J/MNRAS/381/341 MRCR-SUMSS Ultra-steep-spectrum (USS) sample (Broderick+, 2007) ================================================================================ A new search for distant radio galaxies in the Southern hemisphere. I. Sample definition and radio properties. Broderick J.W., Bryant J.J., Hunstead R.W., Sadler E.M., Murphy T. =2007MNRAS.381..341B ================================================================================ ADC_Keywords: Surveys ; Galaxies, radio ; Polarization Keywords: polarization - surveys galaxies: active - radio continuum: galaxies - radio continuum: general Abstract: This paper introduces a new program to find high-redshift radio galaxies in the Southern hemisphere through ultra-steep spectrum (USS) selection. We define a sample of 234 USS radio sources with spectral indices {alpha}^843^_408_<=-1.0 (S_{nu}_{prop.to}{nu}^alpha^) and flux densities S_408_>=200mJy in a region of 0.35sr, chosen by cross-correlating the revised 408MHz Molonglo Reference Catalogue, the 843MHz Sydney University Molonglo Sky Survey and the 1400MHz NRAO VLA Sky Survey in the overlap region -40{deg}) Note (6): For single-component resolved sources, this is the deconvolved major axis of the elliptical Gaussian used to fit the source. * For unresolved sources, we have used the distribution of deconvolved sizes to estimate a LAS upper limit of 2 arcsec. * For multicomponent sources, the LAS is the angular separation of the most widely separated components. Note (7): For multicomponent sources, this is the orientation of the most widely separated components used to calculate the LAS. Note (8): Radio morphology as follows: S = single component D = double T = triple HT = head-tail NAT = narrow-angle tail WAT = wide-angle tail C = complex Di = incipient doubles in which the components are not fully resolved -------------------------------------------------------------------------------- Byte-by-byte Description of file: table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- --- [NVSS] 6- 19 A14 --- NVSS NVSS designation (JHHMMSS+DDMMSS) 20- 24 A5 --- m_NVSS Multiplicity index on NVSS (HT, ND, SD or WAT) (2) 25 A1 --- f_NVSS Flag when associated data (G1) 26 A1 --- n_NVSS [ab] Note on NVSS (2) 28- 32 F5.1 mJy S1384c ? 1384MHz integrated flux density of central component (3) 34- 39 F6.1 mJy S1384 ? Total 1384MHz integrated flux density (4) 41- 45 F5.1 mJy S1384n ? 1384MHz integrated flux density of north lobe (3) 46- 48 A3 --- n_S1384n [(EW) ] Note on S1384n (4) 50- 54 F5.1 mJy S1384s ? 1384MHz integrated flux density of south lobe (3) 55- 57 A3 --- n_S1384s [(EW) ] Note on S1384s (4) 59- 63 F5.1 mJy S2368c ? 2368MHz integrated flux density of central component (3) 64- 66 A3 --- n_S2368c [(EW) ] Note on S2368c (4) 68- 72 F5.1 mJy S2368 ? Total 2368MHz integrated flux density (4) 74- 78 F5.1 mJy S2368n ? 2368MHz integrated flux density of north lobe (3) 79- 81 A3 --- n_S2368n [(EW) ] Note on S2368n (4) 83- 87 F5.1 mJy S2368s ? 2368MHz integrated flux density of south lobe (3) 88- 90 A3 --- n_S2368s [(EW) ] Note on S2368s (4) 92- 96 F5.2 --- alpha1 ? Two-point spectral index between 2368MHz and 1384MHz for central component (5) 98-102 F5.2 --- alpha2 ? Two-point spectral index between 2368MHz and 1384MHz for north lobe (5) 104-108 F5.2 --- alpha3 ? Two-point spectral index between 2368MHz and 1384MHz for south lobe (5) 110 A1 --- l_p1384c Limit flag on p1384c 111-114 F4.1 % p1384c ? 1384MHz fractional linear polarization for the central component (6) 116-118 F3.1 % e_p1384c ? rms uncertainty on p1384c 120 A1 --- l_p1384n Limit flag on p1384n 121-124 F4.1 % p1384n ? 1384MHz fractional linear polarization for the north lobe component (6) 126-128 F3.1 % e_p1384n ? rms uncertainty on p1384n 130 A1 --- l_p1384s Limit flag on p1384s 131-134 F4.1 % p1384s ? 1384MHz fractional linear polarization for the south lobe component (6) 136-138 F3.1 % e_p1384s ? rms uncertainty on p1384s 140 A1 --- l_p2368c Limit flag on p2368c 141-144 F4.1 % p2368c ? 2368MHz fractional linear polarization for the central component (6) 146-148 F3.1 % e_p2368c ? rms uncertainty on p2368c 150 A1 --- l_p2368n Limit flag on p2368n 151-154 F4.1 % p2368n ? 2368MHz fractional linear polarization for the north lobe component (6) 155-157 A3 --- n_p2368n [(E) ] (E) when data for eastern component 159-162 F4.1 % e_p2368n ? rms uncertainty on p2368n 164 A1 --- l_p2368s Limit flag on p2368s 165-168 F4.1 % p2368s ? 