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Advances in Astronomy
Volume 2014, Article ID 192513, 5 pages
Research Article

HCO+ and Radio Continuum Emission from the Star Forming Region G75.78+0.34

Departamento de Física, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil

Received 30 September 2013; Accepted 4 December 2013; Published 22 January 2014

Academic Editor: William Reach

Copyright © 2014 Rogemar A. Riffel and Everton Lüdke. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We present 1.3 and 3.6 cm radio continuum images and a HCO+ spectrum of the massive star forming region G75.78+0.34 obtained with the Very Large Array (VLA) and with the Berkley Illinois Maryland Association (BIMA) interferometer. Three structures were detected in the continuum emission: one associated with the well-known cometary H ɪɪ region, plus two more compact structures located at 6′′ east and at 2′′ south of cometary H ɪɪ region. Using the total flux and intensity peak we estimated an electron density of 1.5 × 104 cm−3, an emission measure of 6 × 107 cm−6 pc, a mass of ionized gas of 3 M, and a diameter of 0.05 pc for the cometary H ɪɪ region, being typical values for an ultracompact H ɪɪ region. The HCO+ emission probably originates from the molecular outflows previously observed in HCN and CO.