2008A&A...478..387A


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET20:49:24

2008A&A...478..387A - Astronomy and Astrophysics, volume 478, 387-393 (2008/2-1)

Upper limits from HESS active galactic nuclei observations in 2005-2007.

AHARONIAN F., AKHPERJANIAN A.G., BARRES DE ALMEIDA U., BAZER-BACHI A.R., BEHERA B., BEILICKE M., BENBOW W., BERNLOEHR K., BOISSON C., BOLZ O., BORREL V., BRAUN I., BRION E., BROWN A.M., BUEHLER R., BULIK T., BUESCHING I., BOUTELIER T., CARRIGAN S., CHADWICK P.M., CHOUNET L.-M., CLAPSON A.C., COIGNET G., CORNILS R., COSTAMANTE L., DALTON M., DEGRANGE B., DICKINSON H.J., DJANNATI-ATAIE A., DOMAINKO W., DRURY L.O'C., DUBOIS F., DUBUS G., DYKS J., EGBERTS K., EMMANOULOPOULOS D., ESPIGAT P., FARNIER C., FEINSTEIN F., FIASSON A., FOERSTER A., FONTAINE G., FUNK S., FUESSLING M., GALLANT Y.A., GIEBELS B., GLICENSTEIN J.F., GLUECK B., GORET P., HADJICHRISTIDIS C., HAUSER D., HAUSER M., HEINZELMANN G., HENRI G., HERMANN G., HINTON J.A., HOFFMANN A., HOFMANN W., HOLLERAN M., HOPPE S., HORNS D., JACHOLKOWSKA A., DE JAGER O.C., JUNG I., KATARZYNSKI K., KENDZIORRA E., KERSCHHAGGL M., KHELIFI B., KEOGH D., KOMIN N., KOSACK K., LAMANNA G., LATHAM I.J., LEMIERE A., LEMOINE-GOUMARD M., LENAIN J.-P., LOHSE T., MARTIN J.M., MARTINEAU-HUYNH O., MARCOWITH A., MASTERSON C., MAURIN D., MAURIN G., McCOMB T.J.L., MODERSKI R., MOULIN E., DE NAUROIS M., NEDBAL D., NOLAN S.J., OHM S., OLIVE J.-P., DE ONA WILHELMI E., ORFORD K.J., OSBORNE J.L., OSTROWSKI M., PANTER M., PEDALETTI G., PELLETIER G., PETRUCCI P.-O., PITA S., PUEHLHOFER G., PUNCH M., RANCHON S., RAUBENHEIMER B.C., RAUE M., RAYNER S.M., RENAUD M., RIPKEN J., ROB L., ROLLAND L., ROSIER-LEES S., ROWELL G., RUDAK B., RUPPEL J., SAHAKIAN V., SANTANGELO A., SCHLICKEISER R., SCHOECK F., SCHROEDER R., SCHWANKE U., SCHWARZBURG S., SCHWEMMER S., SHALCHI A., SOL H., SPANGLER D., STAWARZ L., STEENKAMP R., STEGMANN C., SUPERINA G., TAM P.H., TAVERNET J.-P., TERRIER R., VAN ELDIK C., VASILEIADIS G., VENTER C., VIALLE J.P., VINCENT P., VIVIER M., VOELK H.J., VOLPE F., WAGNER S.J., WARD M., ZDZIARSKI A.A. and ZECH A.

Abstract (from CDS):

