Wolfgang Voges

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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 count-rate of 0.05 cts s−1 in the 0.1−2.4 keV energy band, (ii) with a detection likelihood of at least 15(More)
The Swift mission, scheduled for launch in 2004, is a multiwavelength observatory for gamma-ray burst (GRB) astronomy. It is a first-of-its-kind autonomous rapid-slewing satellite for transient astronomy and pioneers the way for future rapid-reaction and multiwavelength missions. It will be far more powerful than any previous GRB mission, observing more(More)
This paper describes the Fifth Data Release (DR5) of the Sloan Digital Sky Survey (SDSS). DR5 includes all survey quality data taken through June 2005 and represents the completion of the SDSS-I project (whose successor, SDSSII will continue through mid-2008). It includes five-band photometric data for 217 million objects selected over 8000 deg, and(More)
We present a measure of the power spectrum on scales from 15 to 800 hMpc using the ROSAT-ESO Flux-Limited X-Ray (REFLEX) galaxy cluster catalogue. The REFLEX survey provides a sample of the 452 X-ray brightest southern clusters of galaxies with the nominal flux limit S = 3.0 × 10 erg s cm for the ROSAT energy band (0.1 − 2.4) keV. Several tests are(More)
We present the first systematic study of (non-radio-selected) radio-loud narrow-line Seyfert 1 (NLS1) galaxies. Cross-correlation of the ‘Catalogue of Quasars and Active Nuclei’ with several radio and optical catalogues led to the identification of ∼11 radio-loud NLS1 candidates including 4 previously known ones. This study almost triples the number of(More)
This paper describes the fourth data release of the Sloan Digital Sky Survey (SDSS), including all survey-quality data taken through June 2004. The data release includes five-band photometric data for 180 million objects selected over 6670 deg, and 673,280 spectra of galaxies, quasars, and stars selected from 4783 deg of that imaging data using the standard(More)
1 Results reported here are based on observations made with the Multiple Mirror Telescope, a joint facility of the Smithonian Institution and the University of Arizona ABSTRACT In the construction of an X-ray selected sample of galaxy clusters for cosmological studies, we have assembled a sample of 495 X-ray sources found to show extended X-ray emission in(More)
The field of e-science currently faces many challenges. Among the most important ones are the analysis of huge volumes of scientific data and the connection of various sciences and communities, thus enabling scientists to share scientific interests, data, and research results. These issues can be addressed by processing large data volumes on-thefly in the(More)
The Sloan Digital Sky Survey has validated and made publicly available its Second Data Release. This data release consists of 3324 square degrees of five-band (u g r i z) imaging data with photometry for over 88 million unique objects, 367,360 spectra of galaxies, quasars, stars and calibrating blank sky patches selected over 2627 degrees of 31 Enrico Fermi(More)
We discuss the optical and radio properties of 30,000 FIRST (radio, 20 cm, sensitive to 1 mJy) sources positionally associated within 1>5 with a Sloan Digital Sky Survey (SDSS) (optical, sensitive to r* 22.2) source in 1230 deg2 of sky. The matched sample represents 30% of the 108,000 FIRST sources and 0.1% of the 2.5 107 SDSS sources in the studied region.(More)