Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714716f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #147.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present newly discovered faint point sources of emission - called Hα dots - found in narrow-band images taken for the ALFALFA Hα project. These images target ALFALFA survey galaxies for 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. In addition to presenting several dozen new objects, we have acquired and reduced spectral data for nearly all of the sample. These spectra reveal 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 along with their follow-up spectroscopy, and give a summary of the properties of the full sample of Hα dots discovered to date. We also illustrate why these objects are of astrophysical interest. For example, this selection method appears to provide a rich sample of nearby, very low metallicity dwarf systems, as well as luminous [O III]-detected star-forming galaxies at z 0.32 with unusually low abundances.
Feddersen Jesse
Gronwall Caryl
Salzer John Joseph
Williams Adam
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