RT Book, Section
T1 Star Formation Rate estimators: [O II]λ3727 vs. Hα forlocal star-forming galaxies
A1 Aragón Salamanca, A.
A1 Alonso Herrero, A.
A1 Gallego Maestro, Jesús
A1 García Dabó, C. E.
A1 Pérez González, Pablo Guillermo
A1 Zamorano Calvo, Jaime
A1 Gil De Paz, Armando
AB The [O ii]λ3727 emission line is frequently used as an indicator of the star formation rate (SFR) despite its complex dependence on metallicity and excitation conditions. We have analysed the properties of the [O II] and Hα emission lines for a complete sample of local Hα-selected galaxies, the Universidad Complutense de Madrid (UCM) survey. We find a large scatter in the [O II]/Hα line ratios, although the scatter in the extinction-corrected [O II]^0/Hα^0 ratio is considerably smaller. We also find that the [O II]/Hα ratios are reasonably well correlated with the absolute B- and K-band magnitudes and with EW([O II]). However, the extinction-corrected [O II]^0/Hα^0 ratio is largely independent of these quantities, indicating that extinction is the main driver of the correlations. These correlations allow us to statistically predict-with varying degrees of accuracy-the observed and extinction-corrected Hα fluxes from the observed [O II] flux using the information contained in EW([O II]) and/or the absolute magnitudes, but extreme caution is needed to make sure that the sample selection effects are correctly taken into account.
PB Astronomical Society of the Pacific
SN 1-58381-144-3
YR 2003
FD 2003
LK https://hdl.handle.net/20.500.14352/53497
UL https://hdl.handle.net/20.500.14352/53497
LA eng
NO © 2003 Astronomical Society of the Pacific.Conference on Star Formation through Time (2002. Granada, Spain). This research was supported in part by the Spanish Programa Nacional de Astronomía y Astrofísica. AAS acknowledges generous financial support from the Royal Society. AGdP acknowledges financial support from NASA. PGPG acknowledges financial support from the Spanish Ministerio de Educación y Cultura. CEGD acknowledges financial support from the UCM.
NO Programa Nacional de Astronomía y Astrofísica (PNAyA)
NO Royal Society
NO National Aeronautics and Space Administration (NASA)
NO Ministerio de Educación y Cultura (MEC), España
NO Universidad Complutense de Madrid (UCM)
DS Docta Complutense
RD 17 abr 2025