Rapid X-Ray Variability
نویسنده
چکیده
2 Rapid X-Ray Variability page 1 2.
منابع مشابه
X-ray Variability of Agn and Correlations with Spectral Properties
Rapid flux changes in the X-ray emission from active galactic nuclei are commonly observed. The powerdensity spectra show a pseudo power-law form with a turnover at low frequencies and a high frequency break, similar to galactic black-hole candidates. There have been a few claims for periodicities but these are not a well-established property of the class. The amplitude of variability depends o...
متن کاملRapid X - ray Variability of Seyfert 1 Galaxies
The rapid and seemingly random fluctuations in X-ray luminosity of Seyfert galaxies provided early support for the standard model in which Seyferts are powered by a supermassive black hole fed from an accretion disc. However, since EXOSAT there has been little opportunity to advance our understanding of the most rapid X-ray variability. Observations with XMM-Newton have changed this. We discuss...
متن کاملThe Rapid X-ray Variability of Gm Sagittarii (sax J1819.3–2525 = Xte J1819–254)
We report on the rapid X-ray variability of the variable star and X-ray transient GM Sgr (SAX J1819.3–2525; XTE J1819–254) as observed on 15 Sept. 1999 by the proportional counter array (PCA) on board the Rossi X-ray Timing Explorer (RXTE). During the first ∼900 seconds of the first RXTE/PCA observation, GM Sgr showed very strong Xray fluctuations by a factor of 4 on time scales of seconds to a...
متن کاملROSAT monitoring of persistent giant and rapid variability in the narrow - line Seyfert 1 galaxy IRAS 13224 – 3809
We report evidence for persistent giant and rapid X-ray variability in the radio-quiet, ultrasoft, strong Fe ii, narrow-line Seyfert 1 galaxy IRAS 13224–3809. Within a 30 day ROSAT High Resolution Imager (HRI) monitoring observation at least five giant amplitude count rate variations are visible, with the maximum observed amplitude of variability being about a factor of 60. We detect a rise by ...
متن کاملChandra reveals a black - hole X - ray binary within the ultraluminous supernova remnant MF 16
We present evidence, based on Chandra ACIS-S observations of the nearby spiral galaxy NGC 6946, that the extraodinary X-ray luminosity of the MF 16 supernova remnant actually arises in a black-hole X-ray binary. This conclusion is drawn from the point-like nature of the X-ray source, its X-ray spectrum closely resembling the spectrum of other ultraluminous X-ray sources thought to be black-hole...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004