophysical Journal
Volume837
Issue number1
DOIs
Publication statusPublished - 28 Feb 2017

Keywords

  • astro-ph.GA
  • galaxies: evolution
  • galaxies: interactions
  • galaxies: peculiar

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