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

Query : 2008A&A...478..387A

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

Full paper

View the references in ADS

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 - 2022	#notes
1	Mrk 1501	Sy1	00 10 31.0059809184	+10 58 29.506054872		15.96	15.40	12.22		~	675	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 48.6148874688	+20 17 17.486717388		18.0	18.00			~	283	3
4	M 77	GiP	02 42 40.7091669408	-00 00 47.859690204	9.70	9.61	8.87	10.1	9.9	~	4322	2
5	QSO B0323+022	BLL	03 26 13.9481827296	+02 25 14.675937708		17.05	16.55	15.3		~	230	1
6	QSO B0347-121	BLL	03 49 23.1862105584	-11 59 27.366035532		18.74	18.2	17.46		~	199	0
7	NAME Pic A	Sy1	05 19 49.7229323856	-45 46 43.852662732		15.73	15.77	14.85		~	603	1
8	QSO B0521-365	BLL	05 22 57.9841341216	-36 27 30.847204512		15.26	14.62	14.48		~	773	2
9	M 1	SNR	05 34 32	+22 00.8						~	5903	1
10	QSO B0548-322	BLL	05 50 40.5705144672	-32 16 16.484718648		16.07	15.5			~	383	1
11	QSO B0558-5026	BLL	05 59 47.3916612936	-50 26 52.025952120		15.18	14.97			~	264	1
12	2A 1058-226	BLL	11 03 37.6150845072	-23 29 31.203773520		17.00	16.55	16.61		~	341	2
13	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31		~	2512	1
14	QSO B1218+304	BLL	12 21 21.9426947832	+30 10 37.158534012		16.50	15.85	15.7		~	423	1
15	3C 273	BLL	12 29 06.6998257176	+02 03 08.597629980		13.05	14.830	14.11		~	5555	1
16	M 87	BiC	12 30 49.42338230	+12 23 28.0438581	10.16	9.59	8.63		7.49	~	6644	3
17	3C 279	Bla	12 56 11.1663795384	-05 47 21.528432492		18.01	17.75	15.87		~	2863	2
18	QSO B1553+113	BLL	15 55 43.0440048528	+11 11 24.365649948	14.91	14.72	14.57	13.99		~	480	1
19	4C 39.49	BLL	16 53 52.2160772976	+39 45 36.613228860	14.09	14.15	13.29	8.26		~	2016	2
20	QSO B2005-489	BLL	20 09 25.3903899240	-48 49 53.725051056		15.75	12.81	11.41		~	535	2
21	QSO B2155-304	BLL	21 58 52.0652249880	-30 13 32.118447792		13.36	13.09	12.62		~	1639	1
22	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72			~	2125	1
23	9Y-MST J2243-1231	BLL	22 43 41.5565321184	-12 31 37.162329456				18.6		~	24	0
24	QSO B2250+194	BLL	22 53 07.3691755584	+19 42 34.627791744		17.5	17.5	16.22		~	64	2
25	NGC 7469	Sy1	23 03 15.674	+08 52 25.28	12.60	13.00	12.34			~	1989	3
26	MCG-07-47-031	BLL	23 19 05.8954756632	-42 06 48.297034584		16.60	15.46			~	96	1
27	NGC 7649	BiC	23 24 20.087	+14 38 49.68		15.65				~	53	1
28	2E 4760	BLL	23 45 38.4249663576	-14 49 28.778832588			19.2	17		~	27	0
29	QSO B2356-309	BLL	23 59 07.9034996184	-30 37 40.671098544		18.414	16.44	16.795		~	267	1

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