Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461..198g&link_type=abstract
Astrophysical Journal v.461, p.198
Astronomy and Astrophysics
Astronomy
3
X-Rays: Galaxies, Galaxies: Bl Lacertae Objects: Individual Alphanumeric: Exo 055625-3838.6
Scientific paper
We report the results from observations of the BL Lac object EXO 055625 - 3838.6 carried out in the X-ray band using ROSAT and ASCA during 1993 and 1995. These observations provide the first X-ray spectra of the source obtained using image detectors. We find no evidence for dramatic variability within either observation, but find the source to have varied by a factor of ~1.5 in intensity between the two epochs. For both epochs we find the spectrum to be well described by a simple power-law model with a (photon) index {GAMMA} ~2.5, absorbed by an effective hydrogen column consistent with 21 cm measurements along the line of sight through our Galaxy. EXO 055625 - 3838.6 lies within the error box of the target designated H0557 - 385, ~25' south of the Seyfert 1 Galaxy included in the X-ray log N-log S and luminosity function derived from HEAO1 data (Piccinotti et al. 1982). However, based upon the results presented here, we suggest the BL Lac object probably did not contribute significantly to earlier hard X-ray observations made using collimated instruments.
George Ian Michael
Turner Tracey Jane
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