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Title:
A Herschel-ATLAS study of dusty spheroids: probing the minor-merger process in the local Universe
Authors:
Kaviraj, S.; Rowlands, K.; Alpaslan, M.; Dunne, L.; Ting, Y. S.; Bureau, M.; Shabala, S.; Lintott, C. J.; Smith, D. J. B.; Agius, N.; Auld, R.; Baes, M.; Bourne, N.; Cava, A.; Clements, D. L.; Cooray, A.; Dariush, A.; De Zotti, G.; Driver, S. P.; Eales, S.; Hopwood, R.; Hoyos, C.; Ibar, E.; Maddox, S.; Michalowski, M. J.; Sansom, A. E.; Smith, M.; Valiante, E.
Affiliation:
AA(Centre for Astrophysics, Science & Technology Research Institute, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK; Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK; Blackett Laboratory, Imperial College London, London SW7 2AZ, UK; ), AB(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK), AC(International Centre for Radio Astronomy (ICRAR), University of Western Australia, Crawley WA 6009, Australia; (SUPA) School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK), AD(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK; Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand), AE(Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK), AF(Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK), AG(School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart TAS 7001, Australia), AH(Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK), AI(Centre for Astrophysics, Science & Technology Research Institute, University of Hertfordshire, Hatfield, Herts AL10 9AB, UK), AJ(Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK), AK(School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardif CF24 3AA, UK), AL(Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281-S9, B-9000 Gent, Belgium), AM(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK), AN(Departamento de Astrofísica, Facultad de CC. Físicas, Universidad Complutense de Madrid, E-28040 Madrid, Spain), AO(Blackett Laboratory, Imperial College London, London SW7 2AZ, UK), AP(Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA), AQ(Blackett Laboratory, Imperial College London, London SW7 2AZ, UK), AR(INAF-Osservatorio Astronomico di Padova, Vicolo Osservatorio 5, I-35122 Padova, Italy; SISSA, Via Bonomea 265, I-34136 Trieste, Italy), AS(International Centre for Radio Astronomy (ICRAR), University of Western Australia, Crawley WA 6009, Australia; (SUPA) School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK), AT(School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardif CF24 3AA, UK), AU(Blackett Laboratory, Imperial College London, London SW7 2AZ, UK), AV(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK), AW(UK Astronomy Technology Centre, Royal Observatory, Edinburgh EH9 3HJ, UK), AX(School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK; Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand), AY(Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281-S9, B-9000 Gent, Belgium; (SUPA) Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK), AZ(Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK), BA(School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardif CF24 3AA, UK), BB(School of Physics & Astronomy, Cardiff University, Queens Buildings, The Parade, Cardif CF24 3AA, UK)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 435, Issue 2, p.1463-1468 (MNRAS Homepage)
Publication Date:
10/2013
Origin:
OUP
Astronomy Keywords:
galaxies: elliptical and lenticular, cD, galaxies: evolution, galaxies: formation, galaxies: interactions, galaxies: ISM
Abstract Copyright:
2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/stt1629
Bibliographic Code:
2013MNRAS.435.1463K

Abstract

We use multiwavelength (0.12-500 mum) photometry from Herschel-ATLAS, WISE, UKIDSS, SDSS and GALEX to study 23 nearby spheroidal galaxies with prominent dust lanes (DLSGs). DLSGs are considered to be remnants of recent minor mergers, making them ideal laboratories for studying both the interstellar medium (ISM) of spheroids and minor-merger-driven star formation in the nearby Universe. The DLSGs exhibit star formation rates (SFRs) between 0.01 and 10 M&sun; yr-1, with a median of 0.26 M&sun; yr-1 (a factor of 3.5 greater than the average SG). The median dust mass, dust-to-stellar mass ratio and dust temperature in these galaxies are around 107.6 M&sun;, ≈0.05 per cent and ≈19.5 K, respectively. The dust masses are at least a factor of 50 greater than that expected from stellar mass loss and, like the SFRs, show no correlation with galaxy luminosity, suggesting that both the ISM and the star formation have external drivers. Adopting literature gas-to-dust ratios and star formation histories derived from fits to the panchromatic photometry, we estimate that the median current and initial gas-to-stellar mass ratios in these systems are ≈4 and ≈7 per cent, respectively. If, as indicated by recent work, minor mergers that drive star formation in spheroids with (NUV - r) > 3.8 (the colour range of our DLSGs) have stellar mass ratios between 1:6 and 1:10, then the satellite gas fractions are likely >=50 per cent.
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