Hostname: page-component-7c8c6479df-hgkh8 Total loading time: 0 Render date: 2024-03-28T21:42:46.271Z Has data issue: false hasContentIssue false

Revealing the origin of the cold ISM in massive early-type galaxies

Published online by Cambridge University Press:  17 July 2013

T. A. Davis
Affiliation:
ESO, Germany
K. Alatalo
Affiliation:
UC Berkeley, USA
M. Bureau
Affiliation:
Univ. Oxford, UK
L. Young
Affiliation:
New Mexico Tech, USA
L. Blitz
Affiliation:
UC Berkeley, USA
A. Crocker
Affiliation:
Univ. Toledo, USA
E. Bayet
Affiliation:
Univ. Oxford, UK
M. Bois
Affiliation:
Observatoire de Paris, France
F. Bournaud
Affiliation:
Univ. Paris Diderot, France
M. Cappellari
Affiliation:
Univ. Oxford, UK
R. L. Davies
Affiliation:
Univ. Oxford, UK
P-A. Duc
Affiliation:
Univ. Paris Diderot, France
P. T. de Zeeuw
Affiliation:
ESO, Germany Leiden Univ., The Netherlands
E. Emsellem
Affiliation:
ESO, Germany Univ. de Lyon, France
J. Falcon-Barroso
Affiliation:
IAC, Spain
S. Khochfar
Affiliation:
MPE, Germany
D. Krajnovic
Affiliation:
ESO, Germany
H. Kuntschner
Affiliation:
ESO, Germany
P.-Y. Lablanche
Affiliation:
ESO, Germany
R. M. McDermid
Affiliation:
Gemini Observatory, USA
R. Morganti
Affiliation:
ASTRON, The Netherlands
T. Naab
Affiliation:
MPA, Germany
M. Sarzi
Affiliation:
Univ. Hertfordshire, UK
N. Scott
Affiliation:
Swinburne Univ., Australia
P. Serra
Affiliation:
ASTRON, The Netherlands
A. Weijmans
Affiliation:
Univ. Toronto, Canada
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Recently, massive early-type galaxies have shed their red-and-dead moniker, thanks to the discovery that many host residual star formation. As part of the ATLAS-3D project, we have conducted a complete, volume-limited survey of the molecular gas in 260 local early-type galaxies with the IRAM-30m telescope and the CARMA interferometer, in an attempt to understand the fuel powering this star formation. We find that around 22% of early-type galaxies in the local volume host molecular gas reservoirs. This detection rate is independent of galaxy luminosity and environment. Here we focus on how kinematic misalignment measurements and gas-to-dust ratios can be used to put constraints on the origin of the cold ISM in these systems. The origin of the cold ISM seems to depend strongly on environment, with misaligned, dust poor gas (indicative of externally acquired material) being common in the field but completely absent in rich groups and in the Virgo cluster. Very massive galaxies also appear to be devoid of accreted gas. This suggests that in the field mergers and/or cold gas accretion dominate the gas supply, while in clusters internal secular processes become more important. This implies that environment has a strong impact on the cold gas properties of ETGs.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013 

References

Bregman, J. N.Parriott, J. R., 2009, ApJ, 699, 923CrossRefGoogle Scholar
Cappellari, M., et al., 2011, MNRAS, 413, 813CrossRefGoogle Scholar
Davis, T. A.et al. 2011, MNRAS, 417, 882Google Scholar
Faber, S.et al. 2007, ApJ, 665, 265Google Scholar
Kannappan, S. J., Guie, J. M., & Baker, A. J. 2009, AJ, 138, 579Google Scholar
Kaviraj, S., Tan, K.-M., Ellis, R. S., & Silk, J. 2011, MNRAS, 411, 2148CrossRefGoogle Scholar
Kuntschner, H., et al., 2010, MNRAS, 408, 97CrossRefGoogle Scholar
Parriott, J. R.Bregman, J. N., 2008, ApJ, 681, 1215CrossRefGoogle Scholar
Serra, P.et al. 2012, MNRAS, 422, 1835CrossRefGoogle Scholar
Yi, S. K., et al., 2005, ApJ, 619, L111CrossRefGoogle Scholar
Young, L. M., et al., 2011, MNRAS, 414, 940CrossRefGoogle Scholar