Environment, Kinematics, & Star Formation History of Infalling [OII] Emitters in z=0.4 cluster Abell 851

Details Environment, Kinematics, & Star Formation History of Infalling [OII] Emitters in z=0.4 cluster Abell 851 Environment, Kinematics, & Star Formation History of Infalling [OII] Emitters in z=0.4 cluster Abell 851

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20912903s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #129.03; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Rich cluster A851 presents filamentary structures along which the galaxies may be accreted. We selected cluster [OII] emitters to i < 23 and r = 2 Mpc, using narrowband [OII]3727 imaging, and followed up spectroscopically using Keck LRIS & DEIMOS. We find that typical [OII] emitters are dusty starbursts with decay timescales of < 1 Gyr, with the frequency of bursts comparable or higher than z 1 field galaxies. Their kinematics suggests they are accreted to the cluster only recently and tend to reside in the infall groups. We conclude the starbursts are likely triggered in the infall groups via galaxy-galaxy interactions, which could be enhanced due to the dynamically active state of the cluster. There is also a hint of differential evolution between dwarfs and giant [OII] emitters in the densest environments. We also present the preliminary results from our ongoing work using bulge-dominated cluster galaxies to constrain the feedback effect of enhanced AGN/starburst activities on the cluster-scale properties as observed in such well-known X-ray scaling relations as the Lx-T relation.

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