A radio study of the Seyfert galaxy IC 5063

Evidence for fast gas outflow

R. Morganti, T. Oosterloo, Zlatan Tsvetanov

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

We present new radio continuum (8 and 1.4 GHz) and H I 21 cm line observations of the Seyfert 2 galaxy IC 5063 (PKS 2048-572), obtained with the Australia Telescope Compact Array. The high-resolution 8 GHz image reveals a linear triple structure ∼4″ (1.3 kpc) in size. This small-scale radio emission shows a strong morphological association with the narrow-line region (NLR), the inner part of the optical emission-line region. It is aligned with the inner dust lane and is oriented perpendicularly to the position angle of the optical polarization. We identify the radio nucleus as the central blob of the radio emission. At 21 cm, very broad (∼700 km s-1) H I absorption is observed against the strong continuum source. This absorption is almost entirely blueshifted, indicating a fast net outflow, but a faint and narrow redshifted component is also present. In IC 5063 we see clear evidence, both morphological and kinematic, of strong shocks resulting from the interaction between the radio plasma and the interstellar medium (ISM) in the central few kiloparsecs. However, we estimate the energy flux in the radio plasma to be an order of magnitude smaller than the energy flux emitted in emission lines. Thus, although strong shocks associated with the jet/ISM interaction occur, and could contribute locally to the ionization of the NLR, they are unlikely to account solely for the global ionization of the emission-line region, particularly at large distances. The main structure of the H I emission is a warped disk associated with the system of dust lanes of R ∼ 2′ (∼ 38 kpc, corresponding to ∼5 effective radii). The lack of kinematically disturbed gas (both neutral and ionized) outside the central few kiloparsecs, the warped structure of the large-scale disk, and the close morphological connection between the inner dust lanes and the large-scale ionized gas all support the idea that the gas at large radii is photoionized by the central region, while shadowing effects are important in defining its X-shaped morphology. From the kinematics of the ionized and neutral gas, we find evidence for a dark halo in IC 5063, with properties very similar to those observed in some other early-type galaxies.

Original languageEnglish
Pages (from-to)915-927
Number of pages13
JournalAstronomical Journal
Volume115
Issue number3
Publication statusPublished - Mar 1998
Externally publishedYes

Fingerprint

Seyfert galaxies
ionized gases
outflow
dust
neutral gases
radio
radio emission
kinematics
shock
gases
gas
galaxies
continuums
ionization
radii
optical polarization
energy flux
light emission
halos
interactions

Keywords

  • Galaxies: individual (IC 5063)
  • Galaxies: ISM
  • Galaxies: nuclei
  • Galaxies: Seyfert

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A radio study of the Seyfert galaxy IC 5063 : Evidence for fast gas outflow. / Morganti, R.; Oosterloo, T.; Tsvetanov, Zlatan.

In: Astronomical Journal, Vol. 115, No. 3, 03.1998, p. 915-927.

Research output: Contribution to journalArticle

@article{6e775dca0753431d8ad9f1745bc18e80,
title = "A radio study of the Seyfert galaxy IC 5063: Evidence for fast gas outflow",
abstract = "We present new radio continuum (8 and 1.4 GHz) and H I 21 cm line observations of the Seyfert 2 galaxy IC 5063 (PKS 2048-572), obtained with the Australia Telescope Compact Array. The high-resolution 8 GHz image reveals a linear triple structure ∼4″ (1.3 kpc) in size. This small-scale radio emission shows a strong morphological association with the narrow-line region (NLR), the inner part of the optical emission-line region. It is aligned with the inner dust lane and is oriented perpendicularly to the position angle of the optical polarization. We identify the radio nucleus as the central blob of the radio emission. At 21 cm, very broad (∼700 km s-1) H I absorption is observed against the strong continuum source. This absorption is almost entirely blueshifted, indicating a fast net outflow, but a faint and narrow redshifted component is also present. In IC 5063 we see clear evidence, both morphological and kinematic, of strong shocks resulting from the interaction between the radio plasma and the interstellar medium (ISM) in the central few kiloparsecs. However, we estimate the energy flux in the radio plasma to be an order of magnitude smaller than the energy flux emitted in emission lines. Thus, although strong shocks associated with the jet/ISM interaction occur, and could contribute locally to the ionization of the NLR, they are unlikely to account solely for the global ionization of the emission-line region, particularly at large distances. The main structure of the H I emission is a warped disk associated with the system of dust lanes of R ∼ 2′ (∼ 38 kpc, corresponding to ∼5 effective radii). The lack of kinematically disturbed gas (both neutral and ionized) outside the central few kiloparsecs, the warped structure of the large-scale disk, and the close morphological connection between the inner dust lanes and the large-scale ionized gas all support the idea that the gas at large radii is photoionized by the central region, while shadowing effects are important in defining its X-shaped morphology. From the kinematics of the ionized and neutral gas, we find evidence for a dark halo in IC 5063, with properties very similar to those observed in some other early-type galaxies.",
keywords = "Galaxies: individual (IC 5063), Galaxies: ISM, Galaxies: nuclei, Galaxies: Seyfert",
author = "R. Morganti and T. Oosterloo and Zlatan Tsvetanov",
year = "1998",
month = "3",
language = "English",
volume = "115",
pages = "915--927",
journal = "Astronomical Journal",
issn = "0004-6256",
publisher = "IOP Publishing Ltd.",
number = "3",

}

TY - JOUR

T1 - A radio study of the Seyfert galaxy IC 5063

T2 - Evidence for fast gas outflow

AU - Morganti, R.

