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Título: Ultracompact H II regions with extended emission: the complete view
Autor: 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
ID del Autor: 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
Resumen: 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).
Fecha de publicación: 18-dic-2019
Editorial: Royal Astronomical Society
Licencia: http://creativecommons.org/licenses/by-nc-nd/4.0
URI: http://repositorio.ugto.mx/handle/20.500.12059/11818
Idioma: eng
Aparece en las colecciones:WoS - Ciencias Físicas

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