VLAONCCAT ivo://nasa.heasarc/vlaonccat NASA/GSFC HEASARC Forbrich et al. 2026-07-17 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains a deep centimeter-wavelength catalog of the Orion Nebula Cluster (ONC), based on a 30-hr single-pointing observation with the Karl G. Jansky Very Large Array (JVLA) in its high-resolution A configuration using two 1-GHz bands centered on 4.7 and 7.3 GHz. A total of 556 compact sources were detected in a map with a nominal rms noise of 3 µJy/beam, limited by complex source structure and the primary beam response. Compared to previous catalogs, these detections increase the sample of known compact radio sources in the ONC by more than a factor of seven. The new data show complex emission on a wide range of spatial scales. Following a preliminary correction for the wideband primary-beam response, the authors determine radio spectral indices for 170 sources whose index uncertainties are less than +/-0.5. They compare the radio to the X-ray and near-infrared point-source populations, noting similarities and differences. The observations were carried out with the JVLA of the National Radio Astronomy Observatory on 2012 September 30 and October 2-5 under the auspices of the project code SD630. Data were taken using the VLA's C-band (4-8 GHz) receivers in full polarization mode, with two 1-GHz basebands centered at 4.736 and 7.336 GHz to provide a good baseline for source spectral index determination. Apart from the first epoch, the field was simultaneously observed with the Chandra X-Ray Observatory. Mostly of interest for variability information, these data will be presented as part of a follow-up paper. This table was created by the HEASARC in September 2016 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJ/822/93">CDS Catalog J/ApJ/822/93</a> file table1.dat (the compact source catalog). Some of the values for the name parameter in the HEASARC's implementation of this table were corrected in April 2018. This is a service provided by NASA HEASARC . 2016ApJ...822...93F https://heasarc.gsfc.nasa.gov/W3Browse/all/vlaonccat.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=vlaonccat& GET text/xml 180 99999 true 83.85916271 -5.46012783 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=vlaonccat GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_vlaonccat&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0166666666666667 Radio public vlaonccat VLA Orion Nebula Cluster Compact Source Catalog source_number Sequential Identification Number for Each Source in the Catalog meta.id;src short nullable name Catalog-Based Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable ra_error Positional Uncertainty in Right Ascension s stat.error;pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable dec_error Positional Uncertainty in Declination arcsec stat.error;pos.eq.dec;meta.main double nullable flux_6p1_ghz Peak Flux Density, Corrected for Primary Beam Attenuation mJy phot.flux.density;em.radio.6-12GHz double nullable flux_6p1_ghz_error Uncertainty in Peak Flux Density mJy stat.error;phot.flux.density;em.radio.6-12GHz double nullable coup_source_number COUP Source Number, within 0.5 arcsecs (Getman+ 2005, J/ApJS/160/319) meta.id.cross short nullable vision_nir_id VISION Near-Infrared Source Identification, within 0.5 arcsecs meta.id.cross char nullable log_lx Logarithm of the Total, Absorption-Corrected X-Ray (0.5-8.0keV) Luminosity log(erg/s) phys.luminosity;em.X-ray double nullable source_flags Previous Radio Identification, within 0.5 arcsecs char nullable spectral_index Radio Spectral Index (Alpha), If Associated Error within 0.5 spect.index;em.radio double nullable off_axis Distance from phase Center arcmin instr.offset double nullable spectral_index_error Uncertainty in Radio Spectral Index (Alpha) stat.error;spect.index;em.radio double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon 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