2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium

Details 2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium 2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522l.129d&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 2, pp. L129-L132.

Astronomy and Astrophysics

Astronomy

15

Ism: Dust, Extinction, Infrared: Ism: Lines And Bands, Ism: Molecules

Scientific paper

Using a theoretical model previously developed to study the UV extinction produced by small carbon particles, we present results that show that the observed strength, profile and central wavelength of the interstellar 2175 Å absorption band can be reproduced with a two-component mixture of these particles. These consist of small dehydrogenated coronene molecules together with a size distribution of larger particles having a range of hydrogenation. Observed values of tau (2175 Å)/A_v and tau (3.4 μm)/A_v can be obtained if n(C)/n(H)~80 ppm is contained in this mixture. The 2175 Å peak in interstellar spectra can be simulated as the superposition of a central peak having gamma=0.9 mum^-1 and lambda^-1_0=4.58 mum^-1 arising from dehydrogenated coronene and a somewhat broader peak (gamma~1.25 mum^-1, lambda^-1_0~4.60 mum^-1) due to larger particles. Other solutions, incorporating as little carbon as n(C)/n(H)=28 ppm are also possible. Photoluminescence from these particles is also discussed in relation to the extended red emission spectrum.

Affiliated with

Also associated with

No associations

Rating

2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium 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 2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 2175 Å and 3.4 Micron Absorption Bands and Carbon Depletion in the Diffuse Interstellar Medium will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1769274