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Hα Dots: A Catalog of Faint Emission-line Objects Discovered in Narrowband Images

  • Authors: Jessica A. Kellar, John J. Salzer, Gary Wegner, Caryl Gronwall, and Anna Williams

Kellar et al. 2012 The Astronomical Journal 143 145.

  • Provider: AAS Journals

Caption: Figure 1.

Example of an image showing two newly discovered Hα dots. The top panel is the continuum R-band image of UGC 2134 (the spiral in the center of the image), and the lower panel shows the Hα continuum-subtracted image of the same field. The two Hα dots in the image are circled. The dots appear as compact and isolated emission-line sources that are well separated from the galaxy that was the target of the Hα observations.

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