PKS 2005-489: a very bright BL Lac object in a nearby galaxy
نویسندگان
چکیده
منابع مشابه
Ongoing Star Formation in the Bl Lacertae Object Pks 2005 - 489
We present VLT long slit optical spectroscopy of the luminous BL Lacertae object PKS 2005-489. The high signal-to-noise ratio and the good spatial resolution of the data allow us to detect the signatures of ongoing star formation in an extended rotating ring, at ∼ 4 kpc from the nucleus. We find that the ring is almost perpendicular to the radio axis and its total star formation rate is ≃ 1 M ⊙...
متن کاملISO 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 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 کاملDiscovery of VHE gamma rays from PKS 2005 – 489
The high-frequency peaked BL Lac PKS 2005−489 (z = 0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at the 6.7σ level in the 2004 observations (24.2 h live time), but not in the 2003 data set (27.3 h live time). PKS 2005−489 is the first blazar independently discovered by HESS to be an emitter of ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1986
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/219.1.23p