A deep λ20 cm radio continuum survey of M 31
| Autor: | E. M. Berkhuijsen, P. Hoernes, R. Beck |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Physics
Spiral galaxy Andromeda Galaxy Linear polarization Star formation Astrophysics::High Energy Astrophysical Phenomena General Physics and Astronomy Astronomy Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Polarization (waves) Lambda law.invention Telescope Wavelength law Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy and Astrophysics Supplement Series. 129:329-336 |
| ISSN: | 1286-4846 0365-0138 |
| DOI: | 10.1051/aas:1998187 |
| Popis: | We present a survey of the total and linearly polarized radio continuum emission of the Andromeda galaxy at 20 cm wavelength with the VLA-D array. 7 elds were observed with 45 00 angular resolution. The miss- ing large-scale total emission observed with the Eelsberg telescope was inserted. This survey is the most sensitive radio continuum survey of M 31 so far and the rst one in linear polarization with the VLA. The total emission of M 31 comes from extended re- gions and point sources. Both components are concen- trated in the bright \ring" of maximum star formation at about 10 kpc radius. Nearly half of the extended emis- sion emerges from numerous lamentary features which are typically a few arcminutes long (' 600 pc). In the eld of M 31, 36 linearly polarized background sources were detected. The smallest degrees of polarization occur on the cen- tre of the \ring" where the total emission is highest, hence on the spiral arms as delineated by H emission and OB associations. The distribution of polarization angles re- veals coherent features of typically 1 kpc in extent, some of which show a relation to an OB association. |
| Databáze: | OpenAIRE |
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