Continuous rapid X-ray variability and spectral changes in NGC 4051
نویسندگان
چکیده
منابع مشابه
The rapid X - ray variability of NGC 4051 2491
We present an analysis of the high-frequency X-ray variability of NGC 4051 (MBH ∼ 1.7 × 106 M ) based on a series of XMM–Newton observations taken in 2009 with a total exposure of ∼570 ks (EPIC pn). These data reveal the form of the power spectrum over frequencies from 10−4 Hz, below the previously detected power spectral break, to 10−2 Hz, above the frequency of the innermost stable circular o...
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NGC 3783 was observed for approximately 210 ks by Suzaku and in this time showed significant spectral and flux variability at both short (20 ks) and long (100 ks) timescales. The full observation is found to consist of approximately six “spectral periods” where the behavior of the soft (0.3–1.0 keV) and hard (2–10 keV) bands are somewhat distinct. Using a variety of methods we find that the str...
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Archival XMM-Newton data on the nearby Seyfert galaxy NGC 4051, taken in relatively high and low flux states, offer a unique opportunity to explore the complexity of its X-ray spectrum. We find the hard X-ray band to be significantly affected by reflection from cold matter, which can also explain a non-varying, narrow Fe K fluorescent line. We interpret major differences between the high and lo...
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We analyse 15 XMM–Newton observations of the Seyfert galaxy NGC 4051 obtained over 45 d to determine the ultraviolet (UV) light curve variability characteristics and search for correlated UV/X-ray emission. The UV light curve shows variability on all time-scales, however with lower fractional rms than the 0.2–10 keV X-rays. On days–weeks time-scales the fractional variability of the UV is Fvar ...
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We present a comprehensive examination of the X-ray variability of the narrow line Seyfert 1 (NLS1) galaxy NGC 4051, one of the most variable AGN in the sky. We combine over 6.5 years of frequent monitoring observations by RXTE with a > 100 ks continuous observation by XMM-Newton and so present an overall 2-10 keV powerspectral density (PSD) covering an unprecedent frequency range of over 6.5 d...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1985
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/217.4.685