Multifrequency Observations of BL Lacertae in 1988
Abstract
Simultaneous multiwavelength observations of BL Lacertae were performed on two occasions separated by 1 month in 1988 June and July, covering the radio, submillimeter, infrared, optical, ultraviolet, and X- ray wave bands. In the wide-band photon spectra, the X-ray flux lies clearly above the extension of radio-ultraviolet continuum as expected. The slope of the X-ray spectra is significantly flatter than that at optical-ultraviolet regimes, and its spectral index 0.7-1.0 corresponds to the slope at submillimeter band. Comparison with earlier observations, in fact, indicates that the X-ray flux is correlated with the submillimeter band, and not with the others, and supports the SSC model.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1991
- DOI:
- 10.1086/170737
- Bibcode:
- 1991ApJ...382..508K
- Keywords:
-
- Active Galactic Nuclei;
- Astronomical Spectroscopy;
- Bl Lacertae Objects;
- X Ray Spectra;
- Astronomical Models;
- Astronomical Satellites;
- Linear Polarization;
- Radio Sources (Astronomy);
- Spaceborne Astronomy;
- Astrophysics;
- BL LACERTAE OBJECTS;
- INFRARED: SOURCES;
- RADIATION MECHANISMS;
- RADIO SOURCES: VARIABLE;
- X-RAYS: SPECTRA