SIMBAD references

D. Pooley and W. H. G. Lewin, Massachusetts Institute of Technology, on behalf of a larger collaboration, report the detection of x-ray emission from SN 2002hh with the Chandra x-ray observatory: "A 30000-s ACIS-S3 observation on Nov. 25.36 UT revealed a source at R.A. = 20h34m44s.24, Decl. = +60o07'19".3 (equinox 2000.0; ± 0".5 in each coordinate), in close agreement with the reported optical and radio positions. A previous Chandra observation of NGC 6946 on 2001 Sept. 7 (60000 s with ACIS-S3) shows that no x-ray source was present at this location to a 3- sigma limiting flux of roughly 7 x 10**-16 erg s**-1 cm**-2 in the band 0.4-8 keV, corresponding to a limiting luminosity of 3 x 10**36 erg/s for a distance of 6.3 Mpc (Tully 1988, Nearby Galaxies Catalog, using H_0 = 65 km/s/Mpc). Preliminary spectral fits to the recent Chandra data (with both MEKAL and power-law models) indicate a rather hard, highly absorbed spectrum (as expected from the high reddening reported on IAUC 8007), with a fitted column density of N_H = 10**22 cm**-2 (compared to N_H = 2-3 x 10**21 cm**-2 reported for just NGC 6946 by Burstein and Heiles 1984, Ap.J. Suppl. 54, 33). The power-law photon index is found to be 0.6, but the MEKAL temperature could not be accurately measured because the data prefer a value of kT above 80 keV, which is the model limit. The unabsorbed 0.4-8-keV luminosity calculated from both models agrees well and is 5 x 10**38 erg/s. This low x-ray luminosity supports the indication on IAUC 8018 that there is little circumstellar interaction taking place."