Absorption Structure in the BL LAC Object 0215+015 at 20 KM S−1 Resolution

نویسندگان
چکیده

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Extraordinary Activity in the BL Lac Object OJ 287

We use a continuous wavelet transform to analyze more than two decades of data for the BL Lac object OJ 287 acquired as part of the UMRAO variability program. We find clear evidence for a persistent modulation of the total flux and polarization with period ∼ 1.66 years, and for another signal that dominates activity in the 1980s with period ∼ 1.12 years. The relationship between these two varia...

متن کامل

Unusual radio variability in the BL Lac object 0235 + 164

We present radio observations at three frequencies and contemporaneous optical monitoring of the peculiar BLLac object AO0235+164. During a three-week campaign with the VLA we observed intraday variability in this source and found a distinct peak which can be identified throughout the radio frequencies and tentatively connected to the R-band variations. This event is characterized by unusual pr...

متن کامل

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 کامل

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...

متن کامل

EVN Observations of the BL Lac object ON 231 ⋆

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.

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

ژورنال

عنوان ژورنال: Symposium - International Astronomical Union

سال: 1983

ISSN: 0074-1809

DOI: 10.1017/s0074180900039322