Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21944019s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #440.19
Astronomy and Astrophysics
Astronomy
Scientific paper
Super Groups (SG) facilitate our understanding of filament-cluster core interaction at a different dynamical scale as compared to a more evolved and relaxed system like the Coma Cluster. We study 279 spectroscopically confirmed members of a highly filamentary-type SG, Abell 1882 (redshift ≈ 0.1365), which is composed of groups caught just before coalescing into a rich cluster.
We have probed the effects of environment on Star Formation Rate and Star Formation History of the member galaxies for the first time, using multi-band data from SDSS, GALEX and SPITZER, as they are first pre-processed in the filaments in the super-cluster environment, then in the intermediate region where galaxies make a transition from filament environment to Super Group environment, and finally in the deeper, denser recesses of Super Group potential of Abell 1882.
From the preliminary study, there is an indication that the star-forming dwarf galaxies (Mass(star) < 1010 Mass(sun) and with 24 micron emission) exhibit a higher level of clumpiness as they approach the high density group environment. This strongly indicates enhanced star formation and disturbed morphology due to mergers/interactions at least for the shallower potentials.We also detect an over-density of red galaxies in the apparent filaments which are at the high density region of the Super Group.
SGs are rare at low redshifts, and coupled with its poor X-Ray emitting atmosphere, Abell 1882 offers us a very efficient system to study the individual galaxies and their evolution within the ICM.
Keel William
Morrison Glenn
Sengupta Aparajita
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