High-resolution 1-2 micron imaging polarimetry of W75N

Details High-resolution 1-2 micron imaging polarimetry of W75N High-resolution 1-2 micron imaging polarimetry of W75N

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..377m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 377-388.

Astronomy and Astrophysics

Astronomy

24

Infrared Astronomy, Near Infrared Radiation, Polarimetry, Reflection Nebulae, Star Formation, Brightness Distribution, High Resolution, Infrared Astronomy Satellite, Light Scattering, Seeing (Astronomy), Spatial Resolution

Scientific paper

Seeing-limited polarimetry of the star-forming region W75N(OH) shows two separate infrared-reflection nebulae. The bright 2-micron peak IRS-1 is found to be part of the larger nebula and is not a self-luminous object. The asymmetric appearance of this nebula, as of other outflow-related infrared-reflection nebulae in which the lobe directed away from the observer often appears heavily suppressed, may be due to large grains in a narrow size range dominating scattering in the near-infrared. A linear pattern of polarization vectors close to the source of the CO outflow is similar to that seen in other young sources, which may be evidence of dense disc structures around the illuminating source, but might also arise from multiple scattering in stratified-density geometries that are not disc-like. The smaller reflection-nebula around IRS-2 is symmetrically bipolar and appears to be oriented with its axis in the plane of the sky; its presence indicates that IRS-2 generates a small-scale, lightly collimated outflow of its own. Thirty-nine new low-luminosity sources have been detected at 2.2 microns within a 1.2 arcmin sq region. The K luminosity function of these sources is consistent with that of a single cluster of young stars, showing no significant differences from the distribution found in the Orion cluster.

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