J/AJ/130/1358 Radio observations of the HDFS region. I (Norris+, 2005)
Radio observations of the Hubble Deep Field-South region. I. Survey description and initial results. Norris R.P., Huynh M.T., Jackson C.A., Boyle B.J., Ekers R.D., Mitchell D.A., Sault R.J., Wieringa M.H., Williams R.E., Hopkins A.M., Higdon J. <Astron. J., 130, 1358-1372 (2005)> =2005AJ....130.1358N
ADC_Keywords: QSOs ; Radio continuum ; Surveys ; Photometry ; Morphology Keywords: quasars: general - radio continuum: galaxies - surveys Abstract: This paper is the first of a series describing the results of the Australia Telescope Hubble Deep Field-South radio survey. The survey was conducted at four wavelengths, 20, 11, 6, and 3cm, over a 4 year period and achieves an rms sensitivity of about 10µJy at each wavelength. We describe the observations and data reduction processes and present data on radio sources close to the center of the Hubble Deep Field-South. We discuss in detail the properties of a subset of these sources. The sources include both starburst galaxies and galaxies powered by an active galactic nucleus and range in redshift from 0.1 to 2.2. Some of them are characterized by unusually high radio-to-optical luminosities, presumably caused by dust extinction. Description: We imaged the HDF-S using ATCA at four wavelengths, 20, 11, 6, and 3cm, obtaining resolutions of 6", 4", 2", and 1", respectively. Observations were taken over a period of 4 years from mid-1998 to late 2001 in a variety of configurations to maximize u-v coverage (i.e., the sampling of the Fourier plane). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 110 87 Catalogue of ATHDFS sources within 6.5' of J2000 22:32:56.22, -60:33:02.7 table4.dat 108 19 Optical and derived properties of the subset
See also: J/AJ/130/1373 : Radio observations of the HDFS region. II (Huynh+, 2005) J/ApJ/533/611 : 1.4GHz survey in HDF region (Richards+, 2000) J/MNRAS/358/1159 : Radio sources in HDF and HFF (Muxlow+, 2005) J/AJ/120/2747 : HDF-South WFPC2 observations (Casertano+, 2000) J/AJ/122/2190 : HDF-South multicolor observations (Vanzella+, 2001) J/AJ/122/2205 : HDF-South K photometric redshift catalog (Rudnick+, 2001) J/AJ/126/1208 : UVBI magnitudes and redshifts in HDF-South (Sawicki+, 2003) J/ApJ/538/493 : HDF-South NICMOS field (Yahata+, 2000) J/ApJ/548/127 : Hubble Deep Field-South region (Teplitz+ 2001) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Ref Internal source reference number 4- 9 A6 --- --- [ATHDFS] 11- 26 A16 --- ATHDFS Source name 28- 29 I2 h RAh Hour of Right Ascension (J2000) 31- 32 I2 min RAm Minute of Right Ascension (J2000) 34- 38 F5.2 s RAs Second of Right Ascension (J2000) 40- 43 F4.2 s e_RAs The 1sigma uncertainty in RAs (1) 45 A1 --- DE- Sign of the Declination (J2000) 46- 47 I2 deg DEd Degree of Declination (J2000) 49- 50 I2 arcmin DEm Arcminute of Declination (J2000) 52- 55 F4.1 arcsec DEs Arcsecond of Declination (J2000) 57- 60 F4.2 arcsec e_DEs The 1sigma uncertainty in DEs (1) 62- 66 F5.3 mJy S20cm ? The 20cm flux density (2) 68- 72 F5.3 mJy S11cm ? The 11cm flux density (2) 74- 78 F5.3 mJy S6cm ? The 6cm flux density (2) 80- 84 F5.3 mJy S3cm ? The 3cm flux density (2) 85- 89 F5.2 arcsec MajAxis Deconvolved major axis at Band 91- 94 F4.2 arcsec MinAxis Deconvolved minor axis at Band 96-100 F5.1 deg PA [-90/90] Deconvolved position angle at Band (3) 102-106 F5.1 --- S/N Local signal to noise ratio 108 A1 --- Band [LSCX] Wavelength at which the source position and Gaussian fit parameters were measured (4) 110 I1 --- Qual [1/2] Quality flag (5)
