High Resolution X-ray Imaging Of The Center Of IC 342

Details High Resolution X-ray Imaging Of The Center Of IC 342 High Resolution X-ray Imaging Of The Center Of IC 342

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114112m&link_type=abstract

American Astronomical Society, AAS Meeting #211, #141.12; Bulletin of the American Astronomical Society, Vol. 39, p.993

Astronomy and Astrophysics

Astronomy

Scientific paper

We presented the result of a high resolution 12 ks Chandra HRC-I observation of the starburst galaxy IC342 taken on 2 April 2006. We identified 23 X-ray sources within the central 30'×30' region of IC342. Our HRC-I observation resolved the historical Ultraluminous X-ray sources (ULX), X3, near the nucleus into 2 sources, namely C12 and C13, for the first time. The brighter source C12, with L0.08-10keV=(8.57±0.59)×1038 ergs-1, was spatially extended (≈82; pc×127; pc). From the astrometric registration of the X-ray image, C12 was closer to the nucleus than C13. Thus we concluded that source was not an ULX and must instead be associated with the nucleus. The fainter source C13, with L0.08-10keV=(5.1±1.4)×1037ergs-1 was consistent with a point source and located 6.51'' at P.A.≈240° of C12.
We also analyzed astrometrically corrected optical Hubble Space Telescope and radio Very Large Array images, a comparison with the X-ray image showed similarities in their morphologies. Regions of star formation within the central region of IC342 were clearly visible in HST Hα image and this was the region where 3 optical star clusters and correspondingly our detected X-ray source C12 were observed. We found that a predicted X-ray emission from starburst was very close to the observed X-ray luminosity of C12, suggesting that nuclear X-ray emission in IC342 was dominated by starburst. Furthermore, we discussed the possibility of AGN in the nucleus of IC342. Although our data was not enough to give a firm existence of an AGN, it could not be discarded.

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