Faint Field Galaxies from z ˜1 to 0.5 - New Merger Results from Keck AO and NIRC2

Details Faint Field Galaxies from z ˜1 to 0.5 - New Merger Results from Keck AO and NIRC2 Faint Field Galaxies from z ˜1 to 0.5 - New Merger Results from Keck AO and NIRC2

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.9411b&link_type=abstract

American Astronomical Society Meeting 205, #94.11; Bulletin of the American Astronomical Society, Vol. 36, p.1497

Physics

Optics

Scientific paper

We have used the Keck Adaptive Optics System and its wide-field, near-infrared imager (NIRC2) to image nearly 300 faint field galaxies at high spatial resolution (50 to 80 milliarcseconds). The imaged galaxies lie within the isoplanatic regions of several natural AO guide stars, and are as faint as H≈23 mag (Vega). In this sample, we find that over 20 companions within 2" (≤ 15 kpc at z ˜ 0.6). Within 0.5 - 1.0", there is a three-fold overdensity of companions compared to random galaxy fields. Moreover, the relative magnitude of the galaxy pairs indicates that all are likely to be minor merger events. Unlike related optical studies, we find no evidence for major merger activity in this sample.

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