MYSTIXMPCM ivo://nasa.heasarc/mystixmpcm NASA/GSFC HEASARC Broos et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Massive Young Star-forming complex Study in Infrared and X-rays (MYStIX) project requires samples of young stars that are likely members of 20 nearby Galactic massive star-forming regions. Membership is inferred from statistical classification of X-ray sources, from detection of a robust infrared excess that is best explained by circumstellar dust in a disk or infalling envelope and from published spectral types that are unlikely to be found among field stars. This table contains the MYStIX membership lists, which total 31,549 probable complex members. In their reference paper, the authors describe in detail the statistical classification of X-ray sources via a "Naive Bayes Classifier". These membership lists provide the empirical foundation for subsequent MYStIX science studies. The MYStIX project, described by Feigelson et al. (2013, ApJS, 209, 26), seeks to identify and study samples of young stars in 20 nearby (0.4 < D < 3.6kpc) Galactic massive star-forming regions (MSFRs). These samples are derived using X-ray data from the Chandra X-ray Observatory, near-infrared (NIR) photometry from the United Kingdom InfraRed Telescope (UKIRT) and from the Two Micron All Sky Survey (2MASS), mid-infrared (MIR) photometry from the Spitzer Space Telescope, and from published spectroscopically-identified massive stars. The purpose of this study is to describe the authors' efforts to minimize contaminants in the MYStIX catalogs of young stars. They refer to these latter objects as the "MYStIX Probable Complex Members" or MPCMs. This table contains the combined MPCM catalog for all 20 of the MYStIX MSFRs. This MPCM catalog is the union of three sets of probable members identified by three different established methods for identifying young stars (see Feigelson et al. 2013, ApJS, 209, 26, Fig. 3). Most of the X-ray information on the MPCMs (with the exception of the X-ray luminosities and absorbing column densities obtained using XPHOT) was produced by the ACIS Extract (AE) software package (Broos et al. 2010, ApJ, 714, 1582 and 2012, Astrophysics Source Code Library, 1203.001). The AE software and User's Guide are available at <a href="http://www.astro.psu.edu/xray/acis/acis_analysis.html">http://www.astro.psu.edu/xray/acis/acis_analysis.html</a>. X-ray quantities using the 'fb' prefix are for the full or total energy band from 0.5 - 8.0 keV, those using the 'sb' prefix are for the soft band from 0.5 - 2.0 keV, and those using the 'hb' prefix are for the hard band from 2.0 - 8.0 keV. L. K. Townsley and P. S. Broos (2013, in preparation) and Kuhn et al. (2013, ApJS, 209, 27) identify a few very bright X-ray sources in each region that suffer from a type of instrumental non-linearity known as photon pile-up (<a href="http://cxc.harvard.edu/ciao/why/pileup_intro.html">http://cxc.harvard.edu/ciao/why/pileup_intro.html</a>); X-ray properties reported for those sources are biased and should be used with caution. This table was created by the HEASARC in February 2014 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/209/32">CDS Catalog J/ApJS/209/32</a> file mpcm.dat. This is a service provided by NASA HEASARC . 2013ApJS..209...32B https://heasarc.gsfc.nasa.gov/W3Browse/all/mystixmpcm.