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Titolo:
A ROSAT medium-sensitivity Galactic plane survey at 180 degrees < l < 280 degrees

Autore:

Morley, JE; Briggs, KR; Pye, JP; Favata, F; Micela, G; Sciortino, S;

Indirizzi:: Univ Leicester, Dept Phys & Astron, Xray Astron Grp, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH er LE1 7RH, Leics, England ESA, ESTEC, Dept Space Sci, Div Astrophys, NL-2200 AG Noordwijk, Netherlands ESA Noordwijk Netherlands NL-2200 AG , NL-2200 AG Noordwijk, Netherlands Osserv Astron Palermo, I-90134 Palermo, Italy Osserv Astron Palermo Palermo Italy I-90134 ermo, I-90134 Palermo, Italy
Titolo Testata:: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 3, volume: 326, anno: 2001,
pagine: 1161 - 1182
SICI:: 0035-8711(20010921)326:3<1161:ARMGPS>2.0.ZU;2-A
Fonte:: ISI
Lingua:: ENG
Soggetto:: X-RAY SOURCES; STELLAR CORONAL COMPONENT; N-LOG-S; SOLAR NEIGHBORHOOD; NUMERICAL-MODEL; STAR-FORMATION; PSPC CATALOG; SKY SURVEY; GALAXY; REGION;
Keywords:: catalogues; surveys; stars : late-type; Galaxy : stellar content; X-rays : general;
Tipo documento:: Article
Natura:: Periodico
Settore Disciplinare:: Physical, Chemical & Earth Sciences
Citazioni:: 53
Recensione:
Indirizzi per estratti:: Indirizzo: Morley, JE Univ Leicester, Dept Phys & Astron, Xray Astron Grp, Leicester LE1 7RH, Leics, England Univ Leicester Leicester Leics England LE1 7RH Leics, England



Citazione:: J.E. Morley et al., "A ROSAT medium-sensitivity Galactic plane survey at 180 degrees < l < 280 degrees", M NOT R AST, 326(3), 2001, pp. 1161-1182

Abstract

We have performed a moderately deep soft X-ray (0.1-2 keV) 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 approximate to 10 ks; exposure, pointed atpositions on or very close to the Galactic plane (\b\ < 0.<degrees>3) in the longitude range 180 degrees less than or similar to l less than or similar to 280 degrees. 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 2.5 deg(2); this yielded 93 sources, 89 of which were detected in the 'hard' (0.4-2.0 keV) band. Nine sources were detected in both 'soft' (0.1-0.4 keV) and hard bands. In the hard band, the survey coverage is greater than or similarto 90 per cent for sources brighter than 0.002 count s(-1) (similar to 2 x10(-14) erg cm(-2) s(-1)), but falls steeply below this value, with the weakest sources being similar to0.001 count s(-1). The median limiting flux is approximate to0.0013 count s(-1) (similar to1.3 x 10(-14) erg cm(-2) s(-1)). There are 64 sources with hard-band count rates > 0.002 count s(-1). Wepresent the catalogue of X-ray sources and the number-flux relations (log N-log S). 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 similar to 19th magnitude, and attempt to classify these on the basis of log (f(x)/f(opt)) 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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Documento generato il 24/05/13 alle ore 06:26:16