Computer identification of celestial objects and its problems: the case of optical identification of X-ray sources

1990 ◽  
Vol 13 (2) ◽  
pp. 489-496
Author(s):  
G. Pizzichini ◽  
S. Rebecchi
Keyword(s):  
Optical Identification ◽  
X Ray ◽  
Computer Identification

scholarly journals X-Ray Nova Flares

1975 ◽  
Vol 67 ◽  
pp. 501-508
Author(s):  
P. R. Amnuel ◽  
O. H. Guseinov
Keyword(s):  
Light Curve ◽  
Physical Nature ◽  
Dwarf Star ◽  
Optical Identification ◽  
X Ray ◽  
Spectral Class ◽  
Maximum Value ◽  
The Galaxy

In order to find out the physical nature of galactic X-ray sources, data on the variability of 24 sources during 1964–1971 have been investigated. The fluxes of 9 sources are found to be increasing to the maximum value (for several months) and then slowly decreasing (for 3 years). These 9 sources have been related by us to the class of X-ray Novae. The X-ray Nova synthetic light curve has been drawn from data of the fluxes of 9 discovered Novae. Assumptions have been made on the physical nature of the X-ray Novae. Between the flares the X-ray Novae may be weak X-ray sources with a luminosity of about 1034 erg s−1. During the flares the luminosity increases to about 1038 erg s−1. The number of X-ray sources in the Galaxy is about 103–104. The object of the optical identification may be a dwarf star of no earlier spectral class than F.

scholarly journals PROBING THE MSP PRENATAL STAGE: THE OPTICAL IDENTIFICATION OF THE X-RAY BURSTER EXO 1745-248 IN TERZAN 5

2015 ◽  
Vol 807 (1) ◽  
pp. L1 ◽  
Author(s):  
F. R. Ferraro ◽  
C. Pallanca ◽  
B. Lanzoni ◽  
M. Cadelano ◽  
D. Massari ◽  
...  
Keyword(s):  
Optical Identification ◽  
X Ray

Extragalactic X-ray sources and the diffuse X-ray background

1979 ◽  
Vol 366 (1726) ◽  
pp. 391-402 ◽  
Keyword(s):  
Spatial Distribution ◽  
Euclidean Space ◽  
Active Galaxies ◽  
Clusters Of Galaxies ◽  
Optical Identification ◽  
X Ray ◽  
Luminosity Functions ◽  
Sky Survey ◽  
Order Of Magnitude ◽  
X Ray Background

Results from the Ariel 5 sky survey instrument relating to the properties and the spatial distribution of extragalactic X-ray sources are discussed. The lg N -lg S relation for sources in the 2A catalogue is consistent with a uniform distribution of sources in Euclidean space. In addition, measure­ments of fluctuations in the X-ray background suggest that the Euclidean form of the source counts can be extrapolated to flux levels at least an order of magnitude fainter than the 2A catalogue limit. Information is also available from the optical identification of 2A sources which, through redshift measurements, enables the X-ray luminosity functions of the two main classes of source, namely clusters of galaxies and active galaxies, to be determined. The luminosity functions can be used to calculate the contribution of clusters of galaxies and active galaxies to the diffuse X-ray background in the 2-10 keV range. It is found that cosmological evolution of one or both populations is required to account for the diffuse X-ray background entirely in terms of the integrated emission from these sources.

Optical identification and interpretation of x-ray sources

1968 ◽  
Vol 8 (4) ◽  
Author(s):  
Minoru Oda
Keyword(s):  
Optical Identification ◽  
X Ray

scholarly journals First Results from the VLA FIRST Survey

1996 ◽  
Vol 175 ◽  
pp. 499-502
Author(s):  
R.H. Becker ◽  
M.D. Gregg ◽  
D.J. Helfand ◽  
C.M. Cress ◽  
R. Mcmahon ◽  
...  
Keyword(s):  
Correlation Function ◽  
Radio Sources ◽  
Optical Identification ◽  
X Ray ◽  
The North ◽  
First Results ◽  
Angular Correlation Function ◽  
Second Year ◽  
North Galactic ◽  
Followup Studies

The VLA FIRST survey is now in its second year. We have completed mapping over 1500 deg2 of the North Galactic Cap and present here the catalog of the 138,000 radio sources detected therein. We discuss the statistics of this new catalog including the two-point angular correlation function for all radio emitters, present our optical identification of 24,000 sources using the APM catalog, and report followup studies on radio variability, X-ray source identification, and our bright quasar sample.

Optical Identification of the ROSAT All-Sky Survey Sources in Two 2° × 2° Fields

1997 ◽  
Vol 159 ◽  
pp. 427-428
Author(s):  
Y. Zhao ◽  
J. Zhong ◽  
J. Wei ◽  
J. Hu ◽  
Q. Li
Keyword(s):  
Ccd Camera ◽  
Seyfert Galaxies ◽  
Astronomical Observatory ◽  
Active Galaxies ◽  
Clusters Of Galaxies ◽  
Late Type ◽  
Optical Identification ◽  
X Ray ◽  
Sky Survey

AbstractWe used the CCD camera and spectrograph of the 2.16-m telescope of Beijing Astronomical Observatory to identify the ROSAT All-Sky survey sources in two 2° Ü 2° fields. Of a total of 16 X-ray sources, we identified 13 of them as follows: two QSOs, two Seyfert galaxies, two active galaxies, two clusters of galaxies, and five late-type stars. Three X-ray sources remained unidentified.

scholarly journals Optical identification of the transient supersoft X-ray source RX J0527.8-6954, in the LMC

2010 ◽  
Vol 517 ◽  
pp. L5 ◽  
Author(s):  
A. S. Oliveira ◽  
J. E. Steiner ◽  
T. V. Ricci ◽  
R. B. Menezes ◽  
B. W. Borges
Keyword(s):  
Optical Identification ◽  
X Ray

Radio and optical identification of the X-ray source GX 17+2

1978 ◽  
Vol 221 ◽  
pp. 225 ◽  
Author(s):  
R. M. Hjellming
Keyword(s):  
Optical Identification ◽  
X Ray

The Geminga X-ray counterpart and a blue optical identification

1988 ◽  
Vol 330 ◽  
pp. 201 ◽  
Author(s):  
J. P. Halpern ◽  
D. Tytler
Keyword(s):  
Optical Identification ◽  
X Ray

scholarly journals Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey

2018 ◽  
Vol 44 (8-9) ◽  
pp. 522-540 ◽  
Author(s):  
D. I. Karasev ◽  
A. A. Lutovinov ◽  
A. Yu. Tkachenko ◽  
G. A. Khorunzhev ◽  
R. A. Krivonos ◽  
...  
Keyword(s):  
Optical Identification ◽  
X Ray ◽  
Sky Survey
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