About
Contact
Help
Sending publications
How to publish
Advanced Search
View Item 
  •   Home
  • Facultad de Ciencias Físicas y Matemáticas
  • Artículos de revistas
  • View Item
  •   Home
  • Facultad de Ciencias Físicas y Matemáticas
  • Artículos de revistas
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Browse byCommunities and CollectionsDateAuthorsTitlesSubjectsThis CollectionDateAuthorsTitlesSubjects

My Account

Login to my accountRegister
Biblioteca Digital - Universidad de Chile
Revistas Chilenas
Repositorios Latinoamericanos
Tesis LatinoAmericanas
Tesis chilenas
Related linksRegistry of Open Access RepositoriesOpenDOARGoogle scholarCOREBASE
My Account
Login to my accountRegister

CO and CS in the Magellanic Clouds: ax(2)-analysis of multitransitional data based on the MEP radiative transfer model

Artículo
Thumbnail
Open/Download
file_5325.txt (0bytes)
Publication date
2007
Metadata
Show full item record
Cómo citar
Nikolic, Silvana
Cómo citar
CO and CS in the Magellanic Clouds: ax(2)-analysis of multitransitional data based on the MEP radiative transfer model
.
Copiar
Cerrar

Author
  • Nikolic, Silvana;
  • Garay Brignardello, Guido;
  • Rubio López, Mónica;
  • Johansson, L. E. B.;
Abstract
Aims. Our goal is to determine the physical properties of molecular gas located in different environments of the SMC-from near the vicinity of hot HII regions to cold, quiescent clouds - via modelling and simulations, and compare with the properties of molecular gas found in similar environments in the LMC. Methods. We present observations of the (CO)-C-12(1-0), (2-1), (3-2), (CO)-C-13(1-0), (2-1), and CS (2-1), (3-2) line emission toward six molecular clouds in the SMC: N66, N88, Lirs 36, Lirs 49, Hodge 15, and SMC- B1# 1. These data, as well as published data on three clouds of the LMC: 30Dor- 10, N 159- W, and N159- S, are analysed to estimate gas kinetic temperatures, column densities, and surface filling factors using a Mean Escape Probability approximation of the radiative transfer equations. The solutions are restricted using the chi(2) approach. Results. Assuming that the [(CO)-C-12/(CO)-C-13] abundance ratio is similar in both galaxies, we find that the CO and CS column densities of SMC clouds are a magnitude smaller than those of LMC clouds, mirroring the metallicity differences. Our analysis suggests the existence of a lower limit for the (CO)-C-12/ (CO)-C-13 isotope ratio of 50 in both galaxies. The surface filling factors of the CO emission in the SMC clouds are a factor of a few smaller than in the LMC and seem to decrease with increasing UV radiation fields, i. e., more vigorous star formation activity. A simple model, which assumes a spherical cloud with uniform physical parameters immersed in the CMB radiation field, provides a reasonably good fit to the observed properties of the ( supposedly) quiescent clouds SMC- B1# 1 and N159- S. For all other clouds considered, this model gives large values of chi(2), strongly indicating the need for a more complex model. We present some results from 2- component modelling, e. g., for Lirs 36 a mixture of 20 K gas with high optical depth and a less dense gas with temperatures of 100 K reproduces well the main features of the CO data.
General note
Publicación ISI
Identifier
URI: https://repositorio.uchile.cl/handle/2250/124713
Quote Item
ASTRONOMY & ASTROPHYSICS Vol. 471 AUG 2007 2 561-571
Collections
  • Artículos de revistas
xmlui.footer.title
31 participating institutions
More than 73,000 publications
More than 110,000 topics
More than 75,000 authors
Published in the repository
  • How to publish
  • Definitions
  • Copyright
  • Frequent questions
Documents
  • Dating Guide
  • Thesis authorization
  • Document authorization
  • How to prepare a thesis (PDF)
Services
  • Digital library
  • Chilean academic journals portal
  • Latin American Repository Network
  • Latin American theses
  • Chilean theses
Dirección de Servicios de Información y Bibliotecas (SISIB)
Universidad de Chile

© 2020 DSpace
  • Access my account