학술논문
The OTELO survey: the star formation rate evolution of low-mass galaxies
Document Type
Working Paper
Author
Cedrés, Bernabé; Pérez-García, Ana María; Pérez-Martínez, Ricardo; Cerviño, Miguel; Gallego, Jesús; Bongiovanni, Ángel; Cepa, Jordi; Martínez, Rocío Navarro; Nadolny, Jakub; Lara-López, Maritza A.; Sánchez-Portal, Miguel; Alfaro, Emilio J.; de Diego, José A.; González-Otero, Mauro; González, J. Jesús; González-Serrano, J. Ignacio; Torres, Carmen P. Padilla
Source
Subject
Language
Abstract
We present the analysis of a sample of \ha\,, \hb\ and \oii\ emission line galaxies from the \otelo\ survey, with masses typically below $log(M_*/M_\sun) \sim 9.4$ and redshifts between $z \sim 0.4$ and 1.43. We study the star formation rate, star formation rate density, and number density and their evolution with redshift. We obtain a robust estimate of the specific star formation rate -- stellar mass relation based on the lowest mass sample published so far. We also determine a flat trend of the star formation rate density and number density with redshift. Our results suggest a scenario of no evolution of the number density of galaxies, regardless of their masses, up to redshift $z\sim1.4$. This implies a gradual change of the relative importance of the star forming processes, from high-mass galaxies to low-mass galaxies, with decreasing redshift. We also find little or no variation of the star formation rate density in the redshift range of $0.4 Comment: 8 pages, 3 figures, accepted for publication in ApJ letters