Discovery of a variable broad absorption line in the BL Lac object PKS B0138-097
نویسندگان
چکیده
منابع مشابه
ISO observations of the BL Lac object PKS 2155 – 304 ⋆
The BL Lacertae object PKS 2155–304 was observed by the Infrared Space Observatory in May and June 1996, during a multiwavelength campaign. These are the first observations in the mid– and far–infrared bands since IRAS. In the observing period, the source showed no detectable time variability at 4.0, 14.3, 60 and 90 μm. The spectrum from 2.8 to 100 μm is well fitted by a single power law with e...
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We present the analysis of archival data from ROSAT and ASCA of a serendipitous BL Lac object PKS 2316-423. Because of its featureless non-thermal radio/optical continuum, PKS 2316-423 has been called as a BL Lac candidate in the literature. PKS 2316-423 was evidently variable over the multiple X-ray observations, in particular, a variable high-energy tail of the synchrotron radiation is reveal...
متن کاملMultiband optical polarimetry of the BL Lac object PKS 2155 – 304
Multiband optical polarimetry of the BL Lac object PKS 2155–304. Intranight and long term variability. ABSTRACT The polarized and total flux of the BL Lac object PKS 2155–304 were monitored intensively and simultaneously in the optical UBVRI bands with the Turin photopo-larimeter at the CASLEO 2.15 m telescope during 4 campaigns in June, August, Novem-ber 1998 and August 1999. The effective obs...
متن کاملExtended X - ray emission from the BL Lac object PKS 0521 − 365
Models that seek to unify BL Lacs and low-power radio galaxies predict that the two types of object should show similar isotropically emitted X-ray emission. Testing this is usually limited by difficulties in separating strong X-ray emission from a BL Lac nucleus and surrounding low-surface brightness emission. In this paper we report ROSAT HRI observations of the z = 0.055 BL Lac object PKS 05...
متن کاملModeling the Variability of the Bl Lacertae Object Pks 21552304
The bright X-ray–selected BL Lacertae object PKS 21552304 has been the target of two intense multiwavelength campaigns: in 1991 November and in 1994 May. Although the spectral energy distributions at both epochs were quite similar, the source exhibited two very distinct variability patterns that cannot be easily reconciled with homogeneous, one-zone jet models. During the first epoch the variab...
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ژورنال
عنوان ژورنال: Research in Astronomy and Astrophysics
سال: 2011
ISSN: 1674-4527
DOI: 10.1088/1674-4527/11/10/005