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NGC 4631: The Unusual Star Forming Region Around CM67 — CO Observations with NMA and Pico Veleta

Published online by Cambridge University Press:  12 April 2016

M. Krause ,
G. Golla ,
K.-I. Morita  and
R. Wielebinski
M. Krause
Affiliation:
Max-Planck-Institut fur Radioastronomie, Auf dem Hügel 69, W-5300 Bonn 1, Federal Republic of Germany
G. Golla
Affiliation:
Max-Planck-Institut fur Radioastronomie, Auf dem Hügel 69, W-5300 Bonn 1, Federal Republic of Germany
K.-I. Morita
Affiliation:
Nobeyama Radio Observatory, Nobeyama, Minamisaku, Nagano 384-13, Japan
R. Wielebinski
Affiliation:
Max-Planck-Institut fur Radioastronomie, Auf dem Hügel 69, W-5300 Bonn 1, Federal Republic of Germany

Extract

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The late-type edge-on spiral galaxy NGC 4631 is known for its high star formation rate and extended radio halo with a uniform magnetic field component ordered predominantly perpendicular to the plane of the galaxy in the inner 6 kpc (assuming a distance of 7.5 Mpc, 1′ = 2.2 kpc) (Hummel et al. 1988; Golla, Ph.D., in preparation). The strongest radio continuum source of NGC 4631 is located at the eastern edge of the central region near a giant HII region complex CM67 (Crillon and Monnet 1969). The magnetic field orientation going out from the central region and especially from the region CM67 as well as the prominent north eastern low frequency radio spur (cf. Hummel et al. 1991) indicate a close connection between the synchrotron emission of the radio halo of NGC 4631 and star forming regions/CM67 in the disk (Golla and Hummel, in preparation). Probably cosmic rays from star forming regions in the disk propagate along the magnetic field Unes into the halo.

Type
3. Astronomical Results and Prospects
Information
International Astronomical Union Colloquium , Volume 140: Astronomy with Millimeter and Submillimeter Wave Interferometry , 1994 , pp. 363 - 365
Copyright
Copyright © Astronomical Society of the Pacific 1994

References

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Sofue, Y., Handa, T., Golia, G., Wielebinski, R. 1990, PASP, 42, 745 Google Scholar