Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.273..450a&link_type=abstract
Nature, vol. 273, June 8, 1978, p. 450-453. NSF-supported research;
Astronomy and Astrophysics
Astronomy
63
Astrometry, Quasars, Spectrophotometry, X Ray Sources, Energy Spectra, Extragalactic Radio Sources, Radio Astronomy, Seyfert Galaxies, Ultraviolet Spectra, Visual Photometry
Scientific paper
The faint (1.8 micro Jy, 2-11 keV) X-ray QSO 4U0241+61 is considered in terms of its celestial position (galactic latitude = +2.4 plus or minus 30 sec), luminosity (Mv = -25.8 plus or minus 1.8), redshift (z = 0.0438), and radio emission (0.2-0.5 Jy). Counting rates in two energy channels are presented, and found comparable to the Type 1 Seyfert 3C120. Spectrophotometric calibration to an approximately 8 A resolution was also achieved. Attention is given to the close relation between X-ray emitting QSOs and Seyferts.
Apparao Krishna M. V.
Bignami Giovanni F.
Bradt Hale V.
Dower R. G.
Helmken H.
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