Properties of the KISS Green Pea Galaxies. (arXiv:2006.14663v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Brunker_S/0/1/0/all/0/1">Samantha W. Brunker</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Salzer_J/0/1/0/all/0/1">John J. Salzer</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Janowiecki_S/0/1/0/all/0/1">Steven Janowiecki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Finn_R/0/1/0/all/0/1">Rose A. Finn</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Helou_G/0/1/0/all/0/1">George Helou</a>

Green Peas are a class of extreme star-forming galaxies at intermediate
redshifts, originally discovered via color-selection using multi-filter,
wide-field survey imaging data (Cardamone et al. 2009). They are commonly
thought of as being analogs of high-redshift Ly$alpha$-emitting galaxies. The
defining characteristic of Green Pea galaxies is a high-excitation nebular
spectrum with very large equivalent width lines, leading to the recognition
that Green Pea-like galaxies can also be identified in samples of emission-line
galaxies. Here we compare the properties a sample of [O III]-selected
star-forming galaxies (z = 0.29-0.41) from the KPNO International Spectroscopic
Survey (KISS) with the color-selected Green Peas. We find that the KISS [O
III]-selected galaxies overlap with the parameter space defined by the
color-selected Green Peas; the two samples appear to be drawn from the same
population of objects. We compare the KISS Green Peas with the full
H$alpha$-selected KISS star-forming galaxy sample (z $<$ 0.1) and find that
they are extreme systems. Many appear to be young systems at their observed
look-back times (3-4 Gyr), with more than 90% of their rest-frame B-band
luminosity coming from the starburst population. We compute the volume density
of the KISSR Green Peas at z = 0.29-0.41 and find that they are extremely rare
objects. We don’t see galaxies as extreme as the KISSR Green Peas in the local
Universe, although we recognize several lower-luminosity systems at z $<$ 0.1.

Green Peas are a class of extreme star-forming galaxies at intermediate
redshifts, originally discovered via color-selection using multi-filter,
wide-field survey imaging data (Cardamone et al. 2009). They are commonly
thought of as being analogs of high-redshift Ly$alpha$-emitting galaxies. The
defining characteristic of Green Pea galaxies is a high-excitation nebular
spectrum with very large equivalent width lines, leading to the recognition
that Green Pea-like galaxies can also be identified in samples of emission-line
galaxies. Here we compare the properties a sample of [O III]-selected
star-forming galaxies (z = 0.29-0.41) from the KPNO International Spectroscopic
Survey (KISS) with the color-selected Green Peas. We find that the KISS [O
III]-selected galaxies overlap with the parameter space defined by the
color-selected Green Peas; the two samples appear to be drawn from the same
population of objects. We compare the KISS Green Peas with the full
H$alpha$-selected KISS star-forming galaxy sample (z $<$ 0.1) and find that
they are extreme systems. Many appear to be young systems at their observed
look-back times (3-4 Gyr), with more than 90% of their rest-frame B-band
luminosity coming from the starburst population. We compute the volume density
of the KISSR Green Peas at z = 0.29-0.41 and find that they are extremely rare
objects. We don’t see galaxies as extreme as the KISSR Green Peas in the local
Universe, although we recognize several lower-luminosity systems at z $<$ 0.1.

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