J-PLUS: Uncovering a large population of extreme [OIII] emitters in the local Universe

Lumbreras-Calle, A.; López-Sanjuan, C.; Sobral, D.; Fernández-Ontiveros, J. A.; M., Vílchez, J.; Hernán-Caballero, A.; Akhlaghi, M.; Díaz-García, L. A.; Alcaniz, J.; Angulo, R. E.; Cenarro, A. J.; Cristóbal-Hornillos, D.; Dupke, R. A.; Ederoclite, A.; Hernández-Monteagudo, C.; Marín-Franch, A.; Moles, M.; Sodré, L.; Ramió, H. Vázquez; Varela, J.

doi:10.48550/arxiv.2112.06938

Cited by 4 publications

(5 citation statements)

References 97 publications

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“…Although strict comparisons with other samples are difficult due to the different imposed selection criteria, we find a fair agreement in the counts of our sample compared to the EELGs of Cardamone et al (2009), Yang et al (2017), andLumbreras-Calle et al (2021). Our counts are, however, slightly lower than those of Amorín et al (2015) who used the zCOSMOS data, but still within the uncertainties.…”

Section: Discussionsupporting

confidence: 60%

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The miniJPAS survey: A search for extreme emission-line galaxies

Iglésias-Páramo¹,

Arroyo²,

Kehrig³

et al. 2022

A&A

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Context. Galaxies with extreme emission lines (EELGs) may play a key role in the evolution of the Universe, as well as in our understanding of the star formation process itself. For this reason an accurate determination of their spatial density and fundamental properties in different epochs of the Universe will constitute a unique perspective towards a comprehensive picture of the interplay between star formation and mass assembly in galaxies. In addition to this, EELGs are also interesting in order to explain the reionization of the Universe, since their interstellar medium (ISM) could be leaking ionizing photons, and thus they could be low z, analogous of extreme galaxies at high z. Aims. This paper presents a method to obtain a census of EELGs over a large area of the sky by detecting galaxies with rest-frame equivalent widths ≥ 300Å in the emission lines [Oii]λλ3727,3729Å, [Oiii]λ5007Å, and Hα. For this, we aim to use the J-PAS survey, which will image an area of ≈ 8000 deg 2 with 56 narrow band filters in the optical. As a pilot study, we present a methodology designed to select EELGs on the miniJPAS images, which use the same filter dataset as J-PAS, and thus will be exportable to this larger survey. Methods. We make use of the miniJPAS survey data, conceived as a proof of concept of J-PAS, and covering an area of ≈ 1 deg 2 . Objects were detected in the r SDSS images and selected by imposing a condition on the flux in a given narrow-band J-PAS filter with respect to the contiguous ones, which is analogous to requiring an observed equivalent width larger than 300Å in a certain emission line within the filter bandwidth. The selected sources were then classified as galaxies or quasi-stellar objects (QSOs) after a comparison of their miniJPAS fluxes with those of a spectral database of objects known to present strong emission lines. This comparison also provided a redshift for each source, which turned out to be consistent with the spectroscopic redshifts when available (|∆z/(1 + z spec )| ≤ 0.01). Results. The selected candidates were found to show a compact appearance in the optical images, some of them even being classified as point-like sources according to their stellarity index. After discarding sources classified as QSOs, a total of 17 sources turned out to exhibit EW 0 ≥ 300Å in at least one emission line, thus constituting our final list of EELGs. Our counts are fairly consistent with those of other samples of EELGs in the literature, although there are some differences, which were expected due to biases resulting from different selection criteria.

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Section: Discussionsupporting

confidence: 60%

“…In general, it is found that the rest-frame EW evolves with redshift as ionization efficiency increases (Sobral et al 2014;Khostovan et al 2016). Moreover, Lumbreras-Calle et al (2021) found a sample of EELGs at z ≤ 0.06 with [Oiii] EW over 300Å using 2000 deg 2 with the J-PLUS survey (Cenarro et al 2019).…”

Section: Introductionmentioning

confidence: 94%

The miniJPAS survey: A search for extreme emission-line galaxies

Iglésias-Páramo¹,

Arroyo²,

Kehrig³

et al. 2022

A&A

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“…A key detail for establishing a comprehensive and consistent framework relies on the assembly of a substantial number of exemplars across redshift. Predominantly through the exploration of deep narrow-or broadband photometry, several studies have contributed in this regard (e.g., Straughn et al 2009;van der Wel et al 2011;Amorín et al 2010;Atek et al 2011;Smit et al 2014;Lumbreras-Calle et al 2022). However, the information that can be extracted from this data type is rather limited, with the ideal being to acquire spectroscopic information for an equivalently high number of galaxies.…”

