NuSTAR Serendipitous Survey 40-Month Secondary Source Catalog

NuSTAR Serendipitous Survey 40-Month Secondary Source Catalog NUSTARSSC2 ivo://nasa.heasarc/nustarssc2 NASA/GSFC HEASARC Lansbury et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains some of the science results from the Nuclear Spectroscopic Telescope Array (NuSTAR) Serendipitous Survey. The catalog incorporates data taken during the first 40 months of NuSTAR operation, which provide ~20 Ms of effective exposure time over 331 fields, with an areal coverage of 13 deg2. The primary catalog (available as the HEASARC <a href="/W3Browse/nustar/nustarssc.html">NUSTARSSC</a> table) contains 498 sources (the abstract of the reference paper states that there are 497 sources) detected in total over the 3-24 keV energy range. There are 276 sources with spectroscopic redshifts and classifications, largely resulting from the authors' extensive campaign of ground-based spectroscopic follow-up. The authors characterize the overall sample in terms of the X-ray, optical, and infrared source properties. The sample is primarily composed of active galactic nuclei (AGN), detected over a large range in redshift from z = 0.002 to 3.4 (median redshift z of 0.56), but also includes 16 spectroscopically confirmed Galactic sources. There is a large range in X-ray flux, from log (f_3-24_keV) ~ -14 to -11 (in units of erg s-1 cm-2), and in rest-frame 10-40 keV luminosity, from log (L10-40keV) ~ 39 to 46 (in units of erg s-1), with a median of 44.1. Approximately 79% of the NuSTAR sources have lower-energy (<10 keV) X-ray counterparts from XMM-Newton, Chandra, and Swift XRT observations. The mid-infrared (MIR) analysis, using WISE all-sky survey data, shows that MIR AGN color selections miss a large fraction of the NuSTAR-selected AGN population, from ~15% at the highest luminosities (LX > 1044 erg s-1) to ~80% at the lowest luminosities (LX < 1043 erg s-1). The authors' optical spectroscopic analysis finds that the observed fraction of optically obscured AGN (i.e., the type 2 fraction) is FType2 = 53 (+14, -15) per cent, for a well-defined subset of the 8-24 keV selected sample. This is higher, albeit at a low significance level, than the type 2 fraction measured for redshift- and luminosity-matched AGNs selected by < 10 keV X-ray missions. This table contains the Secondary NuSTAR Serendipitous Source Catalog of 64 sources found using wavdetect to search for significant emission peaks in the FPMA and FPMB data separately (see Section 2.1.1 of Alexander et al. 2013, ApJ, 773, 125) and in the combined A+B data. These sources are listed in Table 7 of the reference paper. This method was developed alongside the primary one (Section 2.3 of the reference paper) in order to investigate the optimum source detection methodologies for NuSTAR and to identify sources in regions of the NuSTAR coverage that are automatically excluded in the primary source detection. The authors emphasize that these secondary sources are not used in any of the science analyses presented in their paper. Nevertheless, these secondary sources are robust NuSTAR detections, some of which will be incorporated in future NuSTAR studies, and for many of them (35 out of the 43 sources with spectroscopic identifications) the authors have obtained new spectroscopic redshifts and classifications through their follow-up program. The X-ray photometric parameters for 4 sources are left blank as in these cases the A+B data prohibit reliable photometric constraints. Additional information on these Secondary Catalog sources that the authors obtained using optical spectroscopy is available in Table 8 of the reference paper (q.v.). This table does NOT contain the the 498 sources in the <a href="/W3Browse/nustar/nustarssc.html">Primary NuSTAR Serendipitous Source Catalog</a> that were found using the source detection procedure described in Section 2.3 of the reference paper, and that are listed in Table 5 (op. cit.). This table was created by the HEASARC in July 2017 based on the machine-readable version of Table 7 from the reference paper, the Secondary NuSTAR Serendipitous Source Catalog, that was obtained from the ApJ web site. This is a service provided by NASA HEASARC . 