Very high energy (VHE; E>100 GeV) γ-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. VHE observations of a sample of 14 AGN, considered candidate VHE emitters, were made with the High Energy Stereoscopic System (HESS) between January 2005 and July 2007. Large-zenith-angle observations of three northern AGN (Mkn421, Mkn501, 1ES1218+304), known to emit VHE γ-rays, were also performed in order to sample their spectral energy distributions (SEDs) above 1TeV. In addition, the VHE flux from 1ES1101-232, previously detected by HESS in 2004-2005, was monitored during 2006 and 2007. As significant detections from the HESS observation program are reported elsewhere, the results reported here are primarily integral flux upper limits. The average exposure for each of the 14 VHE-candidate AGN is ∼7h live time, and the observations have an average energy threshold between 230GeV and 590GeV. Upper limits for these 14 AGN range from <0.9% to <4.9% of the Crab Nebula flux, and eight of these are the most constraining ever reported for the object. The brief (<2.2h each) large-zenith-angle observations yield upper limits for Mkn501 (<20% Crab above 2.5TeV) and 1ES1218+304 (<17% Crab above 1.0TeV), and a marginal detection (3.5σ) of Mkn421 (50% Crab above 2.1TeV). 1ES1101-232 was marginally detected (3.6σ, 1.7% Crab above 260GeV) during the 2006 (13.7h live time) observations, but not in the 2007 (4.6h live time) data. The upper limit in 2007 (<1.9% Crab above 260GeV) is below the average flux measured by HESS from 2004-2006.

Abstract Copyright:

Journal keyword(s): galaxies: active - gamma rays: observations

Simbad objects: 29

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Number of rows : 29

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 Mrk 1501 Sy1 00 10 31.0058529490 +10 58 29.505989476   15.96 15.40 12.22   ~ 656 0
2 ICRF J021305.1+121310 BLL 02 13 05.1830398 +12 13 10.910759     21.15 19.9   ~ 15 1
3 QSO B0229+200 BLL 02 32 48.6154943841 +20 17 17.493345304   18.0 18.00     ~ 270 3
4 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 4176 2
5 QSO B0323+022 BLL 03 26 13.9474696478 +02 25 14.675022985   17.05 16.55 15.3   ~ 225 1
6 QSO B0347-121 BLL 03 49 23.1861664460 -11 59 27.368085519   18.74 18.2 17.46   ~ 185 0
7 NAME Pic A Sy1 05 19 49.7230919028 -45 46 43.855209977   15.73 15.77 14.85   ~ 576 1
8 QSO B0521-365 BLL 05 22 57.9839686440 -36 27 30.847737786   15.26 14.62 14.48   ~ 738 2
9 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5702 4
10 QSO B0548-322 BLL 05 50 40.5706739558 -32 16 16.488658537   16.07 15.5     ~ 373 1
11 QSO B0558-5026 BLL 05 59 47.3917733375 -50 26 52.026945176   15.18 14.97     ~ 250 1
12 2A 1058-226 BLL 11 03 37.6150843895 -23 29 31.202114088   17.00 16.55 16.61   ~ 325 2
13 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2426 1
14 QSO B1218+304 BLL 12 21 21.9427463316 +30 10 37.161573795   16.50 15.85 15.7   ~ 399 1
15 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5404 1
16 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6348 3
17 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2752 2
18 QSO B1553+113 BLL 15 55 43.0439413597 +11 11 24.365587666 14.91 14.72 14.57 13.99   ~ 438 1
19 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1954 2
20 QSO B2005-489 BLL 20 09 25.3910622923 -48 49 53.722146927   15.75 12.81 11.41   ~ 521 2
21 QSO B2155-304 BLL 21 58 52.0651817803 -30 13 32.120657891   13.36 13.09 12.62   ~ 1591 1
22 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 2037 1
23 9Y-MST J2243-1231 BLL 22 43 41.5559466456 -12 31 37.164698364       18.6   ~ 25 0
24 QSO B2250+194 BLL 22 53 07.3693349625 +19 42 34.626608636   17.5 17.5 16.22   ~ 63 2
25 NGC 7469 Sy1 23 03 15.674 +08 52 25.28 12.60 13.00 12.34     ~ 1917 3
26 MCG-07-47-031 BLL 23 19 05.8960426344 -42 06 48.342680946   16.60 15.46     ~ 93 1
27 NGC 7649 BiC 23 24 20.087 +14 38 49.68   15.65       ~ 51 1
28 2E 4760 BLL 23 45 38.4220236204 -14 49 28.776405372     19.2 17   ~ 25 0
29 QSO B2356-309 BLL 23 59 07.9032684889 -30 37 40.667900741   18.414 16.44 16.795   ~ 254 1

    Equat.    Gal    SGal    Ecl

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2021.02.26-20:49:24

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