The Rosat All-Sky Survey Bright Source Catalog

Abstract

We present the ROSAT All-Sky Survey Bright Source Catalogue (RASS-BSC, revision 1RXS) derived from the all-sky survey performed during the first half year (1990/91) of the ROSAT mission. 18,811 sources are catalogued (i) down to a limiting ROSAT PSPC countrate of 0.05 cts/s in the 0.1−2.4 keV energy band, (ii) with a detection likelihood of at least 15 and (iii) at least 15 source counts. The 18,811 sources underwent both an automatic validation and an interactive visual verification process in which for 94% of the sources the results of the standard processing were confirmed. The remaining 6% have been analyzed using interactive methods and these sources have been flagged. Flags are given for (i) nearby sources; (ii) sources with positional errors; (iii) extended sources; (iv) sources showing complex emission structures; and (v) sources which are missed by the standard analysis software. Broad band (0.1−2.4 keV) images are available for sources flagged by (ii), (iii) and (iv). For each source the ROSAT name, position in equatorial coordinates, positional error, source count-rate and error, background count-rate, exposure time, two hardness-ratios and errors, extent and likelihood of extent, likelihood of detection, and the source extraction radius are provided. At a brightness limit of 0.1 cts/s (8,547 sources) the catalogue represents a sky coverage of 92%. The RASS-BSC, the table of possible identification candidates, and the broad band images are available in electronic form (Voges et al. 1996a) via http://wave.xray.mpe.mpg.de/rosat/catalogues/rassbsc . 1

High-redshift blazar identification for Swift J1656.3-3302

“…Tueller et al (2006) detected no sources with Swift/UVOT (Roming et al 2005) in the XRT error circle at a limiting magnitude of 20 in the ultraviolet filters. The soft X-ray position of Swift J1656.3−3302 is consistent with the radio source NVSS J165616−330211 (having a 1.4 GHz flux density of 410.7 ± 12.3 mJy; Condon et al 1998) and (albeit marginally) with the faint ROSAT source 1RXS J165616.6−330150 (Voges et al 2000). According to Tueller et al (2006) the ROSAT data indicate that, if the two sources are the same, spectral variability may be present.…”

“…5). Along with the optical and X-/gamma-ray information obtained in the present work, we have used the 1.4 GHz NVSS radio flux from Condon et al (1998), the IRAS infrared upper limits (IRAS 1988) in the mid-infrared bands (12, 25, 60 and 100 µm), the ROSAT 0.1-2.4 keV flux (Voges et al 2000) and the upper limit at MeV energies from the EGRET survey (Hartman et al 1999). When plotting the SED, we respectively corrected the optical and the X-ray spectra from the contribution of the foreground Galactic extinction using the E(B − V) and N H values reported in Sects.…”

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

“…The data points are compatible and the difference in flux arises The green contours show 3σ, 4σ, 5σ, 6σ contour levels for an integration radius of 0.12 • . The white circles represent the position of three faint RASS (Voges et al 2000) sources: X1 indicates 1RXS J150841.2-621006, X2 indicates 1RXS J150639.1-615704 and X3 indicates 1RXS J150354.7-620408. The 68% containment radius for the point spread function (PSF) of the H.E.S.S.…”

Nearby Young Solar Analogs. I. Catalog and Stellar Characteristics

“…The PSPC was sensitive to Xrays over an energy range of about 0.2-2 keV and had an angular resolution of approximately 30Љ (Trümper 1983;Pfeffermann et al 1986). Flux data were retrieved from the Bright Source Catalog (BSC), which contains the 18,811 brightest sources in the ROSAT All Sky Survey (Trümper 1993;Voges et al 1996), and SRCCAT, consisting of sources detected in the entire collection of pointed observations (Voges et al 1994). The Hipparcos catalog is complete to V ϭ 7.9 ϩ 1.1 sin FbF for stars bluer than and to B Ϫ V ϭ 0.8 V ϭ 7.3 ϩ for redder stars, where b is the Galactic latitude.…”