2007ApJ...657..706N


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET10:45:29

2007ApJ...657..706N - Astrophys. J., 657, 706-724 (2007/March-2)

Does the blazar gamma-ray spectrum harden with increasing flux? Analysis of 9 years of EGRET data.

NANDIKOTKUR G., JAHODA K.M., HARTMAN R.C., MUKHERJEE R., SREEKUMAR P., BOTTCHER M., SAMBRUNA R.M. and SWANK J.H.

Abstract (from CDS):

The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory (CGRO) discovered gamma-ray emission from more than 67 blazars during its 9 yr lifetime. We conducted an exhaustive search of the EGRET archives and selected all the blazars that were observed multiple times and were bright enough to enable a spectral analysis using standard power-law models. The sample consists of 18 flat-spectrum radio quasars (FSRQs), 6 low-frequency peaked BL Lac objects (LBLs) and 2 high-frequency peaked BL Lac objects (HBLs). We do not detect any clear pattern in the variation of spectral index with flux. Some of the blazars do not show any statistical evidence for spectral variability. The spectrum hardens with increasing flux in a few cases. There is also evidence for a flux-hardness anticorrelation at low fluxes in five blazars. The well-observed blazars (3C 279, 3C 273, PKS 0528+134, PKS 1622-297, PKS 0208-512) do not show any overall trend in the long-term spectral dependence on flux, but the sample shows a mixture of hard and soft states. We observed a previously unreported spectral hysteresis at weekly timescales in all three FSRQs for which data from flares lasting for ~(3-4) weeks were available. All three sources show a counterclockwise rotation, despite the widely different flux profiles. We analyze the observed spectral behavior in the context of various inverse Compton mechanisms believed to be responsible for emission in the EGRET energy range. Our analysis uses the EGRET skymaps that were regenerated to include the changes in performance during the mission.

Abstract Copyright:

Journal keyword(s): Galaxies: Active - Methods: Data Analysis - Methods: Statistical - Radiation Mechanisms: Nonthermal

VizieR on-line data: <Available at CDS (J/ApJ/657/706): table2.dat table3.dat>

CDS comments: In table3, 0827+343 is a misprint for 0827+243 and 0917+499 is a misprint for 0917+449

