2014A&A...571A..96A

Query : 2014A&A...571A..96A

2014A&A...571A..96A - Astronomy and Astrophysics, volume 571A96-96 (2014/11-1)

MAGIC reveals a complex morphology within the unidentified gamma-ray source HESS J1857+026.

ALEKSIC J., ANSOLDI S., ANTONELLI L.A., ANTORANZ P., BABIC A., BANGALE P., BARRES DE ALMEIDA U., BARRIO J.A., BECERRA GONZALEZ J., BEDNAREK W., BERNARDINI E., BILAND A., BLANCH O., BONNEFOY S., BONNOLI G., BORRACCI F., BRETZ T., CARMONA E., CAROSI A., CARRETO FIDALGO D., COLIN P., COLOMBO E., CONTRERAS J.L., CORTINA J., COVINO S., DA VELA P., DAZZI F., DE ANGELIS A., DE CANEVA G., DE LOTTO B., DELGADO MENDEZ C., DOERT M., DOMINGUEZ A., DOMINIS PRESTER D., DORNER D., DORO M., EINECKE S., EISENACHER D., ELSAESSER D., FARINA E., FERENC D., FONSECA M.V., FONT L., FRANTZEN K., FRUCK C., GARCIA LOPEZ R.J., GARCZARCZYK M., GARRIDO TERRATS D., GAUG M., GODINOVIC N., GONZALEZ MUNOZ A., GOZZINI S.R., HADASCH D., HAYASHIDA M., HERRERA J., HERRERO A., HILDEBRAND D., HOSE J., HRUPEC D., IDEC W., KADENIUS V., KELLERMANN H., KLEPSER S., KODANI K., KONNO Y., KRAUSE J., KUBO H., KUSHIDA J., LA BARBERA A., LELAS D., LEWANDOWSKA N., LINDFORS E., LOMBARDI S., LOPEZ M., LOPEZ-COTO R., LOPEZ-ORAMAS A., LORENZ E., LOZANO I., MAKARIEV M., MALLOT K., MANEVA G., MANKUZHIYIL N., MANNHEIM K., MARASCHI L., MARCOTE B., MARIOTTI M., MARTINEZ M., MAZIN D., MENZEL U., MEUCCI M., MIRANDA J.M., MIRZOYAN R., MORALEJO A., MUNAR-ADROVER P., NAKAJIMA D., NIEDZWIECKI A., NILSSON K., NISHIJIMA K., NODA K., NOWAK N., DE ONA WILHELMI E., ORITO R., OVERKEMPING A., PAIANO S., PALATIELLO M., PANEQUE D., PAOLETTI R., PAREDES J.M., PAREDES-FORTUNY X., PARTINI S., PERSIC M., PRADA F., PRADA MORONI P.G., PRANDINI E., PREZIUSO S., PULJAK I., REINTHAL R., RHODE W., RIBO M., RICO J., RODRIGUEZ GARCIA J., RUEGAMER S., SAGGION A., SAITO T., SAITO K., SATALECKA K., SCALZOTTO V., SCAPIN V., SCHULTZ C., SCHWEIZER T., SHORE S.N., SILLANPAEAE A., SITAREK J., SNIDARIC I., SOBCZYNSKA D., SPANIER F., STAMATESCU V., STAMERRA A., STEINBRING T., STORZ J., STRZYS M., SUN S., SURIC T., TAKALO L., TAKAMI H., TAVECCHIO F., TEMNIKOV P., TERZIC T., TESCARO D., TESHIMA M., THAELE J., TIBOLLA O., TORRES D.F., TOYAMA T., TREVES A., UELLENBECK M., VOGLER P., WAGNER R.M., ZANDANEL F. and ZANIN R.

Abstract (from CDS):

HESS J1857+026 is an extended TeV gamma-ray source that was discovered by H.E.S.S. as part of its Galactic plane survey. Given its broadband spectral energy distribution and its spatial coincidence with the young energetic pulsar PSR J1856+0245, the source has been put forward as a pulsar wind nebula (PWN) candidate. MAGIC has performed follow-up observations aimed at mapping the source down to energies approaching 100GeV in order to better understand its complex morphology. HESS J1857+026 was observed by MAGIC in 2010, yielding 29h of good quality stereoscopic data that allowed us to map the source region in two separate ranges of energy. We detected very-high-energy gamma-ray emission from HESS J1857+026 with a significance of 12 σ above 150GeV. The differential energy spectrum between 100GeV and 13 TeV is described well by a power law function dN/dE=N0(E/1TeV)–Γ with N0=(5.37±0.44stat±1.5sys)x10–12(1/TeV/cm2/s) and Γ= 2.16±0.07stat ±0.15sys, which bridges the gap between theGeV emission measured by Fermi-LAT and the multi-TeV emission measured by H.E.S.S.. In addition, we present a detailed analysis of the energy-dependent morphology of this region. We couple these results with archival multiwavelength data and outline evidence in favor of a two-source scenario, whereby one source is associated with a PWN, while the other could be linked with a molecular cloud complex containing an Hii region and a possible gas cavity.

Abstract Copyright: ∼

Journal keyword(s): acceleration of particles - gamma rays: ISM - ISM: clouds - HII regions - ISM: individual objects: HESS J1857+026 - pulsars: individual: PSR J1856+0245

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 HESS J1708-443 gam 17 07 59.53847 -44 17 19.0460           ~ 17 0
2 SNR G343.1-02.3 SNR 17 08.0 -44 16           ~ 82 1
3 PSR B1706-44 Psr 17 09 42.62000 -44 29 12.0000     13.30     ~ 670 1
4 NAME Fermi-LAT J1857+027 gam 18 56 50.80 +02 45 50.2           ~ 2 0
5 PSR J1856+0245 Psr 18 56 50.80 +02 45 50.2           ~ 51 0
6 4FGL J1857.7+0246e Psr 18 57 11.0 +02 40 00           ~ 59 0
7 MAGIC J1857+026 Psr 18 57.2 +02 38           ~ 9 0
8 HRDS G036.347+00.048 HII 18 57 30.0 +03 03 39           ~ 2 0
9 MAGIC J1857+029 gam 18 57.6 +02 58           ~ 11 0
10 MSX6C G036.4057+00.0230 Y*O 18 57 41.9 +03 06 06           ~ 5 1
11 [ABJ2009] U36.40+0.02 MoC 18 57 42 +03 05.7           ~ 4 0
12 IRAS 18551+0302 bub 18 57 42.1 +03 06 04           ~ 21 1
13 GRSMC 36.59-0.06 MoC 18 58.3 +03 14           ~ 1 0
14 HESS J1858+020 gam 18 58 20.0 +02 05 24           ~ 45 0
15 GRSMC 36.49-0.16 MoC 18 58.5 +03 06           ~ 1 0
16 [ABJ2009] C36.46-0.18 MoC 18 58 31 +03 03.5           ~ 4 0
17 GRSMC 36.74-0.16 MoC 18 59.0 +03 19           ~ 1 0

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