Erratum: X-Ray and ultraviolet observations 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...
متن کاملSimultaneous X-Ray and TeV Observations of a Rapid Flare from Markarian 421.
Mrk 421 was observed for about 2 days with BeppoSAX in 1998 April as part of a worldwide multiwavelength campaign. A large, well-defined flare was observed in X-rays. The same flare was observed simultaneously at TeV energies by the Whipple Observatory gamma-ray telescope. These data provide (1) the first evidence that the X-ray and TeV intensities are well correlated on timescales of hours and...
متن کاملXMM − Newton observations of Markarian 421 ?
The BL Lac object Mrk 421 was observed on May 25, 2000 during the XMM−Newton Cal/PV phase. The high throughput of the X-ray telescopes and the spectral capabilities of the instruments allow an uninterrupted temporal and spectral study of the source with unprecedented time resolution. Mrk 421 was found at a relatively high state with a 2−6 keV flux of (1.3−1.9)×10−10 erg cm−2 s−1. The observed i...
متن کاملTeV OBSERVATIONS OF THE VARIABILITY AND SPECTRUM OF MARKARIAN 421
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 کاملMultiwavelength Observations of Markarian 421 in March 2001: an Unprecedented View on the X-ray/tev Correlated Variability
We present a detailed analysis of week-long simultaneous observations of the blazar Mrk 421 at 2–60 keV X-rays (RossiXTE) and TeV γ-rays (Whipple and HEGRA) in 2001. Accompanying optical monitoring was performed with the Mt. Hopkins 48" telescope. The unprecedented quality of this dataset enables us to establish the existence of the correlation between the TeV and X-ray luminosities, and also t...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1988
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/234.3.799