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26 April 2024 |
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A Chandra Study of the Circinus Galaxy Point-Source Population | | F. E. Bauer
; W. N. Brandt
; R. M. Sambruna
; G. Chartas
; G. P. Garmire
; S. Kaspi
; H. Netzer
; | | Date: |
3 Apr 2001 | | Subject: | astro-ph | | Affiliation: | 1,2), G. Chartas , G. P. Garmire , S. Kaspi , and H. Netzer ( Pennsylvania State University, George Mason University, and Tel-Aviv University | | Abstract: | We have used the Chandra X-ray Observatory to resolve spatially and spectrally the X-ray emission from the Circinus Galaxy. We report here on the nature of the X-ray emission from the off-nuclear point sources associated with the disk of Circinus. We find that many of the serendipitous X-ray sources are concentrated along the optical disk of the galaxy, but few have optical counterparts within 1" of their X-ray positions down to V=23-25. At 3.8 Mpc, their intrinsic 0.5-10 keV luminosities range from approx. 2E37 erg/s to 4E39 erg/s. One quarter of the sources are variable over the duration of the 67 ks observation, and spectral fitting of these off-nuclear sources shows a diverse range of spectral properties. The properties of the two strongest off-nuclear sources are remarkable, with average X-ray luminosities of 3.7E39 erg/s and 3.4E39 erg/s. The former displays large and periodic flux variations every 7.5 hr and is well fit by a multicolor blackbody accretion-disk model with T_in=1.35 keV, properties consistent with an eclipsing >50 M_sun black-hole binary. The latter appears to be a young supernova remnant, as it coincides with a non-thermal radio counterpart and an Halpha-detected HII region. This source exhibits both long-term (approx. 4 yr) X-ray variability and a 6.67-6.97 keV iron emission-line blend with a 1.6 keV equivalent width. These two objects further support the notion that super-Eddington X-ray sources in nearby galaxies can be explained by a mixture of intermediate-mass black holes in X-ray binaries and young supernova remnants. (abridged) | | Source: | arXiv, astro-ph/0104035 | | Services: | Forum | Review | PDF | Favorites | |
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