Hydrocarbon Emission Mechanism
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Active In SP

Posts: 3
Joined: Apr 2010
24-06-2010, 11:04 PM

pls help me in these topic:
Hydrocarbon Emission Mechanism
project report helper
Active In SP

Posts: 2,270
Joined: Sep 2010
22-09-2010, 10:37 AM

More Info About Hydrocarbon Emission Mechanism

We present a sample of low-resolution 5-38 μm Spitzer IRS spectra of the inner few square kiloparsecs of 59 nearby galaxies spanning a large range of star f ormation properties. A robust method for decomposing mid-infrared galaxy spectra is described and used to explore the behavior of PAH emission and the prevalence of silicate dust extinction. Evidence for silicate extinction is found in ~ of the sample, at strengths that indicate that most normal galaxies undergo AV 3 mag averaged over their centers . The contribution of PAH emission to the total infrared power is found to peak near 10% and extend up to ~20% and is suppressed at metallicities Z Z/4, as well as in low-luminosity AGN environments. Strong interband PAH feature strength variations (2-5 times) are observed, with the presence of a weak AGN and, to a lesser degree, increasing metallicity shifting power to the longer wavelength bands. A peculiar PAH emission spectrum with markedly diminished 5-8 μm features arises among the sample solely in systems with relatively hard radiation fields harboring low-luminosity AGNs. The AGNs may modify the emitting grain distribution and provide the direct excitation source of the unusual PAH emission, which cautions against using absolute PAH strength to estimate star formation rates in systems harboring active nuclei. Alternatively, the low star formation intensity often associated with weak AGNs may affect the spectrum. The effect of variations in the mid-infrared spectrum on broadband infrared surveys is modeled and points to more than a factor of 2 uncertainty in results that assume a fixed PAH emission spectrum, for redshifts z = 0-2.5.

refered by

J. D. T. Smith1, B. T. Draine2, D. A. Dale3, J. Moustakas1, R. C. Kennicutt, Jr.1,4, G. Helou5, L. Armus6, H. Roussel7, K. Sheth3, G. J. Bendo8, B. A. Buckalew6, D. Calzetti9, C. W. Engelbracht1, K. D. Gordon1, D. J. Hollenbach10, A. Li11, S. Malhotra12, E. J. Murphy13 and F. Walter7

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page

Quick Reply
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  scotch yoke mechanism report in mini project in pdf Guest 1 142 31-10-2016, 03:36 PM
Last Post: jaseela123
  box transport mechanism ppt Guest 1 126 31-10-2016, 03:12 PM
Last Post: amrutha735
  automatic room toilette perfume spray mechanism Guest 1 59 31-10-2016, 11:55 AM
Last Post: amrutha735
  box shifting mechanism wikipedia Guest 1 73 31-10-2016, 11:37 AM
Last Post: anusree
  mechanical spider klann mechanism project report pdf ppt Guest 1 72 29-10-2016, 03:23 PM
Last Post: Dhanabhagya
  paper cutting machine using geneva mechanism ppt Guest 1 186 29-10-2016, 02:44 PM
Last Post: jaseela123
  ppt on geneva mechanism free download Guest 1 68 29-10-2016, 02:44 PM
Last Post: jaseela123
  advantages and disadvantages slider crank mechanism Guest 1 76 29-10-2016, 12:14 PM
Last Post: jaseela123
Wink drilling machine using geniva mechanism Guest 1 65 12-10-2016, 09:07 AM
Last Post: amrutha735
  box shifting mechanism mini project Guest 1 85 12-10-2016, 08:58 AM
Last Post: amrutha735