High-resolution CO observations towards the bright eastern knot of the SNR Puppis A

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Aims.This paper reports molecular observations towards the bright eastern knot (BEK) in the SNR Puppis A, a feature where radio and X-ray studies suggest that the shock front is interacting with a dense molecular clump.Methods.We performed high-resolution millimetric observations towards the BEK of...

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Autores principales: Paron, S., Dubner, G., Reynoso, E., Rubio, M.
Formato: JOUR
Materias:
ISM: clouds
ISM: molecules
ISM: supernova remnants
Data reduction
Radio astronomy
Signal to noise ratio
Space telescopes
Carbon monoxide
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00046361_v480_n2_p439_Paron
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00046361_v480_n2_p439_Paron
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spelling todo:paper_00046361_v480_n2_p439_Paron2023-10-03T14:00:22Z High-resolution CO observations towards the bright eastern knot of the SNR Puppis A Paron, S. Dubner, G. Reynoso, E. Rubio, M. ISM: clouds ISM: molecules ISM: supernova remnants Data reduction Radio astronomy Signal to noise ratio Space telescopes ISM: clouds ISM: molecules ISM: supernova remnants Carbon monoxide Aims.This paper reports molecular observations towards the bright eastern knot (BEK) in the SNR Puppis A, a feature where radio and X-ray studies suggest that the shock front is interacting with a dense molecular clump.Methods.We performed high-resolution millimetric observations towards the BEK of Puppis A using the SEST telescope in the CO -0 and 2-1 lines (beams of 45 and 23, respectively). More extended, lower angular resolution CO -0 observations taken from NANTEN archival data were also analyzed to obtain a complete picture.Results. In the velocity range near 16 km s-1, which is the Puppis A systemic velocity, our study revealed two important properties: (i) no dense molecular gas is detected immediately adjacent to the eastern border of the BEK and (ii) the molecular clump detected very close to the radiocontinuum maximum is probably located in the foreground along the line of sight and has not yet been reached by the SNR shock front. We propose two possible scenarios for explaining the absence of molecular emission eastwards of the BEK border of Puppis A. Either the shock front has completely engulfed and destroyed a molecular clump or the shock front is interacting with part of a larger cloud, and we do not detect CO emission immediately beyond it because the molecules have been dissociated by photodissociation and by reactions with photoionized material due to the radiative precursor. © 2008 ESO. Fil:Paron, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Dubner, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Reynoso, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v480_n2_p439_Paron
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic ISM: clouds
ISM: molecules
ISM: supernova remnants
Data reduction
Radio astronomy
Signal to noise ratio
Space telescopes
ISM: clouds
ISM: molecules
ISM: supernova remnants
Carbon monoxide
spellingShingle ISM: clouds
ISM: molecules
ISM: supernova remnants
Data reduction
Radio astronomy
Signal to noise ratio
Space telescopes
ISM: clouds
ISM: molecules
ISM: supernova remnants
Carbon monoxide
Paron, S.
Dubner, G.
Reynoso, E.
Rubio, M.
High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
topic_facet ISM: clouds
ISM: molecules
ISM: supernova remnants
Data reduction
Radio astronomy
Signal to noise ratio
Space telescopes
ISM: clouds
ISM: molecules
ISM: supernova remnants
Carbon monoxide
description Aims.This paper reports molecular observations towards the bright eastern knot (BEK) in the SNR Puppis A, a feature where radio and X-ray studies suggest that the shock front is interacting with a dense molecular clump.Methods.We performed high-resolution millimetric observations towards the BEK of Puppis A using the SEST telescope in the CO -0 and 2-1 lines (beams of 45 and 23, respectively). More extended, lower angular resolution CO -0 observations taken from NANTEN archival data were also analyzed to obtain a complete picture.Results. In the velocity range near 16 km s-1, which is the Puppis A systemic velocity, our study revealed two important properties: (i) no dense molecular gas is detected immediately adjacent to the eastern border of the BEK and (ii) the molecular clump detected very close to the radiocontinuum maximum is probably located in the foreground along the line of sight and has not yet been reached by the SNR shock front. We propose two possible scenarios for explaining the absence of molecular emission eastwards of the BEK border of Puppis A. Either the shock front has completely engulfed and destroyed a molecular clump or the shock front is interacting with part of a larger cloud, and we do not detect CO emission immediately beyond it because the molecules have been dissociated by photodissociation and by reactions with photoionized material due to the radiative precursor. © 2008 ESO.
format JOUR
author Paron, S.
Dubner, G.
Reynoso, E.
Rubio, M.
author_facet Paron, S.
Dubner, G.
Reynoso, E.
Rubio, M.
author_sort Paron, S.
title High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
title_short High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
title_full High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
title_fullStr High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
title_full_unstemmed High-resolution CO observations towards the bright eastern knot of the SNR Puppis A
title_sort high-resolution co observations towards the bright eastern knot of the snr puppis a
url http://hdl.handle.net/20.500.12110/paper_00046361_v480_n2_p439_Paron
work_keys_str_mv AT parons highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
AT dubnerg highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
AT reynosoe highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
AT rubiom highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
_version_ 1807318096800645120

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