Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560631y&link_type=abstract
American Astronomical Society, AAS Meeting #215, #606.31; Bulletin of the American Astronomical Society, Vol. 36, p.1134
Astronomy and Astrophysics
Astronomy
Scientific paper
Emissions from warm molecules are often associated with supernova remnants and protostellar outflows, and are believed to result from the interaction between interstellar shocks and molecular clouds. The passage of non-dissociative shocks into a molecular cloud heats the gas to several hundred or several thousand Kelvin, and excites molecules to a series of high-lying energy levels. Many spectral lines have been detected, especially in the infrared spectral region, including cooling molecular lines from H2, CO, HD, and H2O, as well as atomic fine structure lines. Among them, the H2 emission lines are the most important diagnostic for studying the physical conditions.
We have investigated the shock-excited molecular regions associated with two Herbig-Haro objects - HH7-11 and HH54 - and four supernova remnants - W28, W44, 3C391 and IC443C. Spectroscopic data obtained from the Infrared Spectrograph (IRS) on board Spitzer, which cover eight H2 pure rotational lines, are mainly used to derive the physical parameters in our shock model. A power law distribution of gas temperatures is adopted, as predicted for a bow-shaped C-shock. Besides these H2 lines, we also use two HD lines detected by IRS, several high-lying rotational lines of CO measured by the Long Wavelength Spectrometer(LWS) on board the Infrared Space Observatory(ISO), and photometric data from the Spitzer's Infrared Array Camera(IRAC), which covers higher-lying transitions of H2 than those available to IRS, to provide further constraints on the shock model.
Our analysis of these observations above shows the best fit density is in the range of 103 to 105 cm-3, and the power law index b = - d ln M / dT that determines the local temperature distribution is around 2.3 to 3.4. Our maps of the best fit parameters exhibit that the high-lying H2 emissions trace the hot component of the gas as expected.
Neufeld David
Yuan Yuan
No associations
LandOfFree
Study Of Shocked Molecular Emissions In Supernova Remnants And Protostellar Outflows 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 Study Of Shocked Molecular Emissions In Supernova Remnants And Protostellar Outflows, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study Of Shocked Molecular Emissions In Supernova Remnants And Protostellar Outflows will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1888300