AU - Oosterloo, T.

AU - Tsvetanov, Zlatan

PY - 1998/3

Y1 - 1998/3

N2 - We present new radio continuum (8 and 1.4 GHz) and H I 21 cm line observations of the Seyfert 2 galaxy IC 5063 (PKS 2048-572), obtained with the Australia Telescope Compact Array. The high-resolution 8 GHz image reveals a linear triple structure ∼4″ (1.3 kpc) in size. This small-scale radio emission shows a strong morphological association with the narrow-line region (NLR), the inner part of the optical emission-line region. It is aligned with the inner dust lane and is oriented perpendicularly to the position angle of the optical polarization. We identify the radio nucleus as the central blob of the radio emission. At 21 cm, very broad (∼700 km s-1) H I absorption is observed against the strong continuum source. This absorption is almost entirely blueshifted, indicating a fast net outflow, but a faint and narrow redshifted component is also present. In IC 5063 we see clear evidence, both morphological and kinematic, of strong shocks resulting from the interaction between the radio plasma and the interstellar medium (ISM) in the central few kiloparsecs. However, we estimate the energy flux in the radio plasma to be an order of magnitude smaller than the energy flux emitted in emission lines. Thus, although strong shocks associated with the jet/ISM interaction occur, and could contribute locally to the ionization of the NLR, they are unlikely to account solely for the global ionization of the emission-line region, particularly at large distances. The main structure of the H I emission is a warped disk associated with the system of dust lanes of R ∼ 2′ (∼ 38 kpc, corresponding to ∼5 effective radii). The lack of kinematically disturbed gas (both neutral and ionized) outside the central few kiloparsecs, the warped structure of the large-scale disk, and the close morphological connection between the inner dust lanes and the large-scale ionized gas all support the idea that the gas at large radii is photoionized by the central region, while shadowing effects are important in defining its X-shaped morphology. From the kinematics of the ionized and neutral gas, we find evidence for a dark halo in IC 5063, with properties very similar to those observed in some other early-type galaxies.

AB - We present new radio continuum (8 and 1.4 GHz) and H I 21 cm line observations of the Seyfert 2 galaxy IC 5063 (PKS 2048-572), obtained with the Australia Telescope Compact Array. The high-resolution 8 GHz image reveals a linear triple structure ∼4″ (1.3 kpc) in size. This small-scale radio emission shows a strong morphological association with the narrow-line region (NLR), the inner part of the optical emission-line region. It is aligned with the inner dust lane and is oriented perpendicularly to the position angle of the optical polarization. We identify the radio nucleus as the central blob of the radio emission. At 21 cm, very broad (∼700 km s-1) H I absorption is observed against the strong continuum source. This absorption is almost entirely blueshifted, indicating a fast net outflow, but a faint and narrow redshifted component is also present. In IC 5063 we see clear evidence, both morphological and kinematic, of strong shocks resulting from the interaction between the radio plasma and the interstellar medium (ISM) in the central few kiloparsecs. However, we estimate the energy flux in the radio plasma to be an order of magnitude smaller than the energy flux emitted in emission lines. Thus, although strong shocks associated with the jet/ISM interaction occur, and could contribute locally to the ionization of the NLR, they are unlikely to account solely for the global ionization of the emission-line region, particularly at large distances. The main structure of the H I emission is a warped disk associated with the system of dust lanes of R ∼ 2′ (∼ 38 kpc, corresponding to ∼5 effective radii). The lack of kinematically disturbed gas (both neutral and ionized) outside the central few kiloparsecs, the warped structure of the large-scale disk, and the close morphological connection between the inner dust lanes and the large-scale ionized gas all support the idea that the gas at large radii is photoionized by the central region, while shadowing effects are important in defining its X-shaped morphology. From the kinematics of the ionized and neutral gas, we find evidence for a dark halo in IC 5063, with properties very similar to those observed in some other early-type galaxies.

KW - Galaxies: individual (IC 5063)

KW - Galaxies: ISM

KW - Galaxies: nuclei

KW - Galaxies: Seyfert

UR - http://www.scopus.com/inward/record.url?scp=0000134001&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000134001&partnerID=8YFLogxK

M3 - Article

VL - 115

SP - 915

EP - 927

JO - Astronomical Journal

JF - Astronomical Journal

SN - 0004-6256

IS - 3

ER -