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J/A+A/529/A162   Optically selected BL Lac candidates polarimetry (Heidt+, 2011)

Polarimetry of optically selected BL Lac candidates from the SDSS. Heidt J., Nilsson K. <Astron. Astrophys. 529, A162 (2011)> =2011A&A...529A.162H
ADC_Keywords: Active gal. nuclei ; BL Lac objects ; Polarization Keywords: polarization - techniques: polarimetric - BL Lacertae objects: general - galaxies: active Description: 195 polarimetric measurements of 182 BL Lac candidates from the SDSS taken with 3 different telescopes are presented. For each candidate the J2000 coordinates, its redshift, whether a source is listed in NED, the SDSS r-mag, the telescope for the observations used, the date of the observations, the exposure time for an individual exposure per position angle, the measured degree of polarization, the position angle and references to previous measurements of the sources are given. 13 objects have been observed twice. Here no entry for the coordinates is given. The redshifts, NED-listing and SDSS r-mags have been taken from Collinge et al. (2005, Cat. J/AJ/129/2542). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 86 195 195 polarimetric measurements of 182 BL Lac candidates
See also: J/AJ/129/2542 : BL Lac from SDSS (Collinge+, 2005) : SDSS Home Page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 h RAh Right ascension (J2000.0) 3- 4 I2 min RAm Right ascension (J2000.0) 5- 9 F5.2 s RAs Right ascension (J2000.0) 10 A1 --- DE- Declination sign (J2000.0) 11- 12 I2 deg DEd Declination (J2000.0) 13- 14 I2 arcmin DEm Declination (J2000.0) 15- 18 F4.1 arcsec DEs Declination (J2000.0) 20 A1 --- l_z Limit flag for redshift 21- 26 F6.4 --- z ? Redshift 27 A1 --- u_z [?] Uncertainty flag for redshift 29 A1 --- NED [Y] Listed in NED 31- 35 F5.2 mag rmag ? SDSS r magnitude 37- 39 A3 --- Tel Telescope used (1) 41- 50 A10 "YYYY-MM-DD" Date Date of observation 52- 55 I4 s t.exp Exposure time per position angle 57 A1 --- l_Pol Upper limit for polarization 58- 62 F5.2 % Pol Polarization degree in percent 64- 67 F4.2 % e_Pol ? Error for polarization degree 69- 73 F5.1 deg PA ? Polarization angle 75- 77 F3.1 deg e_PA ? Error for polarization angle 79- 86 A8 --- Prev Previous observations (2)
Note (1): Telescope code as follows: NTT = ESO-NTT, La Silla, Chile CA = Calar Alto 2.2m telescope, Spain NOT = Nordic Optical Telescope, La Palma, Spain. Note (2): Previous observations code as follows: S07 = Smith et al. (2007ApJ...663..118S) P10b = Plotkin et al. (2010ApJ...721..562P)
Acknowledgements: Jochen Heidt, jheidt(at)
(End) J. Heidt [ZAH, Heidelberg, Germany], P. Vannier [CDS] 17-Mar-2011
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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