J/A+A/618/A92 Radio-loud NLSy1 galaxies optical polarisation (Angelakis+, 2018) ================================================================================ Optical polarisation variability of radio-loud narrow-line Seyfert 1 galaxies. Search for long rotations of the polarisation plane. Angelakis E., Kiehlmann S., Myserlis I., Blinov D., Eggen J., Itoh R., Marchili N., Zensus J.A. =2018A&A...618A..92A (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Active gal. nuclei ; Galaxies, optical ; Polarization Keywords: galaxies: active - galaxies: Seyfert - polarization - techniques: polarimetric - methods: numerical - methods: statistical Abstract: We quantify the temporal behaviour of the optical polarisation fraction and angle for a selected sample of radio-loud NLSy1s. We also search for rotations of the polarisation plane similar to those commonly observed in blazars. The dataset was obtained with the RoboPol polarimeter of the Skinakas observatory as well as the KANATA, Perkins, and Steward observatories. We carried out numerical simulations to assess the probability that long rotations of the polarisation plane were caused by intrinsically evolving electric vector position angles (EVPAs) instead of observational noise. We conclude that it is much more likely that intrinsic rotations are responsible for the observed phenomenology. Description: Polarisation fraction p and adjusted EVPA as a function of time for the ten radio-loud narrow-line Seyfert 1 galaxies presented in the paper. The polarisation fraction and EVPA measurements as well as the corresponding uncertainties have been corrected for the Rice bias as shown in Section 3 of the paper. Due to the inherent n-pi ambiguity, the EVPA measurements have been adjusted to minimize the the variability between adjacent data points. As discussed in Section 4 of the paper, we choose the EVPA values for which the difference from the previous data point is smaller than 90 degrees. The data correspond to Table 2 and Figures 1, 8 and 14 of the paper, as well as Figure 12 which shows a portion of Figure 8. The data are sorted first with the source identifier and then with the Julian date of the measurements. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file sources.dat 76 10 List of studied sources pol.dat 60 203 Optical polarisation data (full table2) -------------------------------------------------------------------------------- Byte-by-byte Description of file: sources.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- ID Source identifier 12- 34 A23 --- SurveyID Survey identifier 37- 38 I2 h RAh Right ascension (J2000) 40- 41 I2 min RAm Right ascension (J2000) 43- 48 F6.3 s RAs Right ascension (J2000) 50 A1 --- DE- Declination sign (J2000) 51- 52 I2 deg DEd Declination (J2000) 54- 55 I2 arcmin DEm Declination (J2000) 57- 61 F5.2 arcsec DEs Declination (J2000) 63- 65 I3 --- N Number of available measurements in pol.dat table 67- 74 F8.6 --- z Redshift 76 I1 --- r_z [1/4] Redshift reference (1) -------------------------------------------------------------------------------- Note (1): Redshift references as follows: 1 = Zhou et al. (2007ApJ...658L..13Z) 2 = Hewett & Wild (2010, Cat. J/MNRAS/405/2302) 3 = Foschini et al. (2015A&A...575A..13F) 4 = Oh et al. (2015, Cat. J/ApJS/219/1) -------------------------------------------------------------------------------- Byte-by-byte Description of file: pol.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 A10 --- ID Source identifier 12- 22 F11.3 d JD Julian date 25- 29 F5.3 --- p Debiased polarisation fraction 32- 36 F5.3 --- e_p 1-sigma uncertainty on p 40- 44 F5.1 deg EVPA Polarisation angle (EVPA) 47- 51 F5.1 deg e_EVPA 1-sigma uncertainty on EVPA 54- 60 A7 --- Tel Used optopolarimetric instrument (1) -------------------------------------------------------------------------------- Note (1): The Telescope identifiers are as follows: RoboPol = Optical polarization data from the RoboPol instrument of the Skinakas observatory Kanata = Optical polarization data from the KANATA instrument of the Higashi-Hiroshima Observatory Perkins = Optical polarization data from the PRISM instrument of the Lowell Observatory Steward = Optical polarization data from the Steward Observatory -------------------------------------------------------------------------------- Acknowledgements: Emmanouil Angelakis, eangelakis(at)mpifr-bonn.mpg.de, agele(at)physics.auth.gr Ioannis Myserlis, imyserlis(at)mpifr-bonn.mpg.de The RoboPol project is a collaboration between Caltech in the USA, MPIfR in Germany, the Torun Centre for Astronomy in Poland, the University of Crete/FORTH in Greece, and IUCAA in India. Data acquired with the Perkins telescope was funded by the PEGA RPE grant at Georgia State University. Data from the Steward Observatory spectropolarimetric monitoring project were used. This program is supported by Fermi Guest Investigator grants NNX08AW56G, NNX09AU10G, NNX12AO93G, and NNX15AU81G. ================================================================================ (End) Ioannis Myserlis [MPIfR, Germany], Patricia Vannier [CDS] 03-Sep-2018