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

Wong, O. Ivy ; Schawinski, K. ; Józsa, G. I. G. ; Urry, C. M. ; Lintott, C. J. ; Simmons, B. D. ; Kaviraj, S. ; Masters, K. L.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 447, no. 4, p. 3311-3321

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    Titre
    • Misalignment between cold gas and stellar components in early-type galaxies
    Auteur
    • Wong, O. Ivy. International Centre for Radio Astronomy Research, The University of Western Australia M468, 35 Stirling Highway, Crawley, WA 6009, Australia
    • Schawinski, K.. Institute for Astronomy, ETH Zürich, Wolfgang-Pauli-Strasse 27, CH-8093 Zürich, Switzerland
    • Józsa, G. I. G.. SKA South Africa, Radio Astronomy Research Group, 3rd Floor, The Park, Park Road, Pinelands 7405, South Africa
    • Urry, C. M.. Yale Center for Astronomy and Astrophysics and Department of Physics, Yale University, PO Box 208120, New Haven, CT 06520-8120, USA
    • Lintott, C. J.. Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
    • Simmons, B. D.. Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
    • Kaviraj, S.. Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK
    • Masters, K. L.. Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth PO1 3FX, UK
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 447, no. 4, p. 3311-3321. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:294109
    Summary
    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