Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies

Details Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381...42j&link_type=abstract

The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,

Other

Scientific paper

We present Spitzer Space Telescope 4.5 and 8.0 μm imaging of 15 Local Group and nearby dwarf galaxies. We detect prominent diffuse 8 μm emission in four of the most luminous galaxies in the sample (IC~1613, IC~5152, NGC~55, and NGC~3109), very low surface brightness emission from four others (DDO~216, Sextans~A, Sextans~B, WLM), and no diffuse emission from the remaining objects. These systems all have evidence for old and intermediate age star formation, thus the lack of diffuse 8 μm emission cannot be attributed to young galaxy ages. Also, we find that blowouts are unlikely to explain the paucity of diffuse 8 μm emission, since high resolution imaging of the neutral gas in these objects show no evidence of this. We propose the lack of this emission in low-metallicity systems may be due to the destruction of dust grains by supernova shocks, assuming the timescale to regrow dust grains and PAH molecules is long compared to the destruction timescale. The most likely explanation for the observed weak diffuse 8 μm emission is at least partly due to a general absence of dust (including PAHs), in agreement with their low metallicities.

Affiliated with

Also associated with

No associations

Rating

Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies 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 Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Observations of Diffuse 8 μm Emission in Local Group and Nearby Dwarf Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-951980