2017ApJ...836...99L https://heasarc.gsfc.nasa.gov/W3Browse/all/nustarssc2.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=nustarssc2& GET text/xml 180 99999 true 213.48702 -65.366013 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=nustarssc2 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_nustarssc2&Action=More+Options&Action=Parameter+Search&ConeAdd=1 NUSTAR 0.0333333333333333 X-ray public nustarssc2 NuSTAR Serendipitous Survey 40-Month Secondary Source Catalog name Unique NuSTAR Source Designation 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 sb_flux Observed-Frame Soft Flux erg/s/cm^2 phot.flux;em.X-ray.medium double nullable sb_flux_error The 84% Confidence Level in Soft Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray.medium double nullable sb_net_counts Net Soft Band Counts ct phot;em.X-ray.medium double nullable sb_net_counts_error The Error in Net Soft Band Counts ct stat.error;phot;em.X-ray.medium double nullable hb_flux Observed-Frame Hard Flux erg/s/cm^2 phot.flux;em.X-ray double nullable hb_flux_error The 84% Confidence Level in Hard Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable hb_net_counts Net Hard Band Counts ct phot;em.X-ray double nullable hb_net_counts_error The Error in Net Hard Band Counts ct stat.error;phot;em.X-ray double nullable redshift Spectroscopic Redshift src.redshift double nullable rf_hardxray_luminosity Non-Absorption-Corrected, Rest-Frame 10-40 keV Luminosity erg/s phys.luminosity;em.X-ray.hard 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 opt_dec Other Counterpart Declination degree pos.eq.dec double nullable fb_net_counts Net Full Band Counts ct phot;em.X-ray double nullable softxray_ctrpart_ra Lower Energy X-Ray Counterpart Right Ascension degree pos.eq.ra double nullable sb_bck_counts Soft Background Counts ct phot;instr.background;em.X-ray.medium double nullable softxray_ctrpart_orig Lower Energy X-Ray Counterpart Observatory Code meta.ref;obs char nullable fb_counts Total Full Band (3-24 keV) Counts ct phot;em.X-ray double nullable hb_counts Total Hard Band (8-24 keV) Counts ct phot;em.X-ray double nullable opt_ctrpart_orig Other, Optical or WISE, Counterpart Observatory Code meta.ref;obs char nullable softxray_ctrpart_dec Lower Energy X-Ray Counterpart Declination degree pos.eq.dec double nullable source_number Sequential Identification Number for Each Source in the Catalog meta.id;src short nullable hb_net_rate Net Hard Count Rate, Aperture-Corrected ct/s phot.count;em.X-ray double nullable sb_net_rate Net Soft Count Rate, Aperture-Corrected ct/s phot.count;em.X-ray.medium double nullable fb_net_rate Net Full Count Rate, Aperture-Corrected ct/s phot.count;em.X-ray double nullable primary_exclude_code Primary Catalog Code meta.code;src char nullable hb_exposure Hard Band Exposure Time s time.duration;obs.exposure;em.X-ray double nullable hb_bck_counts Hard Background Counts ct phot;instr.background;em.X-ray double nullable sb_counts Total Soft Band (3-8 keV) Counts ct phot;em.X-ray.medium double nullable sb_net_rate_error The Error in Net Soft Count Rate ct/s stat.error;phot.count;em.X-ray.medium double nullable bii Galactic Latitude degree pos.galactic.lat double nullable fb_net_rate_error The Error in Net Full Count Rate ct/s stat.error;phot.count;em.X-ray double nullable hb_net_rate_error The Error in Net Hard Count Rate ct/s stat.error;phot.count;em.X-ray double nullable fb_net_counts_error The Error in Net Full Band Counts ct stat.error;phot;em.X-ray double nullable fb_flux_error The 84% Confidence Level in Full Flux erg/s/cm^2 stat.error;phot.flux;em.X-ray double nullable fb_bck_counts Full Background Counts ct phot;instr.background;em.X-ray double nullable sb_exposure Soft Band Exposure Time s time.duration;obs.exposure;em.X-ray.medium double nullable opt_ra Other Counterpart Right Ascension degree pos.eq.ra double nullable fb_flux Observed-Frame Full Flux erg/s/cm^2 phot.flux;em.X-ray double nullable fb_exposure Full Band Exposure Time s time.duration;obs.exposure;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable