IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
A new study of the SNR G344.7-0.1 located in the vicinity of the undientified TeV source HESS J1702-420
Autor/es:
GIACANI, E.; SMITH, M.J.S.; DUBNER, G.; LOISEAU, N.
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Año: 2011
ISSN:
0004-6361
Resumen:
CONTEXT: The identification of counterparts of dark very-high energy (VHE) sources adds greatly to our understanding of their underlyingastrophysical processes.AIM: We investigate the physical properties of the supernova remnant (SNR) G344.7-0.1, located in the vicinity of the gamma-ray source HESS J1702-42, aiming to clarify (1) the nature of its central bright radio emission , and (2) the possible physical relationship between the SNR and the VHE source.METHODS: The research  was carried out with new high-resolutionradio images produced from archival ATCA and VLA data in combination with X-ray archival XMM-Newton data.The interstellar medium was investigated in HI, CO and mid IR (24 microns) with data extracted from the public SGPS, CfA CO and MIPSGAL surveys, respectively.RESULTS: Based on the radio images and the comparison with X-ray and IR observations, we confirm that the bright central nebula highlights sites where the SN blast wave is encountering a densewall or cloud. No indication of a radio counterpart is  found forthe X-ray object CXOU J170357.8-414302 within the SNR. The X-ray radiationcompletely fills in the interior of the SNR, being thermalin nature and originating in heated ejecta.  From the spectral analysis itis inferred that G344.7$-$0.1 is the result of a core-collapse SN that exploded about 3000 yrs ago. On thebasis of HI absorption and emission we determined its distance to be (6.3+- 0.1) kpc.From the study of the surrounding gas, we conclude that G344.7-0.1 has evolved within an HI bubblecreated by the SN precursor. This bubble is, in turn, part of a larger HI/IR ring created by the stellar wind of a prior-generation star or stars,about 2.6 x 10^6 yrsago. A second generation of stars formed in this compressed gas and about 3000 yrs ago one of these stars exploded, creating the SNR G344.7-0.1. The interaction of the SNR shock with dense molecular clumps might be the origin of HESS J1702-420.