THE METAL ABUNDANCES ACROSS COSMIC TIME (MACT) SURVEY. I. OPTICAL SPECTROSCOPY in the SUBARU DEEP FIELD

Chun Ly, Sangeeta Malhotra, Matthew A. Malkan, Jane R. Rigby, Nobunari Kashikawa, Mithi A. De Los Reyes, James E. Rhoads

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Deep rest-frame optical spectroscopy is critical for characterizing and understanding the physical conditions and properties of the ionized gas in galaxies. Here, we present a new spectroscopic survey called "Metal Abundances across Cosmic Time" or MACT, which will obtain rest-frame optical spectra for ∼ 3000 emission-line galaxies. This paper describes the optical spectroscopy that has been conducted with MMT/Hectospec and Keck/DEIMOS for ≈ 1900 z = 0.1-1 emission-line galaxies selected from our narrowband and intermediate-band imaging in the Subaru Deep Field. In addition, we present a sample of 164 galaxies for which we have measured the weak [O III] λ 4363 line (66 with at least 3α detections and 98 with significant upper limits). This nebular emission line determines the gas-phase metallicity by measuring the electron temperature of the ionized gas. This paper presents the optical spectra, emission-line measurements, interstellar properties (e.g., metallicity, gas density), and stellar properties (e.g., star formation rates, stellar mass). Paper II of theMACT survey (Ly et al.) presents the first results on the stellar mass-gas metallicity relation at z≲1 using the sample with [O III]λ4363 measurements.

Original languageEnglish (US)
Article number5
JournalAstrophysical Journal, Supplement Series
Volume226
Issue number1
DOIs
StatePublished - Sep 2016

Keywords

  • abundances
  • galaxies: ISM
  • galaxies: distances and redshifts
  • galaxies: evolution
  • galaxies: photometry
  • galaxies: star formation Supporting material: FITS file, machine-readable

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Ly, C., Malhotra, S., Malkan, M. A., Rigby, J. R., Kashikawa, N., De Los Reyes, M. A., & Rhoads, J. E. (2016). THE METAL ABUNDANCES ACROSS COSMIC TIME (MACT) SURVEY. I. OPTICAL SPECTROSCOPY in the SUBARU DEEP FIELD. Astrophysical Journal, Supplement Series, 226(1), [5]. https://doi.org/10.3847/0067-0049/226/1/5