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J/PASP/113/10 Sub-mJy radio sources complete sample (Masci+, 2001)
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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
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ADC_Keywords: Radio sources ; Photometry, infrared
Abstract:
The Very Large Array has been used in C configuration to map an area
~=0.3deg^2^ at 1.4GHz with 5{sigma} 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 ~=0.21deg^2^ 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 A_V_~=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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 113 62 Catalog of radio source data
table3.dat 131 43 Complete sample of sub-mJy radio sources
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 ? K_S_ 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)
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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 R_id_~1, respectively.
Note (3): Values with ">" are 2{sigma} upper limits on measured fluxes
Note (4): Optical morphology:
E, elliptical
Irr, irregular or disturbed
S, spiral
?, unknown
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History:
From electronic version of the journal
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(End) James Marcout, Patricia Bauer [CDS] 05-Jun-2001