J/MNRAS/501/3715 RoboPol: AGN polarimetric monitoring data (Blinov+, 2021)
RoboPol: AGN polarimetric monitoring data.
Blinov D., Kiehlmann S., Pavlidou V., Panopoulou G.V., Skalidis R.,
Angelakis E., Casadio C., Einoder E.N., Hovatta T., Kokolakis K.,
Kougentakis A., Kus A., Kylafis N., Kyritsis E., Lalakos A., Liodakis I.,
Maharana S., Makrydopoulou E., Mandarakas N., Maragkakis G.M., Myserlis I.,
Papadakis I., Paterakis G., Pearson T.J., Ramaprakash A.N.,
Readhead A.C.S., Reig P., Slowikowska A., Tassis K., Xexakis K., Zejmo M.,
Zensus J.A.
<Mon. Not. R. Astron. Soc., 501, 3715-3726 (2021)>
=2021MNRAS.501.3715B 2021MNRAS.501.3715B (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Polarization ; Redshifts ; Optical
Keywords: polarization - galaxies: active - galaxies: jets - galaxies: nuclei
Abstract:
We present uniformly reprocessed and re-calibrated data from the
RoboPol programme of optopolarimetric monitoring of active galactic
nuclei (AGNs), covering observations between 2013, when the instrument
was commissioned, and 2017. In total, the data set presented in this
paper includes 5068 observations of 222 AGN with Dec.>-25°. We
describe the current version of the RoboPol pipeline that was used to
process and calibrate the entire data set, and we make the data
publicly available for use by the astronomical community. Average
quantities summarizing optopolarimetric behaviour (average degree of
polarization, polarization variability index) are also provided for
each source we have observed and for the time interval we have
followed it.
Description:
We provide data for sources belonging to several observing samples as
indicated by the 'SID' flag in Table A1.
During, and immediately after, the RoboPol polarimeter commissioning,
we performed a month-long single-epoch survey of two unbiased samples
of 89 gamma-ray-loud (Sample Identifier SID=1) and 15 gamma-ray-quiet
(SID=2) sources.
During the main monitoring programme, we regularly observed sources
belonging to two samples: the 'main' gamma-ray-loud sample (SID=3),
consisting of 62 sources selected by placing a photon-flux cut on
sources from the Second Fermi LAT Catalogue (2FGL; Nolan et al.
2012ApJS..199...31N 2012ApJS..199...31N, Cat. J/ApJS/199/31) and an additional optical
magnitude cut, as well as constraints on source visibility and
separation from other field sources; and the 'control' gamma-ray-quiet
sample (SID=4), of 15 sources selected based on their radio
variability properties and absence from 2FGL.
In addition to the 'main' and 'control' samples, during 2013-2014 we
monitored a sample of 24 individually-selected sources of high
interest. Moreover, 44 other AGNs were observed for different projects
along the project execution. These sources that have not been selected
with uniform criteria are assigned SID=5. In 2014, we also conducted a
distinct polarization monitoring programme focused on intermediate-
and high-synchrotron peaked BL Lac objects. This programme included 29
TeV-detected sources and 19 non-TeV sources (SID=6).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 128 222 Information on the sample sources
tablea2.dat 102 5068 Monitoring data
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Source name (RBPLJHHMM+DDMM)
16- 30 A15 --- OName Alternative name
32- 33 I2 h RAh Right ascension (J2000)
35- 36 I2 min RAm Right ascension (J2000)
38- 41 F4.1 s RAs Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 53 F4.1 arcsec DEs Declination (J2000)
55- 62 F8.6 --- z ? Redshift
64 A1 --- f_z Flag on z (1)
66- 84 A19 --- r_z Reference for z
86- 90 A5 --- SID Sample identifier (2)
92- 94 A3 arcsec Aperture Aperture (3)
96- 98 I3 --- Nmeas Number of measurements
100 I1 --- Nseas Number of seasons
102-106 F5.1 d tsamp ? Median time sampling interval
108-112 F5.2 % p0 ? Mean intrinsic polarization fraction
114-117 F4.2 --- mp ? Intrinsic modulation index of the
polarization fraction
119-122 F4.2 --- vX ? Variability index of the EVPA
124-128 F5.1 deg X0 ? Preferred EVPA orientation of less
variable sources
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Note (1): Flag as follows:
* = non-spectroscopic redshift
l = lower limit on redshift
m = multiple values are present in literature
Note (2): Sample identifier as follows:
1 = gamma-ray-loud subsample from the 'June survey' sample
2 = gamma-ray-quiet subsample from the 'June survey' sample
3 = gamma-ray-loud subsample from the monitoring sample
4 = gamma-ray-quiet subsample from the monitoring sample
5 = additional sample of 68 hand-picked sources of high interest
6 = ISP/HSP blazar sample
Note (3): 'v' denotes variable aperture
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Source name (RBPLJHHMM+DDMM)
16- 27 F12.4 d JD Julian date
29- 34 F6.3 --- Q/Iinst Relative Stokes parameter Q/I before the
instrumental polarization correction
36- 41 F6.4 --- e_Q/Iinst Error on Q/Iinst
43- 48 F6.3 --- U/Iinst Relative Stokes parameter U/I before the
instrumental polarization correction
50- 55 F6.4 --- e_U/Iinst Error on U/Iinst
57- 62 F6.3 --- Q/I Relative Stokes parameter Q/I after the
instrumental polarization correction
64- 68 F5.3 --- e_Q/I Error on Q/I
70- 75 F6.3 --- U/I Relative Stokes parameter U/I after the
instrumental polarization correction
77- 81 F5.3 --- e_U/I Error on U/I
83- 86 F4.1 % PD Fractional polarization
88- 91 F4.1 % e_PD Error on PD
93- 97 F5.1 deg EVPA The electric vector position angle
99-102 F4.1 deg e_EVPA Error on EVPA
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 18-Oct-2023