Discovery of VHEγ-rays from the BL Lacertae object PKS 0548–322
نویسندگان
چکیده
منابع مشابه
Modeling 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...
متن کاملVariability of the BL Lacertae Object PKS 2155 − 304
We present a detailed power density spectrum and cross-correlation analysis of the X-ray light curves of the BL Lac object PKS 2155−304 observed with BeppoSAX in 1997 (SAX97) and 1996 (SAX96), aimed at exploring the rapid variability properties and the inter-band cross correlations in the X-rays. We also perform the same analysis on the (archival) X-ray light curve obtained with ASCA in 1994 (A...
متن کاملMultiwavelength Observations of the BL Lacertae Object PKS 2155 – 304 with XMM - Newton
The optical-UV and X-ray instruments on-board XMM-Newton provide an excellent opportunity to perform simultaneous observations of violently variable objects over a broad wavelength range. The UV and X-ray bright BL Lac object PKS 2155–304 has been repeatedly observed with XMM-Newton about twice per year. In this paper, we present a detailed analysis of the simultaneous multi-wavelength variabil...
متن کاملOngoing 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 کاملDiscovery of very high-energy γ-ray emission from the LBL object BL Lacertae
The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from 2005 August to December (22.2 hr), and from 2006 July to September (26.0 hr). A very high energy (VHE) γ-ray signal was discovered with a 5.1 σ excess in the 2005 data. Above 200 GeV, an integral flux of (0.6± 0.2) × 10 cm s was measured, corresponding to approximately 3% of the Crab flux. The di...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2010
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200912363