EUV/Faint ivo://nasa.heasarc/euvexrtcat NASA/GSFC HEASARC Lampton et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The All-Sky Catalog of Faint Extreme-Ultraviolet (EUV) Sources is a list of 534 objects detected jointly in the Extreme Ultraviolet Explorer (EUVE) (100 Angstrom (AA) band) All-Sky Survey and in the ROSAT X-ray Telescope (XRT) (0.25 keV band) All-Sky Survey. The joint selection criterion within a 1.5 arcminute positional tolerance permitted the use of a low count rate threshold in each survey. This low threshold was roughly 60% of the threshold used in the previous EUVE all-sky surveys, and 166 of the objects listed in this table were new EUV sources, appearing neither in the Second EUVE Source Catalog nor in the ROSAT Wide Field Camera Second Catalog. Preliminary identifications are offered for 105 of the 166 sources not previously reported in any EUV catalog: by far the most numerous (81) of the identifications are late-type (F-M) stars, while 18 are other stellar types, only 5 are white dwarfs, and none are extragalactic. The paucity of WDs and extragalactic objects may be explained by a strong horizon effect wherein interstellar absorption strongly limits the effective new-source search volume, and, thereby, selectively favors low-luminosity nearby sources over more luminous but distant objects. Notice that, with the adopted 1.5 arcminute acceptance criterion, about 50 spurious detections are expected. This Browse table was created in July 2003 based on CDS table IX/35/faint.dat. This is a service provided by NASA HEASARC . 1997ApJS..108..545L https://heasarc.gsfc.nasa.gov/W3Browse/all/euvexrtcat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=euvexrtcat& GET text/xml 180 99999 true 351.925 -86.22083333 0.05 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=euvexrtcat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_euvexrtcat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.05 EUV public euvexrtcat All-Sky Catalog of Faint EUV Sources name EUVE Source Designation (Based on J2000 Position) meta.id;meta.main char nullable alt_name Plausible Optical, X-ray or EUV Identification meta.id char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable euve_count_rate EUVE Count Rate (counts/sec) ct/s double nullable xrt_count_rate ROSAT X-Ray Telescope Count Rate (counts/sec) ct/s double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable bii Galactic Latitude degree pos.galactic.lat double nullable euve_xrt_offset Angular Separation between EUVE and X-Ray Positions (arcmin) arcmin double nullable euv_status EUV Status Flags char nullable lii Galactic Longitude degree pos.galactic.lon double nullable