MYSTIXIRES ivo://nasa.heasarc/mystixires NASA/GSFC HEASARC Povich 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 provides a comparative study of 20 Galactic massive star-forming complexes with distances between 0.4 and 3.6 kpc. Probable stellar members in each target complex are identified using X-ray and/or infrared data via two pathways: (1) X-ray detections of young/massive stars with coronal activity/strong winds or (2) infrared excess (IRE) selection of young stellar objects (YSOs) with circumstellar disks and/or protostellar envelopes. In this particular study, the authors present the methodology for the second pathway using Spitzer/IRAC, 2MASS, and UKIRT imaging and photometry. Although IRE selection of YSOs is well-trodden territory, MYStIX presents unique challenges. The target complexes range from relatively nearby clouds in uncrowded fields located toward the outer Galaxy (e.g., NGC 2264, the Flame Nebula) to more distant, massive complexes situated along complicated, inner Galaxy sightlines (e.g., NGC 6357, M 17). The authors combine IR spectral energy distribution (SED) fitting with IR color cuts and spatial clustering analysis to identify IRE sources and to isolate probable YSO members in each MYStIX target field from the myriad types of contaminating sources that can resemble YSOs: extragalactic sources, evolved stars, nebular knots, and even unassociated foreground/background YSOs. Applying their methodology consistently across 18 of the target complexes, they produce the MYStIX IRE Source (MIRES) Catalog comprising 20,719 sources, including 8,686 probable stellar members of the MYStIX target complexes. They also classify the SEDs of 9,365 IR counterparts to MYStIX X-ray sources to assist the first pathway, the identification of X-ray-detected stellar members. The MYStIX project, described by Feigelson et al. (2013, ApJS, 209, 26), provides a comprehensive, parallel study of 20 Galactic massive star-forming regions. The basic input data for the MIRES Catalog were near-IR (NIR) and mid-IR (MIR) photometric catalogs. The authors also used NIR and MIR images and mosaics for visualizing the point-source populations with respect to various nebular structures. They provide high-level descriptions of each input catalog in section 2 of the reference paper. This table contains the MYStIX IRE Source (MIRES) Catalog comprising IR data on 20,719 sources, including 8,686 probable stellar members of the MYStIX target complexes, viz., massive star-forming regions (MSFRs), which was given in Table 2 of the reference paper. It does not include the IR data of the above-mentioned 9,365 IR counterparts to MYStIX X-ray sources (the SED Classification of IR Counterparts to MYStIX X-ray sources (SCIM-X Catalog) that were listed in Table 7 of the reference paper. This table was created by the HEASARC in February 2014 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/209/31">CDS Catalog J/ApJS/209/31</a> file table2.dat. This is a service provided by NASA HEASARC . 2013ApJS..209...31P https://heasarc.gsfc.nasa.gov/W3Browse/all/mystixires.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=mystixires& GET text/xml 180 99999 true 168.5203656 -61.9218709 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=mystixires GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_mystixires&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Infrared public mystixires Massive Young Star-Forming Complex Study in IR & X-Rays: IR-Exce sfr_name Designation of MYStIX Galactic Massive Star-Forming Region meta.id.assoc char nullable name Source Designation (MIRES GLLL.llll+BB.bbbb) 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 Used for SED Fitting mag phot.mag;em.IR.J double nullable jmag_error J-Band Magnitude Uncertainty mag stat.error;phot.mag;em.IR.J double nullable hmag H-Band Magnitude Used for SED Fitting mag phot.mag;em.IR.H double nullable hmag_error H-Band Magnitude Uncertainty mag stat.error;phot.mag;em.IR.H double nullable ks_mag Ks-Band Magnitude Used for SED Fitting mag phot.mag;em.IR.K double nullable ks_mag_error Ks-Band Magnitude Uncertainty mag stat.error;phot.mag;em.IR.K double nullable irac_3p6_um_mag Spitzer/IRAC 3.6um Magnitude Used for SED Fitting mag phot.mag;em.IR.3-4um double nullable irac_3p6_um_mag_error Spitzer/IRAC 3.6um Magnitude Uncertainty mag stat.error;phot.mag;em.IR.3-4um double nullable sed_class SED Classification Flag: 0=Likely YSO, 1=Starburst Galaxy, 2=AGN, 3=PAH Knot src.class short nullable yso_stage Evolutionary Stage Classification src.class short nullable irac_8p0_um_mag Spitzer/IRAC 8.0um Magnitude Used for SED Fitting mag phot.mag;em.IR.4-8um double nullable ks_mag_flag Provenance of the Ks Source Matched to IRAC Source: 0=2MASS, 1=UKIRT, -1=None meta.code;phot.mag;em.IR.K short nullable sed_chi_squared Chi-Squared of Best-Fit SED Model stat.fit.chi2;spect double nullable jmag_flag Provenance of the J Source Matched to IRAC Source: 0=2MASS, 1=UKIRT, -1=None meta.code;phot.mag;em.IR.J short nullable hmag_flag Provenance of the H Source Matched to IRAC Source: 0=2MASS, 1=UKIRT, -1=None meta.code;phot.mag;em.IR.H short nullable lii Galactic Longitude degree pos.galactic.lon double nullable num_ukirt_alt_matches Number of UKIRT Sources Providing Possible Alternative Matches to IRAC Source meta.number short nullable irac_5p8_um_mag_error Spitzer/IRAC 5.8um Magnitude Uncertainty mag stat.error;phot.mag;em.IR.4-8um double nullable irac_8p0_um_mag_error Spitzer/IRAC 8.0um Magnitude Uncertainty mag stat.error;phot.mag;em.IR.4-8um double nullable chandra_fov_flag Flag Indicates 1=Source within Chandra Field-of-View for MYStIX, 0=Otherwise meta.code short nullable ukirt_catalog_label UKIRT Catalog Label (King et al., 2013, J/ApJS/209/28) Matched to IRAC Source meta.id.cross char nullable irac_4p5_um_mag_error Spitzer/IRAC 4.5um Magnitude Uncertainty mag stat.error;phot.mag;em.IR.4-8um double nullable irac_5p8_um_mag Spitzer/IRAC 5.8um Magnitude Used for SED Fitting mag phot.mag;em.IR.4-8um double nullable vmag_extinction Visual Extinction mag phys.absorption;em.opt.V double nullable irac_4p5_um_mag Spitzer/IRAC 4.5um Magnitude Used for SED Fitting mag phot.mag;em.IR.4-8um double nullable membership_flag Flag Indicates 1=Probable Member of Target MSFR (8686 Sources), 0=Otherwise meta.code;src short nullable membership_prob_density Complex Member Probability Density stat.probability double nullable irac_4p5_um_mag_flag Limit Flag for Spitzer/IRAC 4.5um Magnitude meta.code;phot.mag;em.IR.4-8um char nullable bii Galactic Latitude degree pos.galactic.lat 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