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1988•Monthly Notices of the Royal Astronomical SocietyOpen access

Millimetre-wave continuum observations of the Galactic Centre

Chris J. Salter, R. P. Sinha, Elizabeth B. Stobie, Frank J. Kerr, R. W. Hobbs

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Abstract

We present millimetre-wave continuum maps of Sgr A at 230 GHz and of a wider region around the Galactic Centre at 84 GHz. We use the latter to investigate the distribution of spectral index between 10.7 and 84 GHz for Sgr A and the filamentary Bridge and Arc features. A flat spectrum ‘spur’ of emission is found, aligned with the Sgr A West source. It crosses the non-thermal Sgr A halo and appears to represent the continuation of one of the ‘threads’ of Morris & Yusef-Zadeh. An 84-GHz feature to the south of Sgr A probably represents the very long wavelength emission from cold dust in the molecular cloud M-0.13-0.08.

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What this paper is about

We present millimetre-wave continuum maps of Sgr A at 230 GHz and of a wider region around the Galactic Centre at 84 GHz. We use the latter to investigate the distribution of spectral index between 10.7 and 84 GHz for Sgr A and the filamentary Bridge and Arc features. A flat spectrum ‘spur’ of emission is found, aligned with the Sgr A West source. It crosses the non-thermal Sgr A halo and appears to represent the continuation of one of the ‘threads’ of Morris & Yusef-Zadeh. An 84-GHz feature to the south of Sgr A probably represents the very long wavelength emission from cold dust in the molecular cloud M-0.13-0.08.

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Available abstract

We present millimetre-wave continuum maps of Sgr A at 230 GHz and of a wider region around the Galactic Centre at 84 GHz. We use the latter to investigate the distribution of spectral index between 10.7 and 84 GHz for Sgr A and the filamentary Bridge and Arc features. A flat spectrum ‘spur’ of emission is found, aligned with the Sgr A West source. It crosses the non-thermal Sgr A halo and appears to represent the continuation of one of the ‘threads’ of Morris & Yusef-Zadeh. An 84-GHz feature to the south of Sgr A probably represents the very long wavelength emission from cold dust in the molecular cloud M-0.13-0.08.

Key concepts: Physics, Astrophysics, Spectral index, Halo, Millimeter, Wavelength, Molecular cloud, Thermal emission

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