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A Potential Galaxy Threshing System in the Cosmos Field

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arxiv astro-ph/0612351 v1 pith:ZRNKN45F submitted 2006-12-13 astro-ph

A Potential Galaxy Threshing System in the Cosmos Field

classification astro-ph
keywords galaxysystemapproxredshiftthreshingcosmosellipticalfield
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report on the discovery of a new potential galaxy threshing system in the COSMOS 2 square degree field using the prime-focus camera, Suprime-Cam, on the 8.2 m Subaru Telescope. This system consists of a giant elliptical galaxy with $M_V \approx -21.6$ and a tidally disrupted satellite galaxy with $M_V \approx -17.7$ at a photometric redshift of $z \approx 0.08$. This redshift is consistent with the spectroscopic redshift of 0.079 for the giant elliptical galaxy obtained from the Sloan Digital Sky Survey (SDSS) archive. The luminosity masses of the two galaxies are $3.7 \times 10^{12} \cal{M}_{\odot}$ and $3.1 \times 10^{9} \cal{M}_{\odot}$, respectively. The distance between the two galaxies is greater than 100 kpc. The two tidal tails emanating from the satellite galaxy extend over 150 kpc. This system would be the second well-defined galaxy threshing system found so far.

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