10-μm absorption spectra of silicates for two new diffuse interstellar medium sightlines

Details 10-μm absorption spectra of silicates for two new diffuse interstellar medium sightlines 10-μm absorption spectra of silicates for two new diffuse interstellar medium sightlines

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.348l..13b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 2, pp. L13-L17.

Astronomy and Astrophysics

Astronomy

2

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

Scientific paper

We present low resolution 10-μm spectra of the newly identified diffuse interstellar medium (ISM) sightlines towards StRS 217 and StRS 371 and a new spectrum of Cyg OB2 no. 12 obtained at the UK Infrared Telescope (UKIRT) with the Michelle imager/spectrometer. As previously, the μ Cephei emissivity better represents the profile of diffuse medium silicates than does the broader Trapezium emissivity which is characteristic of dust in molecular clouds. These spectra together with seven spectra published by Roche & Aitken comprise the majority of the silicates data set for the diffuse ISM. The observed sample includes sources in the first galactic quadrant at heliocentric distances of about 1.0-4.2 kpc. We find the silicate optical depth, csil=AV/(19.2 +/- 0.6) and the ratio of csil to heliocentric distance, d, is in the range 0.1 <~csil/d<~ 0.7 kpc-1 for StRS 217 the ratio could be as high as csil/d<~ 1.2 kpc-1. However, this ratio is dominated by uncertainties in the distance estimates and does not indicate the degree of clumping in the diffuse interstellar medium.

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