Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21914001b&link_type=abstract
American Astronomical Society, AAS Meeting #219, #140.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We present Spitzer Infrared Spectrograph (IRS) observations of the Ultra-luminous X-ray source (ULX) in NGC 6946 and its associated nebula MF16. This ULX has very similar properties to the famous Holmberg II ULX. Like Holmberg II, the mid-IR ratios of the [O IV] to lower ionization lines are similar to those observed in AGN, suggesting that a strong UV and X-ray source is responsible for the photoionization. The best Chandra data is used to model the X-ray band and this data is then extrapolated into the UV. We use previously published UV and optical observations to construct the SED for the ULX and its companion. We use CLOUDY photoionization modeling to discriminate between the different ULX models and the observed IR line ratios. The simulations are consistent with a rather thin shell of ionized gas that is also seen in the optical and UV images. Our results suggest that the emission from the accretion disk only dominates the far UV and the X-ray emission. The optical companion is likely responsible for most of the near UV emission, and is consistent with an O supergiant. The irradiated accretion disk can also contribute significantly to the optical emission.
Berghea Ciprian T.
Dudik Rachel P.
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