Open AccessRocket Observations of Far‐Ultraviolet Dust Scattering in NGC 2023
Author(s) -
Eric B. Burgh,
Stephan R. McCandliss,
P. D. Feldman
Publication year - 2002
Publication title -
the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/341194
Subject(s) - physics , reflection nebula , extinction (optical mineralogy) , scattering , wavelength , phase function , astrophysics , albedo (alchemy) , absorption (acoustics) , astronomy , spectrograph , optics , cosmic dust , far ultraviolet , spectral line , nebula , stars , art , performance art , art history
The reflection nebula NGC 2023 was observed by a rocket-borne long-slitimaging spectrograph in the 900 -- 1400 Angstrom bandpass on 2000 February 11.A spectrum of the star, as well as that of the nebular scattered light, wasrecorded. Through the use of a Monte Carlo modeling process, the scatteringproperties of the dust were derived. The albedo is low, 0.2 -- 0.4, anddecreasing toward shorter wavelengths, while the phase function asymmetryparameter is consistent with highly forward-scattering grains, g~0.85. Thedecrease in albedo, while the optical depth increases to shorter wavelengths,implies that the far-UV rise in the extinction curve is due to an increase inabsorption efficiency.Comment: 16 pages, 11 figures, accepted for publication in the Astrophysical Journa
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom