J/MNRAS/465/4085 PACO radio sources complete sample polarimetry (Galluzzi+ 2017)
Multifrequency polarimetry of a complete sample of PACO radio sources.
Galluzzi V., Massardi M., Bonaldi A., Casasola V., Gregorini L.,
Trombetti T., Burigana C., De Zotti G., Ricci R., Stevens J., Ekers R.D.,
Bonavera L., Di Serego Alighieri S., Liuzzo E., Lopez-caniego M.,
Mignano A., Paladino R., Toffolatti L., Tucci M.
<Mon. Not. R. Astron. Soc., 465, 4085-4098 (2017)>
=2017MNRAS.465.4085G 2017MNRAS.465.4085G (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Polarization
Keywords: galaxies: active - galaxies: statistics - radio continuum: galaxies
Abstract:
We present high-sensitivity polarimetric observations
(σP~=0.6mJy) in six bands covering the 5.5-38GHz range of a
complete sample of 53 compact extragalactic radio sources brighter
than 200mJy at 20GHz. The observations, carried out with the
Australia Telescope Compact Array, achieved a 91 per cent detection
rate (at 5σ). Within this frequency range, the spectra of about
95 per cent of sources are well fitted by double power laws, both in
total intensity and in polarization, but the spectral shapes are
generally different in the two cases. Most sources were classified as
either steep- or peaked-spectrum but less than 50 per cent have the
same classification in total and in polarized intensity. No
significant trends of the polarization degree with flux density or
with frequency were found. The mean variability index in total
intensity of steep-spectrum sources increases with frequency for a
4-5yr lag, while no significant trend shows up for the other sources
and for the 8yr lag. In polarization, the variability index, which
could be computed only for the 8yr lag, is substantially higher than
in total intensity and has no significant frequency dependence.
Description:
The PACO project yielded observations of 464 AT20G sources in 65
epochs between 2009 July and 2010 August in the 5.5-39GHz frequency
range with ATCA, nearly simultaneously (within 10d) with the Planck
observations (Massardi et al., 2016, Int. J. Mod. Phys. D, 25,
1640009). The main goal of the project was to characterize, in
combination with Planck data, the total intensity spectra and their
variability over a wide frequency range (at least from 5 to 217GHz,
but up to 857GHz for some sources).
A multifrequency observing run was dedicated to polarimetry in 2014
September with ATCA. The sample was extracted from the 'faint' PACO
sample (S20GHz>200mJy) selecting sources in the Southern Ecliptic
Pole region (ecliptic latitude ←75°), where the satellite
scanning strategy implies a better sensitivity.
We present high-sensitivity (σP~=0.6mJy) polarimetric
observations of a complete sample of 53 compact extragalactic radio
sources drawn from the 'faint' PACO sample. Thanks to the high
sensitivity, we achieved a high (∼91 per cent) 5σ detection
rate in polarization.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 433 53 Full catalogue of I and P flux density,
polarisation fractions, angles, and fit
parameters
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See also:
J/MNRAS/415/1597 : PACO catalogue of bright sources (Massardi+, 2011)
J/MNRAS/416/559 : PACO faint sources catalog (Bonavera+, 2011)
J/MNRAS/428/1845 : PACO spectrally selected sample (Bonaldi+, 2013)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [0/52] Sequential number
4- 8 A5 --- --- [AT20G]
9- 22 A14 --- AT20G AT20G name (JHHMMSS-DDMMSS)
24- 32 F9.7 h RAhour Rigth ascension in decimal hours (J2000)
34- 44 F11.7 deg DEdeg Declination in decimal degrees (J2000)
46 A1 --- Flag [a] a for extended sources in the PACO catalog
48- 53 F6.1 mJy S5500 I flux density at 5500MHz
55- 60 F6.1 mJy S9000 I flux density at 9000MHz
62- 67 F6.1 mJy S18000 I flux density at 18000MHz
69- 74 F6.1 mJy S24000 I flux density at 24000MHz
76- 81 F6.1 mJy S33000 I flux density at 33000MHz
82 A1 --- n_S33000 [* ] * indicates a value extracted from the
integrated flux density in the image
84- 89 F6.1 mJy S38000 I flux density at 38000MHz
90 A1 --- n_S38000 [* ] * indicates a value extracted from the
integrated flux density in the image
91- 95 F5.1 mJy e_S5500 Errror on I flux density at 5500MHz
97-101 F5.1 mJy e_S9000 Errror on I flux density at 9000MHz
103-106 F4.1 mJy e_S18000 Errror on I flux density at 18000MHz
108-111 F4.1 mJy e_S24000 Errror on I flux density at 24000MHz
113-116 F4.1 mJy e_S33000 Errror on I flux density at 33000MHz
117 A1 --- neS33000 [* ] * indicates a value extracted from the
integrated flux density in the image
119-122 F4.1 mJy e_S38000 Errror on I flux density at 38000MHz
123 A1 --- neS38000 [* ] * indicates a value extracted from the
integrated flux density in the image
