English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/2728
Compartir / Impacto:
Add this article to your Mendeley library MendeleyBASE
Citado 31 veces en Web of Knowledge®  |  Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : Cold H2O and CO ice and gas toward the Galactic Center
Autor : Moneti, Andrea; Cernicharo, José ; Pardo Carrión, Juan Ramón
Palabras clave : Infrared: ISM
ISM: abundances
ISM: individual (Sagittarius A*, GCS 3)
ISM: lines and bands
ISM: molecules
Fecha de publicación : 13-dic-2000
Editor: American Astronomical Society
Citación : The Astrophysical Journal Letters. Volume 549, Issue 2, Page L203–L207, Mar 2001
Resumen: We present observations of CO, 13CO and of H2O in the middle and far-infrared taken with the ISO-SWS and ISO-LWS spectrometers toward two positions in the Galactic Center region (Sgr A* and GCS-3). Both ice and gas phase molecules are detected. The ISO data have been complemented with observations of the J=3-2 and J=7-6 lines of CO carried out at the Caltech Submillimeter Observatory. The ISO and CSO data indicate that the absorbing gas is extremely cold, T_K ~ 10 K, suggesting that it is located in the dark clouds of the different spiral arms that intersect the line of sight towards the Galactic Center. From the analysis of the CO absorption we derive 13CO gas phase column densities of 1.1 and 0.7E17 cm-2 towards Sgr A* and GCS-3, respectively. The H2O gas column density in the direction of Sgr A* is ~ 2E16 cm-2. The derived CO/H2O and gas/solid abundance ratios corresponding to these cold clouds are remarkably similar along the two lines of sight. We find that nearly all the CO is in the gas phase, while the H2O is almost entirely frozen onto the surfaces of cold dust grains. Finally, the N_{gas+ice}(CO)/N_{gas+ice}(H2O) abundance ratio is ~5 implying that H2O formation processes are highly efficient.
URI : http://hdl.handle.net/10261/2728
DOI: 10.1086/319168
ISSN: 1538-4357
Aparece en las colecciones: (CFMAC-IEM) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
43.pdf515,84 kBAdobe PDFVista previa
Mostrar el registro completo

NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.