Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-30
Astronomy and Astrophysics
Astrophysics
5 pages, Accepted for MNRAS letters
Scientific paper
10.1111/j.1745-3933.2008.00568.x
The mid-infrared ratio [NeIII]15.6mum/[NeII]12.8mum is a strong diagnostic of the ionization state of emission line objects, due to its use of only strong neon emission lines only weakly affected by extinction. However this ratio is not available to ground-based telescopes as only a few spectroscopic windows are available in the MIR. To deal with this problem we aimed to verify if there exists a conversion law between ground-accessible, strong MIR line ratio [SIV]/[NeII] and the diagnostic [NeIII]/[NeII] ratio that can serve as a reference for future ground-based observations. We collated the [SIV]10.5mum, [NeII]12.8mum, [NeIII]15.6\mum and [SIII]18.7mum emission line fluxes from a wide range of sources in the rich Spitzer and ISO archives, and compared the [NeIII]/[NeII], [SIV]/[SIII], and [SIV]/[NeII] ratios. We find a strong correlation between the [SIV]/[NeII] and [\neiii]/[\neii] ratio, with a linear fit of log([NeIII]/[NeII]) = 0.81log([SIV]/[NeII])+0.36, accurate to a factor of ~2 over four orders of magnitude in the line ratios. This demonstrates clearly the ability of ground-based infrared spectrographs to do ionization studies of nebulae.
Brandl Bernhard
Groves Brent
Nefs Bas
No associations
LandOfFree
The Mid-Infrared [SIV]/[NeII] versus [NeIII]/[NeII] Correlation 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 Mid-Infrared [SIV]/[NeII] versus [NeIII]/[NeII] Correlation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Mid-Infrared [SIV]/[NeII] versus [NeIII]/[NeII] Correlation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-504592