SIMBAD references

2020MNRAS.492..895D - Mon. Not. R. Astron. Soc., 492, 895-914 (2020/February-2)

Ultracompact H II regions with extended emission: the complete view.

DE LA FUENTE E., PORRAS A., TRINIDAD M.A., KURTZ S.E., KEMP S.N., TAFOYA D., FRANCO J. and RODRIGUEZ-RICO C.

Abstract (from CDS):

In this paper, we present the results of a morphological study performed on a sample of 28 ultracompact H II (UC H II) regions located near extended free-free emission, using radio continuum (RC) observations at 3.6 cm 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 H II regions directly connected with the surrounding extended emission (EE). The observed morphology of most of the UC H II 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 24 µm 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).

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: pre-main-sequence - ISM: bubbles - HII regions - radio continuum: ISM

Status at CDS : Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 58

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2021.05.17-12:32:50

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