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

Full paper

View the references in ADS

Number of rows : 12

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	QSO B0138-097	BLL	01 41 25.83216015	-09 28 43.6742470	16.94	16.55	17.21	~	267	3
2	3C 66A	BLL	02 22 39.6114771888	+43 02 07.799534304	15.71	15.21	14.5	~	872	1
3	QSO B0301-243	BLL	03 03 26.5025589984	-24 07 11.426291220	16.55	16.18		~	210	1
4	QSO B0414+009	BLL	04 16 52.4945693352	+01 05 23.899102620	16.86	16.38	16	~	273	0
5	8C 0716+714	BLL	07 21 53.4482942664	+71 20 36.363846516	15.5	15.50	14.27	~	1263	1
6	QSO J0738+1742	BLL	07 38 07.39375312	+17 42 18.9981506	16.76	16.22	15.78	~	968	1
7	QSO B0823-223	BLL	08 26 01.5730900658	-22 30 27.204409684	16.11	16.20		~	200	1
8	QSO J0854+2006	BLL	08 54 48.8749846272	+20 06 30.639583620	15.91	15.43	15.56	~	2275	1
9	7C 1308+3236	BLL	13 10 28.66385420	+32 20 43.7828340	15.61	15.24	17.91	~	827	1
10	QSO B2005-489	BLL	20 09 25.3903899240	-48 49 53.725051056	15.75	12.81	11.41	~	560	2
11	QSO B2155-304	BLL	21 58 52.0652249880	-30 13 32.118447792	13.36	13.09	12.62	~	1698	1
12	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792	15.66	14.72		~	2215	1

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