H&#206± Dots: Finding Isolated Extragalactic Emission-Line Objects in Narrow-Band Images

Details H&#206± Dots: Finding Isolated Extragalactic Emission-Line Objects in Narrow-Band Images H&#206± Dots: Finding Isolated Extragalactic Emission-Line Objects in Narrow-Band Images

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1906k&link_type=abstract

American Astronomical Society, AAS Meeting #212, #19.06; Bulletin of the American Astronomical Society, Vol. 40, p.216

Astronomy and Astrophysics

Astronomy

2

Scientific paper

During the course of a large-scale narrow-band Hα imaging survey, we noted the presence of numerous isolated emission-line point sources in the data. These objects could represent ultra-low luminosity galaxies at low redshift (detection via Hα), isolated extragalactic HII regions associated with the galaxy targeted by the original observation, or background galaxies or QSOs where strong emission lines (most often [O III]5007) redshifted into our Hα filter. Using special software developed by the authors, we carried out a systematic search for these "Hα dots" in over 200 15 x 15 arcmin fields. To date we have cataloged 61 candidate emission-line sources in roughly 13 square degrees. Most of these objects are quite faint (B > 18). Follow-up spectroscopy reveals that 75% are bona fide emission-line objects, with roughly half being lower redshift sources (detection via Hα) and half being higher redshift objects. Here we present the initial results of our survey and follow-up spectroscopy. We also highlight the application of Hα dots to a variety of problems, such as the study of ultra-low luminosity galaxies - including star-formation rates and metal abundances - and the properties of star-forming galaxies at z 0.32.

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