$\text{H}\alpha$ dots: A catalog of faint emission-line objects discovered in narrowband images

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Date

2012

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The American Astronomical Society

Abstract

During a wide-field narrowband $\text{H}\alpha$ 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 $\text{H}\alpha$), isolated extragalactic H II regions associated with the galaxy targeted by the original observation, or background galaxies or QSOs where strong emission lines (most often [O III] $\lambda$ 5007) redshift into our narrowband filter. We have carried out a systematic search for these "$\text{H}\alpha$ dots" in over 200 15 × 15 arcmin fields. To date we have cataloged 61 candidate emission-line sources in roughly 11.7 deg$^{2}$. The sample has a median R magnitude of 19.5, and detects objects as faint as $R$ = 22.6. Follow-up spectroscopy reveals that ~85% of the candidates are bona fide emission-line objects, with roughly 60% of the real sources being lower-redshift objects (detection via $\text{H}\alpha$) and 40% being higher-redshift objects detected via [O III] emission or some other emission line. Here we present the results of our initial survey and follow-up spectroscopy. We use our sample to study the properties (including star-formation rates and metal abundances) of low-luminosity star-forming galaxies in the nearby universe and of low-metallicity star-forming galaxies at $z \approx 0.33$.

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Keywords

galaxies: abundances, galaxies: dwarf, galaxies: starburst, surveys

Citation

Kellar, J. A., Salzer, J. J., Wegner, G., Gronwall, C., & Williams, A. (2012). Hα dots: A catalog of faint emission-line objects discovered in narrowband images. Astronomical Journal, 143(6), 145. http://dx.doi.org/10.1088/0004-6256/143/6/145

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© 2012 The American Astronomical Society

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