Access to Astronomical Catalogues

← Click to display the menu
J/ApJS/194/19       Optical linear polarization at McDonald Obs.  (Wills+, 2011)

McDonald Observatory archive of optical linear polarization measurements. Wills B.J., Wills D., Breger M. <Astrophys. J. Suppl. Ser., 194, 19 (2011)> =2011ApJS..194...19W
ADC_Keywords: Polarization ; QSOs ; Active gal. nuclei Keywords: catalogs - polarization - quasars: general Abstract: We present 976 previously unpublished optical linear polarization measurements of quasars, active galactic nuclei, and some stars observed for interstellar polarization. The observations, covering the period 1981-2000, were made with McDonald Observatory's 2.1m Struve reflector and the Breger photopolarimeter. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 176 976 McDonald Observatory broadband linear polarization archive for 290 quasars, AGN or stars
See also: J/ApJS/187/64 : The simultaneous optical-to-X-ray SED of AGNs (Grupe+, 2010) J/A+A/433/757 : Optical polarization of 203 QSOs (Sluse+, 2005) J/A+A/415/549 : High-frequency polarization of Kuehr sources (Ricci+, 2004) J/A+A/427/107 : Polarization in BAL QSOs (Lamy+, 2004) J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002) J/A+A/363/141 : Radio-loud galaxies in the ROSAT survey. IV. (Reich+, 2000) J/A+AS/142/451 : Optical Polarization of 47 QSOs (Lamy+, 2000) J/ApJ/512/125 : Polarization of broad absorption line QSOs (Schmidt+, 1999) J/A+AS/129/87 : ROSAT RASS II observations of IRAS galaxies (Boller+ 1998) J/A+A/332/410 : Quasar polarization (Hutsemekers 1998) J/A+A/340/371 : Quasar polarization (Hutsemekers+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Name IAU source name from B1950 coordinates 11- 18 A8 --- OName Other source name or survey designation 20- 22 A3 --- n_Name [ISP ] Bright star flag (1) 24- 33 A10 "YYYY/MM/DD" Obs.Date ? UT date of the observation 35- 44 F10.4 d MJD ? Modified Julian Date of observation (2) 46- 51 F6.3 % Pol ? Percentage polarization 53- 57 F5.3 % e_Pol ? RMS uncertainty in Pol (3) 59- 64 F6.2 deg polPA ? Polarisation position angle (4) 66- 75 A10 --- Filter Filter used in the observation (5) 77-153 A77 --- Notes Notes on the source observed (6) 155-176 A22 --- Program Program information data obtained under (7)
Note (1): For a given quasar the flag "ISP" indicates the given measurements are of a nearby bright star that may be suitable for constraining the Galactic interstellar polarization towards the quasar. Note (2): MJD=JD-2400000.5. Where there is only a single measurement of a source on one night, we assume UT 7 hours to correct approximately to the average MJD for that night at McDonald Observatory. Where there are several observations on a given night, the MJD is given to an accuracy of a few seconds. Note (3): The uncertainty, which is always dominated by photon statistics, is determined from the count rates on 'object plus sky' and sky. Note (4): from North to East. A good estimate of the statistical uncertainties in PA is given by 28.65°*e_Pol/Pol. The uncertainty in defining the zero point of PA is about 1 degree. Note (5): No entry means no filter. Sometimes, where spectral dependence of polarization has been measured, we have also combined results from different filters, as indicated. U, B, and V are similar to Johnson system filters, with effective wavelengths of approximately 0.35um(U), 0.44um (B), and 0.54um (V). Interference filters were chosen to more accurately define the wavelengths at R(0.65um) and I(0.75um) bands. For faint QSOs, we have used a copper sulfate filter (CuSO4) for the blue, and a Schott RG630 glass filter (usually 3mm thick) for the red. See section 2 for further details. Note (6): Gives other source names, especially where there may be ambiguity in the short name information of columns 1 and 2, or as a way of identifying the stars chosen for ISP measurements. We also indicate where non-standard apertures were used, although this information may not be complete. Reference and note therein are: Kuhr77 = Kuhr (1977A&AS...29..139K); Meisenheimer+83 = Meisenheimer & Roser (1983A&AS...51...41M); Tapia+77 = Tapia et al. (1977ApJ...215L..71T). Q = QSO; BALQ = Broad Absorption Line Quasar; gal = galaxy; obj = object; obv = obvious; nucl = nucleus; pol = polarization; brt = bright; fnt = faint; obsd = observed. Note (7): The sample, project name, or principal investigator as follows: Bol = Observations of ROSAT-IRAS identifications (Boller et al. 1998, Cat. J/A+AS/129/87); DGSX = Observations for D. Grupe's sample of ROSAT soft-X-ray-selected AGN (Grupe et al. 1998A&A...333..827G); for sample selection, see Grupe et al. (2010, Cat. J/ApJS/187/64); DW = Derek Wills' program for monitoring OJ 287 and other blazars; I92 = C. Impey, private communication; PS = Prajval Shastri's quasars of low radio core-dominance;
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 25-Jul-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

catalogue service

© UDS/CNRS

Contact