IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
The molecular clump towards the eastern border of SNR G18.8+0.3
Autor/es:
PARON, S.; ORTEGA, M.; PETRIELLA, A.; RUBIO, MÓNICA; DUBNER, G.; GIACANI, E.
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2012 vol. 547 p. 60 - 67
ISSN:
0004-6361
Resumen:
Aims: The eastern border of the SNR G18.8+0.3, close to an HII
regions complex, is a very interesting region for studying the molecular
gas that it is probably in contact with the supernova remnant (SNR)
shock front. Methods: We observed this region using the Atacama
Submillimeter Telescope Experiment (ASTE) in the 12CO J =
3-2, 13CO J = 3-2, HCO + J = 4-3, and CS J = 7-6
lines with an angular resolution of 22''. To complement these
observations, we analyzed infrared, submillimeter, and radio continuum
archival data. Results: In this work, we clearly show that the
radio continuum "protrusion" that was earlier thought to belong to the
SNR is an HII region complex that is deeply embedded in a molecular
clump. The new molecular observations reveal that this dense clump,
belonging to an extended molecular cloud that surrounds the SNR's
southeast border, is not physically in contact with SNR G18.8+0.3,
suggesting that the SNR shock front has not yet reached it or that they
may be located at different distances. We found some young stellar
objects embedded in the molecular clump, suggesting that their formation
should be approximately coeval with the SN explosion.