The millimeter wavelength emissivity in IC5146

Details The millimeter wavelength emissivity in IC5146 The millimeter wavelength emissivity in IC5146

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...329l..33k&link_type=abstract

Astronomy and Astrophysics, v.329, p.L33-L36 (1998)

Astronomy and Astrophysics

Astrophysics

51

Interstellar Medium: Clouds, Dust, Extinction, Individual Objects: Ic5146

Scientific paper

We have observed a core in the northern streamer of the IC5146 cloud using the MPIfR 19-channel Bolometer system on the IRAM 30m telescope at a wavelength of 1.2mm. We smoothed our observations to the same angular resolution (30'') as a new map of the NIR extinction of this cloud (Lada, Alves, and Lada 1998) and in this way obtained direct measurements of the ratio of millimeter emissivity to dust extinction. Our results are compatible with a ratio of the visual extinction coefficient kappa_V to the 1.2mm grain absorption coefficient kappa_ {1.2} of (4+/- 2) x 10(4) . This is in good agreement with the theoretical predictions for bare interstellar grains (Draine & Lee 1984; Mathis 1990). Within the errors our measurements are also consistent with recent models of grains with ice mantles whose size distribution has been modified due to coagulation but whose millimeter emissivities are not a strong function of grain size (Ossenkopf & Henning 1994). We find that the ratio of millimeter grain emissivity to visual extinction varies roughly inversely with the visual extinction over our map and interpret this as implying a gradient in dust temperature from roughly 8K in the core interior (A_V>20mag) to 20K in regions of low (5mag) extinction. One consequence of our result is that the 1.2mm intensity, by itself, is not a good tracer of mass in this cloud.

Affiliated with

Also associated with

No associations

Rating

The millimeter wavelength emissivity in IC5146 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 The millimeter wavelength emissivity in IC5146, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The millimeter wavelength emissivity in IC5146 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1650675