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

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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Detalles Bibliográficos
Autores principales: Paron, Sergio Ariel, Dubner, Gloria Mabel, Reynoso, Estela Marta
Publicado: 2008
Materias:
ISM: clouds
ISM: molecules
ISM: supernova remnants
Data reduction
Radio astronomy
Signal to noise ratio
Space telescopes
Carbon monoxide
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v480_n2_p439_Paron
http://hdl.handle.net/20.500.12110/paper_00046361_v480_n2_p439_Paron
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00046361_v480_n2_p439_Paron
record_format dspace
spelling paper:paper_00046361_v480_n2_p439_Paron2023-06-08T14:27:46Z High-resolution CO observations towards the bright eastern knot of the SNR Puppis A Paron, Sergio Ariel Dubner, Gloria Mabel Reynoso, Estela Marta 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. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v480_n2_p439_Paron 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, Sergio Ariel
Dubner, Gloria Mabel
Reynoso, Estela Marta
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.
author Paron, Sergio Ariel
Dubner, Gloria Mabel
Reynoso, Estela Marta
author_facet Paron, Sergio Ariel
Dubner, Gloria Mabel
Reynoso, Estela Marta
author_sort Paron, Sergio Ariel
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
publishDate 2008
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v480_n2_p439_Paron
http://hdl.handle.net/20.500.12110/paper_00046361_v480_n2_p439_Paron
work_keys_str_mv AT paronsergioariel highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
AT dubnergloriamabel highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
AT reynosoestelamarta highresolutioncoobservationstowardsthebrighteasternknotofthesnrpuppisa
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