Extreme emission line galaxies at z < 0.05 with S-PLUS

LOPES, A. R.; TELLES, E.

São Paulo

Congreso; XLV Reunião Anual da SAB; 2022

Extreme emission line galaxies (EELGs) are low-metallicity star-forming galaxies that can be regarded as local analogs of galaxies in the early Universe. Due to their intense emission lines and low continuum, these objects are ideal targets to be studied using narrow-band photometry. Here, we will discuss the approach and results in our search for EELG candidates at z < 0.05 usingS-PLUS, a wide field 12 (5 broad and 7 narrow) bands survey that observes the Southern Sky. The methodology relies in an initial sample obtained from the detection of an excess in a given narrow band due to the presence of an emission line. EELGs at z < 0.05 are [OIII] emitters, and consequently should present an excess in S-PLUS J0515 filter. Based on ∼ 440 known EELGs from SDSScross-matched with S-PLUS DR3 and unWISE data in the Stripe82 area, we remove contaminants (QSOs, stars) from our sample. We find a total of 248 EELGs, and after additional analysis, including SED-fitting, we confirm that this sample contains galaxies with low mass, low metallicity, and high equivalent widths (for [OIII]: >200Å, for Hα: > 100Å). Spectroscopic follow-ups are needed toconfirm our findings.