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=mystixmpcm& GET text/xml 180 99999 true 167.948158 -61.486219 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=mystixmpcm GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_mystixmpcm&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Infrared Optical X-ray public mystixmpcm Massive Young Star-Forming Complex Stdy in IR & X-Rays: MYStIX P sfr_name MYStIX Galactic Massive Star-Forming Region (MSFR) Designation meta.id.assoc char nullable name IAU Source Designation (MPCM 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 jmag J-Band Magnitude mag phot.mag;em.IR.J double nullable jmag_error 1-Sigma Uncertainty for J-Band Magnitude mag stat.error;phot.mag;em.IR.J double nullable spect_type MK Spectral Type src.spType char 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 hb_counts_pos_err 1-Sigma Upper Error on Net Hard Counts ct stat.error;phot;em.X-ray.medium double nullable sb_counts_pos_err 1-Sigma Upper Error on Net Soft Counts ct stat.error;phot;em.X-ray.soft double nullable h3_posterior H3 Class Posterior Probability stat.probability double nullable h1_prior H1 Class Prior Probability (Position-Dependent) stat.probability double nullable log_nh_stat_err 1-Sigma Statistical Uncertainty for Logarithm of Gas Column Density cm^-2 stat.error;phys.columnDensity double nullable fb_median_energy Median 0.5-8keV Energy, Observed Spectrum keV phys.energy double nullable hb_lx_obs X-Ray Luminosity, 2-8 keV erg/s phys.luminosity;em.X-ray.medium double nullable hmag_flag UKIRT Photometry Flag for H-Band Magnitude meta.code;phot.mag;em.IR.H char nullable afterglow_fraction Suspected Afterglow Fraction meta.code;instr.det double nullable h1_posterior H1 Class Posterior Probability stat.probability double nullable h4_posterior H4 Class Posterior Probability stat.probability double nullable ob_cat_mag_band Visual Band for OB Catalog Magnitude (J, K or V) instr.bandpass char nullable glimpse_5p8_um_flag GLIMPSE Photometry Flag for Spitzer/IRAC 5.8um Band Magnitude meta.code;phot.mag;em.IR.4-8um int nullable ref_jmag Origin of J-Band Magnitude Photometry meta.ref;phot.mag;em.IR.J char nullable fb_counts_neg_err 1-Sigma Lower Error on Net Total Counts ct stat.error;phot;em.X-ray double nullable kmag_flag UKIRT Photometry Flag for K-Band Magnitude meta.code;phot.mag;em.IR.K char nullable fb_lx Absorption-Corrected X-Ray Luminosity, 0.5-8 keV erg/s phys.luminosity;em.X-ray double nullable glimpse_kmag_flag GLIMPSE Photometry Flag for K-Band Magnitude meta.code;phot.mag;em.IR.K short nullable hb_lx Absorption-Corrected X-Ray Luminosity, 2-8 keV erg/s phys.luminosity;em.X-ray.medium double nullable ire_source_number Zero-Based Index in IR Excess Catalog (Povich et al. 2013, Cat. J/ApJS/209/31) meta.id.cross;em.IR short nullable irac_8p0_um_mag_error 1-Sigma Uncertainty for Spitzer/IRAC 8.0um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable irac_8p0_um_mag Spitzer/IRAC 8.0um Band Magnitude mag phot.mag;em.IR.4-8um double nullable kmag K-Band Magnitude mag phot.mag;em.IR.K double nullable h2_dominant_factor H2 Dominant Classification Term meta.code;stat.probability short nullable hb_lx_stat_err 1-Sigma Statistical Uncertainty for 2-8keV Absorption-Corrected X-Ray Luminosity erg/s stat.error;phys.luminosity;em.X-ray.medium double nullable fb_lx_obs X-Ray Luminosity, 0.5-8 keV erg/s phys.luminosity;em.X-ray double nullable merged_ks_prob p-Value for Merged Observations stat.probability double nullable twomass_quality_flag 2MASS Quality Photometry Flag meta.code.qual;em.IR char nullable sed_class SED Classification src.class;spect