scholarly journals The Potential of the Wide Field Camera on ROSAT for Investigations of the XUV Background

1990 ◽  
Vol 139 ◽  
pp. 463-464
Author(s):  
Alan W. Harris ◽  
Helen J. Walker ◽  
Timothy J. Sumner
Keyword(s):  
Grazing Incidence ◽  
Space Science ◽  
Primary Objective ◽  
Wide Field ◽  
Science Laboratory ◽  
Joint Project ◽  
X Ray ◽  
Sky Survey ◽  
Space Science Laboratory

The ROSAT X-ray astronomy satellite, due to be launched in early 1990, will carry two separate and complementary grazing-incidence telescopes with co-aligned axes. The German X-ray telescope (XRT) will cover the soft X-ray region in the range 0.15–2 keV (6–80 Å), while the U.K. XUV Wide Field Camera (WFC) will extend coverage to beyond 200 Å. The WFC is a joint project of Leicester and Birmingham Universities, the Mullard Space Science Laboratory, and the authors' institutes. The primary objective of ROSAT is to perform an all-sky survey over a period of six months. This will be followed by a guest-observer, “pointed” phase. We briefly discuss the sensitivity of the WFC to the soft X-ray/XUV background (SXRB) and the problems and techniques associated with distinguishing the astronomical background from other sources of background.

Introduction to the Copernicus satellite

1974 ◽  
Vol 340 (1623) ◽  
pp. 397-402 ◽  
Keyword(s):  
Control Systems ◽  
Space Science ◽  
Science Laboratory ◽  
Ultraviolet Astronomy ◽  
X Ray ◽  
Normal Operating ◽  
Stabilized Platform ◽  
Space Science Laboratory ◽  
And Control

The Copernicus spacecraft is the fourth in the series of Orbiting Astronomical Observatories. The series has been used exclusively for ultraviolet astronomy except for the X-ray experiment provided by the Mullard Space Science Laboratory on board the present spacecraft. The satellite enables ultraviolet and X-ray observations to be made from a highly stabilized platform; the major stabilization and control systems are discussed in addition to a review of the normal operating procedures and restrictions.

scholarly journals The Role of Wide Field X-ray Surveys in Astronomy

2012 ◽  
Vol 10 (H16) ◽  
pp. 669-670
Author(s):  
Richard D. Saxton
Keyword(s):  
High Variability ◽  
Wide Field ◽  
Clusters Of Galaxies ◽  
Tidal Disruption ◽  
X Ray ◽  
Sky Survey ◽  
History Of ◽  
X Ray Background ◽  
Rare Classes

AbstractWe review the history of X-ray sky surveys from the early experiments to the catalogues of 105 sources produced by ROSAT, Chandra and XMM-Newton. At bright fluxes the X-ray sky is shared between stars, accreting binaries and extragalactic sources while deeper surveys are dominated by AGN and clusters of galaxies. The X-ray background, found by the earliest missions, has been largely resolved into discrete sources at soft (0.3-2 keV) energies but at higher energies an important fraction still escapes detection. The possible identification of the missing flux with Compton-thick AGN has been probed in recent years by Swift and Integral.Variability seen in objects observed at different epochs has proved to be an excellent discriminator for rare classes of objects. The comparison of ROSAT All Sky Survey (RASS) and ROSAT pointed observations identified several Novae and high variability AGN as well as initiating the observational study of Tidal Disruption events. More recently the XMM-Newton slew survey, in conjunction with archival RASS data, has detected further examples of flaring objects which have been followed-up in near-real time at other wavelengths.

scholarly journals YSTAR: Yonsei Survey Telescopes for Astronomical Research

2001 ◽  
Vol 183 ◽  
pp. 83-87
Author(s):  
Yong-Ik Byun ◽  
Won-Yong Han ◽  
Yong-Woo Kang ◽  
Moo-Young Chun ◽  
Sung-Yeol Yu ◽  
...  
Keyword(s):  
South Africa ◽  
Variable Stars ◽  
Primary Objective ◽  
Wide Field ◽  
Target Acquisition ◽  
Data Set ◽  
Field Surveys ◽  
Sky Survey ◽  
Two Factors ◽  
Astronomical Research

AbstractThe YSTAR program is a general sky survey looking for variability. The main equipments are three 0.5-m telescopes. These telescopes have fast F/2 optics covering nearly 3.5 square degree field onto a 2K CCD. They also have very fast slew capability, which exceeds 10 degrees per second. These two factors make them most suitable for rapid target acquisition and wide-field surveys of various kinds. Our primary objective is to identify and monitor variable stars down to 18th R-magnitude, and our observing mode allows the same data set to be also useful in identifying asteroids. Our first telescope has just begun regular automated operation, and the second telescope will be installed in South Africa within this year to provide coverage of the southern sky.

scholarly journals Grazing incidence optics for wide-field x-ray survey imaging: a comparison of optimization techniques

2000 ◽  
Author(s):  
Peter W. A. Roming ◽  
David N. Burrows ◽  
Gordon P. Garmire ◽  
Jared R. Shoemaker ◽  
William B. Roush
Keyword(s):  
Grazing Incidence ◽  
Optimization Techniques ◽  
Wide Field ◽  
X Ray ◽  
Grazing Incidence Optics

The Wide Field X-ray Telescope Mission—A Digital Sky Survey in X-rays

2010 ◽  
Author(s):  
S. Murray ◽  
R. Giacconi ◽  
A. Ptak ◽  
P. Rosati ◽  
M. Weisskopf ◽  
...  
Keyword(s):  
Wide Field ◽  
X Rays ◽  
X Ray ◽  
Sky Survey

scholarly journals A Search for the Signature of the Diffuse Soft X-ray Background in the ROSAT Wide-Field Camera All-Sky Survey

1996 ◽  
Vol 152 ◽  
pp. 289-293
Author(s):  
R.G. West ◽  
R. Willingale ◽  
J.P. Pye ◽  
T.J. Sumner
Keyword(s):  
Charged Particles ◽  
Field Of View ◽  
Wide Field ◽  
Galactic Latitude ◽  
The Sun ◽  
X Ray ◽  
Cosmic Background ◽  
Sky Survey ◽  
Cosmic Abundance ◽  
X Ray Background

We present the results of an attempt to locate the signature of the diffuse soft X-ray background in the ROSAT Wide-Field Camera (WFC) all-sky survey. After removal of non-cosmic background sources (eg. energetic charged particles), the field-of-view integrated count rate in the WFC S1a filter (90–185 eV) shows no consistent variation with Galactic latitude or longitude. We place limits on the signal from the soft X-ray background (SXRB) in the WFC, and show that these limits conflict with the observations of the Wisconsin Sky Survey if the SXRB in this energy range is assumed to be produced by a thermal plasma of cosmic abundance and a temperature T ~ 106 K within d ~ 100 pc of the Sun.

Sign in / Sign up

Export Citation Format

Share Document