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Multiwavelength Observations of a Dramatic High Energy Flare in the Blazar 3C 279
A. E. Wehrle, E. Pian, C. M. Urry +3
The blazar 3C 279, one of the brightest identified extragalactic objects in the gamma-ray sky, underwent a flare of a factor 10 amplitude in gamma-rays towards the end of a 3-week…
High Energy Break and Reflection Features in the Seyfert Galaxy MCG+8-11-11
P. Grandi, F. Haardt, G. Ghisellini +3
We present the results from ASCA and OSSE simultaneous observations of the Seyfert 1.5 galaxy MCG+8-11-11 performed in August-September 1995. The ASCA observations indicate a modes…
BeppoSAX Observations of Unprecedented Synchrotron Activity in the BL Lac Object Mkn 501
Elena Pian, Giuseppe Vacanti, Gianpiero Tagliaferri +9
The BL Lac object Mkn 501, one of the only three extragalactic sources (with Mkn 421 and 1ES 2344+514) so far detected at TeV energies, was observed with the BeppoSAX satellite on…
Monitoring Ly alpha Emission from the Blazar 3C 279
Anuradha Koratkar, Elena Pian, C. Megan Urry +1
The blazar 3C 279 is well studied and shows frequent large continuum flares from radio to gamma-ray wavelengths. There have been a number of multi-wavelength observations of 3C 279…
Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. II. The IUE Campaign
Elena Pian, C. Megan Urry, Aldo Treves +16
PKS 2155-304, the brightest BL Lac object in the ultraviolet sky, was monitored with the IUE satellite at ~1 hour time-resolution for ten nearly uninterrupted days in May 1994. The…
Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. I. The Ground-Based Campaign
J. E. Pesce, C. M. Urry, L. Maraschi +29
Optical, near-infrared, and radio observations of the BL Lac object PKS2155-304 were obtained simultaneously with a continuous UV/EUV/X-ray monitoring campaign in 1994 May. Further…
Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. III. Probing the Inner Jet through Multiwavelength Correlations
C. Megan Urry, A. Treves, L. Maraschi +16
In May 1994 the BL Lac object PKS 2155-304 was observed continuously for ~10 d with IUE and EUVE and for 2 d with ASCA, as well as with ROSAT and with ground- based radio, IR, and…
Multiwavelength Properties of Blazars
C. Megan Urry
The multiwavelength spectra of blazars appear to be dominated by nonthermal emission from a relativistic jet oriented close to the line of sight. The recent detection of many blaza…
Multi-wavelength Observations of 3C 273 in 1993-1995
C. von Montigny
We present the results of the multi-wavelength campaigns on 3C 273 in 1993-1995. During the observations in late 1993 this quasar showed an increase of its flux for energies greate…
Achromatic variability in the BL Lac object PKS 2155-304. A case for microlensing?
A. Treves, F. Rovetti, Ph. Jetzer +1
PKS 2155-304 is the only BL Lac object for which well-sampled multiwavelength light curves resolve the intraday variability at UV and X-ray wavelengths. In particular we focus on t…