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The ATLAS^(3D) project – XXVI. HI discs in real and simulated fast and slow rotators

Serra, Paolo and Alatalo, Katherine (2014) The ATLAS^(3D) project – XXVI. HI discs in real and simulated fast and slow rotators. Monthly Notices of the Royal Astronomical Society, 444 (4). pp. 3388-3407. ISSN 0035-8711.

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One quarter of all nearby early-type galaxies (ETGs) outside Virgo host a disc/ring of H i with size from a few to tens of kpc and mass up to ∼10^9 M_⊙. Here we investigate whether this H i is related to the presence of a stellar disc within the host making use of the classification of ETGs in fast and slow rotators (FR/SR). We find a large diversity of H i masses and morphologies within both families. Surprisingly, SRs are detected as often, host as much H i and have a similar rate of H i discs/rings as FRs. Accretion of H i is therefore not always linked to the growth of an inner stellar disc. The weak relation between H i and stellar disc is confirmed by their frequent kinematical misalignment in FRs, including cases of polar and counterrotating gas. In SRs the H i is usually polar. This complex picture highlights a diversity of ETG formation histories which may be lost in the relative simplicity of their inner structure and emerges when studying their outer regions. We find that Λ CDM hydrodynamical simulations have difficulties reproducing the H i properties of ETGs. The gas discs formed in simulations are either too massive or too small depending on the star formation feedback implementation. Kinematical misalignments match the observations only qualitatively. The main point of conflict is that nearly all simulated FRs and a large fraction of all simulated SRs host corotating H i. This establishes the H i properties of ETGs as a novel challenge to simulations.

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URLURL TypeDescription Paper
Alatalo, Katherine0000-0002-4261-2326
Additional Information:© 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2013 December 20. Received 2013 November 28; in original form 2013 October 20. PS acknowledges support of a NWO/Veni grant. This work is based on observations obtained with the Westerbork Synthesis Radio Telescope, which is operated by ASTRON (Netherlands Institute for Radio Astronomy) with support from the Netherlands Foundation for Scientific Research (NWO). MC acknowledges support from a Royal Society University Research Fellowship. This work was supported by the rolling grants Astrophysics at Oxford PP/E001114/1 and ST/H002456/1 and visitors grants PPA/V/S/2002/00553, PP/E001564/1 and ST/H504862/1 from the UK Research Councils. RLD acknowledges travel and computer grants from Christ Church, Oxford and support from the Royal Society in the form of a Wolfson Merit Award 502011.K502/jd. RLD is also grateful for support from the Australian Astronomical Observatory Distinguished Visitors programme, the ARC Centre of Excellence for All Sky Astrophysics and the University of Sydney during a sabbatical visit. SK acknowledges support from the Royal Society Joint Projects grant JP0869822. RMMcD is supported by the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., on behalf of the international Gemini partnership of Argentina, Australia, Brazil, Canada, Chile, UK and USA. TN and MBois acknowledge support from the DFG Cluster of Excellence ‘Origin and Structure of the Universe’. MS acknowledges support from a STFC Advanced Fellowship ST/F009186/1. (TAD) The research leading to these results has received funding from the European Community’s Seventh Framework Programme (/FP7/2007-2013/) under grant agreement no. 229517. MBois has received, during this research, funding from the European Research Council under the Advanced Grant Programme no. 267399-Momentum. LMY acknowledges support from NSF grant AST-1109803. MH acknowledges financial support from the European Research Council under the European Community’s Seventh Framework Programme (FP7/2007-2013)/ERC grant agreement no. 202781. The authors acknowledge financial support from ESO.
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Particle Physics and Astronomy Research Council (PPARC)PP/E001114/1
Science and Technology Facilities Council (STFC)ST/H002456/1
Particle Physics and Astronomy Research Council (PPARC)PPA/V/S/2002/00553
Particle Physics and Astronomy Research Council (PPARC)PP/E001564/1
Science and Technology Facilities Council (STFC)ST/H504862/1
Royal Society502011.K502/jd
Australian Astronomical Observatory (AAO)UNSPECIFIED
Royal SocietyJP0869822
Gemini ObservatoryUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Science and Technology Facilities Council (STFC)ST/F009186/1
European Research Council (ERC)229517
European Research Council (ERC)267399-Momentum
European Research Council (ERC)202781
European Southern Observatory (ESO)UNSPECIFIED
Subject Keywords:ISM: kinematics and dynamics galaxies: elliptical and lenticular, cD galaxies: evolution galaxies: formation galaxies: kinematics and dynamics
Issue or Number:4
Record Number:CaltechAUTHORS:20141121-091530314
Persistent URL:
Official Citation:Paolo Serra, Ludwig Oser, Davor Krajnović, Thorsten Naab, Tom Oosterloo, Raffaella Morganti, Michele Cappellari, Eric Emsellem, Lisa M. Young, Leo Blitz, Timothy A. Davis, Pierre-Alain Duc, Michaela Hirschmann, Anne-Marie Weijmans, Katherine Alatalo, Estelle Bayet, Maxime Bois, Frédéric Bournaud, Martin Bureau, Alison F. Crocker, Roger L. Davies, P. T. de Zeeuw, Sadegh Khochfar, Harald Kuntschner, Pierre-Yves Lablanche, Richard M. McDermid, Marc Sarzi, and Nicholas Scott The ATLAS3D project – XXVI. H i discs in real and simulated fast and slow rotators MNRAS (November 11, 2014) Vol. 444 3388-3407 doi:10.1093/mnras/stt2496 First published online September 17, 2014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:52034
Deposited By: Ruth Sustaita
Deposited On:21 Nov 2014 20:52
Last Modified:03 Oct 2019 07:38

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