The redshift of the highly variable BL Lac object H0323+022
نویسندگان
چکیده
منابع مشابه
The luminous host galaxies of high redshift BL Lac objects
We present the first near-infrared K s-band (2.1 µm) imaging study of a sizeable sample of 13 high redshift (0.6 < z < 1.3) BL Lac objects in order to characterize the properties of their host galaxies. We are able to clearly detect the surrounding nebulosity in eight objects, and marginally in three others. In all the well resolved objects, we find that the host galaxy is well represented by a...
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We have collected broadband spectral energy distributions (SEDs) of three BL Lac objects, 3FGL J0022.1−1855 (z=0.689), 3FGL J0630.9−2406 (z > ∼1.239), and 3FGL J0811.2−7529 (z=0.774), detected by Fermi with relatively flat GeV spectra. By observing simultaneously in the near-IR to hard X-ray band, we can well characterize the high end of the synchrotron component of the SED. Thus, fitting the S...
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Aims. Spectroscopic monitoring of BL Lac objects is a difficult task that nonetheless can provide important information on the different components of the active galactic nucleus. Methods. We performed optical spectroscopic monitoring of the BL Lac object AO 0235+164 (z = 0.94) with the VLT and TNG telescopes from Aug. 2003 to Dec. 2004, during an extended WEBT campaign. The flux of this source...
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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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New EVN images at 5.0 GHz and 8.4 GHz of ON 231 confirm the complex structure of the source, the identification of the core, the presence of components on the two sides of the core itself and a low brightness extension SouthEast of the main jet. The optical behaviour of the source is discussed in connection to changes in the radio structure.
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1986
ISSN: 0004-6256
DOI: 10.1086/113977