2010A&A...512A..24S

Query : 2010A&A...512A..24S

2010A&A...512A..24S - Astronomy and Astrophysics, volume 512, A24-24 (2010/3-1)

Relativistic beaming and gamma-ray brightness of blazars.

SAVOLAINEN T., HOMAN D.C., HOVATTA T., KADLER M., KOVALEV Y.Y., LISTER M.L., ROS E. and ZENSUS J.A.

Abstract (from CDS):

We investigate the dependence of γ-ray brightness of blazars on intrinsic properties of their parsec-scale radio jets and the implication for relativistic beaming. By combining apparent jet speeds derived from high-resolution VLBA images from the MOJAVE program with millimetre-wavelength flux density monitoring data from Metsaehovi Radio Observatory, we estimate the jet Doppler factors, Lorentz factors, and viewing angles for a sample of 62 blazars. We study the trends in these quantities between the sources which were detected in γ-rays by the Fermi Large Area Telescope (LAT) during its first three months of science operations and those which were not detected.The LAT-detected blazars have on average higher Doppler factors than non-LAT-detected blazars, as has been implied indirectly in several earlier studies. We find statistically significant differences in the viewing angle distributions between γ-ray bright and weak sources. Most interestingly, γ-ray bright blazars have a distribution of comoving frame viewing angles that is significantly narrower than that of γ-ray weak blazars and centred roughly perpendicular to the jet axis. The lack of γ-ray bright blazars at large comoving frame viewing angles can be explained by relativistic beaming of γ-rays, while the apparent lack of γ-ray bright blazars at small comoving frame viewing angles, if confirmed with larger samples, may suggest an intrinsic anisotropy or Lorentz factor dependence of the γ-ray emission.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: jets - quasars: general - BL Lacertae objects: general

