2005A&A...431..197A


Query : 2005A&A...431..197A

2005A&A...431..197A - Astronomy and Astrophysics, volume 431, 197-202 (2005/2-3)

The unidentified TeV source (TeV J2032+4130) and surrounding field: Final HEGRA IACT-System results.

AHARONIAN F., AKHPERJANIAN A., BEILICKE M., BERNLOEHR K., BOERST H.-G., 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., KOHNLE A., KONOPELKO A., KRANICH D., LAMPEITL H., LOPEZ M., LORENZ E., LUCARELLI F., MANG O., MAZIN D., MEYER H., MIRZOYAN R., MORALEJO A., ONA-WILHELMI E., PANTER M., PLYASHESHNIKOV A., PUEHLHOFER G., DE LOS REYES R., RHODE W., RIPKEN J., ROWELL G.P., SAHAKIAN V., SAMORSKI M., SCHILLING M., SIEMS M., SOBZYNSKA D., STAMM W., TLUCZYKONT M., VITALE V., VOELK H.J., WIEDNER C.A. and WITTEK W.

Abstract (from CDS):

The unidentified TeV source in Cygnus is now confirmed by follow-up observations from 2002 with the HEGRA stereoscopic system of Cherenkov Telescopes. Using all data (1999 to 2002) we confirm this new source as steady in flux over the four years of data taking, extended with radius 6.2' (±1.2'stat±0.9'sys) and exhibiting a hard spectrum with photon index -1.9. It is located in the direction of the dense OB stellar association, Cygnus OB2. Its integral flux above energies E>1TeV amounts to ∼5% of the Crab assuming a Gaussian profile for the intrinsic source morphology. There is no obvious counterpart at radio, optical nor X-ray energies, leaving TeV J2032+4130 presently unidentified. Observational parameters of this source are updated here and some astrophysical discussion is provided. Also included are upper limits for a number of other interesting sources in the FoV, including the famous microquasar Cygnus X-3.

Abstract Copyright:

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

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 GeV J2026+4124 gam 20 26.5 +41 25           ~ 5 0
2 AX J2027.6+4116 X 20 27 33.8 +41 16 12           ~ 2 0
3 TeV J2032+4130 gam 20 32.1 +41 34           ~ 128 0
4 [MT91] 213 Be* 20 32 13.1247390384 +41 27 24.346666440 13.12 13.08 11.266     B0Vp 262 0
5 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 1883 2
6 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 890 0
7 GeV J2035+4214 gam 20 35.0 +42 13           ~ 11 0

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2023.02.04-09:36:59

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