Upper limits from hard X-ray observations of five BL Lacertae objects

Details Upper limits from hard X-ray observations of five BL Lacertae objects Upper limits from hard X-ray observations of five BL Lacertae objects

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334..995b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 334, Nov. 15, 1988, p. 995-1000. DFG-supported research.

Astronomy and Astrophysics

Astronomy

4

Accretion Disks, Bl Lacertae Objects, X Ray Astronomy, X Ray Spectra, Electron Energy, Heao 1, Quasars, Seyfert Galaxies, X Ray Sources

Scientific paper

The authors report the results of HEAO 1 hard X-ray observations of the five brightest X-ray BL Lacertae objects: PKS 0548-322, Mrk 421, 2A 1219+305, Mrk 501 and PKS 2155-304. The observations covered the energy range 15 - 165 keV and the time span of 1977 August to 1978 December. No detections were made at the 3σ level for any objects, and 2σ upper limits to the inferred flux in six broad energy bands are given. A comparison of these limits with published results shows that Mrk 421 varies considerably on time scales of years in its hard component. Similarly large variations are indicated for PKS 2155-304.

Affiliated with

Also associated with

No associations

Rating

Upper limits from hard X-ray observations of five BL Lacertae objects 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 Upper limits from hard X-ray observations of five BL Lacertae objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Upper limits from hard X-ray observations of five BL Lacertae objects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1825790