New Hα Dots Found in Narrow-Band Images of ALFALFA Galaxies

Details New Hα Dots Found in Narrow-Band Images of ALFALFA Galaxies New Hα Dots Found in Narrow-Band Images of ALFALFA Galaxies

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545715d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #457.15; Bulletin of the American Astronomical Society, Vol. 42, p.482

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a catalog and example images of newly discovered faint point sources of emission - called Hα dots - found in narrow-band images taken for the ALFALFA Hα project. These images target galaxies discovered in the blind HI ALFALFA survey, with the purpose of measuring their star-formation characteristics. Our image analysis turns up a large population of serendipitously discovered emission-line sources that are not associated with the target ALFALFA galaxy. Follow-up spectroscopy reveals that these objects are a mix of isolated extragalactic HII regions, ultra-low luminosity dwarf galaxies, background (higher redshift) galaxies, and QSOs. We present examples of several Hα dots as well as follow-up spectroscopy for a number of objects. We also illustrate why these objects are of astrophysical interest. For example, this selection method appears to provide a rich sample of very low metallicity dwarf systems.

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