SFINCSXRAY ivo://nasa.heasarc/sfincsxray NASA/GSFC HEASARC Getman et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Star Formation in Nearby Clouds (SFiNCs) project is aimed at providing a detailed study of the young stellar populations and of star cluster formation in the nearby 22 star-forming regions (SFRs) for comparison with our earlier MYStIX survey of richer, more distant clusters. As a foundation for the SFiNCs science studies, in the reference paper homogeneous data analyses of the Chandra X-ray and Spitzer mid-infrared archival SFiNCs data are described, and the resulting catalogs of over 15,300 X-ray and over 1,630,000 mid-infrared point sources are presented. On the basis of their X-ray/infrared properties and spatial distributions, nearly 8500 point sources have been identified as probable young stellar members of the SFiNCs regions. Compared to the existing X-ray/mid-infrared publications, the SFiNCs member list increases the census of YSO members by 6%-200% for individual SFRs and by 40% for the merged sample of all 22 SFiNCs SFRs. Sixty-five X-ray observations of the 22 SFiNCs SFRs made with the imaging array on the Advanced CCD Imaging Spectrometer (ACIS) were extracted from the Chandra archive (spanning from 2000 January to 2015 April). See Tables 1 and 2 of the reference paper for the list of SFRs and the log of Chandra ACIS observations, respectively. The final Chandra-ACIS catalog for the 22 SFiNCs SFRs comprises 15,364 X-ray sources (presented in Tables 3 and 4 and section 3.2 of the reference paper, and the contents of this HEASARC table, SFINCSXRAY). To obtain MIR photometry for X-ray objects and to identify and measure MIR photometry for additional non-Chandra disky stars that were missed in previous studies of the SFiNCs regions (typically faint YSOs), the authors have reduced the archived Spitzer-IRAC data by homogeneously applying the MYStIX-based Spitzer-IRAC data reduction methods of Kuhn et al. (2013, ApJS, 209, 29) to the 423 Astronomical Object Request (AORs) data sets for the 22 SFiNCs SFRs (Table 5 of the reference paper). As in MYStIX, the SFiNCs IRAC source catalog retains all point sources with the photometric signal-to-noise ratio > 5 in both [3.6] and [4.5] um channels. This catalog covers the 22 SFiNCs SFRs and their vicinities on the sky and comprises 1,638,654 IRAC sources with available photometric measurements for 100%, 100%, 29%, and 23% of these sources in the 3.6, 4.5, 5.8, and 8.0um bands, respectively (see table 6 and section 3.4 of the reference paper). Source position cross-correlations between the SFiNCs Chandra X-ray source catalog and an IR catalog, either the "cut-out" IRAC or 2MASS, were made using the steps described in section 3.5 of the reference paper. Tables 7 and 8 of the reference paper provide the list of 8,492 SFiNCs probable cluster members (SPCMs) and their main IR and X-ray properties (see section 4 of the reference paper): this list as available at the HEASARC as the SFINCSPCM table (q.v.). This table was created by the HEASARC in September 2017 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/229/28">CDS Catalog J/ApJS/229/28</a> files table3.dat (the list of SFiNCs X-ray sources and their basic properties) and table4.dat (the list of SFiNCs X-ray source fluxes). This is a service provided by NASA HEASARC . 2017ApJS..229...28G https://heasarc.gsfc.nasa.gov/W3Browse/all/sfincsxray.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sfincsxray& GET text/xml 180 99999 true 258.071155 -38.658519 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sfincsxray GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sfincsxray&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public sfincsxray Star Formation in Nearby Clouds (SFiNCs) X-Ray Source Catalog sfr_name Star Formation Region Identifier meta.id.assoc char nullable sfr_source_number X-Ray Source Unique Number within the Star Formation Region (Sorted by RA) meta.id short nullable name Chandra Source Designation (CXOU JHHMMSS.ss+DDMMSS.s) 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 fb_counts Total Band (0.5-8keV) Net Counts ct phot;em.X-ray double nullable fb_counts_error The 1-Sigma Uncertainty in Total Band (0.5-8keV) Net Counts ct stat.error;phot;em.X-ray double nullable fb_log_corr_flux XPHOT Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) phot.flux;em.X-ray double nullable fb_log_corr_flux_error 1-Sigma Statistical Error in Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) stat.error;phot.flux;em.X-ray double nullable fb_log_corr_flux_sys_err 1-Sigma Systematic Error in Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) stat.error.sys;phot.flux;em.X-ray double nullable fb_snr Photometric Significance stat.snr;phot;em.X-ray double nullable source_anomaly_flags Flags Indicate Source Anomaly meta.code;src char nullable log_fb_prob_no_src_limit Limit Flag for Logarithm of Probability meta.code;stat.probability;phot;em.X-ray char nullable log_fb_prob_no_src Logarithm of Probability That Extracted Full Band Counts Are from Background stat.probability;phot;em.X-ray double nullable lii Galactic Longitude degree pos.galactic.lon double nullable off_axis Off-Axis Angle arcmin instr.offset double nullable hb_log_corr_flux_sys_err 1-Sigma Systematic Error in Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) stat.error.sys;phot.flux;em.X-ray.medium double nullable fb_log_flux XPHOT Logarithm of Apparent Total Band Flux log(erg/s/cm^2) phot.flux;em.X-ray double nullable log_nh XPHOT Logarithm of Hydrogen Column Density log(cm^-2) phys.columnDensity double nullable hb_log_photon_flux AE Logarithm of Hard Band (2-8keV) Photon Flux log(ct/cm^2/s) phot.flux;em.X-ray.medium double nullable psf_fraction Fraction of PSF instr.det.psf double nullable median_energy Background-Corrected Total Band Median Photon Energy keV phys.energy double nullable hb_log_corr_flux_error 1-Sigma Statistical Error in Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) stat.error;phot.flux;em.X-ray.medium double nullable log_nh_sys_err 1-Sigma Systematic Error in Logarithm of Hydrogen Column Density log(cm^-2) stat.error.sys;phys.columnDensity double nullable hb_log_flux XPHOT Logarithm of Apparent Hard Band Flux log(erg/s/cm^2) phot.flux;em.X-ray.medium double nullable fb_log_flux_error The 1-Sigma Uncertainty in Logarithm of Apparent Total Band Flux log(erg/s/cm^2) stat.error;phot.flux;em.X-ray double nullable hb_log_flux_error The 1-Sigma Uncertainty in Logarithm of Apparent Hard Band Flux log(erg/s/cm^2) stat.error;phot.flux;em.X-ray.medium double nullable bii Galactic Latitude degree pos.galactic.lat double nullable fb_bck_counts Total Band Background Counts ct phot;instr.background;em.X-ray double nullable source_variable_flag Flag [a-c] Indicates Variability Characterization meta.code;src.var char nullable error_radius Estimated Standard Deviation in Position arcsec stat.error;pos double nullable hb_counts Hard Band (2-8keV) Net Counts ct phot;em.X-ray.medium double nullable hb_log_corr_flux XPHOT Logarithm of Corrected Hard Band Flux log(erg/s/cm^2) phot.flux;em.X-ray.medium double nullable log_nh_error 1-Sigma Statistical Error in Logarithm of Hydrogen Column Density log(cm^-2) stat.error;phys.columnDensity double nullable fb_log_photon_flux AE Logarithm of Total Band (0.5-8keV) Photon Flux log(ct/cm^2/s) phot.flux;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