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Dynamically Close Pairs of Galaxies Selected in the NIR

Published online by Cambridge University Press:  17 July 2013

Ryan C. Keenan ,
Sebastien Foucaud ,
Roberto De Propris  and
Jing-Hua Lin
Ryan C. Keenan
Affiliation:
Academia Sinica Institute for Astronomy & Astrophysics, Taipei, Taiwan
Sebastien Foucaud
Affiliation:
National Taiwan Normal University, Department of Earth Sciences, Taipei, Taiwan
Roberto De Propris
Affiliation:
Cerro Tololo Inter-American Observatory, La Serena, Chile European Southern Observatory, Santiago, Chile
Jing-Hua Lin
Affiliation:
Academia Sinica Institute for Astronomy & Astrophysics, Taipei, Taiwan National Taiwan University, Graduate Institute of Astrophysics, Taipei, Taiwan
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Abstract

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Studies of dynamically close pairs of galaxies can serve as a powerful probe of the galaxy merger rate and its evolution. Here we present a large sample of dynamically close pairs of galaxies selected in the K-band from the UKIDSS LAS. These data span ~ 175 deg2 on the sky in the 2dFGRS equatorial region (10h < RA < 14h). Combining the 2dFGRS redshifts with those from the SDSS, our K-band selected catalog is > 90% spectroscopically complete at KAB < 16.4. In this study, we focus on quantifying the relative contributions of wet, dry, and mixed mergers to the stellar mass buildup of galaxies over the past 1-2 Gyr.

Keywords

GalaxiesMergersNear-Infrared
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 187
Copyright
Copyright © International Astronomical Union 2013