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J/A+A/463/97        Optical observations of GPS radio sources   (Labiano+, 2007)

GPS radio sources: new optical observations and an updated master list. Labiano A., Barthel P.D., O'dea C.P., De Vries W.H., Perez I., Baum S.A. <Astron. Astrophys., 463, 97-104 (2007)> =2007A&A...463...97L
ADC_Keywords: QSOs ; Galaxies, radio ; Radio sources ; Photometry ; Redshifts Keywords: galaxies: active - galaxies: distances and redshifts - galaxies: quasars: emission lines - galaxies: general Abstract: We identify optical counterparts, address uncertain identifications and measure previously unknown redshifts of the host galaxies of candidate Gigahertz Peaked Spectrum (GPS) radio sources, and study their stellar populations. Long slit spectroscopy and deep optical imaging in the B, V and R bands, were obtained with the Very Large Telescope. Description: The sample was observed during two nights (January 30 to 31, 2000, and December 16 to 17, 2001) using VLT's FORS1/UT1 and FORS2/UT4. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 79 15 Positions of the optical counterparts table4.dat 82 172 Master list of GHz-peaked sources refs.dat 83 36 References
See also: J/A+AS/135/273 : 408MHz obs. of GPS sources from JVAS survey (Marecki+ 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name Source name (BHHMM-DDd) 10 A1 --- n_Name [*] Individual note on Name (1) 11- 12 I2 h RAh Radio right ascension (J2000) (2) 14- 15 I2 min RAm Radio right ascension (J2000) (2) 17- 21 F5.2 s RAs Radio right ascension (J2000) (2) 23 A1 --- DE- Radio declination sign (J2000) (2) 24- 25 I2 deg DEd Radio declination sign (J2000) (2) 27- 28 I2 arcmin DEm Radio declination sign (J2000) (2) 30- 33 F4.1 arcsec DEs Radio declination sign (J2000) (2) 35- 36 I2 h RAo.h Optical right ascension (J2000) (3) 38- 39 I2 min RAo.m Optical right ascension (J2000) 41- 45 F5.2 s RAo.s Optical right ascension (J2000) 47 A1 --- DEo.- Optical declination sign (J2000) 48- 49 I2 deg DEo.d Optical declination sign (J2000) (3) 51- 52 I2 arcmin DEo.m Optical declination sign (J2000) 54- 57 F4.1 arcsec DEo.s Optical declination sign (J2000) 59- 62 F4.1 --- R1 Likelihood ratio 64 A1 --- Filter [BVR] Filter (Johnson-Cousins) 66- 69 F4.1 mag mag Magnitude in Filter (corrected for Galactic extinction) 71- 74 F4.2 mag e_mag Photon noise error (first error) (4) 76- 79 F4.2 mag e_mag2 Calibration error (second error) (4)
Note (1): Individual notes: B0914+114 : The optical coordinates correspond to the galaxy previously - and incorrectly - identified as the counterpart (see notes on individual source). B0316+161 : magnitudes may be affected by close-by (∼3") objects. Note (2): The radio positions are from the VLA calibrator manual (B0008-421, B0316+161, B0742+103) and NED (B0407-658, B0554-026, B0904+039, B0914+114). Note (3): The typical uncertainties in the radio positions are 0.01" in Declination and 0.001s in Right Ascension. Note (4): The errors in the magnitudes are divided in the two components photon noise (first error) and calibration error (second error).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 13 A13 --- Jname Name (JHHMMSS+DDMMSS, from J2000 position) 15- 23 A9 --- Name B1950 or catalogue name 25- 28 A4 --- Class Classification according to intrinsic peak frequency (1) 30- 31 A2 --- OptID [G? Q] Optical identification, Galaxy or QSO 33 A1 --- l_z Limit flag on z 34- 40 F7.5 --- z ? Redshift 41 A1 --- u_z [?] Uncertainty flag on z 42 A1 --- n_z [p] p for photometric redshift 44- 49 A6 --- r_z Reference where the source is listed as a GPS, and references for optical ID and redshift 51 A1 --- l_FPeak [~>] Limit flag on FPeak 52- 56 F5.2 GHz FPeak ? Observed frequency of the spectral peak (2) 57 A1 --- u_FPeak [?] ?: confirmation of the radio spectral shape seems necessary 59- 60 A2 --- r_FPeak Reference for FPeak 62 A1 --- l_FInt [~>] Limit flag on Fint 63- 66 F4.1 GHz FInt ? Intrinsic frequency of the spectral peak 67 A1 --- u_FInt [?] Uncertainty flag on FInt 69- 74 F6.3 Jy Flux ? Flux density, measured at Freq 76- 79 F4.2 GHz Freq ? Frequency at which flux density was measured 81- 82 I2 --- r_Flux ? Flux density reference
Note (1): Classification as follows: GPS = Gigahertz Peaked Spectrum HFP = High Frequency Peaker Note (2): Data from NED were used to estimate the spectral peak for those sources with no published measurements of the peak frequency.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Ref Reference code 4- 22 A19 --- BibCode BibCode 24- 49 A26 --- Aut Author's name 51- 83 A33 --- Com Comments
History: * 08-Mar-2007: From electronic version of the journal * 15-Mar-2007: in table4, row#110, Name corrected from 144516+095836 to 144719-340916 (mail exchange with the author)
(End) Patricia Vannier, Francois Ochsenbein [CDS] 08-Mar-2007
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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