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        Misalignment between cold gas and stellar components in early-type galaxies

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        Author
        Wong, O.I.
        Schawinski, K.
        Jozsa, G.I.
        Urry, C.M.
        Lintott, C.J.
        Simmons, B.D.
        Kaviraj, Sugata
        Masters, K.L.
        Attention
        2299/16778
        Abstract
        Recent work suggests blue ellipticals form in mergers and migrate quickly from the blue cloud of star-forming galaxies to the red sequence of passively evolving galaxies, perhaps as a result of black hole feedback. Such rapid reddening of stellar populations implies that large gas reservoirs in the pre-merger star-forming pair must be depleted on short time-scales. Here we present pilot observations of atomic hydrogen gas in four blue early-type galaxies that reveal increasing spatial offsets between the gas reservoirs and the stellar components of the galaxies, with advancing post-starburst age. Emission line spectra show associated nuclear activity in two of the merged galaxies, and in one case radio lobes aligned with the displaced gas reservoir. These early results suggest that a kinetic process (possibly feedback from black hole activity) is driving the quick truncation of star formation in these systems, rather than a simple exhaustion of gas supply
        Publication date
        2015-03-11
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stu2724
        Other links
        http://hdl.handle.net/2299/16778
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