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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 693505.0, MPI für Astronomie / Publikationen_mpia
Observations of 6 - 200 mm emission of the Ophiuchus cloud LDN 1688
Authors:Rawlings, M. G.; Juvela, M.; Lehtinen, K.; Mattila, K.; Lemke, D.
Date of Publication (YYYY-MM-DD):2013
Title of Journal:Monthly Notices of the Royal Astronomical Society
Issue / Number:3
Start Page:2617
End Page:2627
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We examine two positions, ON1 and ON2, within the Ophiuchus cloud LDN 1688 using observations made with the ISOPHOT instrument aboard the ISO satellite. The data include mid-IR spectra (~6-12{\\mu}m) and several photometric bands up to 200{\\mu}m. The data probe the emission from molecular PAH-type species, transiently-heated Very Small Grains (VSGs), and large classical dust grains. We compare the observations to earlier studies, especially those carried out towards an isolated translucent cloud in Chamaeleon (Paper I). The spectra towards the two LDN 1688 positions are very similar to each other, in spite of position ON1 having a larger column density and probably being subjected to a stronger radiation field. The ratios of the mid-IR features are similar to those found in other diffuse and translucent clouds. Compared to paper I, the 7.7/11.3{\\mu}m band ratios are lower, ~2.0, at both LDN 1688 positions. A continuum is detected in the ~10{\\mu}m region. This is stronger towards the position ON1 but still lower than on any of the sightlines in Paper I. The far-infrared opacities are higher than for diffuse medium. The value of the position ON2, {\\tau}200/N(H) = 3.9 x 10^{-25} cm^2/H, is twice the value found for ON1. The radiation field of LDN 1688 is dominated by the two embedded B type double stars, {\\rho} Oph AB and HD 147889, with an additional contribution from the Upper Sco
Free Keywords:Astrophysics - Galaxy Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://cdsads.u-strasbg.fr/abs/2012arXiv1210.4956R [ID No:1]
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