A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups

Details A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups

2010-11-29

arxiv.org/abs/1011.6382v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 2 figures, accepted for publication in MNRAS

Scientific paper

We present the results of a panoramic (15 Mpc-scale) survey of the Cl0016+16 supercluster (z=0.55) using Spitzer Space Telescope MIPS 24um and Galaxy Evolution Explorer near-UV (2500A; NUV) imaging. The supercluster regions probed are characterised by several dense nodes connected by a pronounced intermediate-density filamentary structure. We have studied the mid-IR and NUV properties of potential cluster members within a Dz=0.1 photometric redshift slice, compared to an identical blank field selection. We have two main findings: (a) the star-formation rates of individual star-forming galaxies throughout the cluster are not significantly different to identically selected field galaxies, and (b) the cluster harbours pockets of 'accelerated' activity where galaxies have an enhanced probability of undergoing star formation. This observation could be explained in a simple model of 'pre-processing' of galaxies during cluster infall: galaxies in satellite groups have an increased chance of having star-formation triggered via gravitational tidal interactions compared to their counterparts in the field, but there is no environmental mechanism boosting the individual star-formation rates of galaxies. We estimate a lower-limit for the total star-formation rate of galaxies in the supercluster as ~850 Msun/yr (field corrected). If this rate is maintained over the typical infall time of a few Gyr, then the infall population could contribute ~1-2x10^12 Msun of stellar mass to the structure.

Affiliated with

Also associated with

No associations

Rating

A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A GALEX/Spitzer survey of the Cl0016+16 supercluster at z=0.55: acceleration of the onset of star-formation in satellite groups will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-444022