Journal Article

<i>XMM—Newton</i> observation of the X-ray point source population of the starburst galaxy IC 342

Albert K. H. Kong

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 346, issue 1, pages 265-272
Published in print November 2003 | ISSN: 0035-8711
Published online November 2003 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1046/j.1365-2966.2003.07086.x
XMM—Newton observation of the X-ray point source population of the starburst galaxy IC 342

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Abstract

We present the results of an XMM–Newton observation of the starburst galaxy IC 342. Thirty-seven X-ray point sources were detected down to a luminosity limit of ∼1037 erg s−1. Most of the sources are located near the spiral arms. The X-ray point source luminosity function is consistent with a power-law shape with a slope of 0.55, typical of starburst galaxies. We also present the energy spectra of several ultraluminous X-ray sources (ULXs), including the luminous X-ray source in the galactic nucleus. Except for the nucleus and a luminous supersoft X-ray source, other ULXs can generally be fitted with a simple power-law spectral model. The nucleus is very luminous (∼1040 erg s−1 in 0.2–12 keV) and requires disc blackbody and power-law components to describe the X-ray emission. The spectral fit reveals a cool accretion disc (kT= 0.11 keV) and suggests that the source harbours either an intermediate-mass black hole or a stellar-mass black hole with outflow.

Keywords: galaxies: individual: IC 342; galaxies: starburst; X-rays: binaries; X-rays: galaxies

Journal Article.  4840 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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