Simbad objects: 84

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Number of rows : 84

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 B0119+041 QSO 01 21 56.86169956 +04 22 24.7343340   19.2 19.5 19.40   ~ 171 1
2 QSO B0130-17 QSO 01 32 43.48746261 -16 54 48.5218416   18.75 18.44 15.44   ~ 190 1
3 4C 15.05 Bla 02 04 50.41389571 +15 14 11.0436591   21.9 22.1 21.00   ~ 364 1
4 QSO B0208-512 BLL 02 10 46.2000629834 -51 01 01.893312084   17.10 16.93 14.82   ~ 391 1
5 3C 66A BLL 02 22 39.6111630878 +43 02 07.797284539   15.71 15.21 14.5   ~ 805 1
6 4C 28.07 QSO 02 37 52.40567732 +28 48 08.9900231     18.5 16.99   ~ 514 1
7 QSO B0235+1624 BLL 02 38 38.93010 +16 36 59.2746   16.46 15.50 15.92   ~ 1407 2
8 QSO B0336-0156 QSO 03 39 30.93778751 -01 46 35.8041062   18.96 18.41 17.33   ~ 515 1
9 QSO B0414-189 QSO 04 16 36.54445140 -18 51 08.3400284   18.89 18.0 18.51   ~ 147 1
10 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 866 1
11 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1081 3
12 QSO B0430+2859 BLL 04 33 37.82985993 +29 05 55.4770346   19.0 17.80 17.06   ~ 128 1
13 QSO B0440-003 QSO 04 42 38.66073910 -00 17 43.4203921   19.59 19.22 17.85   ~ 364 1
14 QSO B0446+113 BLL 04 49 07.67110088 +11 21 28.5964577     20 18.58   ~ 228 1
15 QSO B0454-463 QSO 04 55 50.7729726039 -46 15 58.684031092   17.89 17.4 16.87   ~ 190 1
16 QSO J0457-2324 QSO 04 57 03.1792314200 -23 24 52.020969479   18.85 18.5 16.56   ~ 346 1
17 4C -02.19 QSO 05 01 12.80988366 -01 59 14.2562534   19.1 18.4 19.04   ~ 529 1
18 QSO B0459+060 QSO 05 02 15.44593988 +06 09 07.4940469   19.7 19.5 18.3   ~ 73 1
19 QSO B0506-612 QSO 05 06 43.9895985805 -61 09 40.990800301   17.16 16.85 16.9   ~ 167 2
20 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 733 2
21 QSO J0530+13 QSO 05 30 56.41672 +13 31 55.1495     20.0 19.35   ~ 891 1
22 QSO B0537-441 BLL 05 38 50.36155219 -44 05 08.9389165   15.77 16.48 16   ~ 800 2
23 QSO B0537-286 QSO 05 39 54.28147645 -28 39 55.9478122   19.70 20.0 18.789   ~ 247 1
24 QSO B0539-057 QSO 05 41 38.08338 -05 41 49.4284     20.4 20.70   ~ 217 2
25 8C 0716+714 BLL 07 21 53.4484901266 +71 20 36.362058601   15.5 14.17 14.27   ~ 1150 1
26 QSO J0738+1742 BLL 07 38 07.39374766 +17 42 18.9982302   16.76 16.22 15.78   ~ 902 1
27 QSO B0805-077 QSO 08 08 15.53603615 -07 51 09.8862880     19.5 16.71   ~ 222 1
28 7C 080458.39+495918.00 QSO 08 08 39.66628353 +49 50 36.5304035   19.55 19.18 18.34   ~ 330 2
29 7C 082754.29+242103.00 QSO 08 30 52.08619070 +24 10 59.8204032   17.62 17.26 16.30   ~ 473 1
30 QSO B0829+047 BLL 08 31 48.8771360822 +04 29 39.086736269   17.10 16.4 14.55   ~ 424 2
31 4C 71.07 QSO 08 41 24.36526906 +70 53 42.1730054     16.5 16.8   ~ 705 1
32 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2050 1
33 6C 091740+445437 QSO 09 20 58.45848243 +44 41 53.9850927   18.40 18.16 16.55   ~ 330 1
34 4C 55.17 QSO 09 57 38.1845058338 +55 22 57.750865288   18.24 17.89     ~ 385 1
35 6C 095456+654857 BLL 09 58 47.2452838930 +65 33 54.821524491     17.0 15.75   ~ 626 1
36 6C 101157+494057 BLL 10 15 04.1393763275 +49 26 00.708524180   16.56 16.15 14.58   ~ 312 2
37 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2419 1
38 QSO J1130-1449 QSO 11 30 07.05259287 -14 49 27.3881476   17.17 16.90 16 16.97 ~ 638 1
39 Ton 599 QSO 11 59 31.83390975 +29 14 43.8268741   14.80 14.41 17.652 13.39 ~ 809 1
40 7C 1219+2830 BLL 12 21 31.6902446544 +28 13 58.500383827   16.81 16.11 14.24   ~ 788 1
41 4C 21.35 QSO 12 24 54.4583467193 +21 22 46.385219365   17.56 17.50 18.2   ~ 579 2
