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We study the effect of variations in dust size distribution and composition on the correlation between the spectral shape of extinction (parameterized by $R_{\textrm{V}}$) and far-infrared dust emissivity (parameterized by the power-law…

星系天体物理 · 物理学 2021-05-20 Ioana A. Zelko , Douglas P. Finkbeiner

We study the extinction properties of the composite dust grains, consisting of host silicate spheroids and graphite as inclusions, using discrete dipole approximation (DDA). We calculate the extinction cross sections of the composite grains…

太阳与恒星天体物理 · 物理学 2015-06-17 Nisha Katyal , Ranjan Gupta , D B Vaidya

The relationship between dust polarization and extinction was determined for the cold dense starless molecular cloud core FeSt 1-457 based on the background star polarimetry of dichroic extinction at near-infrared wavelengths. Owing to the…

The large majority of extinction sight lines in our Galaxy obey a simple relation depending on one parameter, the total-to-selective extinction coefficient, Rv. Different values of Rv are able to match the whole extinction curve through…

星系天体物理 · 物理学 2015-05-20 Paola Mazzei , Guido Barbaro

Dust extinction is one of the fundamental measurements of dust grain sizes, compositions, and shapes. Most of the wavelength dependent variations seen in Milky Way extinction are strongly correlated with the single parameter…

Understanding variations in the dust extinction curve is imperative for using dust as a tracer of local structure in the interstellar medium, understanding dust chemistry, and observational color corrections where dust is a nuisance…

星系天体物理 · 物理学 2025-07-11 Andrew K. Saydjari , Gregory M. Green

We investigate the resolved relation between local extinction and star formation surface density within nearby star-forming galaxies selected from the MaNGA survey. Balmer decrement measurements imply an extinction of the H{\alpha} line…

星系天体物理 · 物理学 2019-02-20 Huan Li , Stijn Wuyts , Lei Hao , Lin Lin , Man I Lam , Médéric Boquien , Brett H. Andrews , Donald P. Schneider

We present 3 methods for measuring the Galactic dust extinction law slope R_V and a method for quantifying fine structure in dust clouds in the direction of differentially-reddened globular clusters. We apply these methods to the low-…

天体物理学 · 物理学 2009-11-10 J. Melbourne , P. Guhathakurta

(abridged) The dust content of the universe is primarily explored via its interaction with stellar photons, producing interstellar extinction. However, owing to the physical extension of the observing beam, observations may detect scattered…

太阳与恒星天体物理 · 物理学 2015-12-02 P. Scicluna , R. Siebenmorgen

Using over a million and a half extragalactic spectra we study the correlations of the Diffuse Interstellar Bands (DIBs) in the Milky Way. We measure the correlation between DIB strength and dust extinction for 142 DIBs using 24 stacked…

星系天体物理 · 物理学 2015-08-06 Dalya Baron , Dovi Poznanski , Darach Watson , Yushu Yao , Nick L. J. Cox , J. Xavier Prochaska

The joint use of accurate near- and mid-infrared photometry from the 2MASS and WISE catalogues has allowed the variations of the extinction law and the dust grain size distribution in high Galactic latitudes (|b|>50) at distances up to 3…

星系天体物理 · 物理学 2019-10-25 George Gontcharov

We examine the three-dimensional structure and dust extinction properties in a ~ 200 pc $\times$ 100 pc region in the southwest bar of the Small Magellanic Cloud (SMC). We model a deep Hubble Space Telescope optical color-magnitude diagram…

We report results of a near--infrared imaging survey of L977, a dark cloud in Cygnus seen in projection against the plane of the Milky Way. We use measurements of the near--infrared color excess and positions of the 1628 brightest stars in…

天体物理学 · 物理学 2009-10-30 J. Alves , C. Lada , E. Lada , S. Kenyon , R. Phelps

We present a new version of our analytical model of the spatial interstellar extinction variations within the nearest kiloparsec. This model treats the 3D dust distribution as a superposition of three overlapping layers: (1) the layer along…

We report observations of the J =(1--0) C18O molecular emission line toward the L977 molecular cloud. To study the correlation between C18O emission and dust extinction we constructed a Gaussian smoothed map of the infrared extinction…

天体物理学 · 物理学 2009-10-30 J. Alves , C. Lada , E. Lada

We constrain the light extinction properties of Milky Way dust. We investigated the correlations between dust column density as inferred from infrared data and the observed colours of celestial objects at cosmological distances with low…

星系天体物理 · 物理学 2015-06-11 Edvard Mortsell

Using star-forming galaxies sample in the nearby Universe (0.02<z<0.10) selected from the SDSS (DR7) and GALEX all-sky survey (GR5), we present a new empirical calibration for predicting dust extinction of galaxies from H-alpha-to-FUV flux…

We investigate the luminosity and redshift dependence of the quasar continuum by means of composite spectrum using a large non-BAL radio-quiet quasar sample drawn from the Sloan Digital Sky Survey. Quasar continuum slopes in the UV-Opt band…

宇宙学与河外天体物理 · 物理学 2015-06-24 Xiaoyi Xie , Shiyin Shen , Zhengyi Shao , Jun Yin

Small angle scattering by dust grains causes a significant contribution to the total interstellar extinction for any X-ray instrument with sub-arcminute resolution (Chandra, Swift, XMM-Newton). However, the dust scattering component is not…

高能天体物理现象 · 物理学 2016-02-24 L. Corrales , J. Garcia , J. Wilms , F. Baganoff

Three dimensional interstellar extinction maps provide a powerful tool for stellar population analysis. We use data from the VISTA Variables in the Via Lactea survey together with the Besan\c{c}on stellar population synthesis model of the…

星系天体物理 · 物理学 2015-06-19 M. Schultheis , B. Q. Chen , B. W. Jiang , O. A. Gonzalez , R. Enokiya , Y. Fukui , K. Torii , M. Rejkuba , D. Minniti
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