An Unusual Discontinuity in the X-ray Surface Brightness Profile of NGC 507: Evidence of an Abundance Gradient?

Abstract

We present results from a 45 ks Chandra/ACIS-I observation of the nearby ($z=0.01646$) NGC 507 group. The X-ray surface brightness profile of the outer region of the group is well described by an isothermal $\beta$-profile consistent with earlier ROSAT observations. We find a sharp edge or discontinuity in the radial surface brightness profile 55 kpc E and SE of NGC 507 covering a $\sim 125^{\circ }$ arc. At the sharpest part of the discontinuity, the surface brightness declines by a factor of $\sim$2 over a distance of 6.9 kpc ($\sim 15^{\prime \prime }$). The inner and outer gas temperatures across the discontinuity differ by only about 0.2 keV (interior and exterior gas temperatures are 1.2 and 1.3 keV, respectively). Spectral analysis indicates that there is a large gradient in the elemental abundance across the discontinuity, and comparison with the low resolution NVSS radio maps suggests that the discontinuity is aligned with a low surface brightness radio lobe. We conclude that the appearance of this discontinuity is the result of the transport of high abundance material from the center of the galaxy by the expanding radio lobe, similar to structures seen in {\em Chandra} observations of Perseus A and Hydra A.

arXiv comment15 pages, 6 figures, submitted to Astrophysical Journal Letters

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