Hydrogen and carbon recombination lines towards the Galactic Centre near 328 MHz
- 21 November 1997
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 292 (1) , 63-70
- https://doi.org/10.1093/mnras/292.1.63
Abstract
We present observations of the H271α and the C271α recombination lines from nine positions around the Galactic Centre region made using the Ooty Radio Telescope. Both the lines were detected in emission in all the positions. In the integrated spectrum obtained by averaging over all the nine positions, the H271α line shows a narrow (∼8 km s−1) component superposed on a previously known broad (∼38km s−1 ) component. Further observations are required to confirm the narrow feature. If the narrow component is real, then it could originate in a region with physical properties Te∼100–1200 K, ne∼ 1.0–1.5 cm−3 and EM∼0.1–5.9 pc cm−6. Both the broad and narrow components have similar non-zero LSR velocities, which suggests that the region responsible for the narrow component could be a partially ionized outer envelope of the low-density Hii region in which the broad line originates.Keywords
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