18-cm VLA observations of OH towards the Galactic Centre

Autor:	Aage Sandqvist, John B. Whiteoak, Roland Karlsson, Loránt O. Sjouwerman
Rok vydání:	2003
Předmět:	Physics Very large array Astronomi astrofysik och kosmologi Space and Planetary Science law Astronomy Astrophysics and Cosmology Astronomy Astronomy and Astrophysics Astrophysics Maser Absorption (electromagnetic radiation) Ground state law.invention
Zdroj:	Astronomy & Astrophysics. 403:1011-1021
ISSN:	1432-0746 0004-6361
Popis:	The OH distribution in the Sgr A Complex has been observed in the 1612-, 1665-, 1667- and 1720-MHz OH transitions with the Very Large Array (VLA) in BnA configuration. Maps are presented with a channel velocity resolution of about 9 km s -1 and with angular resolutions of . Some clear results are highlighted here, such as absorption from the Circumnuclear Disk (CND) and the OH-Streamer inside the CND near Sgr , strong absorption towards most of the eastern and western parts of the Sgr A East shell, lack of absorption towards both Sgr A West and the compact H II-regions to the east of Sgr A East, and double-lobed structure of the High Negative Velocity Gas (HNVG) oriented northeast and southwest of Sgr , and finally compact, point-like maser emission in all four transitions, in particular a 1720-MHz maser at -132 km s -1 in the CND as counterpart to a 1720-MHz maser at +132 km s -1 in the CND.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e7ed6c9a5073a52eb93cdd5e829f9dd4 https://doi.org/10.1051/0004-6361:20030309 Zobrazit plný text záznamu