SWS spectroscopy of small grain features across the M17-Southwest photodissociation front

نویسندگان

  • L. Verstraete
  • R. Timmermann
چکیده

We present SWS spectra taken across the M17Southwest photodissociation front and discuss spectral properties of PAHs and VSGs. We report new features at 4.65, 6.35, 8.7 and 11 m which we interpret as PAHs and/or VSGs emission. From feature intensity ratios along the cut, we find PAHs are mainly ionized and almost fully hydrogenated.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Infrared Emission from Interstellar Dust. I. Stochastic Heating of Small Grains

We present a method for calculating the infrared emission from a population of dust grains heated by starlight, including very small grains for which stochastic heating by starlight photons results in hightemperature transients. Because state-to-state transition rates are generally unavailable for complex molecules, we consider model polycyclic aromatic hydrocarbon (PAH), graphitic, and silicat...

متن کامل

Non-equilibrium Photodissociation Regions: Ionization-dissociation Fronts

We discuss the theory of coupled ionization{dissociation fronts produced when molecular clouds are exposed to < 1110 A radiation from hot stars. A steady, composite structure is developed, which generally includes an ionized outtow away from the cloud, an ionization front, a layer of photodissociated gas, a photodissociation front, and a shock wave preceding the photodissociation front. We show...

متن کامل

Laser Micro-Raman Spectroscopy of CVD Nanocrystalline Diamond Thin Film

Laser micro-Raman spectroscopy is an ideal tool for assessment and characterization of various types of carbon-based materials. Due to its special optical properties (CrN) coated stainless steel substrates. NCD films have been investigated by laser micro-Raman spectroscopy. The fingerprint of diamond based materials is in the spectral region of 1000-1600 cm-1 in the first order of Raman scatter...

متن کامل

Extended [c I] and 13 Co(5→4) Emission in M17sw

We mapped a 13×22 pc region in emission from 492 GHz [C I] and, for the first time, 551 GHz 13CO(5→4) in the giant molecular cloud M17SW. The morphologies of the [C I] and 13CO emission are strikingly similar. The extent and intensity of the [C I] and 13CO(5→4) emission is explained as arising from photodissociation regions on the surfaces of embedded molecular clumps. Modeling of the 13CO(5→4)...

متن کامل

Parametric model based assessment of genotype×environment interactions for grain yield in durum wheat under irrigation

The objectives of this study were to assess the genotype (G) by environment (E) interaction of grain yield of durum wheat(Triticum durum Desf.) based on parametric models, additive main effects and multiplicative interaction (AMMI) and joint linear regression models; and compare the relative efficiency of the two models in explaining the GE effects. Twenty-three genotypes were evaluated across ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1996