A Nuclear Ionized Gas Outflow in the Seyfert 2 Galaxy UGC 2024
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 10(5) M-circle dot and 4 x 10(7) M-circle dot km s(-1), respectively, or a dispersion supported halo created by a past nuclear starburst.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 06, 2019
- Accession Number
- AD1099194
Entities
People
- Allan Schnorr-muller
- Andrew Robinson
- Carolina Finlez
- D. M. Crenshaw
- Dania Munoz-vergara
- Davide Lena
- Henrique R. Schmitt
- Martin Elvis
- Neil M. Nagar
- Pamela Soto-pinto
- Pedro K. Humire
- Rogemar A. Riffel
- Roy Slater
- S. B. Kraemer
- T. C. Fischer
- Thaisa Storchi-bergmann
- Venkatessh Ramakrishnan
- Veronica Firpo
Organizations
- United States Naval Research Laboratory