The kinematics of the extended gas in the Seyfert galaxy NGC 3516

John S. Mulchaey, Zlatan Tsvetanov, Andrew S. Wilson, Ismael Pérez-Fournon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Long-slit spectroscopy of the extended gas in the Seyfert galaxy NGC 3516 reveals considerable substructure in the narrow emission lines with several kinematically distinct components visible in Ha and [N II] λ6583. Our velocity measurements cover almost all of the 3 kpc scale, Z-shaped emission-line structure seen in narrow-band images and suggest that a significant rotational component is present. At large radii, strong deviations from this rotation are observed, indicating that a radial component of motion to the gas is also required to adequately describe the velocity field. There is a clear antisymmetry in these deviations with the velocities being blueshifted with respect to "normal" galactic rotation on the southwest side of the nucleus and redshifted with respect to it on the northeast side. Although several models can be invoked to explain the observed velocities, the symmetries in the kinematics and emission-line morphology are most easily explained by a bent bipolar mass outflow from the nucleus. In this simple model, gas is ejected out of the plane of the stellar disk and is then slowed by gravitational forces. As the gas trajectory begins to bend, significant velocity deviations are produced. These observations provide some of the best kinematic evidence for mass outflow, although indirect arguments suggest they may be a common feature in many Seyfert galaxies.

Original languageEnglish
Pages (from-to)91-97
Number of pages7
JournalAstrophysical Journal
Volume394
Issue number1
Publication statusPublished - 1992
Externally publishedYes

Fingerprint

Seyfert galaxies
kinematics
deviation
gases
gas
galactic rotation
antisymmetry
outflow
nuclei
substructures
velocity measurement
slits
narrowband
velocity distribution
trajectories
symmetry
radii
trajectory
spectroscopy

Keywords

  • Galaxies: Individual (NGC 3516)
  • Galaxies: Kinematics and dynamics
  • Galaxies: Seyfert

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Space and Planetary Science

Cite this

Mulchaey, J. S., Tsvetanov, Z., Wilson, A. S., & Pérez-Fournon, I. (1992). The kinematics of the extended gas in the Seyfert galaxy NGC 3516. Astrophysical Journal, 394(1), 91-97.

The kinematics of the extended gas in the Seyfert galaxy NGC 3516. / Mulchaey, John S.; Tsvetanov, Zlatan; Wilson, Andrew S.; Pérez-Fournon, Ismael.

In: Astrophysical Journal, Vol. 394, No. 1, 1992, p. 91-97.

Research output: Contribution to journalArticle

Mulchaey, JS, Tsvetanov, Z, Wilson, AS & Pérez-Fournon, I 1992, 'The kinematics of the extended gas in the Seyfert galaxy NGC 3516', Astrophysical Journal, vol. 394, no. 1, pp. 91-97.
Mulchaey, John S. ; Tsvetanov, Zlatan ; Wilson, Andrew S. ; Pérez-Fournon, Ismael. / The kinematics of the extended gas in the Seyfert galaxy NGC 3516. In: Astrophysical Journal. 1992 ; Vol. 394, No. 1. pp. 91-97.
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