2010A&A...512A...7A

Query : 2010A&A...512A...7A

2010A&A...512A...7A - Astronomy and Astrophysics, volume 512A7-7 (2010/3-1)

Observations of the Large Magellanic Cloud with Fermi.

ABDO A.A., ACKERMANN M., AJELLO M., ATWOOD W.B., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BAUGHMAN B.M., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BURNETT T.H., BUSON S., CALIANDRO G.A., CAMERON R.A., CARAVEO P.A., CASANDJIAN J.M., CECCHI C., CELIK O., CHEKHTMAN A., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., COMINSKY L.R., CONRAD J., CUTINI S., DERMER C.D., DE ANGELIS A., DE PALMA F., DIGEL S.W., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., FARNIER C., FAVUZZI C., FEGAN S.J., FOCKE W.B., FORTIN P., FRAILIS M., FUKAZAWA Y., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GERMANI S., GIAVITTO G., GIEBELS B., GIGLIETTO N., GIORDANO F., GLANZMAN T., GODFREY G., GOTTHELF E.V., GRENIER I.A., GRONDIN M.-H., GROVE J.E., GUILLEMOT L., GUIRIEC S., HANABATA Y., HARDING A.K., HAYASHIDA M., HAYS E., HORAN D., HUGHES R.E., JACKSON M.S., JEAN P., JOHANNESSON G., JOHNSON A.S., JOHNSON R.P., JOHNSON T.J., JOHNSON W.N., KAMAE T., KATAGIRI H., KATAOKA J., KAWAI N., KERR M., KNOEDLSEDER J., KOCIAN M.L., KUSS M., LANDE J., LATRONICO L., LEMOINE-GOUMARD M., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MADEJSKI G.M., MAKEEV A., MARSHALL F., MARTIN P., MAZZIOTTA M.N., McCONVILLE W., McENERY J.E., MEURER C., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., NOLAN P.L., NORRIS J.P., NUSS E., OHSUGI T., OMODEI N., ORLANDO E., ORMES J.F., PANEQUE D., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PORTER T.A., RAINO S., RANDO R., RAZZANO M., REIMER A., REIMER O., REPOSEUR T., RITZ S., RODRIGUEZ A.Y., ROMANI R.W., ROTH M., RYDE F., SADROZINSKI H.F.-W., SANCHEZ D., SANDER A., SAZ PARKINSON P.M., SCARGLE J.D., SELLERHOLM A., SGRO C., SISKIND E.J., SMITH D.A., SMITH P.D., SPANDRE G., SPINELLI P., STARCK J.-L., STRICKMAN M.S., STRONG A.W., SUSON D.J., TAJIMA H., TAKAHASHI H., TANAKA T., THAYER J.B., THAYER J.G., THOMPSON D.J., TIBALDO L., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VASILEIOU V., VENTER C., VILCHEZ N., VITALE V., WAITE A.P., WANG P., WELTEVREDE P., WINER B.L., WOOD K.S., YLINEN T. and ZIEGLER M.

Abstract (from CDS):

The Large Magellanic Cloud (LMC) is to date the only normal external galaxy that has been detected in high-energy gamma rays. High-energy gamma rays trace particle acceleration processes and gamma-ray observations allow the nature and sites of acceleration to be studied. We characterise the distribution and sources of cosmic rays in the LMC from analysis of gamma-ray observations. We analyse 11 months of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope and compare it to tracers of the interstellar medium and models of the gamma-ray sources in the LMC. The LMC is detected at 33σ significance. The integrated >100MeV photon flux of the LMC amounts to (2.6±0.2)x10–7ph/cm2/s which corresponds to an energy flux of (1.6±0.1)x10–10erg/cm2/s, with additional systematic uncertainties of ≲16%. The analysis reveals the massive star forming region 30 Doradus as a bright source of gamma-ray emission in the LMC in addition to fainter emission regions found in the northern part of the galaxy. The gamma-ray emission from the LMC shows very little correlation with gas density and is rather correlated to tracers of massive star forming regions. The close confinement of gamma-ray emission to star forming regions suggests a relatively short GeV cosmic-ray proton diffusion length. The close correlation between cosmic-ray density and massive star tracers supports the idea that cosmic rays are accelerated in massive star forming regions as a result of the large amounts of kinetic energy that are input by the stellar winds and supernova explosions of massive stars into the interstellar medium.

Abstract Copyright: ∼

Journal keyword(s): acceleration of particles - cosmic rays - Magellanic Clouds - gamma rays: galaxies

Nomenclature: Table 2: [AAA2010] SN (Nos S1-S5). Table 3: [AAA2010] GN (Nos G1-G2).

Simbad objects: 15

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Number of rows : 15
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 Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
2 ICRF J050754.6-610443 Bla 05 07 54.6709064784 -61 04 43.115180556       17.7   ~ 71 1
3 ICRF J051637.7-723707 QSO 05 16 37.71905215 -72 37 07.4656674           ~ 36 1
4 QSO B0516-621 BLL 05 16 44.92617055 -62 07 05.3894029 18.50 18.09 17.85 17.46   ~ 139 1
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 NGC 2032 HII 05 35 23.5 -67 34 56           ~ 75 1
7 PSR J0537-6910 Psr 05 37 46.66 -69 10 17.1           ~ 309 1
8 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
9 PSR B0540-69 Psr 05 40 11.2000490438 -69 19 54.198559829           ~ 976 3
10 RX J0546.9-6851 Bla 05 46 55.20979 -68 51 34.8903           ~ 13 0
11 2FGL J0558.7-7501 BLL 05 58 46.0386222288 -74 59 05.209726560 18.05 17.55 17.26     ~ 56 1
12 ICRF J060111.2-703608 Bla 06 01 11.2488493488 -70 36 08.802829692           ~ 117 2
13 QSO J0635-7516 Bla 06 35 46.5079301472 -75 16 16.816418256   15.96 15.75 15.82   ~ 625 1
14 2MASS J07003124-6610452 BLL 07 00 31.2536435688 -66 10 45.229749384 16.38 15.99 15.89     ~ 86 3
15 NAME Local Group GrG ~ ~           ~ 9325 0

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