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Title:
Soft X-Ray Emission from the Spiral Galaxy NGC 1313
Authors:
Colbert, Edward J. M.; Petre, Robert; Schlegel, Eric M.; Ryder, Stuart D.
Publication:
Astrophysical Journal v.446, p.177 (ApJ Homepage)
Publication Date:
06/1995
Origin:
APJ; KNUDSEN
Astronomy Keywords:
GALAXIES: INDIVIDUAL NGC NUMBER: NGC 1313, GALAXIES: SPIRAL, STARS: SUPERNOVAE: INDIVIDUAL ALPHANUMERIC: SN 1978K, X-RAYS: GALAXIES
DOI:
10.1086/175777
Bibliographic Code:
1995ApJ...446..177C

Abstract

The nearby barred spiral galaxy NGC 1313 has been observed with the PSPC instrument on board the ROSAT X-ray satellite. Ten individual sources are found. Three sources (X-1, X-2, and X-3 [SN 1978K]) are very bright (˜1040 ergs s-1) and are unusual in that analogous objects do not exist in our Galaxy. We present an X-ray image of NGC 1313 and X-ray spectra for the three bright sources. The emission from the nuclear region (R ≲ 2 kpc) is dominated by source X-1, which is located 1 kpc north of the photometric (and dynamical) center of NGC 1313. Optical, far-infrared, and radio images do not indicate the presence of an active galactic nucleus at that position; however, the compact nature of the X-ray source (X-1) suggests that it is an accretion-powered object with central mass M ≳ 103 Msun. Additional emission (Lx 1039 ergs s-1) in the nuclear region extends out to ˜2.6 kpc and roughly follows the spiral arms. This emission is from four sources with luminosity of several × 1038 ergs s-1, two of which are consistent with emission from Population I sources (e.g., supernova remnants, and hot interstellar gas which has been heated by supernova remnants). The other two sources could be emission from Population II sources (e.g., low-mass X-ray binaries). The bright sources X-2 and SN 1978K are positioned in the southern disk of NGC 1313. X-2 is variable and has no optical counterpart brighter than 20.8 mag (V-band). It is likely that it is an accretion powered object in NGC 1313. The Type II supernova SN 1978K (Ryder et al. 1993) has become extraordinarily luminous in X-rays ˜13 yr after optical maximum.

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