A New Measurement of the Average Far‐Ultraviolet Extinction Curve

2002 ◽  
Vol 566 (1) ◽  
pp. 267-275 ◽  
Author(s):  
T. P. Sasseen ◽  
M. Hurwitz ◽  
W. V. Dixon ◽  
S. Airieau
Keyword(s):  
Extinction Curve ◽  
Ultraviolet Extinction ◽  
Far Ultraviolet

FUSEMeasurements of Far‐Ultraviolet Extinction. II. Magellanic Cloud Sight Lines

2005 ◽  
Vol 630 (1) ◽  
pp. 355-367 ◽  
Author(s):  
Stefan I. B. Cartledge ◽  
Geoffrey C. Clayton ◽  
Karl D. Gordon ◽  
Brian L. Rachford ◽  
B. T. Draine ◽  
...  
Keyword(s):  
Magellanic Cloud ◽  
Ultraviolet Extinction ◽  
Far Ultraviolet

Far-ultraviolet extinction in σ Scorpii

1975 ◽  
Vol 34 (1) ◽  
pp. 19-22 ◽  
Author(s):  
Theodore P. Snow ◽  
Donald G. York
Keyword(s):  
Ultraviolet Extinction ◽  
Far Ultraviolet

scholarly journals Far-ultraviolet extinction and diffuse interstellar bands

2001 ◽  
Vol 326 (3) ◽  
pp. 1095-1100 ◽  
Author(s):  
A. Megier ◽  
S. Aiello ◽  
B. Barsella ◽  
S. Casu ◽  
J. Krelowski
Keyword(s):  
Diffuse Interstellar Bands ◽  
Ultraviolet Extinction ◽  
Far Ultraviolet

Modeling Grain Rotational Disruption by Radiative Torques and Extinction of Active Galactic Nuclei

2021 ◽  
Vol 922 (1) ◽  
pp. 47
Author(s):  
Nguyen Chau Giang ◽  
Thiem Hoang
Keyword(s):  
Active Galactic Nuclei ◽  
Extinction Ratio ◽  
Galactic Nuclei ◽  
Local Environment ◽  
Extinction Curve ◽  
Near Ultraviolet ◽  
Photometric Observations ◽  
Small Grains ◽  
Far Ultraviolet ◽  
Intense Radiation

Abstract Extinction curves observed toward individual Active Galactic Nuclei (AGN) usually show a steep rise toward far-ultraviolet (FUV) wavelengths and can be described by the Small Magellanic Cloud (SMC)-like dust model. This feature suggests the dominance of small dust grains of size a ≤ 0.1 μm in the local environment of AGN, but the origin of such small grains is unclear. In this paper, we aim to explain this observed feature by applying the RAdiative Torque Disruption (RATD) to model the extinction of AGN radiation from FUV to mid-infrared (MIR) wavelengths. We find that in the intense radiation field of AGN, large composite grains of size a ≥ 0.1 μm are significantly disrupted to smaller sizes by RATD up to d RATD > 100 pc in the polar direction and d RATD ∼ 10 pc in the torus region. Consequently, optical–MIR extinction decreases, whereas FUV-near-ultraviolet extinction increases, producing a steep far-UV rise extinction curve. The resulting total-to-selective visual extinction ratio thus significantly drops to R V < 3.1 with decreasing distances to AGN center due to the enhancement of small grains. The dependence of R V with the efficiency of RATD will help us to study the dust properties in the AGN environment via photometric observations. In addition, we suggest that the combination of the strength between RATD and other dust destruction mechanisms that are responsible for destroying very small grains of a ≤ 0.05 μm is the key for explaining the dichotomy observed “SMC” and “gray” extinction curve toward many AGN.

The Ultraviolet Extinction Curve for Circumstellar Dust Formed in the Hydrogen‐poor Environment of V348 Sagittarii

1997 ◽  
Vol 476 (2) ◽  
pp. 865-869 ◽  
Author(s):  
John S. Drilling ◽  
James H. Hecht ◽  
Geoffrey C. Clayton ◽  
Janet Akyuz Mattei ◽  
Arlo U. Landolt ◽  
...  
Keyword(s):  
Extinction Curve ◽  
Circumstellar Dust ◽  
Ultraviolet Extinction

Far-ultraviolet extinction determined from Voyager data

1990 ◽  
Vol 359 ◽  
pp. L23 ◽  
Author(s):  
Theodore P. Snow ◽  
M. M. Allen ◽  
R. S. Polidan
Keyword(s):  
Ultraviolet Extinction ◽  
Far Ultraviolet
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