2368MHz fractional linear polarization for the south lobe component (6) 169-171 A3 --- n_p2368s [(W) ] (W) when data for weastern component 173-175 F3.1 % e_p2368s ? rms uncertainty on p2368s 177-180 I4 rad/m2 RMC ? Observed-frame Faraday rotation measure for the central components (7) 182 I1 rad/m2 e_RMC ? rms uncertainty on RMC 184-187 I4 rad/m2 RMN ? Observed-frame Faraday rotation measure for the north lobe components (7) 189 I1 rad/m2 e_RMN ? rms uncertainty on RMN 191-194 I4 rad/m2 RMS ? Observed-frame Faraday rotation measure for the south lobe components (7) 196 I1 rad/m2 e_RMS ? rms uncertainty on RMS 198-200 I3 rad/m2 RM ? Galactic rotation measure (8) -------------------------------------------------------------------------------- Note (2): Note as follows: a = NVSS J010619-325713 (narrow-angle tail morphology), NVSS J014353-331041 (wide-angle tail morphology) and NVSS J020827-342635 + NVSS J020828-342520 (complex morphology) are low-redshift FR I-type radio sources. See the notes on individual sources in notes.dat file. b = NVSS J015745-310557 and NVSS J215547-344614 are both resolved into two independent sources with the ATCA. * For NVSS J015745-310557: ND = northern double SD = southern double * For J215547-344614: WAT = northern wide-angle tail source, HT = southern head-tail source See the notes on individual sources in notes.dat file. Note (3): 1384MHz and 2368MHz integrated flux densities of the radio components in each ATCA image: central component (C), north lobe (N) and south lobe (S). The central component is the only entry for sources with a single-component morphology at either 1384 or 2368MHz, or, for triple sources, the core. Note (4): Often there are more components present at 2368MHz than at 1384MHz because of the increase in angular resolution. We give the combined flux density of the lobes in incipient doubles at either 1384 or 2368MHz (in S1384MHz and S2368MHz columns). For those sources where the lobes are close to east- west, we also label the eastern lobe (E) and the western lobe (W). Note (5): The two-point spectral index {alpha}^2368^_1384_ for the central component, north lobe and south lobe, assuming that each component is not blended at 1384MHz. Note (6): 1384 and 2368MHz fractional linear polarization for the central, north lobe and south lobe components, measured at the position of peak intensity. A 3{sigma} upper limit is given for source components with undetected polarization. Note (7): The observed-frame Faraday rotation measure (RM), not corrected for the Galactic Faraday screen, for the central, north lobe and south lobe components. Note (8): Galactic RM determined from the all-sky RM map of Johnston-Hollitt, Hollitt & Ekers (2004, in Uyaniker B., Reich W., Wielebinski R., eds, The Magnetized Interstellar Medium. Copernicus GmbH, Katlenburg-Lindau, p. 13) -------------------------------------------------------------------------------- Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- --- [NVSS] 6- 19 A14 --- NVSS NVSS designation (JHHMMSS+DDMMSS) 20- 39 A20 --- NVSS2 Second NVSS name when combined data 41- 42 I2 h RAh Host galaxy Right ascension (J2000) (1) 44- 45 I2 min RAm Host galaxy Right ascension (J2000) (1) 47- 51 F5.2 s RAs Host galaxy Right ascension (J2000) (1) 53 A1 --- DE- Host galaxy Declination sign (J2000) (1) 54- 55 I2 deg DEd Host galaxy Declination (J2000) (1) 57- 58 I2 arcmin DEm Host galaxy Declination (J2000) (1) 60- 63 F4.1 arcsec DEs Host galaxy Declination (J2000) (1) 65 A1 --- l_Bjmag Limit flag on Bjmag 66- 69 F4.1 mag Bjmag B_J_ magnitude 71 A1 --- l_Rmag Limit flag on Rmag 72- 75 F4.1 mag Rmag R magnitude -------------------------------------------------------------------------------- Note (1): Host galaxy coordinates are the SuperCOSMOS fitted positions in the UKR images, except for those cases where the counterpart is detected in the UKJ image only. -------------------------------------------------------------------------------- Byte-by-byte Description of file: notes.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 A4 --- --- [NVSS] 6- 19 A14 --- NVSS NVSS designation (JHHMMSS+DDMMSS) 21- 80 A60 --- Note Text of the note -------------------------------------------------------------------------------- Global notes: Note (G1): In five cases, the measurement are for two sources, as follows: A = NVSS J023601-314204 + NVSS J023605-314235 B = NVSS J023641-324615 + NVSS J023645-324543 C = NVSS J024012-305742 + NVSS J024016-305710 D = NVSS J020827-342635 + NVSS J020828-342520 E = NVSS J211107-314058 + NVSS J211108-313958 -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 29-Sep-2008