Measuring the Metallicity of Early-type Galaxies. I. Composite Region

• Published in: The Astrophysical journal. Supplement series Vol. 252; no. 1; pp. 8 - 16
• Main Author: Wu, Yu-Zhong
• Format: Journal Article
• Language: English
• Published: Saskatoon The American Astronomical Society 01.01.2021; IOP Publishing
• Subjects: Abundance; Calibration; Correlation; Diagnostic software; Diagnostic systems; Dilution; Early-type galaxies; Emission analysis; Emission lines; Emission measurements; Galactic evolution; Galaxies; Galaxy abundances; Galaxy evolution; Indicators; Ionization; Metallicity; Separators; Sky surveys (astronomy); Star & galaxy formation; Star formation; Star formation rate; Stars

We present the data of 9739 early-type galaxies (ETGs), cross-matching Galaxy Zoo 1 with our sample selected from the catalog of the Sloan Digital Sky Survey Data Release 7 of MPA-JHU emission-line measurements. We first investigate the divisor between ETGs with and without star formation (SF), and...