A ROSAT medium-sensitivity Galactic plane survey at 180°< l < 280°

Details A ROSAT medium-sensitivity Galactic plane survey at 180°< l < 280° A ROSAT medium-sensitivity Galactic plane survey at 180°< l < 280°

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.326.1161m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 326, Issue 3, pp. 1161-1182.

Astronomy and Astrophysics

Astronomy

8

Catalogues, Surveys, Stars: Late-Type, Galaxy: Stellar Content, X-Rays: General

Scientific paper

We have performed a moderately deep soft X-ray (0.1-2keV) survey of the Galactic plane using pointed observations with the ROSAT Position Sensitive Proportional Counter (PSPC). The survey is more than an order of magnitude more sensitive than previous X-ray surveys near the Galactic plane. The data consist of nine fields each of ~10ks exposure, pointed at positions on or very close to the Galactic plane (|b|<0°.3) in the longitude range 180°<~l<~280°. This region has relatively low X-ray absorbing material out to distances of several hundred pc and presents fewer source-confusion problems than at other longitudes. The total sky area surveyed was 2.5deg2 this yielded 93 sources, 89 of which were detected in the `hard' (0.4-2.0keV) band. Nine sources were detected in both `soft' (0.1-0.4keV) and hard bands. In the hard band, the survey coverage is >~90 per cent for sources brighter than 0.002counts-1 (~2×10-14ergcm-2s-1), but falls steeply below this value, with the weakest sources being ~0.001counts-1. The median limiting flux is ~0.0013counts-1 (~1.3×10-14ergcm-2s-1). There are 64 sources with hard-band count rates >0.002counts-1. We present the catalogue of X-ray sources and the number-flux relations (logN-logS). Eighteen sources have possible identifications from the SIMBAD data base. We have searched the Tycho-2 and USNO-A2.0 catalogues to find all possible optical counterparts brighter than ~19th magnitude, and attempt to classify these on the basis of log(fX/fopt) versus optical colour diagrams and near-infrared photometry from the 2MASS Second Incremental Data Release. Hence, we have found the majority of these sources to be consistent with being late-type main-sequence stars, as previous studies have proposed from incompletely identified surveys. Comparison of the measured number-flux relations with predictions of Galactic (stellar) and extragalactic populations supports the view that the population of young stars in the plane is denser than previously thought.

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