2000A&A...353..847A

Query : 2000A&A...353..847A

2000A&A...353..847A - Astronomy and Astrophysics, volume 353, 847-852 (2000/1-3)

HEGRA search for TeV emission from BL Lacertae objects.

AHARONIAN F.A., AKHPERJANIAN A.G., BARRIO J.A., BERNLOEHR K., BOJAHR H., CALLE I., CONTRERAS J.L., CORTINA J., DAUM A., DECKERS T., DENNINGHOFF S., FONSECA V., GONZALEZ J.C., HEINZELMANN G., HEMBERGER M., HERMANN G., HESS M., HEUSLER A., HOFMANN W., HOHL H., HORNS D., IBARRA A., KANKANYAN R., KESTEL M., KETTLER J., KOEHLER C., KONOPELKO A., KORNMAYER H., KRANICH D., KRAWCZYNSKI H., LAMPEITL H., LINDNER A., LORENZ E., MAGNUSSEN N., MANG O., MEYER H., MIRZOYAN R., MORALEJO A., PADILLA L., PANTER M., PETRY D., PLAGA R., PLYASHESHNIKOV A., PRAHL J., PUEHLHOFER G., RAUTERBERG G., RENAULT C., RHODE W., ROEHRING A., SAHAKIAN V., SAMORSKI M., SCHMELE D., SCHILLING M., SCHROEDER F., STAMM W., VOELK H.J., WIEBEL-SOOTH B., WIEDNER C., WILLMER M. and WITTEK W.

Abstract (from CDS):

The HEGRA system of four Imaging Atmospheric Cherenkov Telescopes (IACTs) has been used to extensively observe extragalactic objects. In this paper we describe the search for TeV emission from nine very promising potential TeV sources, namely eight ``high frequency'' BL Lac objects (HBLs), and the object ``BL Lacertae'' itself. These objects were observed during 1997 and 1998 seasons, with total integration times ranging between one and fifteen hours. No evidence for emission was found from any of these objects and the upper limits on the integral energy flux above ∼750 GeV are on the level of a few times 10^–12erg/cm²/s. For the two objects BL Lacertae and 1ES 2344+51.4, we discuss the astrophysical implications of the TeV flux upper limit, using also information from the X-ray and γ-ray bands as measured with the All Sky Monitor (ASM) of RXTE (1.3-12.0keV) and with EGRET (30MeV-20GeV).

Abstract Copyright: ∼

Journal keyword(s): galaxies: BL Lacertae objects: general - galaxies: BL Lacertae objects: individual: 1ES 2344+51.4 - galaxies: BL Lacertae objects: individual: BL Lac - gamma rays: observations

Simbad objects: 11

View the references in ADS

Number of rows : 11

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2022	#notes
1	QSO B0145+138	BLL	01 48 29.7013033536	+14 02 17.848330656			17.90	16.7	~	45	0
2	3C 66A	BLL	02 22 39.6114771888	+43 02 07.799534304		15.71	15.21	14.5	~	835	1
3	QSO B0229+200	BLL	02 32 48.6148874688	+20 17 17.486717388		18.0	18.00		~	285	3
4	QSO B0317+18	BLL	03 19 51.8082475320	+18 45 34.562475432			18.12		~	195	0
5	QSO B0414+009	BLL	04 16 52.4945693352	+01 05 23.899102620		16.86	16.38	16	~	259	0
6	QSO B0647+250	BLL	06 50 46.4900658984	+25 02 59.625654828	16.17	15.97	15.79	16.3	~	131	2
7	QSO B0829+047	BLL	08 31 48.8770033992	+04 29 39.086842884		17.10	16.4	14.55	~	439	2
8	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2522	1
9	4C 39.49	BLL	16 53 52.2160772976	+39 45 36.613228860	14.09	14.15	13.29	8.26	~	2025	2
10	NAME BL Lac	BLL	22 02 43.2913536816	+42 16 39.979416792		15.66	14.72		~	2130	1
11	QSO B2344+514	BLL	23 47 04.8372110928	+51 42 17.877513168			15.50	10.7	~	411	0

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