ROSAT observations of four unidentified EMSS sources

Details ROSAT observations of four unidentified EMSS sources ROSAT observations of four unidentified EMSS sources

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..970c&link_type=abstract

The Astronomical Journal, vol. 108, no. 3, p. 970-977

Astronomy and Astrophysics

Astronomy

2

Galaxies, Rosat Mission, Spectrum Analysis, X Ray Astronomy, X Ray Sources, Astronomical Spectroscopy, Color, Graphs (Charts), Identifying, Proportional Counters, Ratios, Stellar Magnitude, Tables (Data), X Ray Spectra, X Ray Telescopes

Scientific paper

We present an analysis of four unidentified Einstein Observatory Extended Medium Sensitivity Survey sources detected in two pointed ROSAT/Position Sensitive Proportional Counter (PSPC) observations. One source (MS0420.0-3838) is resolved in two sources denoted with N (North) and S (South) in the ROSAT image. Only for one source (MS0420.6-3839) we have enough counts to allow a spectral analysis. For the other sources we have limited ourselves to the calculation of the x-ray hardness ratio and then, assuming a galactic value for the hydrogen column density, we have derived an energy index alpha epsilon. We find a wide range of alphaepsilon (1 equal to or less than alphaepsilon equal to or less than 3). Thanks to a significantly improved x-ray positional accuracy, generally only one or two objects down to approx. 22 mag are present in the error circle. We have spectroscopically identified three sources with AGN: two are radio-quiet Quasi-Stellar Object (QSO) at z = 0.831 and z = 0.482, the third one is a Narrow Emission Line Galaxy at z = 0.572. For the remaining sources no optical spectroscopy is available; however, the values of alphaox and alpharo show that also these sources are probably AGN.

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