AO 0235 + 16.4 -- Another Source Exceeding The Speed Limit
نویسندگان
چکیده
منابع مشابه
Spectroscopic monitoring of the BL Lac object AO 0235 + 164 ⋆
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...
متن کاملDual - Frequency VSOP Observations of AO 0235 + 164
AO 0235+164 is a very compact, flat spectrum radio source identified as a BL Lac object at a redshift of z = 0.94. It is one of the most violently variable extragalactic objects at both optical and radio wavelengths. The radio structure of the source revealed by various ground-based VLBI observations is dominated by a nearly unresolved compact component at almost all available frequencies. Dual...
متن کاملExtreme intranight variability in the BL Lacertae object AO 0235 + 164
We present results of two-colour photometry with high time resolution of the violently variable BL Lac object AO 0235+164. We have found extreme intranight variability with amplitudes of ∼ 100% over time scales of 24 hours. Changes of 0.5 magnitudes in both R and V bands were measured within a single night, and variations up to 1.2 magnitudes occurred from night to night. A complete outburst wi...
متن کاملVSOP Monitoring of the Compact BL Lac Object AO 0235 + 164 Sándor
In 1999, the highly compact and variable BL Lac object AO 0235+164 was identified as the highest brightness temperature active galactic nucleus observed with the VLBI Space Observatory Programme (VSOP), with TB > 5.8× 1013K (Frey et al. 2000). The sub-milliarcsec radio structure of this source has been studied with dualfrequency (1.6 and 5GHz), polarization-sensitive VSOP observations during 20...
متن کاملAO 0235+164: rapid flux variations caused by relativistic aberration effects
An unusual event of rapid flux density variations (with a timescale of ∼4 days) observed at 1.49, 4.86 and 8.44 GHz in the highly variable BL Lac object AO 0235+164 is analysed. The distinct properties of the burst are: (1) the flux density reached its maximum at 1.49 GHz earlier than at 4.86 and 8.44 GHz; (2) the duration of the burst decreased with decreasing frequency; (3) the variability am...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1976
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/177.1.1p