Radio continuum and radio recombination line observations of Sagittarius B1 and G0.6-0.0

• Published in: The Astrophysical journal Vol. 401; no. 1; pp. 168 - 181
• Main Authors: Mehringer, David M., Yusef-Zadeh, F., Palmer, Patrick, Goss, W. M.
• Format: Journal Article
• Language: English
• Published: Legacy CDMS University of Chicago Press 10.12.1992
• Subjects: Astronomy; Astrophysics; Earth, ocean, space; Exact sciences and technology; H ii regions. Emission and reflection nebulae; Interstellar medium (ism) and nebulae in milky way; Stellar systems. Galactic and extragalactic objects and systems. The universe; High resolution; Hα line; Ionized gas; VLA observation; Stellar formation region; Galactic center; Centimetric wave; Radio interferometric observation; Continuum; Radio recombination line; Radio map; Dynamics; Galactic nucleus; Spectral line profile; H II region; Kinematics; Interstellar matter
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/172050

Continuum emission and H110-alpha recombination line emission from Sgr B1 and G0.6-0.0 have been observed using the VLA. It is shown that Sgr B1 is a region of great complexity, both spatially and kinematically. The continuum observations show that this region is dominated by many extended features rather than compact sources. On the other hand, Sgr B2 is dominated by several ultracompact H II regions. The two regions may be in different stages of evolution, with Sgr B1 being older, perhaps by as much as 0 exp 6 yrs. The recombination line study shows that Sgr B1 is composed of two distinct kinematic regions, a simple western one and a more complex eastern one. G0.6-0.0 is a region composed of at least four ultracompact H II regions that is situated between Sgr B1 and Sgr B2. There is an arc of ionized gas that lies to the east and to the south of these compact regions. The velocity of G0.6-0.0 is intermediate between those of Sgr B1 and Sgr B2. These facts strengthen the argument that these regions are physically associated.