Computer Science
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..67w&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Computer Science
Galaxies: Dwarf, Galaxies: Evolution, Galaxies: Ism, Infrared: Galaxies, Ism: General
Scientific paper
Low levels of polycyclic hydrocarbon (PAH) emission in the spectra of dwarf galaxies has been a puzzle for the past 20 years. Here, we present the mid-infrared (MIR) properties of 27 extremely low luminosity dwarf galaxies (Mr>-15 mag) observed with the Spitzer Infrared Array Camera (IRAC). The dwarf galaxies studied in this work are randomly selected from the Sloan Digital Sky Survey (SDSS). They are nearby (z≲ 0.005) and are mostly isolated from more luminous galaxies. Using the magnitude at 7.8 micron as a tracer of PAH content and the magnitude at 3.6 micron as a tracer of stellar population, we compare the [7.8 micron]-[3.6 micron] color with metallicity based on oxygen and nitrogen lines, and o3, which is used as an indicator of radiation field hardness. We find that the PAH feature in the 7.8 micron band becomes weaker as the total galaxy luminosity becomes fainter. This is in agreement with earlier observations of dwarf galaxies, including a small sample taken by ISO, and the data taken from overlap of SDSS with the Spitzer First Look Survey. This work contains galaxies of mean absolute magnitudes about 3 mags fainter than any previouly studied sample of dwarf galaxies.
Hogg David Wardell
Moustakas John
Wu Rebing
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