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http://repositorio.ugto.mx/handle/20.500.12059/11818
Title: | Ultracompact H II regions with extended emission: the complete view |
Authors: | EDUARDO DE LA FUENTE ACOSTA B. Alicia Porras Juárez MIGUEL ANGEL TRINIDAD HERNANDEZ STANLEY EUGENE KURTZ SMITH SIMON NICHOLAS KEMP DANIEL TAFOYA MARTINEZ JOSE DE JESUS FRANCO LOPEZ CARLOS ALANIAS RODRIGUEZ RICO |
Authors' IDs: | info:eu-repo/dai/mx/cvu/36441 info:eu-repo/dai/mx/cvu/19313 info:eu-repo/dai/mx/cvu/121860 info:eu-repo/dai/mx/cvu/15269 info:eu-repo/dai/mx/cvu/22341 info:eu-repo/dai/mx/cvu/45134 info:eu-repo/dai/mx/cvu/1360 info:eu-repo/dai/mx/cvu/36596 |
Abstract: | In this paper, we present the results of a morphological study performed on a sample of 28 ultracompact HII (UC HII) regions located near extended free–free emission, using radio continuum (RC) observations at 3.6cm with the C and D Very Large Array (VLA) configurations, with the aim of determining a direct connection between them. By using previously published observations in B and D VLA configurations, we compiled a final catalogue of 21 UC HII regions directly connected with the surrounding extended emission (EE). The observed morphology of most of the UC HII regions in RC emission is irregular (single- or multipeaked sources) and resembles a classical bubble structure in the Galactic plane with well-defined cometary arcs. RC images superimposed on colour composite Spitzer images reinforce the assignations of direct connection by the spatial coincidence between the UC components and regions of saturated 24μm emission. We also find that the presence of EE may be crucial to understand the observed infrared excess because an underestimation of ionizing Lyman photons was considered in previous works (e.g. Wood & Churchwell; Kurtz, Churchwell & Wood). |
Issue Date: | 18-Dec-2019 |
Publisher: | Royal Astronomical Society |
License: | http://creativecommons.org/licenses/by-nc-nd/4.0 |
URI: | http://repositorio.ugto.mx/handle/20.500.12059/11818 |
Language: | eng |
Appears in Collections: | WoS - Ciencias Físicas |
Files in This Item:
File | Description | Size | Format | |
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stz3482.pdf | 16.78 MB | Adobe PDF | View/Open |
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