IR20126CXO ivo://nasa.heasarc/ir20126cxo NASA/GSFC HEASARC Montes et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains results from Chandra ACIS-I and Karl G. Jansky Very Large Array 6-cm continuum observations of the IRAS 20126+4104 massive star-forming region. The authors detect 150 X-ray sources within the 17' x 17' ACIS-I field, and a total of 13 radio sources within the 9.2' primary JVLA beam at 4.9 GHz. Among these observations are the first 6-cm detections of the central sources reported by Hofner et al. (2007, A&A, 465, 197), namely, I20N1, I20S, and I20var. A new variable radio source is also reported in Section 3.2 of the reference paper, [MHA2015] VLA G78.1907+3.364. Searching the 2MASS archive, the authors identified 88 near-infrared (NIR) counterparts to the X-ray sources. Only four of the X-ray sources had 6-cm counterparts. Based on an NIR color-color analysis and on the Besancon simulation of Galactic stellar populations, the authors estimate that approximately 80 X-ray sources are associated with this massive star-forming region. They detect an increasing surface density of X-ray sources toward the massive protostar IRAS 20126+4104 and infer the presence of a cluster of at least 43 young stellar objects within a distance of 1.2 pc from this protostar. The authors observed the IRAS 20126+4104 region with the Chandra ACIS-I instrument on 2003 March 17 for a total exposure time of 39.35 ks. C-band (6 cm) continuum observations of the massive star-forming region IRAS 20126+4104 were conducted with the VLA operated by NRAO on 2011 August 7. These X-ray and radio data are augmented by NIR and optical archival data. For the Mid-IR wavelength regions, the authors searched the Spitzer Enhanced Imaging Products Point Source catalog. This table was created by the HEASARC in March 2016 based on the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/219/41">CDS catalog J/ApJS/219/41</a> files table1.dat and table5.dat. This is a service provided by NASA HEASARC . 2015ApJS..219...41M https://heasarc.gsfc.nasa.gov/W3Browse/all/ir20126cxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ir20126cxo& GET text/xml 180 99999 true 303.69124167 41.06803611 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ir20126cxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ir20126cxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 X-ray public ir20126cxo IRAS 20126+4104 Chandra X-Ray Point Source Catalog source_number Sequential Identification Number for Each Source in the Catalog meta.id;src short nullable name 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 count_rate Observed Count Rate ct/s phot.count;em.X-ray double nullable flux Observed X-Ray Flux erg/s/cm^2 phot.flux;em.X-ray double nullable hardness_ratio Hardness Ratio phot.flux;arith.ratio;em.X-ray double nullable twomass_name 2MASS Source Designation (2MASS JHHMMSSss+DDMMSSs) meta.id.cross char nullable jmag 2MASS J-Band Magnitude mag phot.mag;em.IR.J double nullable spitzer_name SSTSLP Source Designation (SSTU JHHMMSS.ss+DDMMSS.s) meta.id.cross;em.IR char nullable hmag 2MASS H-Band Magnitude mag phot.mag;em.IR.H double nullable lii Galactic Longitude degree pos.galactic.lon double nullable twomass_flag Flag [a-ce-g] Indicates 2MASS Source Note meta.code;src char nullable bii Galactic Latitude degree pos.galactic.lat double nullable usnob1_name USNO-B1 Source Designation meta.id.cross;em.opt char nullable vla_name VLA Source Designation ([MHA2015] VLA GLL.llll+B.bbbb) meta.id.cross;em.radio char nullable var_flag Flag [V/FL] Indicates Variability Classification: V=Variable; FL=flaring; meta.code;src.var char nullable ks_mag 2MASS Ks-Band Magnitude mag phot.mag;em.IR.K double nullable original_name Source Designation As Originally Specified in the Catalog meta.id char nullable spitzer_flag Flag [d] Indicates Spitzer Source Note meta.code;em.IR 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