Simbad objects: 62

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Number of rows : 62
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 QSO B0003-066 BLL 00 06 13.89288482 -06 23 35.3353584   19.1 18.50 17.14   ~ 329 1
2 QSO B0016+73 QSO 00 19 45.78637230 +73 27 30.0176020     19.00 18.26   ~ 296 1
3 4C 01.02 Bla 01 08 38.77110544 +01 35 00.3171844   18.54 18.39 19.05   ~ 543 1
4 QSO B0109+224 BLL 01 12 05.8247044608 +22 44 38.785880796   16.00 15.66 15.47   ~ 343 2
5 6C 013354+473615 Bla 01 36 58.59480326 +47 51 29.1000720     19.50 19.25 15.21 ~ 501 1
6 4C 15.05 Bla 02 04 50.41389294 +15 14 11.0436097   21.9 21.00 21.00   ~ 412 1
7 6C 021252+733537 BLL 02 17 30.81335327 +73 49 32.6217355     19.00 18.97   ~ 455 1
8 4C 28.07 QSO 02 37 52.40567519 +28 48 08.9899986     19.30 16.99   ~ 613 1
9 QSO B0235+1624 BLL 02 38 38.93010450 +16 36 59.2745528   16.46 15.50 15.92   ~ 1546 2
10 6C 033321+320838 Bla 03 36 30.10760267 +32 18 29.3422162     17.50 16.6   ~ 654 1
11 QSO B0336-0156 QSO 03 39 30.93778633 -01 46 35.8041892   18.96 18.41 17.33   ~ 557 1
12 QSO B0420-0127 QSO 04 23 15.80072217 -01 20 33.0656073   17.50 17.00 16.28   ~ 1207 3
13 4C -02.19 QSO 05 01 12.80988538 -01 59 14.2564557   19.1 18.06 19.04   ~ 585 1
14 QSO J0530+13 Bla 05 30 56.41674741 +13 31 55.1494688     20.00 19.35   ~ 959 1
15 QSO B0605-0834 BLL 06 07 59.69924014 -08 34 49.9783246     17.60 17.70   ~ 460 1
16 7C 064253.00+445430.00 QSO 06 46 32.02599653 +44 51 16.5901185   19.57 18.49 18.64   ~ 348 1
17 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 15.50 14.27   ~ 1301 1
18 QSO B0736+01 QSO 07 39 18.03389906 +01 37 04.6177501   16.90 16.47 16.19   ~ 687 1
19 QSO B0754+10 BLL 07 57 06.64295154 +09 56 34.8522544   15.43 15.00 15.99   ~ 439 1
20 7C 080458.39+495918.00 QSO 08 08 39.66628970 +49 50 36.5304041   19.55 19.18 18.34   ~ 362 2
21 7C 081451.89+423206.00 BLL 08 18 15.99961476 +42 22 45.4148987   18.88 18.18 17.81   ~ 400 1
22 ICRF J083052.0+241059 Sy1 08 30 52.08619250 +24 10 59.8202919   17.62 17.26 16.30   ~ 529 1
23 4C 71.07 Bla 08 41 24.36528508 +70 53 42.1730435     17.30 16.8   ~ 777 1
24 QSO J0854+2006 BLL 08 54 48.8749846272 +20 06 30.639583620   15.91 15.43 15.56   ~ 2331 1
25 ICRF J092703.0+390220 Sy1 09 27 03.01394144 +39 02 20.8518067   17.17 17.00 16.486   ~ 1001 1
26 4C 40.24 QSO 09 48 55.33815103 +40 39 44.5869471   18.31 18.02 17.85   ~ 351 1
27 ICRF J105829.6+013358 Sy1 10 58 29.60520810 +01 33 58.8237454   18.74 18.28 16.68   ~ 776 2
28 Ton 599 Sy1 11 59 31.83391383 +29 14 43.8268224   14.80 14.41 17.652 13.39 ~ 925 1
29 ICRF J122454.4+212246 Sy1 12 24 54.4583146056 +21 22 46.385507388   17.56 17.50 18.2   ~ 704 2
30 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5802 1
31 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3045 2
32 US 371 BLL 13 10 28.66385420 +32 20 43.7828340   15.61 15.24 17.91   ~ 852 1
33 QSO B1324+224 QSO 13 27 00.86131319 +22 10 50.1628385     18.90 18.80   ~ 170 1
34 QSO B1334-127 Bla 13 37 39.78278132 -12 57 24.6933925   18.5 19.00 16.22   ~ 503 1
35 ICRF J141558.8+132023 Sy2 14 15 58.81751033 +13 20 23.7128587   21.055 20.000 18.461   ~ 437 1
36 QSO B1502+1041 Bla 15 04 24.97978391 +10 29 39.1985309   18.97 18.56 18.94   ~ 574 1
37 QSO J1512-0906 Bla 15 12 50.53293048 -09 05 59.8297908   16.74 16.54     ~ 1316 1
38 ICRF J154049.4+144745 Sy1 15 40 49.49151924 +14 47 45.8846989   17.72 17.30 17.240   ~ 422 1
39 4C 10.45 QSO 16 08 46.20318700 +10 29 07.7757424   18.5 18.70 18.03   ~ 383 1
40 6C 161147+342017 QSO 16 13 41.06424322 +34 12 47.9088535   17.98 17.46 17.07   ~ 642 1
41 4C 38.41 QSO 16 35 15.49297809 +38 08 04.5005995   18.14 17.97 17.25   ~ 858 1
42 ICRF J163813.4+572023 Sy1 16 38 13.45629995 +57 20 23.9789828     16.90 16.94   ~ 359 1
43 NAME Her B Sy1 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1725 2
44 QSO B1730-130 QSO 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1138 1
45 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 413 1
46 QSO B1741-038 QSO 17 43 58.85613537 -03 50 04.6167326     20.40 17.98   ~ 548 1
47 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 945 1
48 8C 1803+784 BLL 18 00 45.6838528560 +78 28 04.018028016   16.4 15.90 15.46   ~ 741 1
49 3C 371 BLL 18 06 50.6802916920 +69 49 28.109609256   14.77 14.22 11.39   ~ 857 2
50 4C 56.27 BLL 18 24 07.06837171 +56 51 01.4908155   18.9 19.30 16.48   ~ 482 1
51 ICRF J182931.7+484446 Sy1 18 29 31.7809732968 +48 44 46.160168892   17.05 16.81 16.860   ~ 688 1
52 4C 73.18 BLL 19 27 48.4947009120 +73 58 01.572558816     16.06 15.11   ~ 534 2
53 QSO J2123+0535 QSO 21 23 44.51739933 +05 35 22.0930238   18.3 20.40 19.86   ~ 294 1
54 QSO B2134+0028 QSO 21 36 38.58632232 +00 41 54.2128562   17.30 17.08 17.02   ~ 562 2
55 QSO B2136+1410 QSO 21 39 01.30926630 +14 23 35.9921774     18.90 18.22   ~ 248 1
56 4C 06.69 Bla 21 48 05.45866779 +06 57 38.6041877   16.85 16.47 15.06   ~ 676 1
57 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2259 1
58 4C 31.63 BLL 22 03 14.9756830008 +31 45 38.269473228   15.85 15.58 14.33   ~ 495 1
59 3C 446 BLL 22 25 47.25929101 -04 57 01.3907626   18.83 18.39 16.3   ~ 830 1
60 QSO B2227-0848 Bla 22 29 40.08433313 -08 32 54.4355294   17.80 17.41 17.81   ~ 360 1
61 4C 11.69 Bla 22 32 36.40890093 +11 43 50.9040592   17.75 17.33     ~ 1119 2
62 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 2848 2

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