Star Formation Laws in LITTLE THINGS Dwarfs: The Case of DDO133 and DDO168

Details Star Formation Laws in LITTLE THINGS Dwarfs: The Case of DDO133 and DDO168 Star Formation Laws in LITTLE THINGS Dwarfs: The Case of DDO133 and DDO168

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910602f&link_type=abstract

American Astronomical Society, AAS Meeting #219, #106.02

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the results of our pilot study of the star formation (SF) characteristics of two LITTLE THINGS dwarfs: DDO133 and DDO168. For each galaxy, we combine HI spectral line VLA radio interferometric observations in B-, C-, and D-configurations into one data set of high resolution and quality which allows an in depth investigation of their HI distribution and kinematics. We focus our interest on their SF characteristics extending current investigations of the Schmidt-Kennicutt law to the low luminosity, low metallicity regime. To do this, we combine our HI maps with GALEX ultraviolet, Spitzer infrared and, where available, CO data in order to measure the surface densities of HI, H2 and the SFR surface density for the galaxies in our sample. We find a general lack of Spitzer 24 micron emission which fits in with our result that internal extinction is less than 0.1 mag, indicating a dust-poor ISM. Our results overlap with those published on a number of THINGS dwarfs and confirm the finding that the SF characteristics of dwarfs resemble those in the outskirts of spirals. The study applied to DDO133 and DDO168 is being extended to a larger LITTLE THINGS subsample, which will be the subject of a future paper.

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