short nullable kmag_error 1-Sigma Uncertainty for K-Band Magnitude mag stat.error;phot.mag;em.IR.K double nullable xray_class_code X-Ray Classification meta.code;src.class short nullable ref_irac_5p8_um_mag Origin of 5.8um-Band Magnitude Photometry meta.ref;phot.mag;em.IR.4-8um char nullable internal_xray_name X-Ray Source Designation Used within the MYStIX Project meta.id.cross;em.X-ray char nullable xray_name X-Ray Source Designation in IAU Format (CXO JHHMMSS.s+DDMMSS) meta.id.cross;em.X-ray char nullable fb_lx_stat_err 1-Sigma Statistical Error for 0.5-8keV Absorption-Corrected X-Ray Luminosity erg/s stat.error;phys.luminosity;em.X-ray double nullable ref_kmag Origin of K-Band Magnitude Photometry meta.ref;phot.mag;em.IR.K char nullable fb_counts Net Total (0.5-8keV) Counts in Merged Apertures ct phot;em.X-ray double nullable local_spitzer_flag Local Spitzer Photometry Flag meta.code;phot.mag;em.IR.4-8um short nullable class Browse Object Classification src.class short nullable irac_5p8_um_mag Spitzer/IRAC 5.8um Band Magnitude mag phot.mag;em.IR.4-8um double nullable fb_lx_sys_err 1-Sigma Systematic Error for 0.5-8keV Absorption-Corrected X-Ray Luminosity erg/s stat.error.sys;phys.luminosity;em.X-ray double nullable hb_lx_sys_err 1-Sigma Systematic Uncertainty for 2-8keV Absorption-Corrected X-Ray Luminosity erg/s stat.error.sys;phys.luminosity;em.X-ray.medium double nullable ob_cat_mag Visual Photometry in OB Catalog mag phot.mag double nullable irac_3p6_um_mag_error 1-Sigma Uncertainty for Spitzer/IRAC 3.6um Band Magnitude mag stat.error;phot.mag;em.IR.3-4um double nullable yso_stage YSO Stage src.class short nullable twomass_flag 2MASS Photometry Flag meta.code;em.IR char nullable hmag_error 1-Sigma Uncertainty for H-Band Magnitude mag stat.error;phot.mag;em.IR.H double nullable frac_expo Fraction of Exposure in Which Source Was Observed meta.code;time.duration;obs.exposure double nullable glimpse_hmag_flag GLIMPSE Photometry Flag for H-Band Magnitude meta.code;phot.mag;em.IR.H short nullable num_obs_merged Number of Observations Merged to Estimate Photometry Properties meta.number;obs short nullable ref_hmag Origin of H-Band Magnitude Photometry meta.ref;phot.mag;em.IR.H char nullable ref_irac_3p6_um_mag Origin of 3.6um-Band Magnitude Photometry meta.ref;phot.mag;em.IR.3-4um char nullable hmag H-Band Magnitude mag phot.mag;em.IR.H double nullable off_axis_max Largest Off-Axis Angle for Merged Observations arcmin instr.offset;stat.max double nullable num_obs_extracted Total Number of Observations Extracted meta.number;obs short nullable h4_prior H4 Class Prior Probability (Position-Dependent) stat.probability double nullable vmag_extinction Visual Extinction mag phys.absorption;em.opt.V double nullable bii Galactic Latitude degree pos.galactic.lat double nullable position_origin Origin of Position meta.ref char nullable error_radius 1-Sigma Position Uncertainty arcsec stat.error;pos double nullable h2_posterior H2 Class Posterior Probability stat.probability double nullable ref_spect_type Reference for Spectral Type meta.ref;src.spType char nullable xray_nir_prob_cp Counterpart Probability, X-Ray/NIR stat.probability double nullable sb_log_photon_flux Logarithm of Incident Photon Flux in Soft 0.5-2 keV Band log(photon/cm^2/s) phot.flux;em.X-ray.soft double nullable glimpse_4p5_um_flag GLIMPSE Photometry Flag for Spitzer/IRAC 4.5um Band Magnitude meta.code;phot.mag;em.IR.4-8um int nullable log_nh_sys_err 1-Sigma Systematic