J/A+A/489/49 Observations of candidate GPS sources (Vollmer+, 2008) ================================================================================ Quasi-simultaneous multi-frequency observations of inverted-spectrum radio sources from the multi-epoch SPECFIND catalog. Vollmer B., Krichbaum T.P., Angelakis E., Kovalev Y.Y. =2008A&A...489...49V ================================================================================ ADC_Keywords: Radio sources ; Galaxies, radio Keywords: radio continuum: galaxies - galaxies active Abstract: Gigahertz-Peaked Spectrum (GPS) sources are likely the precursors of local radio galaxies. Existing GPS source samples are small (<200). We aim to extend the available sample of the Gigahertz-Peaked Spectrum (GPS) and High Frequency Peaker (HFP) sources in order to study their nature with greater detail and higher statistical significance. Description: A sample of 214 radio sources, which were extracted from the SPECFIND catalog (Cat. VIII/74) and show an inverted radio spectrum, were observed quasi-simultaneously at 4.85, 10.45, and 32GHz with the 100-m Effelsberg radio telescope. Using the VLBA calibrator survey (VCS) we have investigated the parsec-scale morphology of the sources. Table 5: results of the observations. Table 6: properties of the sources. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table5.dat 92 214 Results of the observations table6.dat 70 214 Properties of the sources -------------------------------------------------------------------------------- See also: VIII/74 : SPECFIND Catalog of radio continuum spectra (Vollmer+ 2005) Byte-by-byte Description of file: table5.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Source name (JHHMM+DDMM) 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 22 F5.2 s RAs Right ascension (J2000) 24 A1 --- DE- Declination sign (J2000) 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 34 F4.1 arcsec DEs Declination (J2000) 36- 40 I5 mJy S4.85 Flux density at 4.85GHz 42- 44 I3 mJy e_S4.85 Error on S4.85GHz 46- 49 I4 mJy S10.45 ?=- Flux density at 10.45GHz 51- 53 I3 mJy e_S10.45 ? Error on S10.45GHz 55- 58 I4 mJy S32 ?=- Flux density at 32.00GHz 60- 62 I3 mJy e_S32 ? Error on S32GHz 64- 68 F5.2 --- SI1 ? Spectral index between 4.85 and 10.45GHz 70- 73 F4.2 --- e_SI1 ? Error on SI1 75- 79 F5.2 --- SI2 ? Spectral index between 10.45 and 32.00GHz 81- 84 F4.2 --- e_SI2 ? Error on SI2 86- 92 A7 --- Res Frequencies at which the source is resolved -------------------------------------------------------------------------------- Byte-by-byte Description of file: table6.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- Name Source name (JHHMM+DDMM) 12 A1 --- l_z Limit flag on z 13- 17 F5.3 --- z ? Redshift (1) 19 A1 --- VCS [y/n] VLBA calibrator survey source 21- 23 A3 --- Type Object type from SIMBAD 25- 27 A3 --- Rtype Radio type (GPS or HFP) (2) 29- 31 A3 --- Sample Sample membership (3) 33- 34 A2 --- Var [VE ] Variable or Extended (at 4.85GHz) source 36- 40 I5 MHz nup ? Peak frequency 42- 45 I4 mJy Sp ? Peak flux density 47- 51 A5 --- Note [low b] source at galactic latitude |b|<10{deg} 53 A1 --- l_c8.6 Limit flag on c8.6GHz 54- 57 F4.2 --- c8.6 ? VLBI compactness ratio at 8.6 GHz 59 A1 --- l_c2.3 Limit flag on c2.3GHz 60- 63 F4.2 --- c2.3 ? VLBI compactness ratio at 2.3 GHz 65- 70 A6 --- Class VLBI morphological class (6) -------------------------------------------------------------------------------- Note (1): Redshift from Veron-Cetty & Veron (2006, Cat. VII/248) Note (2): Gigahertz-Peaked Spectrum (GPS) or High Frequency Peaker (HFP). The classification criteria are described in Sect. 6 of the paper. Note (3): Sample as follows: B = Snellen et al. (1998A&AS..131..435S) S = Stanghellini et al. (1998, Cat. J/A+AS/131/303) F = Fanti et al. (2001, Cat. J/A+A/369/380) D = Dallacasa et al. (2000, Cat. J/A+A/363/887) M = Marecki et al. (1999, Cat. J/A+AS/135/273) L = Labiano et al. (2007, Cat. J/A+A/463/97) Note (6): Classification based on VLBI images as follows: nc = naked core candidate cj = core-jet candidate cso = compact symmmetric object candidate cj/cso = core-jet or compact symmetric object candidate, components cross-identification between 2 and 8GHz is questionable The VCS classification for the following sources was corrected according to deeper multi-frequency VLBI studies: J0003+2129 (Orienti et al., 2006, Cat. J/A+A/450/959), J1407+2827 (e.g., Stanghellini et al., 1997A&A...318..376S), J1551+5806 (Snellen et al., 2000MNRAS.319..429S); our cso candidates J0111+3906, J0713+4349, J1823+7938, J2022+6136 are confirmed by Peck & Taylor (2000ApJ...534...90P). -------------------------------------------------------------------------------- Acknowledgements: Bernd Vollmer, vollmer(at)astro.u-strasbg.fr References: Vollmer et al., 2005A&A...436..757V ================================================================================ (End) Patricia Vannier [CDS] 18-Sep-2008