The anomalous arms of the spiral galaxy NGC 4258

Details The anomalous arms of the spiral galaxy NGC 4258 The anomalous arms of the spiral galaxy NGC 4258

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97...32r&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, Jan. 1985, p. 32-36. Research supported by the Mini

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, Galactic Structure, Late Stars, Optical Emission Spectroscopy, Spiral Galaxies, Fabry-Perot Spectrometers, H Alpha Line, Nonthermal Radiation, Optical Polarization

Scientific paper

The nature of the optical emission of the southern "anomalous arms" of the spiral galaxy NGC 4258 is investigated. High-resolution spectral scans at Hα have been obtained with a Fabry-Pérot spectrometer. No spectral line was detected, indicating that the emission of these arms is probably mostly continuum. A search for high optical polarization with polarizing filters and a photon-counting camera resulted in an upper polarization limit of 5% (1 σ), eliminating synchrotron radiation as an important contribution to the optical emission of the arms. It remains to be established whether the optical anomalous arms are made of late-type stars or perhaps emitters of nonthermal continuum.

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