Section: Introductionmentioning

confidence: 99%

Characterisation of the stellar content of SDSS EELGs through self-consistent spectral modelling

Breda

Vı́lchez

Papaderos

et al. 2022

A&A

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Extreme emission line galaxies (EELGs) are a notable galaxy genus, ultimately being regarded as local prototypes of early galaxies at the cosmic noon. Robust characterisation of their stellar content, however, is hindered by the exceptionally high nebular emission present in their optical spectroscopic data. This study is dedicated into recovering the stellar properties of a sample of 414 EELGs as observed by the SDSS Survey. Such is achieved by means of the spectral synthesis code FADO, which self-consistently considers the stellar and nebular emission in an optical spectrum. Additionally, a comparative analysis was carried on, by further processing the EELGs sample with the purely stellar spectral synthesis code STARLIGHT, and by extending the analysis to a sample of 697 normal star-forming galaxies, expected to be less affected by nebular contribution. We find that, for both galaxy samples, stellar mass and mean age estimates by STARLIGHT are systematically biased towards higher values, and that an adequate determination of the physical and evolutionary properties of EELGs via spectral synthesis is only possible when nebular continuum emission is taken into account. Moreover, the differences between the two population synthesis codes can be ascribed to the degree of star-formation activity through the specific star-formation rate and the sum of the flux of the most prominent emission lines. As expected, on the basis of the theoretical framework, our results emphasise the importance of considering the nebular emission while performing spectral synthesis, even for galaxies hosting typical levels of star-formation activity.

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“…And galaxies with large [O III] equivalent widths (EWs; from 200 Å to 800 Å) are widely used to address the Lyα continuum escape fraction in the high-z universe (Fletcher et al 2019;Katz et al 2020;Barrow et al 2020). Their analogs at low z refer to the so-called "Green Pea" galaxies (Cardamone et al 2009), showing strong [O III] emission with extremely high [O III]/[O II] ratio (Jaskot et al 2013;Yang et al 2017;Yuma et al 2019;Lumbreras-Calle et al 2021;Liu et al 2022). The [O III] lines redshift into the near-infrared (NIR) and middle-infrared (MIR) bands for z > 3 objects.…”

Section: Introductionmentioning

confidence: 99%

The Physical Properties of Star-Forming Galaxies with Strong [O III] Lines at z=3.25

Wen,

An,

Zheng

et al. 2022

Preprint

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We present an analysis of physical properties of 34 [O III] emission-line galaxies (ELGs) at z = 3.254±0.029 in the Extended Chandra Deep Field South (ECDFS). These ELGs are selected from deep narrow H 2 S(1) and broad K s imaging of 383 arcmin 2 obtained with CFHT/WIRCam. We construct spectral energy distributions (SEDs) from U to K s to derive the physical properties of ELGs. These [O III] ELGs are identified as starburst galaxies with strong [O III] lines of L [O III] ∼ 10 42.6−44.2 erg s −1 , and have stellar masses of M * ∼ 10 9.0−10.6 M and star formation rates of ∼ 10-210 M yr −1 . Our results show that 24% of our sample galaxies are dusty with A V > 1 mag and EW([O III]) rest ∼ 70-500 Å, which are often missed in optically-selected [O III] ELG samples. Their rest-frame UV and optical morphologies from HST /ACS and HST /WFC3 deep imaging reveal that these [O III] ELGs are mostly multiple-component systems (likely mergers) or compact. And 20% of them are nearly invisible in the rest-frame UV due to heavy dust attenuation. Interestingly, we find that our samples reside in an overdensity consisting of two components: one South-East (SE) with an overdensity factor of δ gal ∼41 over a volume of 13 3 cMpc 3 and the other North-West (NW) with δ gal ∼38 over a volume of 10 3 cMpc 3 . The two overdense substructures are expected to be virialized at z = 0 with a total mass of ∼ 1.1 × 10 15 M and ∼ 4.8 × 10 14 M , and probably merge into a Coma-like galaxy cluster.

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J-PLUS: Uncovering a large population of extreme [OIII] emitters in the local Universe

Cited by 4 publications

References 97 publications

The miniJPAS survey: A search for extreme emission-line galaxies

The miniJPAS survey: A search for extreme emission-line galaxies

Characterisation of the stellar content of SDSS EELGs through self-consistent spectral modelling

The Physical Properties of Star-Forming Galaxies with Strong [O III] Lines at z=3.25

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