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Title:
The ATLAS3D project - XVII. Linking photometric and kinematic signatures of stellar discs in early-type galaxies
Authors:
Krajnovic, Davor; Alatalo, Katherine; Blitz, Leo; Bois, Maxime; Bournaud, Frédéric; Bureau, Martin; Cappellari, Michele; Davies, Roger L.; Davis, Timothy A.; de Zeeuw, P. T.; Duc, Pierre-Alain; Emsellem, Eric; Khochfar, Sadegh; Kuntschner, Harald; McDermid, Richard M.; Morganti, Raffaella; Naab, Thorsten; Oosterloo, Tom; Sarzi, Marc; Scott, Nicholas; Serra, Paolo; Weijmans, Anne-Marie; Young, Lisa M.
Affiliation:
AA(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany; ), AB(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA), AC(Department of Astronomy and Radio Astronomy Laboratory, University of California, Berkeley, CA 94720, USA), AD(Observatoire de Paris, LERMA and CNRS, 61 Av. de l'Observatoire, F-75014 Paris, France), AE(Laboratoire AIM Paris-Saclay, CEA/IRFU/SAp CNRS Université Paris Diderot, F-91191 Gif-sur-Yvette Cedex, France), AF(Sub-department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), AG(Sub-department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), AH(Sub-department of Astrophysics, Department of Physics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), AI(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany), AJ(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany; Sterrewacht Leiden, Leiden University, Postbus 9513, NL-2300 RA Leiden, the Netherlands), AK(Laboratoire AIM Paris-Saclay, CEA/IRFU/SAp CNRS Université Paris Diderot, F-91191 Gif-sur-Yvette Cedex, France), AL(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany; Université Lyon 1, Observatoire de Lyon, Centre de Recherche Astrophysique de Lyon and Ecole Normale Supérieure de Lyon, 9 avenue Charles André, F-69230 Saint-Genis Laval, France), AM(Max Planck Institut für extraterrestrische Physik, PO Box 1312, D-85478 Garching, Germany), AN(European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748 Garching bei München, Germany), AO(Gemini Observatory, Northern Operations Centre, 670 N. A'ohoku Place, Hilo, Hawaii 96720, USA), AP(Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands; Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands), AQ(Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-strasse 1, D-85741 Garching, Germany), AR(Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands; Kapteyn Astronomical Institute, University of Groningen, Postbus 800, NL-9700 AV Groningen, the Netherlands), AS(Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts AL1 09AB), AT(Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Vic 3122, Australia), AU(Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, NL-7990 AA Dwingeloo, the Netherlands), AV(Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St George Street, Toronto, Canada), AW(Department of Physics, New Mexico Institute of Mining and Technology, Socorro, NM 87801, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 432, Issue 3, p.1768-1795 (MNRAS Homepage)
Publication Date:
07/2013
Origin:
OUP
Astronomy Keywords:
galaxies: elliptical and lenticular, cD, galaxies: bulges, galaxies: kinematics and dynamics, galaxies: structure
Abstract Copyright:
2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
DOI:
10.1093/mnras/sts315
Bibliographic Code:
2013MNRAS.432.1768K

Abstract

We analyse the morphological structures in galaxies of the ATLAS3D sample by fitting a single Sérsic profile and decomposing all non-barred objects (180 of 260 objects) in two components parametrized by an exponential and a general Sérsic function. The aim of this analysis is to look for signatures of discs in light distributions of nearby early-type galaxies and compare them to kinematic properties. Using Sérsic index from single-component fits for a distinction between slow and fast rotators, or even late- and early-type galaxies, is not recommended. Assuming that objects with n > 3 are slow rotators (or ellipticals), there is only a 22 per cent probability to correctly classify objects as slow rotators (or 37 per cent of previously classified as ellipticals). We show that exponential sub-components, as well as light profiles fitted with only a single component of a low Sérsic index, can be linked with the kinematic evidence for discs in early-type galaxies. The median disc-to-total light ratio for fast and slow rotators is 0.41 and 0.0, respectively. Similarly, the median Sérsic indices of the bulge (general Sérsic component) are 1.7 and 4.8 for fast and slow rotators, respectively. Overall, discs or disc-like structures are present in 83 per cent of early-type galaxies which do not have bars, and they show a full range of disc-to-total light ratios. Discs in early-type galaxies contribute with about 40 per cent to the total mass of the analysed (non-barred) objects. The decomposition into discs and bulges can be used as a rough approximation for the separation between fast and slow rotators, but it is not a substitute, as there is only a 59 per cent probability to correctly recognize slow rotators. We find trends between the angular momentum and the disc-to-total light ratios and the Sérsic index of the bulge, in the sense that high angular momentum galaxies have large disc-to-total light ratios and small bulge indices, but there is none between the angular momentum and the global Sérsic index. We investigate the inclination effects on the decomposition results and confirm that strong exponential profiles can be distinguished even at low inclinations, but medium-size discs are difficult to quantify using photometry alone at inclinations lower than ˜50°. Kinematics (i.e. projected angular momentum) remains the best approach to mitigate the influence of the inclination effects. We also find weak trends with mass and environmental density, where disc-dominated galaxies are typically less massive and found at all densities, including the densest region sampled by the ATLAS3D sample.

Associated Articles

Part  1     Part  3     Part  4     Part  5     Part  2     Part  6     Part  7     Part  8     Part  9     Part 10     Part 11     Part 13     Part 12     Part 14     Part 15     Part 16     Part 17     Part 18     Part 19     Part 20     Part 21     Part 22     Part 23    


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