SFINCSPCM ivo://nasa.heasarc/sfincspcm NASA/GSFC HEASARC Getman et al. 2026-04-03 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Star 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 the authors' 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 (MIR) 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 available as the 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 (listed in 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. Using the ensemble of X-ray and infrared data that they have obtained, the authors selected probable YSOs in the 22 SFRs using selection criteria described in section 4.1 of the reference paper. Tables 7 and 8 of the reference paper provide the list of 8,492 SFiNCs probable cluster members (SPCMs: but see below for a caveat on this number) and their main IR and X-ray properties (see section 4 of the reference paper). This present HEASARC table comprises the contents of these two tables. A fuller list of the X-ray properties of the X-ray-detected SPCMs is available in the HEASARC's SFINCSXRAY 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 table7.dat (the IR photometry of the SFiNCs probable cluster members) and table8.dat (the main X-ray and other properties of the SFiNCs probable cluster members). This is a service provided by NASA HEASARC . 2017ApJS..229...28G https://heasarc.gsfc.nasa.gov/W3Browse/all/sfincspcm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sfincspcm& GET text/xml 180 99999 true 257.866958 -38.700644 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sfincspcm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sfincspcm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Infrared X-ray public sfincspcm Star Formation in Nearby Clouds (SFiNCs) Probable Cluster Member jmag 2MASS J Band Magnitude mag phot.mag;em.IR.J double nullable bii Galactic Latitude degree pos.galactic.lat double nullable irac_3p6_um_mag_error The 1-Sigma Uncertainty in 3.6um Band Magnitude mag stat.error;phot.mag;em.IR.3-4um double nullable irac_alpha_error Error in Alpha stat.error;spect.index;em.IR double nullable twomass_flags 2MASS Source Flags meta.code;src char nullable twomass_name 2MASS Source Designation (2MASS JHHMMSSss+DDMMSSs) meta.id.cross char nullable "__x_ra_dec" System unit vector column double nullable stellar_age Stellar Age Myr time.age double nullable median_energy Background-Corrected Total Band Median Photon Energy keV phys.energy double nullable name Source Designation (SPCM JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char nullable irac_alpha Apparent SED Slope spect.index;em.IR double nullable hmag_error Uncertainty in 2MASS H Band Magnitude mag stat.error;phot.mag;em.IR.H double nullable abs_vmag The V Band Extinction mag phys.magAbs;em.opt.V double nullable log_nh XPHOT Logarithm Hydrogen Column Density log(cm^-2) phys.columnDensity double nullable "__z_ra_dec" System unit vector column double nullable irac_3p6_um_mag Spitzer/IRAC 3.6um Band Magnitude mag phot.mag;em.IR.3-4um double nullable "__y_ra_dec" System unit vector column double nullable xfov_flag XFOV Flag meta.code char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable irac_8p0_um_mag_error The 1-Sigma Uncertainty in 8.0um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable irac_5p8_um_mag_error The 1-Sigma Uncertainty in 5.8um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable dec Declination degree pos.eq.dec;meta.main double nullable xray_ir_match_note X-Ray-IR Source Match Note meta.note char nullable "__row" System index column char nullable hmag 2MASS H Band Magnitude mag phot.mag;em.IR.H double nullable ks_mag 2MASS K_s Band Magnitude mag phot.mag;em.IR.K double nullable irac_name IRAC Source Designation (SSTU GLLL.llll+BB.bbbb) meta.id.cross char nullable ks_mag_error Uncertainty in 2MASS K_s Band Magnitude mag stat.error;phot.mag;em.IR.K double nullable irac_5p8_um_mag Spitzer/IRAC 5.8um Band Magnitude mag phot.mag;em.IR.4-8um double nullable sfr_name Star Formation Region Identifier meta.id.assoc char nullable fb_counts Total Band (0.5-8keV) Net Counts ct phot;em.X-ray double nullable internal_acis_label Internal ACIS Source Label meta.id char nullable lii Galactic Longitude degree pos.galactic.lon double nullable irac_4p5_um_mag_error The 1-Sigma Uncertainty in 4.5um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable irac_4p5_um_mag Spitzer/IRAC 4.5um Band Magnitude mag phot.mag;em.IR.4-8um double nullable yso_class YSO Class(es) src.class char nullable jmag_error Uncertainty in 2MASS J Band Magnitude mag stat.error;phot.mag;em.IR.J double nullable fb_log_photon_flux AE Logarithm Total Band Photon Flux log(ct/cm^2/s) phot.flux;em.X-ray double nullable irac_8p0_um_mag Spitzer/IRAC 8.0um Band Magnitude mag phot.mag;em.IR.4-8um double nullable log_lx Logarithm Total Band Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable ob_star_note Known OB-Type Star Note meta.note char nullable