Uncertainty for Logarithm of Gas Column Density cm^-2 stat.error;phys.columnDensity double nullable ref_irac_4p5_um_mag Origin of 4.5um-Band Magnitude Photometry meta.ref;phot.mag;em.IR.4-8um char nullable xray_source_number Zero-Based Index in X-Ray Catalog meta.id.cross;em.X-ray int nullable xray_mir_prob_cp Counterpart Probability, X-Ray/MIR stat.probability double nullable hb_log_photon_flux Logarithm of Incident Photon Flux in Hard 2-8 keV Band log(photon/cm^2/s) phot.flux;em.X-ray.medium double nullable fb_counts_pos_err 1-Sigma Upper Error on Net Total Counts ct stat.error;phot;em.X-ray double nullable jmag_flag UKIRT Photometry Flag for J-Band Magnitude meta.code;phot.mag;em.IR.J char nullable glimpse_jmag_flag GLIMPSE Photometry Flag for J-Band Magnitude meta.code;phot.mag;em.IR.J short nullable h3_prior H3 Class Prior Probability (Position-Dependent) stat.probability double nullable h2_prior H2 Class Prior Probability (Position-Dependent) stat.probability double nullable nir_name Source Designation in NIR Catalog meta.id.cross;em.IR char nullable glimpse_3p6_um_flag GLIMPSE Photometry Flag for Spitzer/IRAC 3.6um Band Magnitude meta.code;phot.mag;em.IR.3-4um int nullable off_axis_min Smallest Off-Axis Angle for Merged Observations arcmin instr.offset;stat.min double nullable nir_label Label in NIR Catalog meta.id.cross;em.IR char nullable single_ks_prob p-Value for Single Observation stat.probability double nullable irac_5p8_um_mag_error 1-Sigma Uncertainty for Spitzer/IRAC 5.8um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable sb_counts Net Soft (0.5-2 keV) Counts in Merged Apertures ct phot;em.X-ray.soft double nullable nominal_exposure Total Exposure Time in Merged Observations s time.duration;obs.exposure double nullable hb_counts Net Hard (2-8 keV) Counts in Merged Apertures ct phot;em.X-ray.medium double nullable irac_4p5_um_mag_error 1-Sigma Uncertainty for Spitzer/IRAC 4.5um Band Magnitude mag stat.error;phot.mag;em.IR.4-8um double nullable sb_counts_neg_err 1-Sigma Lower Error on Net Soft Counts ct stat.error;phot;em.X-ray.soft double nullable ref_irac_8p0_um_mag Origin of 8.0um-Band Magnitude Photometry meta.ref;phot.mag;em.IR.4-8um char nullable irac_3p6_um_mag Spitzer/IRAC 3.6um Band Magnitude mag phot.mag;em.IR.3-4um double nullable glimpse_8p0_um_flag GLIMPSE Photometry Flag for Spitzer/IRAC 8.0um Band Magnitude meta.code;phot.mag;em.IR.4-8um int nullable psf_fraction Average PSF Fraction (at 1.5 keV) for Merged Observations instr.det.psf double nullable fb_total_counts Extracted Total (0.5-8keV) Counts in Merged Apertures ct phot;em.X-ray int nullable off_axis Average Off-Axis Angle Theta for Merged Observations arcmin instr.offset double nullable prob_no_src_min p-Value for No-Source Hypothesis stat.probability;stat.min double nullable fb_log_photon_flux Logarithm of Incident Photon Flux in Total 0.5-8 keV Band log(photon/cm^2/s) phot.flux;em.X-ray double nullable mir_label Label in MIR Catalog meta.id.cross;em.IR char nullable hb_counts_neg_err 1-Sigma Lower Error on Net Hard Counts ct stat.error;phot;em.X-ray.medium double nullable lii Galactic Longitude degree pos.galactic.lon double nullable irac_4p5_um_mag Spitzer/IRAC 4.5um Band Magnitude mag phot.mag;em.IR.4-8um double nullable mir_name Source Designation in MIR Catalog meta.id.cross;em.IR char nullable log_nh Logarithm of Gas Column Density cm^-2 phys.columnDensity double nullable ob_cat_label Label in OB Catalog meta.id.cross char nullable