Unveiling the X-ray/TeV engine in Mkn 421
نویسندگان
چکیده
منابع مشابه
Underlying particle spectrum of Mkn 421 during the huge X-ray flare in April 2013
Context. In April 2013, the nearby TeV blazar, Mkn 421, showed one of the largest flares in X-rays in the past decade. Aims. We study all multiwavelength data available during MJD 56 392 to 56 403, with special emphasis on X-ray data to understand the underlying particle energy distribution. Methods. We studied the correlations between the UV and gamma-ray bands with the X-ray band using the z-...
متن کاملThe quiescent state broadband X - ray spectrum and variability of Mkn 421
The BL Lac object Mkn 421 was observed three times by the X-ray observatory BeppoSAX in consecutive days during 1997 April and May. The source was in a quiescent state, with an average 2–10 keV flux of 9.0×10 erg cm s. Flux variation by a factor of ≃2 on timescales as short as a few 10 s were more pronounced in the hard (i.e. above ≃3 keV) than in the soft X-rays. The broadband (0.1–40 keV) spe...
متن کاملSAX Observations of Mkn 421 : clues on the particle acceleration ?
Mkn 421 was repeatedly observed with BeppoSAX in 1997–1998. We present highlights of the results of the thorough temporal and spectral analysis discussed by Fossati et al. (1999) and Maraschi et al. (1999), focusing on the flare of April 1998, which was simultaneously observed also at TeV energies. The detailed study of the flare in different energy bands reveals a few very important new result...
متن کامل0 Observations of Mkn 421 with the CELESTE Experiment
The CELESTE experiment uses the heliostats of an old solar farm in the French Pyrenees to detect gamma ray air showers by the atmospheric Cerenkov technique. Observations of the TeV blazar Markarian 421 have been made with the fully instrumented CELESTE experiment since December 1999. The detection of gamma ray emission from this source at energies greater than 50 GeV is presented here. A compa...
متن کاملThe Chandra High Resolution Spectra of Mkn 421
Mkn 421 was observed by Chandra twice, on November 5, 1999 as part of the Chandra calibration program, with the ACIS-HETG configuration, and on May 29, 2000 following our Target Of Opportunity request aimed to catch the source in an ultra-high state, with both the ACIS-HETG and the HRC-LETG configurations. In this contribution we present and compare the two Chandra-MEG observations of Mkn 421, ...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066134