Attenuation law of normal disc galaxies with clumpy distributions of stars and dust

Details Attenuation law of normal disc galaxies with clumpy distributions of stars and dust Attenuation law of normal disc galaxies with clumpy distributions of stars and dust

2005-02-03

arxiv.org/abs/astro-ph/0502067v1

Mon.Not.Roy.Astron.Soc. 359 (2005) 171-182

Astronomy and Astrophysics

Astrophysics

MNRAS accepted, 13 pages, 14 figures

Scientific paper

10.1111/j.1365-2966.2005.08890.x

We investigate the attenuation law seen through an interstellar medium (ISM) with clumpy spatial distributions of stars and dust. The clumpiness of the dust distribution is introduced by a multi-phase ISM model. We solve a set of radiative transfer equations with multiple anisotropic scatterings through the clumpy ISM in a 1-D plane-parallel geometry by using the mega-grain approximation, in which dusty clumps are regarded as very large particles (i.e. mega-grains). The clumpiness of the stellar distribution is introduced by the youngest stars embedded in the clumps. We assume a smooth spatial distribution for older stars. The youngest stars are surrounded by denser dusty gas and suffer stronger attenuation than diffuse older stars (i.e. age-selective attenuation). The apparent attenuation law is a composite of the attenuation laws for the clumpy younger stars and for the diffuse older stars with a luminosity weight. In general, the stellar population dominating the luminosity changes from older stars to younger stars as the wavelength decreases. This makes the attenuation law steep; the composite attenuation rapidly increases from small attenuation for older stars at a long wavelength to large attenuation for younger stars at a short wavelength. The resultant attenuation law of normal disc galaxies is expected to be much steeper than that of starburst galaxies observed by Calzetti et al. Finally, the Calzetti's attenuation law is regarded as a special case with a large density in our framework.

Affiliated with

Also associated with

No associations

Rating

Attenuation law of normal disc galaxies with clumpy distributions of stars and dust does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Attenuation law of normal disc galaxies with clumpy distributions of stars and dust, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Attenuation law of normal disc galaxies with clumpy distributions of stars and dust will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-176781