Integral Field spectroscopy of two HI rich E+A galaxies

Abstract

Approximately half of the nearby E+A galaxies followed up with 21-cm observations have detectable HI emission. The optical spectra of these galaxies show strong post-starburst stellar populations but no optical emission lines implying star-formation is not ongoing despite the presence of significant gas reservoirs. We have obtained integral field spectroscopic follow up observations of the two brightest, and nearest, of the six E+A galaxies with HI 21-cm emission in the recent sample of Zwaan et al. (2013). In the central regions of both galaxies the observations are consistent with a post-starburst population with little emission. However, outside the central regions both galaxies have strong optical emission lines, with a clumpy or knot-like distribution, indicating ongoing star-formation. We conclude that in these two cases the presence of optical spectra lacking evidence for star-formation while a large gas mass is present can be explained by an aperture effect in selecting the nearby E+A galaxies using single-fibre spectroscopy that probes only the galaxy core.

arXiv commentAccepted to MNRAS, 7 pages, 2 figures

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• The Effect of AGN on the Global HI Content of Isolated Low-Mass Galaxies
• Spiral-like star-forming patterns in CALIFA early-type galaxies
• Spectroscopic aperture biases in inside-out evolving early-type galaxies from CALIFA
• Spectral features of tidal-disruption candidates and alternative origins for such transient flares
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• The Many Assembly Histories of Massive Void Galaxies as Revealed by Integral Field Spectroscopy
• Refining the E+A Galaxy: A Spatially Resolved Spectrophotometric Sample of Nearby Post-starburst Systems in SDSS-IV MaNGA (MPL-5)
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