Deprojecting the quenching of star formation in and near clusters

Deprojecting the quenching of star formation in and near clusters (2011) . Edited by Ferreras, Ignacio and Pasquali, Anna. 2nd JENAM Symposium: Environment and the Formation of Galaxies: 30 Years Later, 6 September 2010 through 10 September 2010, Lisbon Portugal.

Title of proceedings Deprojecting the quenching of star formation in and near clusters
Editor Ferreras, Ignacio
Pasquali, Anna
Conference name 2nd JENAM Symposium: Environment and the Formation of Galaxies: 30 Years Later
Conference location Lisbon Portugal
Conference dates 6 September 2010 through 10 September 2010
ISBN 978-3-642-20284-1
978-3-642-20285-8
ISSN 1570-6591
1570-6605
Place published Dordrecht Netherlands
Publisher Springer Netherlands
Publication date 2011
Author Mamon, G. A.
Mahajan, S.
Raychaudhury, S.
Start page 135
End page 140
Total pages 6
Language eng
Formatted Abstract/Summary
Using Hδ and D n 4000 as tracers of recent or ongoing efficient star formation, we analyze the fraction of SDSS galaxies with recent or ongoing efficient star formation (GORES) in the vicinity of 268 clusters. We confirm the well-known segregation of star formation, and using Abel deprojection, we find that the fraction of GORES increases linearly with physical radius and then saturates. Moreover, we find that the fraction of GORES is modulated by the absolute line-of-sight velocity (ALOSV): at all projected radii, higher fractions of GORES are found in higher ALOSV galaxies. We model this velocity modulation of GORES fraction using the particles in a hydrodynamical cosmological simulation, which we classify into virialized, infalling and backsplash according to their position in radial phase space at z = 0. Our simplest model, where the GORES fraction is only a function of class does not produce an adequate fit to our observed GORES fraction in projected phase space. On the other hand, assuming that in each class the fraction of GORES rises linearly and then saturates, we are able to find well-fitting 3D models of the fractions of GORES. In our best-fitting models, in comparison with 18% in the virial cone and 13% in the virial sphere, GORES respectively account for 34% and 19% of the infalling and backsplash galaxies, and as much as 11% of the virialized galaxies, possibly as a result of tidally induced star formation from galaxy-galaxy interactions. At the virial radius, the fraction of GORES of the backsplash population is much closer to that of the virialized population than to that of the infalling galaxies. This suggests that the quenching of efficient star formation is nearly complete in a single passage through the cluster.
Keyword Galaxy Clusters
Dependence
Region
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Conference Proceedings
Collection: School of Mathematics and Physics
 
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