ASCA/AGN ivo://nasa.heasarc/tartarus NASA/GSFC HEASARC Turner, Nandra, Turcan, George 2026-04-24 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov AGN The Tartarus database contains the results of a detailed but systematic analysis of ASCA observations of active galactic nuclei (AGN). It contains source and background events files, spectra, ancillary response files and response matrices, images, and assorted light curves for a large number of ASCA AGN observations. Spectral fit results are done by automatic XSPEC fitting. This database table allows easy access to reduced AGN data for the whole community, allowing the maximum scientific return from the data. Availability of publishable light curves, images, and spectra (which can also be readily re-fitted) should be particularly valuable to astronomers with little direct experience in the reduction of X-ray data. Version 3.1 has been created by analyzing all ASCA observing sequences with targets designated as AGN, as indicated by a leading "7" in the ASCA observing sequence number. Version 3.1 contains products for all 611 observing sequences designated as AGN observations. This is a significant improvement over Versions 1 and 2. Moreover, the 611 sequences for which products are available are complete in the sense that either the target object was not detected (in which case an upper limit on GIS2 source counts is given) or the intended AGN target was detected and the data were fully analyzed. In order to obtain the most accurate background subtraction and minimize contamination from any nearby sources, version 3.1 makes more use of custom extraction regions than previous versions. It is expected that version 3.1 will be replaced when the final ASCA calibration is completed. This database table has been created by the Tartarus Team, and they, rather than Imperial College London or the HEASARC, are responsible for the contents. It was ingested by the HEASARC in August, 2005. This is a service provided by NASA HEASARC . 2001AIPC..599..991T https://heasarc.gsfc.nasa.gov/W3Browse/all/tartarus.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=tartarus& GET text/xml 180 99999 true 5.47416667 -79.16888889 0.5 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=tartarus GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_tartarus&Action=More+Options&Action=Parameter+Search&ConeAdd=1 https://heasarc.gsfc.nasa.gov/xamin/vo/sia?table=tartarus& GET text/xml+votable POS Search Position in the form "ra,dec" where ra and dec are given in decimal degrees in the ICRS coordinate system. degrees real SIZE Size of search region in the RA and Dec. directions. degrees real FORMAT Requested format of images. string CFRAME Coordinate frame: ICRS, FK5, FK4, GAL, ECL string EQUINOX Equinox used in FK4 or FK5 frames. real Cutout 360.0 180.0 360.0 180.0 5000 10000000 500 5.47416667 -79.16888889 0.5 0.5 https://heasarc.gsfc.nasa.gov/xamin/vo/sia?table=tartarus& GET text/xml+votable POS Search Position in the form "ra,dec" where ra and dec are given in decimal degrees in the ICRS coordinate system. Cutout 5.47416667 -79.16888889 0.5 0.5 ASCA 0.5 X-ray public tartarus Tartarus: Reduced ASCA AGN Data (Version 3.1) seq_num Unique Identifier of the ASCA Observation Sequence meta.id;meta.main int nullable name Tartarus Source Designation 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 start_time Date and Time (UT) of the Start of the Observation mjd time.start;obs double nullable exposure Total Time (in seconds) That the Target Was Exposed to the Detectors (SIS0) s time.duration;obs.exposure int nullable detection_sig Significance of the Detection of the Target Object in the GIS2 Sky Image double nullable detection_flag Flag Indicates Detection (Detection Significance >= 5 Sigma) char nullable hard_flux SIS0 Flux of the Best-Fitting Absorbed Power-Law Model erg/cm^2/s double nullable hard_gamma Best-Fitting Photon Index from an Absorbed Power-Law Model double nullable hard_nh Best-Fitting Column Density from an Absorbed Power-Law Model (cm^-2) H-atoms/cm^2 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 red_chi_sq Reduced Chi-Squared of the Best-Fitting Absorbed Power-Law Model double nullable sis0_full SIS0 Full-Band (sis_low - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable sis1_soft SIS1 Soft-Band (sis_low - 2 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable veron_redshift Redshift of the Veron 2001 Object Closest to Target Object double nullable sis1_hard SIS1 Hard-Band (2 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable bii Galactic Latitude degree pos.galactic.lat double nullable veron_num Number of Veron 2001 Objects within the GIS Field-of-View short nullable elapsed_time Elapsed Time (in seconds) of the Observation (SIS0) s int nullable asca_name ASCA Designation of the Object Observed char nullable veron_dec Declination (J2000) of the Veron 2001 Object Closest to Target Object char nullable sis_low Lower Energy Boundary for SIS Data (keV) keV float nullable gis2_full GIS2 Full-Band (0.75 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable gis3_full GIS3 Full-Band (0.75 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable data_mode Telemetry Mode in Which Most Data for an Observation Were Collected char nullable lii Galactic Longitude degree pos.galactic.lon double nullable gis2_hard GIS2 Hard-Band (2 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable dof Degrees of Freedom of the Best-Fitting Absorbed Power-Law Model short nullable veron_type Classification of the Veron 2001 Object Closest to Target Object char nullable gis3_hard GIS3 Hard-Band (2 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable sis0_hard SIS0 Hard-Band (2 - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable veron_ra Right Ascension (J2000) of the Veron 2001 Object Closest to Target Object char nullable veron_name Name of the Veron 2001 Object Closest to Target Object char nullable sis0_soft SIS0 Soft-Band (sis_low - 2 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable ccd_mode SIS Clocking Mode, Number of Chips (1, 2, or 4) Used Per SIS Detector short nullable sis1_full SIS1 Full-Band (sis_low - 10 keV), Background-Subtracted Count Rate (ct/s) ct/s double nullable