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J/PASP/113/10       Sub-mJy radio sources complete sample        (Masci+, 2001)

A new complete sample of submilliJansky radio sources: an optical and near-infrared study. Masci F.J., Condon J.J., Barlow T.A., Lonsdale C.J., Xu C., Shupe D.L., Pevunova O., Fang F., Cutri R. <Publ. Astron. Soc. Pac. 113, 10 (2001)> =2001PASP..113...10M
ADC_Keywords: Radio sources ; Photometry, infrared Abstract: The Very Large Array has been used in C configuration to map an area ~=0.3deg2 at 1.4GHz with 5σ sensitivities of 0.305, 0.325, 0.380, and 0.450mJy/beam over four equal subareas. Radio properties are presented for 62 detected sources. Deep optical imaging to Gunn r ~=25mag using the Hale 5m telescope covering ~=0.21deg2 is reported for a subset of 43 sources. This optical follow-up is much deeper than that of existing larger area radio surveys of similar radio sensitivity. Archival J-, H-, and K-band photometry from the Two-Micron All Sky Survey is also presented. Using a robust likelihood ratio technique, we optically identified 26 radio sources with probability ≳80%, nine with uncertain/ambiguous detections, and eight with empty fields. Comparisons with a stellar synthesis model that includes radio emission and dust reddening suggest that the near-infrared-optical emission in a small, bright subsample is reddened by "optically thin" dust with absorption AV~=22.5mag, regardless of morphological type. This is consistent with other, more direct determinations of absorption. The radio-optical(-near-infrared) flux ratios of early-type galaxies require significant contamination in the radio by an active galactic nucleus, consistent with the current paradigm. Using our simple modeling approach, we also discuss a potential diagnostic for selecting ultraluminous infrared galaxies to z~=1.6 from microJansky radio surveys. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 113 62 Catalog of radio source data table3.dat 131 43 Complete sample of sub-mJy radio sources
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 16 A16 --- [MCB2001] Source name (RAD JHHMMSS+DDMM) 17- 18 A2 --- m_[MCB2001] [C1 C2] Multiplicity index on [MCB2001] 20- 21 I2 h RAh Right ascension (J2000.0) 23- 24 I2 min RAm Right ascension (J2000.0) 26- 31 F6.3 s RAs Right ascension (J2000.0) 33 A1 --- DE- Declination sign (J2000.0) 34- 35 I2 deg DEd Declination (J2000.0) 37- 38 I2 arcmin DEm Declination (J2000.0) 40- 44 F5.2 arcsec DEs Declination (J2000.0) 46- 49 F4.2 arcsec e_RAs rms uncertainty on right ascension 51- 54 F4.2 arcsec e_DEs rms uncertainty on declination 56- 61 F6.3 mJy Sp Peak flux density at 1.4GHz 63- 67 F5.3 mJy e_Sp rms uncertainty on Sp 69- 74 F6.3 mJy ST Total flux density at 1.4GHz 76- 80 F5.3 mJy e_ST rms uncertainty on ST 82- 87 F6.3 arcsec ThetaM FWHM of the major axis (from Gaussian fits) 89- 94 F6.3 arcsec Thetam FWHM of the minor axis (from Gaussian fits) 96- 98 I3 deg PA Position angle 100-104 F5.3 arcsec e_ThetaM rms uncertainty on ThetaM 106-110 F5.3 arcsec e_Thetam rms uncertainty on Thetam 112-113 I2 deg e_PA rms uncertainty on PA
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 16 A16 --- [MCB2001] Source name (RAD JHHMMSS+DDMM) 17- 18 A2 --- m_[MCB2001] [C1 C2] Multiplicity index on [MCB2001] 19 A1 --- n_[MCB2001] [d] Note on [MCB2001] (1) 21- 22 I2 h RAh ? Optical right ascension (J2000.0) 24- 25 I2 min RAm ? Optical right ascension (J2000.0) 27- 32 F6.3 s RAs ? Optical right ascension (J2000.0) 34 A1 --- DE- Optical declination sign (J2000.0) 35- 36 I2 deg DEd ? Optical declination (J2000.0) 38- 39 I2 arcmin DEm ? Optical declination (J2000.0) 41- 45 F5.2 arcsec DEs ? Optical declination (J2000.0) 47- 50 F4.2 arcsec DRO ? optical-radio position separation 52- 57 F6.3 --- log(LR) ? logarithm of the likelihood ratio 59- 60 A2 --- l_Rid [∼ <] Limit flag on Rid (2) 61- 65 F5.3 --- Rid ? Reliability of the optical identification (2) 67 A1 --- l_rmag Limit flag on rmag 68- 73 F6.3 --- rmag ? Apparent r-band magnitude 74 A1 --- u_rmag [?] Uncertainty flag on rmag 75 A1 --- l_Jmag Limit flag on J(sigmaJ) (3) 76- 81 F6.3 --- Jmag ? J magnitude 83- 87 F5.3 --- e_Jmag ? rms uncertainty on Jmag 89- 94 F6.3 --- Hmag ? H magnitude 96-100 F5.3 --- e_Hmag ? rms uncertainty on Hmag 102 A1 --- l_KSmag Limit flag on KSmag (3) 103-108 F6.3 --- KSmag ? KS magnitude 110-114 F5.3 --- e_KSmag ? rms uncertainty on KSmag 116-120 F5.3 mag r-H ? r-H colour index 122 A1 --- l_r-K Limit flag on r-K (3) 123-127 F5.3 mag r-K ? r-K colour index 129-131 A3 --- MType Morphology (4)
Note (1): Optical identification is uncertain because of either extended radio emission and large offset from radio centroid position or "moderately low" LR value. Note (2): Reliability of the optical identification. Cases with "very low" and "very large" log(LR) are listed with Rid≪1 and Rid∼1, respectively. Note (3): Values with ">" are 2σ upper limits on measured fluxes Note (4): Optical morphology: E, elliptical Irr, irregular or disturbed S, spiral ?, unknown
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 05-Jun-2001
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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