Accession Number:

AD1099194

Title:

A Nuclear Ionized Gas Outflow in the Seyfert 2 Galaxy UGC 2024

Descriptive Note:

Journal Article - Open Access

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States

Report Date:

2019-06-06

Pagination or Media Count:

14.0

Abstract:

As part of a high-resolution observational study of feeding and feedback processes occurring in the vicinity of the active galactic nucleus in 40 galaxies, we observed the inner 3.5 x 5 arcsec of the nearby spiral and Seyfert 2 galaxy UGC 2024 with the integral field unit of the Gemini-South Telescope. The observations enabled a study of the stellar and gas kinematics in this region at a spatial resolution of 0.5 218 pc, and a spectral resolution of 36 km s-1 over the wavelength range 4100-7300 A. For the strongest emission-lines H beta, O III lambda5007 A. H alpha, N III lambda6584 A, and S II lambda lambda 6717,6731 angstrom we derived maps of the flux, radial velocity, and velocity dispersion. The flux distribution and kinematics of the O III emission line are roughly symmetric around the nucleus the radial velocity is close to systemic over the full field of view. The kinematics of the other strong emission lines trace both this systemic velocity component, and ordered rotation with kinematic centre 0.2 north-west of the nucleus, The stellar continuum morphology and kinematics are, however, asymmetrical around the nucleus. We interpret these unusual kinematics as the superposition of a component of gas rotating in the galaxy disc plus a halo component of highly ionized gas. This halo either traces a quasi-spherical fountain with average radial velocity 200 km s-1, in which case the total nuclear outflow mass and momentum are 2 x 105 M-circle dot and 4 x 107 M-circle dot km s-1, respectively, or a dispersion supported halo created by a past nuclear starburst.

Subject Categories:

  • Astronomy
  • Astrophysics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE