Please use this identifier to cite or link to this item:
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3981Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.creator | Page, M. J. | - |
| dc.creator | Mittaz, J. P. D. | - |
| dc.creator | Carrera, Francisco J. | - |
| dc.date | 2008-05-04T19:26:04Z | - |
| dc.date | 2008-05-04T19:26:04Z | - |
| dc.date | 2000-06-24 | - |
| dc.date.accessioned | 2017-01-31T01:09:27Z | - |
| dc.date.available | 2017-01-31T01:09:27Z | - |
| dc.identifier | arXiv:astro-ph/0006347v1 | - |
| dc.identifier | Mon. Not. Roy. Astron. Soc. 318 (2000) 1073 | - |
| dc.identifier | 0035-8711 | - |
| dc.identifier | http://hdl.handle.net/10261/3981 | - |
| dc.identifier.uri | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3981 | - |
| dc.description | 13 pages, 6 figures.-- Accepted for publication in MNRAS. | - |
| dc.description | We present a catalogue of 147 serendipitous X-ray sources selected to have hard spectra (alpha < 0.5) from a survey of 188 ROSAT fields. Such sources must be the dominant contributors to the X-ray background at faint fluxes. We have used Monte Carlo simulations to verify that our technique is very efficient at selecting hard sources: the survey has > 10 times as much effective area to hard sources as it has to soft sources above a 0.5 - 2 keV flux level of 10^-14 erg/cm^2/s. The distribution of best fit spectral slopes of the hard sources suggests that a typical ROSAT hard source in our survey has a spectral slope alpha ~0. The hard sources have a steep number flux relation (dN/dS propto S^-gamma with a best fit value of gamma = 2.72 +- 0.12) and make up about 15% of all 0.5 - 2 keV sources with S > 10^-14 erg/cm^2/s. If their N(S) continues to fainter fluxes, the hard sources will comprise ~ 40% of sources with 5 10^-15 < S < 10^-14. The population of hard sources can therefore account for the harder average spectra of ROSAT sources with S < 10^-14. They probably make a strong contribution to the X-ray background at faint fluxes and could be the solution to the X-ray background spectral paradox. | - |
| dc.description | FJC thanks the DGES for partial financial support, under project PB95-0122. | - |
| dc.description | Peer reviewed | - |
| dc.format | 351149 bytes | - |
| dc.format | application/pdf | - |
| dc.language | eng | - |
| dc.publisher | Blackwell Publishing | - |
| dc.relation | Preprint | - |
| dc.rights | openAccess | - |
| dc.subject | X-ray sources | - |
| dc.subject | Hard spectra | - |
| dc.subject | ROSAT fields | - |
| dc.subject | Catalogue | - |
| dc.subject | Astrophysics | - |
| dc.title | A survey of hard spectrum ROSAT sources 1: X-ray source catalogue | - |
| dc.type | Pre-print | - |
| Appears in Collections: | Digital Csic | |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.