ASCA Large Sky Survey

ASCA Large Sky Survey ASCALSS ivo://nasa.heasarc/ascalss NASA/GSFC HEASARC Ueda et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The ASCA Large Sky Survey (LSS) was the first wide-area unbiased survey with the ASCA satellite in the 0.7 - 10 keV band around the North Galactic Pole region covering a continuous area of 7 square degrees. To make the best use of ASCA's capabilities, the authors developed a new source detection method in which the complicated detector responses were fully taken into account. Applying this method to the entire LSS data independently in the total (0.7 - 7 keV), hard (2 - 10 keV), and soft (0.7 - 2 keV) bands, they detected 107 sources altogether, with sensitivity limits of 6 x 10-14 (0.7 - 7 keV), 1 x 10-13 (2 - 10 keV), and 2 x 10-14 ergs/s/cm2 (0.7 - 2 keV), respectively. The complete list of detected sources is presented in this table. The detection criteria that needed to be satisfied were: (i) the significance of the summed count rate of the GIS and the SIS should exceed 4.5, and (ii) the significance of either the GIS or the SIS should also exceed 3.5. This database was created by the HEASARC in December 2001 based on the ADC/<a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/518/656">CDS Catalog J/ApJ/518/656</a>. This is a service provided by NASA HEASARC . 1999ApJ...518..656U https://heasarc.gsfc.nasa.gov/W3Browse/all/ascalss.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ascalss& GET text/xml 180 99999 true 196.9534 29.4328 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ascalss GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ascalss&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ASCA 0.0833333333333333 X-ray public ascalss ASCA Large Sky Survey name Source Designation (AX JHHMM.m+DDMM) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable count_rate_sis_total SIS Total (0.7-7keV) Band Count Rate (2) ct/s phot.count;em.X-ray double nullable snr_sis_total SIS (Solid-state Imaging Spectrometer) Total (0.7-7keV) Band Significance stat.fit.goodness;em.X-ray double nullable spectral_index Spectrum Photon Index spect.index;em.X-ray double nullable spectral_index_error RMS Uncertainty in Spectral Index stat.error;spect.index;em.X-ray 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 count_rate_sis_soft SIS Soft (0.7-2keV) Band Count Rate (2) ct/s phot.count;em.X-ray.soft double nullable count_rate_sis_hard SIS Hard (2-10KeV) Band Count Rate (2) ct/s phot.count;em.X-ray.medium double nullable count_rate_gis_soft GIS Soft (0.7-2keV) Band Count Rate ct/s phot.count;em.X-ray.soft double nullable bii Galactic Latitude degree pos.galactic.lat double nullable snr_sis_soft SIS Soft (0.7-2keV) Band Significance stat.fit.goodness;em.X-ray.soft double nullable snr_gis_total GIS (Gas Imaging Spectrometer) Total (0.7-7keV) Band Significance stat.fit.goodness;em.X-ray double nullable count_rate_gis_hard GIS Hard (2-10KeV) Band Count Rate ct/s phot.count;em.X-ray.medium double nullable hard_flag Flag Indicates Hardest Source meta.code char nullable lii Galactic Longitude degree pos.galactic.lon double nullable snr_gis_hard GIS Hard (2-10KeV) Band Significance stat.fit.goodness;em.X-ray.medium double nullable snr_gis_soft GIS Soft (0.7-2keV) Band Significance stat.fit.goodness;em.X-ray.soft double nullable snr_sis_hard SIS Hard (2-10KeV) Band Significance stat.fit.goodness;em.X-ray.medium double nullable count_rate_gis_total GIS Total (0.7-7keV) Band Count Rate ct/s phot.count;em.X-ray double nullable