Dust clouds within globular clusters - Polarization

Details Dust clouds within globular clusters - Polarization Dust clouds within globular clusters - Polarization

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..222f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 222-229. Research supported by CONICET and Universida

Astronomy and Astrophysics

Astrophysics

12

Cosmic Dust, Globular Clusters, Molecular Clouds, Polarized Radiation, Charge Coupled Devices, Light Scattering, Polarimetry, Stellar Winds, Ultraviolet Photometry

Scientific paper

Multicolor polarization and CCD photometry are presented for four dust cloud candidates in the globular clusters NCG 362, 6266, 7078, and 7099. The results are in agreement with previous arguments, suggesting the physical membership of the clouds in the clusters. Tangential polarization is present in the last three objects. The observed polarization, after correction for dilution effects, is consistent with a 'gray' behavior and P about 2-3 percent. Alternatively, the dark patch in NGC 362 shows a polarization similar to that of the cluster nucleus, probably with an interstellar origin. The detection of scattered polarized light at angular distances close to four core radii shows that the dust complexes may be considerably extended.

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