2002A&A...393L..37A

Query : 2002A&A...393L..37A

2002A&A...393L..37A - Astronomy and Astrophysics, volume 393, L37-40 (2002/10-2)

An unidentified TeV source in the vicinity of Cygnus OB2.

AHARONIAN F., AKHPERJANIAN A., BEILICKE M., BERNLOEHR K., BOERST H., BOJAHR H., BOLZ O., COARASA T., CONTRERAS J., CORTINA J., DENNINGHOFF S., FONSECA V., GIRMA M., GOETTING N., HEINZELMANN G., HERMANN G., HEUSLER A., HOFMANN W., HORNS D., JUNG I., KANKANYAN R., KESTEL M., KETTLER J., KOHNLE A., KONOPELKO A., KORNMEYER H., KRANICH D., KRAWCZYNSKI H., LAMPEITL H., LOPEZ M., LORENZ E., LUCARELLI F., MAGNUSSEN N., MANG O., MEYER H., MILITE M., MIRZOYAN R., MORALEJO A., ONA E., PANTER M., PLYASHESHNIKOV A., PRAHL J., PUEHLHOFER G., RAUTERBERG G., DE LOS REYES R., RHODE W., RIPKEN J., ROEHRING A., ROWELL G.P., SAHAKIAN V., SAMORSKI M., SCHILLING M., SCHROEDER F., SIEMS M., SOBZYNSKA D., STAMM W., TLUCZYKONT M., VOELK H.J., WIEDNER C.A., WITTEK W., UCHIYAMA Y. and TAKAHASHI T.

Abstract (from CDS):

Deep observation (∼113hrs) of the Cygnus region at TeV energies using the HEGRA stereoscopic system of air Cerenkov telescopes has serendipitously revealed a signal positionally inside the core of the OB association Cygnus OB2, at the edge of the 95% error circle of the EGRET source 3EG J2033+4118, and ∼0.5° north of Cyg X-3. The source centre of gravity is RA α_J2000: 20^hr32^m07^s±9.2^s_stat±2.2^s_sys, Dec δ_J2000: +41°30'30"±2.0'_stat±0.4'_sys. The source is steady, has a post-trial significance of +4.6σ, indication for extension with radius 5.6' at the ∼3σ level, and has a differential power-law flux with hard photon index of -1.9±0.3_stat±0.3_sys. The integral flux above 1 TeV amounts ∼3% that of the Crab. No counterpart for the TeV source at other wavelengths is presently identified, and its extension would disfavour an exclusive pulsar or AGN origin. If associated with Cygnus OB2, this dense concentration of young, massive stars provides an environment conducive to multi-TeV particle acceleration and likely subsequent interaction with a nearby gas cloud. Alternatively, one could envisage γ-ray production via a jet-driven termination shock.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: observations - stars: early-type - Galaxy: open clusters and associations: individual: Cygnus OB2

CDS comments: TeV source in the title is TeV J2032+4130 in SIMBAD

Simbad objects: 7

Full paper

View the references in ADS

Number of rows : 7

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Sp type	#ref 1850 - 2023	#notes
1	M 1	SNR	05 34 30.9	+22 00 53				~	6056	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024				~	5136	0
3	TeV J2032+4130	gam	20 31.7	+41 31				~	133	0
4	[MT91] 213	Be*	20 32 13.1247390384	+41 27 24.346666440	13.12	13.08	11.266	B0Vp	269	0
5	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9				WN4/5-6/7	1896	2
6	Ass Cyg OB 2	As*	20 33.2	+41 19				~	900	0
7	GeV J2035+4214	gam	20 35.0	+42 13				~	11	0

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