J-PAS: Exploring the connection between local environment and the triggering of bursty star formation in Extreme Emission Line Galaxies
Abstract
[Abridged]Extreme Emission Line Galaxies (EELGs) are compact, low-mass systems undergoing intense bursts of star formation, whose physical conditions resemble those of galaxies in the early Universe. We characterise the local environment of EELGs identified in the J-PAS survey to determine whether their extreme properties are associated with the presence of nearby companions, as expected if galaxy-galaxy interactions were the main trigger of the burst. We analyse 917 EELGs from the J-PAS internal data release at 0.03 ≲ z ≲ 0.9 over ∼30 deg2. We use the Pair Probability Function formalism, based on the full photometric redshift probability distributions, to identify companions within projected separations up to 200 kpc and velocity differences up to 500 km s−1. Stellar masses, star formation rates, dust attenuation, and metallicity estimates were derived for the EELGs and their companions through SED fitting with CIGALE, and Monte Carlo simulations were used to correct for projection and completeness effects. The average pair fraction of the EELGs is fpair = 0.162+0.048−0.033, indicating that only ∼16% of the sample has detectable companions, a value lower than the observed average for other star-forming galaxies within the adopted limits. When detected within the sensitivity and stellar-mass completeness limits of J-PAS, companions tend to be more massive and to show higher SED-based metallicity estimates than the EELGs, suggesting that the latter are typically the low-mass components of asymmetric pairs. However, lower-mass companions below these limits may remain undetected. No statistically significant correlation is found between the equivalent widths of the [OIII]λ5007, Hβ, and Hα emission lines and the projected separation to the detected companions within the J-PAS limits.
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BibTeX
@misc{gonzalezotero2026jpas,
title = {{J-PAS: Exploring the connection between local environment and the triggering of bursty star formation in Extreme Emission Line Galaxies}},
author = {Mauro González-Otero and Jose M. Vílchez and Antonio Giménez-Alcázar and Carlos López-Sanjuan and Ricardo Amorín and Antonio Arroyo-Polonio and Juan A. Fernández-Ontíveros and Sabyasachi Goswami and Antonio Hernán-Caballero and Jorge Iglesias-Páramo and Yolanda Jiménez-Teja and Carolina Kehrig and Raúl González-Díaz and Enrique Pérez-Montero and Alvaro Alvarez-Candal and Iris Breda and Ana L. Chies-Santos and Luis A. Díaz-García and Rosa M. González-Delgado and Ginés Martínez-Solaeche and Isabel Márquez and Francisco Javier Sáez Ruiz and David Sobral and Eduardo Telles and Stefano Zarattini and Zhen-Ya Zheng and Alejandro Lumbreras-Calle and Raul Abramo and Jailson Alcaniz and Narciso Benitez and Silvia Bonoli and Saulo Carneiro and Javier Cenarro and David Cristóbal-Hornillos and Simone Daflon and Renato Dupke and Alessandro Ederoclite and Carlos Hernández-Monteagudo and Jifeng Liu and Antonio Marín-Franch and Claudia Mendes de Oliveira and Mariano Moles and Fernando Roig and Laerte Sodré Jr. and Keith Taylor and Jesús Varela and Héctor Vázquez Ramió and Javier Zaragoza-Cardiel},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.02965},
eprint = {2611.02965},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.02965},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - J-PAS: Exploring the connection between local environment and the triggering of bursty star formation in Extreme Emission Line Galaxies
AU - Mauro González-Otero
AU - Jose M. Vílchez
AU - Antonio Giménez-Alcázar
AU - Carlos López-Sanjuan
AU - Ricardo Amorín
AU - Antonio Arroyo-Polonio
AU - Juan A. Fernández-Ontíveros
AU - Sabyasachi Goswami
AU - Antonio Hernán-Caballero
AU - Jorge Iglesias-Páramo
AU - Yolanda Jiménez-Teja
AU - Carolina Kehrig
AU - Raúl González-Díaz
AU - Enrique Pérez-Montero
AU - Alvaro Alvarez-Candal
AU - Iris Breda
AU - Ana L. Chies-Santos
AU - Luis A. Díaz-García
AU - Rosa M. González-Delgado
AU - Ginés Martínez-Solaeche
AU - Isabel Márquez
AU - Francisco Javier Sáez Ruiz
AU - David Sobral
AU - Eduardo Telles
AU - Stefano Zarattini
AU - Zhen-Ya Zheng
AU - Alejandro Lumbreras-Calle
AU - Raul Abramo
AU - Jailson Alcaniz
AU - Narciso Benitez
AU - Silvia Bonoli
AU - Saulo Carneiro
AU - Javier Cenarro
AU - David Cristóbal-Hornillos
AU - Simone Daflon
AU - Renato Dupke
AU - Alessandro Ederoclite
AU - Carlos Hernández-Monteagudo
AU - Jifeng Liu
AU - Antonio Marín-Franch
AU - Claudia Mendes de Oliveira
AU - Mariano Moles
AU - Fernando Roig
AU - Laerte Sodré Jr.
AU - Keith Taylor
AU - Jesús Varela
AU - Héctor Vázquez Ramió
AU - Javier Zaragoza-Cardiel
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.02965
UR - https://arxiv.org/abs/2611.02965
AB - [Abridged]Extreme Emission Line Galaxies (EELGs) are compact, low-mass systems undergoing intense bursts of star formation, whose physical conditions resemble those of galaxies in the early Universe. We characterise the local environment of EELGs identified in the J-PAS survey to determine whether their extreme properties are associated with the presence of nearby companions, as expected if galaxy-galaxy interactions were the main trigger of the burst. We analyse 917 EELGs from the J-PAS internal data release at 0.03 ≲ z ≲ 0.9 over ∼30 deg^2. We use the Pair Probability Function formalism, based on the full photometric redshift probability distributions, to identify companions within projected separations up to 200 kpc and velocity differences up to 500 km s^−1. Stellar masses, star formation rates, dust attenuation, and metallicity estimates were derived for the EELGs and their companions through SED fitting with CIGALE, and Monte Carlo simulations were used to correct for projection and completeness effects. The average pair fraction of the EELGs is f_pair = 0.162^+0.048_−0.033, indicating that only ∼16% of the sample has detectable companions, a value lower than the observed average for other star-forming galaxies within the adopted limits. When detected within the sensitivity and stellar-mass completeness limits of J-PAS, companions tend to be more massive and to show higher SED-based metallicity estimates than the EELGs, suggesting that the latter are typically the low-mass components of asymmetric pairs. However, lower-mass companions below these limits may remain undetected. No statistically significant correlation is found between the equivalent widths of the [OIII]λ5007, Hβ, and Hα emission lines and the projected separation to the detected companions within the J-PAS limits.
ER -