The Effect of Light Scattering by Dust in Galactic Halos on Emission-Line Ratios | Zendy

Andrea Ferrara | Zendy; S. Bianchi | Zendy; R.J. Dettmar | Zendy; C. Giovanardi | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

The Effect of Light Scattering by Dust in Galactic Halos on Emission-Line Ratios

Author(s) -

Andrea Ferrara,

S. Bianchi,

R.J. Dettmar,

C. Giovanardi

Publication year - 1996

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 - 10.1086/310212

Subject(s) - physics , radiative transfer , astrophysics , galaxy , halo , line (geometry) , scattering , polarization (electrochemistry) , emission spectrum , linear polarization , astronomy , spectral line , optics , geometry , chemistry , laser , mathematics

We present results from Monte Carlo simulations describing the radiationtransfer of $H\alpha$ line emission, produced both by HII regions in the diskand in the diffuse ionized gas (DIG), through the dust layer of the galaxyNGC891. This allows us to calculate the amount of light originating in the HIIregions of the disk and scattered by dust at high $z$, and compare it with theemission produced by recombinations in the DIG. The cuts of photometric andpolarimetric maps along the $z$-axis show that scattered light from HII regionsis still 10\% of that of the DIG at $z\sim 600$~pc, whereas the the degree oflinear polarization is small ($<1$\%). The importance of these results for thedetermination of intrinsic emission line ratios is emphasized, and thesignificance and possible implications of dust at high $z$ are discussed.Comment: 12 pages, LaTeX (aasms4.sty), 2 figures; ApJ Letters, accepted, June 5t

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research