منابع مشابه
Hard X-ray Emission from Cassiopeia a Snr
Abstract. We report the results of extracting the hard X-ray continuum spectrum of Cas A SNR from RXTE/PCA Target of Opportunity observations (TOO) and CGRO/OSSE observations. The data can rule out the single thermal bremsstrahlung model for Cas A continuum between 2 and 150 keV. The single power law model gives a mediocre fit (∼5%) to the data with a power-law index, Γ = 2.94±0.02. A model wit...
متن کاملFine-structure in the nonthermal X-ray emission of SNR RX J1713.7−3946 revealed by Chandra
We present morphological and spectroscopic studies of the northwest rim of the supernova remnant RX J1713.7−3946 based on observations by the Chandra X-ray observatory. We found a complex network of nonthermal (synchrotron) X-ray filaments, as well as a ’void’ type structure – a dim region of a circular shape – in the northwest rim. It is remarkable that despite distinct brightness variations, ...
متن کاملX–ray Emission in Gamma-ray Blazars
As shown by Maraschi (this volume) the overall spectral energy distribution (SED) of the blazars detected by EGRET shows two peaks, in a ν–νF (ν) plot. With few exceptions, the minimum between these two peaks occurs in the X–ray range. We can exploit this observational fact to constrain the models proposed to account for the SED of blazars, and to reach an important conclusion: the conversion o...
متن کاملDetection of X – Ray Emission from the PSR 1259 – 63 / SS 2883 Binary System ∗
Nonpulsed but variable X-ray emission has been detected from the binary system containing the radio pulsar PSR 1259–63 during two pointed ROSAT observations, taken five months apart. This 47.7 ms radio pulsar is in a highly eccentric (2 ∼ .85) binary system with the 10 to 15 M ̄ Be star SS2883. It is the first radio pulsar found to be in a binary system with a massive main sequence companion; it...
متن کاملX-ray emission from the PSR B1259–63 system near apastron
The PSR B1259–63 system contains a 47 ms radio pulsar in a highly eccentric binary with a Be-star companion. Strongly time variable X-ray emission was reported from this system as the pulsar was near apastron in 1992-early 1993. The variability was primarily deduced from an apparent non-detection of the PSR B1259-63 system during a first pre-apastron ROSAT observation in February 1992. We have ...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 1998
ISSN: 1539-2996
DOI: 10.1017/s1539299600021432