Note (1): Note that these uncertainties refer to the formal positional uncertainties derived from the fitting process. To these should be added, in quadrature, a systematic uncertainty of about 0.2", representing the uncertainty in the position of the AT phase calibrator sources. Note (2): The published tables indicates units of µJy, most likely a typo. Where the column is blank, then the source is either undetected at that wavelength, i.e. below 5σlocal,ν, or lies outside the catalogued area. The peak flux is given for unresolved sources and the integrated flux is given for resolved sources. Note (3): Measured east of north. Note (4): Wavelength at which the source position and Gaussian fit parameters were measured, with L = 20cm (1.5GHz); S = 11cm (2.7GHz); C = 6cm (5.0GHz); X = 3cm (10GHz). Note (5): The peak flux from this fit was then compared with a peak value derived from a parabolic fit to the source 1 = If these two peak values differed by less than 20% and the fitted position was inside the 0.9Speak flux density contour, then these fluxes and positions were assigned a quality flag of 1. 2 = If they failed this test but inspection showed that the derived position and peak flux density of the peak were consistent with the data, then they were assigned a quality flag of 2.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- Seq Internal source reference number 4- 9 A6 --- --- [ATHDFS] 11- 26 A16 --- ATHDFS Source name 28- 32 F5.3 mJy S20cm Flux density at 20cm (1.5GHz) 34- 39 F6.4 --- z Redshift 41 A1 --- l_Vmag [>] Upper limit flag on Vmag 42- 46 F5.2 mag Vmag V band magnitude (in the AB system) (1) 48 A1 --- l_Rmag [>] Upper limit flag on Rmag 49- 52 F4.1 mag Rmag R band magnitude (in the AB system) (1) 54 A1 --- l_Imag [>] Upper limit flag on Imag 55- 59 F5.2 mag Imag I band magnitude (in the AB system) (1) 61- 65 F5.2 mag Jmag ? J band magnitude (in the AB system) 67- 71 F5.2 mag Kmag ? K band magnitude (in the AB system) 73- 77 F5.2 [W/Hz] logLR ? Radio luminosity at 20cm 79 A1 --- l_log(R/I) [>] Upper limit flag on log(S20cm/I) 80- 84 F5.2 --- log(R/I) Logarithm of the radio-to-optical luminosity ratio (2) 86- 89 I4 solMass/yr SFR ? Star formation rate implied by the radio luminosity (3) 91-104 A14 --- Class Classification of the radio source (4) 106-108 A3 --- Note Notes (5)
Note (1): Except where otherwise stated, measured values of V, R, and I are taken from the CTIO catalog (Palunas et al. 2000ApJ...541...61P). Note (2): Logarithm of the radio-to-optical luminosity ratio, calculated as 0.4(I-S20cm), where I is the I-band magnitude and S20cm is the radio magnitude derived from the 20cm flux density using the AB radio magnitude scale defined by Ivezic et al. (2002AJ....124.2364I). Note (3): Star formation rate implied by the radio luminosity if all radio emission is assumed to be generated by star formation activity, using the scaling given by Condon (1992ARA&A..30..575C) with a Salpeter initial mass function (Q=5.5). Note (4): Classification of the radio source. SB indicates starburst activity, Sy indicates a Seyfert galaxy, and GPS indicates a gigahertz-peaked- spectrum AGN. Note (5): Notes, defined as follows: a = J and K from EIS (ESO Infrared Survey; Nonino et al. 1999A&AS..137...51N). b = J and K from Franceschini et al. (2003A&A...403..501F). c = R and I limits are based on nondetection in WFPC FF observations. d = I, J, and K from Vanzella et al. (2001AJ....122.2190V). e = For the calculation of the radio-optical ratio, I has been estimated as I=J+0.12, where 0.12 is the mean value of I-J for those sources in this subset for which a measured value of I-J is available. f = For the calculation of the radio-optical ratio, I has been estimated as I=R-0.83, where 0.83 is the mean value of R-I for those sources in this subset for which a measured value of R-I is available.
History: From electronic version of the journal References: Huynh et al., Paper II 2005AJ....130.1373H, Cat. J/AJ/130/1373
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 27-Feb-2006
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