Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20921113m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #211.13; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Massive clusters of galaxies are the earliest cosmic structures to form. Deep images show a strong overdensity of galaxies in the cluster as well as gravitationally lensed background field sources. We have observed Abell 1689, one of the most massive clusters in the nearby universe, using the Wide Field Camera and G800L grism of the Advanced Camera for Surveys onboard the Hubble Space Telescope. Here we present a catalog of Emission Line Galaxies (ELGs) identified in this field. This field is about 70% richer in ELGs compared to a "blank" field observed to a comparable depth. About half of the over density in ELGs results from H-alpha emitters at or near the cluster redshift. Background galaxies are also detected including a spectacular example of a strongly magnified galaxy displaying line emission over much of its distorted face. The ELGs are predominantly blue, although we do find some cases of line emitters on the Red Cluster Sequence. ACS was developed under NASA contract NAS5-32865, and this research was supported by NASA grant NAG5-7697.
Benítez Narciso
Coe Dan
Ford Holland C.
Frye Brenda L.
Gronwall Caryl
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