X-ray properties of NGC 300

I. Global properties of X-ray point sources and their optical counterparts

¹ Institut für Astronomie und Astrophysik, Abteilung Astronomie, Universität Tübingen, Sand 1, 72076 Tübingen, Germany e-mail: carpano@astro.uni-tuebingen.de
² Department of Physics, University of Warwick, Coventry, CV4 7AL, UK
³ Institut für Astrophysik und Extraterrestrische Forschung, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
⁴ Isaac Newton Group of Telescopes, 38700 Santa Cruz de La Palma, Spain

Received: 12 October 2004
Accepted: 14 July 2005

Abstract

We present X-ray properties of NGC 300 point sources, extracted from 66 ks of XMM-Newton data taken in 2000 December and 2001 January. A total of 163 sources were detected in the energy range of 0.3–6 keV. We report on the global properties of the sources detected inside the D₂₅ optical disk, such as the hardness ratio and X-ray fluxes, and on the properties of their optical counterparts found in B, V, and R images from the 2.2 m MPG/ESO telescope. Furthermore, we cross-correlate the X-ray sources with SIMBAD, the USNO-A2.0 catalog, and radio catalogues.