Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253...19b&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 1, 1982, p. 19-27.
Astronomy and Astrophysics
Astronomy
34
Astronomical Spectroscopy, Bl Lacertae Objects, Infrared Spectra, Radio Sources (Astronomy), Ultraviolet Spectra, Visible Spectrum, X Ray Sources, Galactic Radiation, Radiant Flux Density, Synchrotron Radiation
Scientific paper
Two sets of simultaneous spectra consisting of data obtained with radio, IR, optical, UV and X-ray telescopes were obtained 10 months apart for the X-ray bright BL Lac object IZw 187. In addition, nonsimultaneous observations were made in several of the aforementioned observing bands in order to detect flux variations and galactic light contamination was removed from all observations. The BL Lac component is found to have a weak 3000 A bump superposed on an IR-optical-UV spectrum of slope 0.9. Consistent with the arising of the IR-through-X-ray continuum from a single synchrotron source, the X-ray data fall on or near an extrapolation of this power law. No flux variations have been detected in the flat radio spectrum. Optical and X-ray fluxes are observed to vary by a factor not greater than three, and the shortest variability time scales in these bands are comparable at about one week.
Aller Hugh D.
Aller Margo F.
Balonek Thomas J.
Brand Peter W. J. L.
Bregman Joel N.
No associations
LandOfFree
Simultaneous observations of the BL Lacertae object I ZW 187 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simultaneous observations of the BL Lacertae object I ZW 187, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simultaneous observations of the BL Lacertae object I ZW 187 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1646668