Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.5204b&link_type=abstract
American Astronomical Society, AAS Meeting #212, #52.04; Bulletin of the American Astronomical Society, Vol. 40, p.248
Astronomy and Astrophysics
Astronomy
Scientific paper
The work presented here is about star formation in the unusual environment of collisional debris studied for the first time as such. These peculiar regions have an interstellar medium, and in particular a metallicity, similar to that of star forming regions in galactic discs while not undergoing similar environment effects.
This study has been conducted with a selection of exceptional systems that have ejected large quantities of gas into the intergalactic medium while also showing some intergalactic star forming regions. PI as well as archive spectroscopy and imaging from multi-wavelength observations ranging from far ultraviolet to mid-infrared have been used. Withal a model has been built in order to reproduce the SED of intergalactic star forming regions and constrain the star formation histories, their extinctions and their fraction of stars coming from the parent galaxies' discs. Comparisons have been performed on the estimation of SFR between infrared, Halpha and ultraviolet wavelengths.
This thesis has brought the following main new results:
* some regions seem to be deprived of any old stellar population, and these are ideal laboratories in which to study star formation
* the mid-infrared SFR estimator is as reliable as it is in spiral galaxies
* the scatter in the estimation of SFR in various bands is similar to that of spiral galaxies and is mainly due to age effects
* the combination of the extinction uncorrected Halpha line with mid-infrared yields a good estimation of the actual SFR
* an important part of star formation, up to 85%, takes place in the intergalactic medium showing that in a young universe, in which this type of system is much more common than in the nearby universe, star formation from collisional debris can be an important factor of enrichment of the intergalactic medium.
No associations
LandOfFree
Intergalactic Star Formation 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 Intergalactic Star Formation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intergalactic Star Formation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1396351