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Multifrequency observations of KAZ 102 during the ROSAT all-sky surveyThe bright quasar Kaz 102, which lies in the vicinity of the North Ecliptic Pole, was monitored during the ROSAT All Sky Survey for 121.5 days from 1990 July 30 to 1991 January 25. In the course of the survey, optical photometry with various filters was peformed at several epochs, together with UV (IUE) and optical spectrophotometry. The spectral energy distribution in the 3 x 10(exp 14) -3 x 10(exp 17) Hz range is obtained simultaneously among the various frequencies to less than or = 1 day. No clear case of variability can be made in the X-rays, while in the optical and UV variability of 10%-20% is apparent. An analysis of IUE and Einstein archives indicates a doubling timescale of years for the UV and soft X-ray flux. The X-ray photon index, which in 1979 was rather flat (Gamma = 0.8(+0.6 -0.4), in 1990/1991 was found to be Gamma = 2.22 +/- 0.13, a typical value for radio-quiet quasars in this energy range. The overall energy distribution and the variability are discussed.
Document ID
19950046436
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Treves, A.
(Scuola Internazionale Superiore di Studi Avanzati Trieste, Italy)
Fink, H. H.
(MPI fuer Extraterrestrische Physik Garching, Germany)
Malkan, M.
(Univ. of California, Los Angeles, CA United States)
Wilkes, B. J.
(Harvard-Smithonsian Center for Astrophysics, Cambridge, MA United States)
Baganoff, F.
(Univ. of California, Los Angeles, CA United States)
Heidt, J.
(Landessternwarte Heidelberg-Konistuhl Heidelberg, Germany)
Pian, E.
(Scuola Internazionale Superiore di Studi Avanzati Trieste, Italy)
Sadun, A.
(Agnes Scott College, Decatur, GA United States)
Schaeidt, S.
(MPI fuer Extraterrestrische Physik Garching, Germany)
Bonnell, J. T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Astrophysical Journal
Volume: 442
Issue: 2, Pa
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
95A78035
Distribution Limits
Public
Copyright
Other

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