ROSAT HRI INVESTIGATION OF THE NGC 507 X-RAY HALO

摘要: We present an X-ray investigation of the elliptical galaxy NGC 507 in Pisces cluster. make use archival ROSAT HRI and Chandra data, previously published PSPC to connect large-scale structure halo core morphology. Our analysis, based on a bidimensional double beta model surface brightness, shows that (r 3re) are characterized by different dynamical properties suggests origin two components. The has complex morphology with main emission peak, coincident center optical galaxy, several secondary peaks. spatial spectral analysis central peak this feature is produced denser hot gas core. While both homogeneous inhomogeneous cooling flow models predict deposited mass exceeding observed amount, our data support scenario which kinetically heated stellar losses. Comparison studies extended associated distribution similar halos compact galaxies. peaks due instead interactions between radio-emitting plasma surrounding ISM, producing density fluctuations gas. find energy input radio source ISM large enough prevent may explain failure models. total profile derived from significant amount dark matter at radii. extends cluster scales likely whole rather than 507. This typical many X-ray-bright early-type galaxies differences largely debated literature. brightness irregular more northeast direction. displacement filamentary structures further suggest be slowly moving within group potential. Finally, we found ~20% sources detected Kim & Fabbiano point sources, while nature remaining population not clear. If 507, they could either accreting binaries hosting massive black hole or clumps halo.