2001A&A...376...51T


Query : 2001A&A...376...51T

2001A&A...376...51T - Astronomy and Astrophysics, volume 376, 51-58 (2001/9-2)

Multiband optical polarimetry of BL Lacertae objects with the Nordic Optical Telescope.

TOMMASI L., PALAZZI E., PIAN E., PIIROLA V., PORETTI E., SCALTRITI F., SILLANPAEAE A., TAKALO L. and TREVES A.

Abstract (from CDS):

Optical polarization of seven selected BL Lac objects in UBVRI bands was studied with the Nordic Optical Telescope from December 10-14, 1999. Two of them, 3C 66A and PKS 0735+178, were monitored for 4 nights for a total integration time of 4.75 and 5.5 hours, respectively. Other objects (1Jy 0138-097, H 0414+009, PKS 0823-223, OJ287 and BL Lac) were observed sparsely during the run. Apart from PKS 0823-223 (more polarized than observed in the past), the sources show levels of flux and polarization consistent with results at previous epochs. 3C 66A and PKS 0735+178 were intensively observed during December 11 and 12 and exhibited variability of polarization, both on internight and intranight time scales. Wavelength dependence of polarization has been investigated, as well as circular polarization. The results are discussed within the standard model for BL Lacs.

Abstract Copyright:

Journal keyword(s): polarization - radiation mechanisms: non-thermal - galaxies: active - BL Lacertae objects: general - BL Lacertae objects: individual: 3C 66A - BL Lacertae objects: individual: PKS 0735+178

CDS comments: S5 0716+174 is a misprint for S5 0716+714.

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO B0138-097 BLL 01 41 25.83215547 -09 28 43.6741894   16.94 16.55 17.21   ~ 251 3
2 3C 66A BLL 02 22 39.6111630878 +43 02 07.797284539   15.71 15.21 14.5   ~ 814 1
3 QSO B0301-243 BLL 03 03 26.5029737074 -24 07 11.423823772   16.55 16.18     ~ 183 1
4 QSO B0414+009 BLL 04 16 52.4945787354 +01 05 23.896410061   16.86 16.38 16   ~ 250 0
5 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1167 1
6 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 909 1
7 QSO B0823-223 BLL 08 26 01.57293454 -22 30 27.2032544   16.11 16.20     ~ 189 1
8 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2096 1
9 7C 1308+3236 BLL 13 10 28.66387 +32 20 43.7831   15.61 15.24 17.91   ~ 773 1
10 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 525 2
11 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1610 1
12 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2067 1

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2021.08.02-07:57:17

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