Atomic hydrogen properties of active galactic nuclei host galaxies: H i in 16 NUclei of GAlaxies (NUGA) sources

Sebastian Haan, Eva Schinnerer, Carole G. Mundell, Santiago García-Burillo, Francoise Combes

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

We present a comprehensive spectroscopic imaging survey of the distribution and kinematics of atomic hydrogen (H I) in 16 nearby spiral galaxies hosting low luminosity active galactic nuclei (AGN), observed with high spectral and spatial resolution (resolution: 20″, 5 km s-1) using the NRAO Very Large Array (VLA). The sample contains a range of nuclear types ranging from Seyfert to star-forming nuclei, and was originally selected for the NUclei of GAlaxies project (NUGA) - a spectrally and spatially resolved interferometric survey of gas dynamics in nearby galaxies designed to identify the fueling mechanisms of AGN and the relation to host galaxy evolution. Here we investigate the relationship between the H I properties of these galaxies, their environment, their stellar distribution, and their AGN type. The large-scale H I morphology of each galaxy is classified as ringed, spiral, or centrally concentrated; comparison of the resulting morphological classification with the AGN type reveals that ring structures are significantly more common in low-ionization narrow emission-line regions (LINER) than in Seyfert host galaxies, suggesting a time evolution of the AGN activity together with the redistribution of the neutral gas. Dynamically disturbed H I disks are also more prevalent in LINER host galaxies than in Seyfert host galaxies. While several galaxies are surrounded by companions (some with associated H I emission), there is no correlation between the presence of companions and the AGN type (Seyfert/LINER).

Original languageEnglish
Pages (from-to)232-257
Number of pages26
JournalAstronomical Journal
Volume135
Issue number1
DOIs
Publication statusPublished - 7 Dec 2007

Keywords

  • Galaxies: active
  • Galaxies: kinematics and dynamics
  • Galaxies: Seyfert
  • Radio lines: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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