2026-06-28T20:33:03Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/338912024-09-12T13:04:33Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Rodríguez Muñoz, Lucía
author
Gallego Maestro, Jesús
author
Pacifici, Camilla
author
Tresse, Laurence
author
Charlot, Stéphane
author
Gil De Paz, Armando
author
Barro, Guillermo
author
Villar, Víctor
2023-06-19T13:30:22Z
2023-06-19T13:30:22Z
2015-01-20
0004-637X
10.1088/0004-637X/799/1/36
https://hdl.handle.net/20.500.14352/33891
http://dx.doi.org/10.1088/0004-637X/799/1/36
http://iopscience.iop.org/
The epoch when low-mass star-forming galaxies (LMSFGs) form the bulk of their stellar mass is uncertain. While some models predict an early formation, others favor a delayed scenario until later ages of the universe. We present constraints on the star formation histories (SFHs) of a sample of LMSFGs obtained through the analysis of their spectral energy distributions using a novel approach that (1) consistently combines photometric (broadband) and spectroscopic (equivalent widths of emission lines) data, and (2) uses physically motivated SFHs with non-uniform variations of the star formation rate (SFR) as a function of time. The sample includes 31 spectroscopically confirmed LMSFGs (7.3 <= logM(*)/M circle dot <= 8.0), at 0.3 < z(spec) < 0.9, in the Extended-Chandra Deep Field-South field. Among them, 24 were selected with photometric stellarmass logM(*)/M circle dot < 8.0, 0.3< z(phot) < 1.0, and m(NB816, AB) < 26 mag; the remaining 7 were selected as blue compact dwarfs within the same photometric redshift and magnitude ranges. We also study a secondary sample of 43 more massive spectroscopically confirmed galaxies (8.0 < logM(*)/M circle dot <= 9.1), selected with the same criteria. The SFRs and stellar masses derived for both samples place our targets on the standard main sequence of star-forming galaxies. The median SFH of LMSFGs at intermediate redshifts appears to form 90% of the median stellar mass inferred for the sample in the similar to 0.5-1.8 Gyr immediately preceding the observation. These results suggest a recent stellar mass assembly for LMSFGs, consistent with the cosmological downsizing trends. We find similar median SFH timescales for the more massive secondary sample.
eng
Recent stellar mass assembly of low-mass star-forming galaxies at redshifts 0.3 < z < 0.9*
journal article
URL
https://docta.ucm.es/bitstreams/4ca5ec9a-53ec-4996-9ca6-947170e4e55f/download
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b87fb6ed74b07180739a13ec6b3e4ce9
330688
application/pdf
jesusgallego125libre.pdf