124 A1 --- l_P5500 Limit flag on P5500
125-130 F6.2 mJy P5500 ?=- P flux density at 5500MHz
131 A1 --- l_P9000 Limit flag on P9000
132-137 F6.2 mJy P9000 ?=- P flux density at 9000MHz
138 A1 --- l_P18000 Limit flag on P18000
139-144 F6.2 mJy P18000 P flux density at 18000MHz
145-146 A2 --- n_P18000 [* ] ** indicates a value extracted from the
integrated flux density in the image
147 A1 --- l_P24000 Limit flag on P24000
148-153 F6.2 mJy P24000 ?=- P flux density at 24000MHz
154-155 A2 --- n_P24000 [* ] ** indicates a value extracted from the
integrated flux density in the image
156 A1 --- l_P33000 Limit flag on P33000
157-161 F5.2 mJy P33000 ?=- P flux density at 33000MHz
162-163 A2 --- n_P33000 [* ] ** indicates a value extracted from the
integrated flux density in the image
165 A1 --- l_P38000 Limit flag on P38000
166-170 F5.2 mJy P38000 ?=- P flux density at 38000MHz
171-172 A2 --- n_P38000 [* ] ** indicates a value extracted from the
integrated flux density in the image
173-177 F5.2 mJy e_P5500 ?=- Error on P flux density at 5500MHz
179-183 F5.2 mJy e_P9000 ?=- Error on P flux density at 9000MHz
185-189 F5.2 mJy e_P18000 Error on P flux density at 18000MHz
190-191 A2 --- neP18000 [* ] ** indicates a value extracted from the
peak of the image
192-196 F5.2 mJy e_P24000 ?=- Error on P flux density at 24000MHz
197-198 A2 --- neP24000 [* ] ** indicates a value extracted from the
peak of the image
199-203 F5.2 mJy e_P33000 ?=- Error on P flux density at 33000MHz
204-205 A2 --- neP33000 [* ] ** indicates a value extracted from the
peak of the image
206-210 F5.2 mJy e_P38000 ?=- Error on P flux density at 38000MHz
211-212 A2 --- neP38000 [* ] ** indicates a value extracted from the
peak of the image
213 A1 --- l_m5500 Limit flag on m5500
214-217 F4.2 % m5500 ?=- Polarisation fraction at 5500MHz
218 A1 --- l_m9000 Limit flag on m9000
219-222 F4.2 % m9000 ?=- Polarisation fraction at 9000MHz
223 A1 --- l_m18000 Limit flag on m18000
224-227 F4.2 % m18000 Polarisation fraction at 18000MHz
228 A1 --- l_m24000 Limit flag on m24000
229-232 F4.2 % m24000 ?=- Polarisation fraction at 24000MHz
233 A1 --- l_m33000 Limit flag on m33000
234-237 F4.2 % m33000 ?=- Polarisation fraction at 33000MHz
238 A1 --- l_m38000 Limit flag on m38000
239-242 F4.2 % m38000 ?=- Polarisation fraction at 38000MHz
244-247 F4.2 % e_m5500 ?=- Error on polarisation fraction at 5500MHz
249-252 F4.2 % e_m9000 ?=- Error on polarisation fraction at 9000MHz
254-257 F4.2 % e_m18000 Error on polarisation fraction at 18000MHz
259-262 F4.2 % e_m24000 ?=- Error on polarisation fraction at 24000MHz
264-267 F4.2 % e_m33000 ?=- Error on polarisation fraction at 33000MHz
271-274 F4.2 % e_m38000 ?=- Error on polarisation fraction at 38000MHz
276-280 F5.1 deg PA5500 []?=- Polarisation angle at 5500MHz
282-286 F5.1 deg PA9000 []?=- Polarisation angle at 9000MHz
288-292 F5.1 deg PA18000 []?=- Polarisation angle at 18000MHz
294-298 F5.1 deg PA24000 []?=- Polarisation angle at 24000MHz
300-305 F6.1 deg PA33000 []?=- Polarisation angle at 33000MHz
307-312 F6.1 deg PA38000 []?=- Polarisation angle at 38000MHz
314-316 F3.1 deg e_PA5500 ?=- Error on polarisation angle at 5500MHz
318-320 F3.1 deg e_PA9000 ?=- Error on polarisation angle at 9000MHz
322-324 F3.1 deg e_PA18000 ?=- Error on polarisation angle at 18000MHz
326-328 F3.1 deg e_PA24000 ?=- Error on polarisation angle at 24000MHz
330-332 F3.1 deg e_PA33000 ?=- Error on polarisation angle at 33000MHz
334-336 F3.1 deg e_PA38000 ?=- Error on polarisation angle at 38000MHz
338-343 F6.3 --- a Best fit parameter a for I flux density
345-350 F6.3 --- b Best fit parameter b for I flux density
352-357 F6.3 --- c ?=- Best fit parameter c for I flux density
359-365 F7.3 --- v0 Best fit parameter v0 for I flux density
367-373 F7.3 --- v1 ?=- Best fit parameter v1 for I flux density
375-380 F6.3 --- S0 Best fit parameter S0 for I flux density
382-386 F5.3 --- S1 ?=- Best fit parameter S1 for I flux density
387-392 F6.3 --- chi2 Best fit parameter chi2 for I flux density
394-399 F6.3 --- aP ?=- Best fit parameter a for P flux density
401-407 F7.3 --- bP ?=- Best fit parameter b for P flux density
409 A1 --- cP ?=- Best fit parameter c for P flux density
411-416 F6.3 --- v0P ?=- Best fit parameter v0 for P flux density
418 A1 --- v1P ?=- Best fit parameter v1 for P flux density
420-425 F6.4 --- S0P ?=- Best fit parameter S0 for P flux density
427 A1 --- S1P ?=- Best fit parameter S1 for P flux density
429-433 F5.3 --- chi2P ?=- Best fit parameter chi2 for I flux
density
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History:
12-Sep-2019: From electronic version of the journal
27-Mar-2020: units corrected for RAhours (hours instead of deg)
(End) Patricia Vannier [CDS] 23-Aug-2019