The X-ray spectrum and variability of Markarian 421
نویسندگان
چکیده
منابع مشابه
X-ray flaring activity of Markarian 421
We report results from a systematic search for X-ray flares from Mrk 421, using archival data from the Rossi X-Ray Timing Explorer (RXTE) satellite. The flares are clearly seen over a wide range of timescales. The quasicontinuous coverage of the source with the All-SkyMonitor (ASM) reveals frequent occurrence of major flares that last for months. On a few occasions, the source was intensively m...
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Markarian 421 was the first extragalactic source to be detected with high statistical certainty at TeV energies. The Whipple Observatory gamma-ray telescope has been used to observe the Active Galactic Nucleus, Markarian 421 in 1996 and 1997. The rapid variability observed in TeV gamma rays in previous years is confirmed. Doubling times as short as 15 minutes are reported with flux levels reach...
متن کاملCross-spectral analysis of the X-ray variability of Markarian 421
Using the cross-spectral method, we confirm the existence of the X-ray hard lags discovered with cross-correlation function technique during a large flare of Mrk 421 observed with BeppoSAX. For the 0.1–2 versus 2–10 keV light curves, both methods suggest sub-hour hard lags. In the time domain, the degree of hard lag, i.e. the amplitude of the 3.2–10 keV photons lagging the lower energy ones, te...
متن کاملObservation of Strong Variability in the X-Ray Emission from Markarian 421 Correlated with the May 1996 TeV Flare
We observed the BL Lac object Markarian 421 with the X-ray satellite RXTE and the Whipple Air Cerenkov Telescope during a two week correlated Xray/gamma-ray campaign in May 1996. Two dramatic outbursts with extremely rapid and strong flux variations were observed at TeV energies during this period. The X-ray emission in the 2-10 keV band was highly variable and reached a peak flux of 5.6×10 erg...
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...
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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/219.1.39