2012ApJ...744...80A

Query : 2012ApJ...744...80A

2012ApJ...744...80A - Astrophys. J., 744, 80 (2012/January-1)

Fermi large area telescope observations of the supernova remnant G8.7-0.1.

AJELLO M., ALLAFORT A., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BRIGIDA M., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CASANDJIAN J.M., CECCHI C., CHARLES E., CHEKHTMAN A., CIPRINI S., CLAUS R., COHEN-TANUGI J., CUTINI S., DE ANGELIS A., DE PALMA F., DERMER C.D., DO COUTO E SILVA E., DRELL P.S., DRLICA-WAGNER A., DUBOIS R., FAVUZZI C., FEGAN S.J., FERRARA E.C., FOCKE W.B., FRAILIS M., FUKAZAWA Y., FUKUI Y., FUSCO P., GARGANO F., GASPARRINI D., GERMANI S., GIGLIETTO N., GIOMMI P., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GROVE J.E., GUIRIEC S., HADASCH D., HANABATA Y., HARDING A.K., HAYASHI K., HAYS E., ITOH R., JOHANNESSON G., JOHNSON A.S., KAMAE T., KATAGIRI H., KATAOKA J., KNODLSEDER J., KUBO H., KUSS M., LANDE J., LATRONICO L., LEE S.-H., LIONETTO A.M., LONGO F., LOPARCO F., LOVELLETTE M.N., LUBRANO P., MAZZIOTTA M.N., MEHAULT J., MICHELSON P.F., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NAKAMORI T., NAUMANN-GODO M., NISHINO S., NOLAN P.L., NORRIS J.P., NUSS E., OHNO M., OHSUGI T., OKUMURA A., OMODEI N., ORLANDO E., ORMES J.F., PANEQUE D., PARENT D., PELASSA V., PESCE-ROLLINS M., PIERBATTISTA M., PIRON F., PORTER T.A., RAINO S., RANDO R., REIMER A., REIMER O., REPOSEUR T., ROTH M., SADROZINSKI H.F.-W., SGRO C., SISKIND E.J., SMITH P.D., SPANDRE G., SPINELLI P., SUSON D.J., TAJIMA H., TAKAHASHI H., TANAKA T., THAYER J.G., THAYER J.B., TIBALDO L., TIBOLLA O., TORRES D.F., TOSTI G., TRAMACERE A., TROJA E., UCHIYAMA Y., UEHARA T., USHER T.L., VANDENBROUCKE J., VAN ETTEN A., VASILEIOU V., VIANELLO G., VILCHEZ N., VITALE V., WAITE A.P., WANG P., WINER B.L., WOOD K.S., YAMAMOTO H., YAMAZAKI R., YANG Z., YASUDA H., ZIEGLER M. and ZIMMER S.

Abstract (from CDS):

We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4±0.6 (stat)±1.2 (sys) GeV, and photon indices of 2.10±0.06 (stat)±0.10 (sys) below the break and 2.70 ±0.12 (stat)±0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.

Abstract Copyright: ∼

Journal keyword(s): acceleration of particles - cosmic rays - gamma rays: ISM - ISM: individual (G8.7-0.1, HESS J1804-216) - ISM: supernova remnants

Simbad objects: 11

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Number of rows : 11
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 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
2 SNR G006.4-00.1 SNR 18 00 31.2011719 -23 25 48.001099           ~ 782 1
3 PSR J1803-2149 Psr 18 03 09.632 -21 49 00.87           ~ 34 0
4 PSR B1800-21 Psr 18 03 51.40000 -21 37 07.0000           ~ 278 1
5 1AGLR J1807-2103 gam 18 03 52.1 -21 10 54           ~ 79 0
6 Suzaku J1804-2140 X 18 04 34.0 -21 40 20           ~ 5 1
7 SNR G008.3-00.0 SNR 18 04.6 -21 49           ~ 27 1
8 W 30 SNR 18 05 31.2011719 -21 25 48.001099           ~ 188 1
9 PSR J1806-2124 Psr 18 06 19.59 -21 25 40.0           ~ 42 0
10 1FGL J1806.8-2109c gam 18 06 52 -21 09.8           ~ 4 0
11 PSR J1809-2332 Psr 18 09 50.250 -23 32 22.68     21.47 19.61 17.48 M5 103 0

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