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Study of the region 348°⩽l⩽12°, +3°⩽b⩽+17° in the 21 cm line

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Abstract

The study of the region 348°≤l≤12°, +3°≤b⩽+17° reveals strong kinematic asymmetries of the interstellar gas, with a notorious predominance of positive radial velocities, referred to the LSR. The principal cause of this is a very intense source, a ridge-like object (‘Ridge’) which presents very special characteristics and seems to be identical with Lindblad's feature A. It should, therefore, be related to Gould's Belt. The object's velocity dependence onl is in good agreement with Lindblad's model. It can be easily followed into high northern latitudes and also into low southern latitudes, as well as into values ofl remarkably lower and higher than those considered in this work. It seems also highly probable that feature A presents both the cold as well as the hot component of the interstellar medium. In that case, the mean optical depth and the mean spin temperature of the cold component would be\(\bar \tau = 0.8\) and\(\bar T_s = 72\) K in the region considered here.

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Authors and Affiliations

  1. Instituto Argentino de Radioastronomía, Casilla de Correo 5, Villa Elisa, Buenos Aires, Argentina

    M. L. Franco (Fellow of the Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CIC) & W. G. L. Pöppel (Member of the Carrera del Investigador Cientifico)

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  1. M. L. Franco
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  2. W. G. L. Pöppel
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Consejo Nacional de Investigaciones Científicas y Técnicas de Argentina (CONICET).

The Instituto operates under an agreement between the CONICET, the CIC and the Universities of Buenos Aires and La Plata, and with the support of the Carnegie Institution of Washington.

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Franco, M.L., Pöppel, W.G.L. Study of the region 348°⩽l⩽12°, +3°⩽b⩽+17° in the 21 cm line. Astrophys Space Sci 53, 91–103 (1978). https://doi.org/10.1007/BF00645907

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  • DOI: https://doi.org/10.1007/BF00645907

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