2011A&A...525A..33C

Query : 2011A&A...525A..33C

2011A&A...525A..33C - Astronomy and Astrophysics, volume 525A33-33 (2011/1-1)

Study of the γ-ray source 1AGL J2022+4032 in the Cygnus region.

CHEN A.W., PIANO G., TAVANI M., TROIS A., DUBNER G., GIACANI E., ARGAN A., BARBIELLINI G., BULGARELLI A., CARAVEO P., CATTANEO P.W., COSTA E., D'AMMANDO F., DE PARIS G., DEL MONTE E., DI COCCO G., DONNARUMMA I., EVANGELISTA Y., FEROCI M., FERRARI A., FIORINI M., FUSCHINO F., GALLI M., GIANOTTI F., GIULIANI A., GIUSTI M., LABANTI C., LAZZAROTTO F., LIPARI P., LONGO F., MARISALDI M., MEREGHETTI S., MORETTI E., MORSELLI A., PACCIANI L., PELLIZZONI A., PEROTTI F., PICOZZA P., PILIA M., PREST M., PUCELLA G., RAPISARDA M., RAPPOLDI A., SABATINI S., SCALISE E., SOFFITTA P., STRIANI E., TRIFOGLIO M., VALLAZZA E., VERCELLONE S., VITTORINI V., ZAMBRA A., ZANELLO D., PITTORI C., GIOMMI P., VERRECCHIA F., LUCARELLI F., SANTOLAMAZZA P., COLAFRANCESCO S., ANTONELLI L.A. and SALOTTI L.

Abstract (from CDS):

Identification of γ-ray-emitting Galactic sources is a long-standing problem in astrophysics. One such source, 1AGL J2022+4032, coincident with the interior of the radio shell of the supernova remnant Gamma Cygni (SNR G78.2+2.1) in the Cygnus region, has recently been identified by Fermi as a γ-ray pulsar, LAT PSR J2021+4026. We present long-term observations of 1AGL J2022+4032 with the AGILE γ-ray telescope, measuring its flux and light curve. We compare the light curve of 1AGL J2022+4032 with that of 1AGL J2021+3652 (PSR J2021+3651), showing that the flux variability of 1AGL J2022+4032 appears to be greater than the level predicted from statistical and systematic effects and producing detailed simulations to estimate the probability of the apparent observed variability. We evaluate the possibility that the γ-ray emission may be due to the superposition of two or more point sources, some of which may be variable, considering a number of possible counterparts. We consider the possibility of a nearby X-ray quiet microquasar contributing to the flux of 1AGL J2022+4032 to be more likely than the hypotheses of a background blazar or intrinsic γ-ray variabilty of LAT PSR J2021+4026.

Abstract Copyright: ∼

Journal keyword(s): pulsars: individual: 1AGL J2022+4032 - gamma rays: stars - pulsars: individual: 1FGL J2021.5+4026 - pulsars: individual: LAT PSR J2021+4026 - pulsars: individual: 3EG J2020+4017

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
2 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
3 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
4 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 613 2
5 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4590 0
6 ARGO J2021+4038 gam 20 19 00.0 +40 42 00           ~ 33 1
7 NAME gam Cyg SNR SNR 20 20 17.100 +40 26 09.00           ~ 247 2
8 PSR J2021+3651 Psr 20 21 05.40 +36 51 04.5           ~ 218 1
9 GRO J2019+40 gam 20 21.5 +40 26           ~ 131 1
10 PSR J2021+4026 Psr 20 21 30.496 +40 26 53.56           ~ 300 2
11 USNO-B1.0 1304-00388702 X 20 21 30.655 +40 26 46.39           ~ 14 1
12 [WSC2006] S25 X 20 21 32.442 +40 24 59.18           ~ 4 0
13 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0
14 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2
15 1AGL J2032+4102 gam 20 32 27.70 +41 02 00.0           ~ 8 1
16 NAME Outer Arm PoG 21 48 +69.4           ~ 370 0
17 NAME Local Arm reg ~ ~           ~ 649 0

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