Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy

Edward J M Colbert, Stefi A. Baum, Jack F. Gallimore, Christopher P. O'Dea, Matthew D. Lehnert, Zlatan Tsvetanov, John S. Mulchaey, Saul Caganoff

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

We have launched a search for large-scale (≳ 1 kpc) minor axis outflows in edge-on Seyfert galaxies in order to assess their frequency of occurrence and to study their properties. Here we present optical continuum and Hα + [N II] line images and/or minor axis long-slit spectra of 22 edge-on Seyfert galaxies. Six of these galaxies show at least one of the following: (i) bi-symmetric Hα halos extending along the minor axis, (ii) bright emission-line complexes at distances ≳4 kpc (in projection) out of the disk, and (iii) double-peaked emission-line profiles from the gas along the minor axis, suggesting that a windblown bubble is present. Our results indicate that ≳1/4 of Seyfert galaxies have good evidence for minor axis galactic outflows. Kinetic luminosities of the galactic outflows in our sample Seyfert galaxies are ∼1040-1042 ergs s-1, assuming all the observed minor axis emission is produced by the outflow. These values are, in general, ∼0.1 as large as those well-studied cases of superwinds in starburst galaxies (Heckman, Armus, & Miley 1990). However, far-infrared luminosities of our sample Seyfert galaxies are also ∼0.1 as large. Both starburst-driven superwinds and wide-angled outflows from the active galactic nucleus are possible explanations for the observed large-scale outflows.

Original languageEnglish
Pages (from-to)75-92
Number of pages18
JournalAstrophysical Journal, Supplement Series
Volume105
Issue number1
DOIs
Publication statusPublished - Jul 1996
Externally publishedYes

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Seyfert galaxies
light emission
outflow
spectroscopy
luminosity
starburst galaxies
active galactic nuclei
erg
slits
bubble
halos
bubbles
projection
occurrences
galaxies
continuums
kinetics
profiles
gases
gas

Keywords

  • Cooling flows
  • Galaxies: ISM
  • Galaxies: kinematics and dynamics
  • Galaxies: Seyfert

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy. / Colbert, Edward J M; Baum, Stefi A.; Gallimore, Jack F.; O'Dea, Christopher P.; Lehnert, Matthew D.; Tsvetanov, Zlatan; Mulchaey, John S.; Caganoff, Saul.

In: Astrophysical Journal, Supplement Series, Vol. 105, No. 1, 07.1996, p. 75-92.

Research output: Contribution to journalArticle

Colbert, EJM, Baum, SA, Gallimore, JF, O'Dea, CP, Lehnert, MD, Tsvetanov, Z, Mulchaey, JS & Caganoff, S 1996, 'Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy', Astrophysical Journal, Supplement Series, vol. 105, no. 1, pp. 75-92. https://doi.org/10.1086/192307
Colbert, Edward J M ; Baum, Stefi A. ; Gallimore, Jack F. ; O'Dea, Christopher P. ; Lehnert, Matthew D. ; Tsvetanov, Zlatan ; Mulchaey, John S. ; Caganoff, Saul. / Large-scale outflows in edge-on Seyfert galaxies. I. Optical emission-line imaging and optical spectroscopy. In: Astrophysical Journal, Supplement Series. 1996 ; Vol. 105, No. 1. pp. 75-92.
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AB - We have launched a search for large-scale (≳ 1 kpc) minor axis outflows in edge-on Seyfert galaxies in order to assess their frequency of occurrence and to study their properties. Here we present optical continuum and Hα + [N II] line images and/or minor axis long-slit spectra of 22 edge-on Seyfert galaxies. Six of these galaxies show at least one of the following: (i) bi-symmetric Hα halos extending along the minor axis, (ii) bright emission-line complexes at distances ≳4 kpc (in projection) out of the disk, and (iii) double-peaked emission-line profiles from the gas along the minor axis, suggesting that a windblown bubble is present. Our results indicate that ≳1/4 of Seyfert galaxies have good evidence for minor axis galactic outflows. Kinetic luminosities of the galactic outflows in our sample Seyfert galaxies are ∼1040-1042 ergs s-1, assuming all the observed minor axis emission is produced by the outflow. These values are, in general, ∼0.1 as large as those well-studied cases of superwinds in starburst galaxies (Heckman, Armus, & Miley 1990). However, far-infrared luminosities of our sample Seyfert galaxies are also ∼0.1 as large. Both starburst-driven superwinds and wide-angled outflows from the active galactic nucleus are possible explanations for the observed large-scale outflows.

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