K'-band observations of the evil eye galaxy: Are the optical and near-infrared dust albedos identical?

Details K'-band observations of the evil eye galaxy: Are the optical and near-infrared dust albedos identical? K'-band observations of the evil eye galaxy: Are the optical and near-infrared dust albedos identical?

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..227w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 227-231

Astronomy and Astrophysics

Astronomy

23

Cosmic Ray Albedo, Data Processing, Disk Galaxies, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Linear Polarization, Sky Surveys (Astronomy), Absorption, Metallicity, Molecular Gases, Spatial Distribution, Stellar Luminosity, Wavelengths

Scientific paper

New measurements of the reduction of the V-band surface brightness across the prominent dust feature in the galaxy NGC 4826 are compared with corresponding increases in the V-K' color within the context of radiative transfer models invoking both absorption and scattering. The K'-band surface brightness is found to be higher than expected from standard dust models. We interpret the difference as resulting from a high effective dust albedo at K', with a likely value in excess of 0.8, provided the near-IR extinction curve in NGC 4826 is identical to the Galactic one. The high effective albedo may result from scattering by dust with a maximum grain size at least twice as large as assumed by standard models, a conclusion already indirectly hinted at by recent studies of dust star-forming regions and reflection nebulae. At least part of the high effective albedo at K' may result from near-IR nonequilibrium continuum emission attributable to very small grains.

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