42 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5392 1
43 4C -02.55 QSO 12 32 00.0157879377 -02 24 04.790684994   17.41 17.06 16.4   ~ 387 1
44 QSO J1246-0730 QSO 12 46 04.23210358 -07 30 46.5745473   17.6 18.0 18.2   ~ 170 1
45 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2746 2
46 QSO B1313-333 QSO 13 16 07.98593995 -33 38 59.1725057   18.04 20.0 17.23   ~ 228 1
47 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4057 3
48 QSO B1324+224 QSO 13 27 00.86131377 +22 10 50.1629729     18.90 18.80   ~ 133 1
49 QSO B1331+170 QSO 13 33 35.7828550018 +16 49 04.012528106   16.84 16.71 16.41   ~ 415 0
50 QSO B1334-127 QSO 13 37 39.78277768 -12 57 24.6932620   18.5 18.5 16.22   ~ 437 1
51 QSO B1406-076 QSO 14 08 56.48120036 -07 52 26.6664200   20.3 18.4     ~ 273 1
52 QSO B1424-41 QSO 14 27 56.29756536 -42 06 19.4375991   18.48 17.7 16.30   ~ 374 1
53 QSO B1504-167 QSO 15 07 04.78696071 -16 52 30.2670781   18.40 18.5 17.00   ~ 217 1
54 QSO J1512-0906 QSO 15 12 50.53292491 -09 05 59.8295878   16.74 16.54     ~ 1175 1
55 QSO B1514-24 BLL 15 17 41.8135246339 -24 22 19.482167214   15.13 14.00 13.95   ~ 663 3
56 4C 15.54 BLL 16 07 06.4304649 +15 51 34.485357   20.15 19.49 17.5   ~ 147 2
57 4C 10.45 QSO 16 08 46.203185540 +10 29 07.77583000   18.5 18.0 18.03   ~ 344 1
58 6C 161147+342017 QSO 16 13 41.0645258703 +34 12 47.911898732   17.98 17.46 17.07   ~ 584 1
59 QSO B1622-253 QSO 16 25 46.89164010 -25 27 38.3267989   21.3 20.6 19.60   ~ 309 1
60 QSO B1622-297 QSO 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 373 0
61 4C 38.41 QSO 16 35 15.492970280 +38 08 04.50062279   18.14 17.97 17.25   ~ 761 1
62 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1947 2
63 ICRF J172824.9+042704 Sy1 17 28 24.95272422 +04 27 04.9139217   17.43 16.99 16.24   ~ 199 1
64 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 1002 1
65 4C 51.37 QSO 17 40 36.9779934388 +52 11 43.411910710   18.16 18.5 16.73   ~ 366 1
66 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 485 1
67 QSO B1830-211 QSO 18 33 39.92 -21 03 39.9     18.70 21   ~ 563 1
68 QSO B1908-202 QSO 19 11 09.65289198 -20 06 55.1089891   18.21   18.14   ~ 241 0
69 QSO B1933-400 QSO 19 37 16.21735166 -39 58 01.5529907   18.15 19 17.43   ~ 172 2
70 QSO B1936-155 QSO 19 39 26.65774750 -15 25 43.0584183   19.44 19.4 18.80   ~ 147 1
71 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 518 2
72 QSO J2025-0735 BLL 20 25 40.6599681095 -07 35 52.689195990   18.5       ~ 171 3
73 QSO B2032+107 QSO 20 35 22.3341660153 +10 56 06.789797044   17.96 16.37 17.4   ~ 164 1
74 QSO B2052-474 QSO 20 56 16.35981874 -47 14 47.6276461   18.29 19.1 18.07   ~ 267 1
75 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1586 1
76 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2031 1
77 QSO B2209+236 QSO 22 12 05.96631138 +23 55 40.5438272   19   19.69   ~ 195 1
78 4C 11.69 QSO 22 32 36.40890517 +11 43 50.9040717   17.75 17.33     ~ 997 2
79 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2549 2
80 ICRF J225805.9-275821 Sy1 22 58 05.96288481 -27 58 21.2567425   17.34 16.77 17.20   ~ 300 1
81 QSO B2320-035 QSO 23 23 31.95375451 -03 17 05.0237932   18.6   18.16   ~ 175 1
82 QSO B2346+385 QSO 23 49 20.82654 +38 49 17.5587   19.1       ~ 44 1
83 4C 45.51 QSO 23 54 21.68022839 +45 53 04.2365363   20.6 20.6 19.1   ~ 203 1
84 QSO B2356+196 QSO 23 58 46.0854250641 +19 55 20.304437585     18.0 17.37   ~ 108 1

    Equat.    Gal    SGal    Ecl

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2021.01.28-10:45:30

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