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J-PLUS: Unveiling the brightest end of the Ly α luminosity function at 2.0 < z < 3.3 over 1000 deg 2

2020; EDP Sciences; Volume: 643; Linguagem: Inglês

10.1051/0004-6361/202038756

1432-0746

Daniele Spinoso, Álvaro Orsi, C. López-Sanjuán, Silvia Bonoli, K. Viironen, David Izquierdo–Villalba, David Sobral, Siddhartha Gurung-López, A. Hernán-Caballero, A. Ederoclite, J. Varela, Roderik Overzier, Jordi Miralda‐Escudé, D. Muniesa, J. M. Vı́lchez, J. S. Alcaniz, Raúl E. Angulo, A. J. Cenarro, D. Cristóbal-Hornillos, Renato A. Dupke, C. Hernández‐Monteagudo, A. Marín-Franch, M. Moles, L. Sodré, H. Vázquez-Ramió,

Astronomy and Astrophysical Research

We present the photometric determination of the bright-end (L_Lya>10^43.5 erg/s) of the Lya luminosity function (LF) within four redshifts windows in the interval 2.2<z 10^43.3 erg/s) Lya-emitting candidates. We test our selection with two spectroscopic follow-up programs at the GTC telescope, confirming ~89% of the targets as line-emitting sources, with ~64% being genuine z~2.2 QSOs. We extend the 2.2<z<3.3 Lya LF for the first time above L_Lya~10^44 erg/s and down to densities of ~10^-8 Mpc^-3. Our results unveil with high detail the Schechter exponential-decay of the brightest-end of the Lya LF, complementing the power-law component of previous LF determinations at 43.3<Log_10(L_Lya / [erg/s]) 2 AGN/QSOs (likely dominant in our samples) are described by a structurally different LF than z>2 star-forming LAEs, namely with L^*_QSOs ~ 100 L^*_LAEs and Phi^*_QSOs ~ 10^-3 Phi^*_LAEs. Finally, our method identifies very efficiently as high-z line-emitters sources without previous spectroscopic confirmation, currently classified as stars (~2000 objects in each redshift bin, on average). Assuming a large predominance of Lya-emitting AGN/QSOs in our samples, this supports the scenario by which these are the most abundant class of z>2 Lya emitters at L_Lya>10^43.3 erg/s.