The spectrum of the extragalactic X-ray background below 3 keV

Autor:	R. S. Warwick, C. R. Barber
Rok vydání:	1994
Předmět:	Physics Interstellar medium X-ray astronomy Space and Planetary Science ROSAT X-ray background Astronomy Soft X-radiation Astronomy and Astrophysics Astrophysics Galaxy Background radiation
Zdroj:	Monthly Notices of the Royal Astronomical Society. 267:270-282
ISSN:	1365-2966 0035-8711
DOI:	10.1093/mnras/267.2.270
Popis:	We present the results of a ROSAT XRT/PSPC observation of a field near the North Galactic Pole containing the interacting galaxy pair NGC 4725/4747. A tidal H I plume emanating from NGC 4747 and also the extended HI disc in NGC 4725 represent foreground screens which will, in principle, cast shadows on any extra-galactic component of the soft X-ray background. The failure to detect such shadowing in the ROSAT observation leads to a 95 per cent upper limit on the intensity of the unresolved extragalactic background of 26.5 keV cm −2 s −1 sr −1 keV −1 at 0.25 keV, after excluding discrete sources brighter than 1.7×10 −14 erg cm −2 s −1 in the 0.5-2 keV band
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f324297dd00cc2bb7ecf159e86f49d0a https://doi.org/10.1093/mnras/267.2.270 Zobrazit plný text záznamu