High and low surface brightness galaxies in the local universe. IV. Optical and 21 centimeter spectroscopy

Chris Impey, Valorie Burkholder, David Sprayberry

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

We present flux-calibrated spectra in the range 3500 to 8000 A for the nuclear regions of 250 galaxies and H I 21 cm line profiles for 238 galaxies selected from the catalog of low surface brightness galaxies identified in Automated Plate Measuring Facility (APM) scans of UK Schmidt Telescope survey plates. For the optical spectra, common nebular absorption-and emission-line equivalent widths and emission-line fluxes were measured with typical errors of about 20%. H I mass and velocity widths were measured from the 21 cm line emission, with 15% accuracy. Galaxies in this study span over 6 mag in surface brightness. Only about 20% of these galaxies show spectroscopic evidence of active galactic nuclei. Derived quantities such as synthetic colors, metallicity, star formation rate, the ratio of neutral hydrogen mass to blue light, and gas mass fraction are presented in a companion paper.

Original languageEnglish (US)
Pages (from-to)2341-2380
Number of pages40
JournalAstronomical Journal
Volume122
Issue number5
DOIs
StatePublished - Nov 1 2001

Keywords

  • Galaxies: ISM
  • Galaxies: abundances
  • Galaxies: fundamental parameters
  • Galaxies: general
  • Galaxies: nuclei
  • Galaxies: stellar content

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'High and low surface brightness galaxies in the local universe. IV. Optical and 21 centimeter spectroscopy'. Together they form a unique fingerprint.

  • Cite this