Optical circular polarization in quasars | Astronomy & Astrophysics (A&A)

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Volume 520 (September-October 2010)

A&A, 520 (2010) L7

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Table 3:

Previous circular polarization measurements of quasars and BL Lac objects.
Object	z	$p_{\rm lin}$ (%)	$\theta _{\rm lin}$ ( $\hbox{$^\circ$ }$ )	$p_{\rm circ}$ (%)
0237-233	2.223	0.25 $\pm$ 0.29	-^d	-0.06 $\pm$ 0.08^a
0955+326	0.533	0.18 $\pm$ 0.24	-^c	0.06 $\pm$ 0.08^a
1127-145	1.187	1.30 $\pm$ 0.40	23 $\pm$ 10^e	0.32 $\pm$ 0.20^a
1156+295	0.729	2.68 $\pm$ 0.41	114 $\pm$ 4^f	0.12 $\pm$ 0.14^b
1222+228	2.058	1.09 $\pm$ 0.16 [u]	167 $\pm$ 4ⁱ	0.23 $\pm$ 1.80ⁱ
1226+023	0.158	0.25 $\pm$ 0.04	58 $\pm$ 4^c	-0.01 $\pm$ 0.02^g
1253-055	0.536	9.00 $\pm$ 0.40	67 $\pm$ 1^e	0.09 $\pm$ 0.07^a
1308+326	0.997	12.10 $\pm$ 1.50	68 $\pm$ 3^e	-0.08 $\pm$ 0.17^b
1634+706	1.334	0.24 $\pm$ 0.07 [u]	4 $\pm$ 8ⁱ	-0.05 $\pm$ 0.09ⁱ
1641+399	0.594	4.00 $\pm$ 0.30	103 $\pm$ 2^e	-0.05 $\pm$ 0.23^b
2230+114	1.037	7.30 $\pm$ 0.30	118 $\pm$ 1^e	-0.05 $\pm$ 0.17^a
2302+029	1.044	0.66 $\pm$ 0.12 [u]	136 $\pm$ 5ⁱ	-0.39 $\pm$ 0.16ⁱ
0138-097	0.733	3.60 $\pm$ 1.50	168 $\pm$ 11^e	0.25 $\pm$ 0.35^k
0219+428	0.444	26.11 $\pm$ 0.19	3 $\pm$ 1^k	0.16 $\pm$ 0.05^k
0422+004	0.310	10.29 $\pm$ 0.23	179 $\pm$ 1^g	0.14 $\pm$ 0.07^g
0735+178	0.424	11.69 $\pm$ 0.22	123 $\pm$ 1^k	0.03 $\pm$ 0.05^k
0823-223	0.910	14.39 $\pm$ 0.16	11 $\pm$ 1^k	0.16 $\pm$ 0.08^k
0851+202	0.306	10.80 $\pm$ 0.30	156 $\pm$ 1^e	-0.01 $\pm$ 0.02^a
1101+384	0.031	2.59 $\pm$ 0.11	10 $\pm$ 1^h	0.02 $\pm$ 0.03^h
2155-304	0.116	4.12 $\pm$ 0.25	93 $\pm$ 2^j	-0.02 $\pm$ 0.02^j
2200+420	0.068	4.90 $\pm$ 0.40	147 $\pm$ 2^e	-0.07 $\pm$ 0.19^a

Notes. All but a few polarization measurements were obtained in white light; the multi-color measurements in references (h), (j) and (k) were averaged; [u] refers to linear and circular polarization measurements averaged over the 2200-3200 Å ultraviolet wavelength band; the circular polarization of objects 2200+420 and 2230+114 was obtained in the 4000-6000 Å and 3500-5200 Å bands respectively; italicized names indicate objects classified as BL Lac in Véron-Cetty & Véron (2006). References for linear and circular polarization: ^(a) Landstreet & Angel (1972); ^(b) Moore & Stockman (1981); ^(c) Stockman et al. (1984); ^(d) Moore & Stockman (1984); ^(e) Impey & Tapia (1990); ^(f) Wills et al. (1992); ^(g) Valtaoja et al. (1993); ^(h) Takalo & Sillanpää (1993); ⁽ⁱ⁾ Impey et al. (1995); ^(j) Tommasi et al. (2001a); ^(k) Tommasi et al. (2001b).

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