High-resolution near-infrared spectra of NGC 4151: Line and continuum analysis

Rodger I. Thompson

doi:10.1086/175732

High-resolution near-infrared spectra of NGC 4151: Line and continuum analysis

Rodger I. Thompson

Astronomy

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

Abstract

This paper presents new high-resolution near-infrared spectra of the Seyfert 1.5 galaxy NGC 4151. These spectra are the first high-resolution infrared spectra of this galaxy that span the region from 0.87 to 2.5 μm. Analysis of the extensive [Fe II] emission yields electron temperatures and densities consistent with 10⁴ K and 10⁴ cm^-3 for the Fe II emission-line regions. The high ratio of [Fe II] emission to hydrogen indicates that the majority of Fe is in gaseous form. Analysis of the H₂ emission indicates that the emission is proably shock excited and that the H₂ lines have narrower emission-line widths than the observed [S III] narrow-line emission. NGC 4151 appears to have been in a state of high continuum and broad line flux during the observation period; therefore, the equivalent width of some of the narrow line components is lower than in previous observations.

Original language	English (US)
Pages (from-to)	700-711
Number of pages	12
Journal	Astrophysical Journal
Volume	445
Issue number	2
DOIs	https://doi.org/10.1086/175732
State	Published - Jun 1 1995

Keywords

Galaxies: ISM
Galaxies: Seyfert
Galaxies: active
Galaxies: individual (NGC 4151)
Infrared: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1086/175732

Cite this

@article{122e70a2a6484e1583d8f57ea1aa046a,

title = "High-resolution near-infrared spectra of NGC 4151: Line and continuum analysis",

abstract = "This paper presents new high-resolution near-infrared spectra of the Seyfert 1.5 galaxy NGC 4151. These spectra are the first high-resolution infrared spectra of this galaxy that span the region from 0.87 to 2.5 μm. Analysis of the extensive [Fe II] emission yields electron temperatures and densities consistent with 104 K and 104 cm-3 for the Fe II emission-line regions. The high ratio of [Fe II] emission to hydrogen indicates that the majority of Fe is in gaseous form. Analysis of the H2 emission indicates that the emission is proably shock excited and that the H2 lines have narrower emission-line widths than the observed [S III] narrow-line emission. NGC 4151 appears to have been in a state of high continuum and broad line flux during the observation period; therefore, the equivalent width of some of the narrow line components is lower than in previous observations.",

keywords = "Galaxies: ISM, Galaxies: Seyfert, Galaxies: active, Galaxies: individual (NGC 4151), Infrared: galaxies",

author = "Thompson, {Rodger I.}",

year = "1995",

month = jun,

day = "1",

doi = "10.1086/175732",

language = "English (US)",

volume = "445",

pages = "700--711",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "2",

}

TY - JOUR

T1 - High-resolution near-infrared spectra of NGC 4151

T2 - Line and continuum analysis

AU - Thompson, Rodger I.

PY - 1995/6/1

Y1 - 1995/6/1

N2 - This paper presents new high-resolution near-infrared spectra of the Seyfert 1.5 galaxy NGC 4151. These spectra are the first high-resolution infrared spectra of this galaxy that span the region from 0.87 to 2.5 μm. Analysis of the extensive [Fe II] emission yields electron temperatures and densities consistent with 104 K and 104 cm-3 for the Fe II emission-line regions. The high ratio of [Fe II] emission to hydrogen indicates that the majority of Fe is in gaseous form. Analysis of the H2 emission indicates that the emission is proably shock excited and that the H2 lines have narrower emission-line widths than the observed [S III] narrow-line emission. NGC 4151 appears to have been in a state of high continuum and broad line flux during the observation period; therefore, the equivalent width of some of the narrow line components is lower than in previous observations.

AB - This paper presents new high-resolution near-infrared spectra of the Seyfert 1.5 galaxy NGC 4151. These spectra are the first high-resolution infrared spectra of this galaxy that span the region from 0.87 to 2.5 μm. Analysis of the extensive [Fe II] emission yields electron temperatures and densities consistent with 104 K and 104 cm-3 for the Fe II emission-line regions. The high ratio of [Fe II] emission to hydrogen indicates that the majority of Fe is in gaseous form. Analysis of the H2 emission indicates that the emission is proably shock excited and that the H2 lines have narrower emission-line widths than the observed [S III] narrow-line emission. NGC 4151 appears to have been in a state of high continuum and broad line flux during the observation period; therefore, the equivalent width of some of the narrow line components is lower than in previous observations.

KW - Galaxies: ISM

KW - Galaxies: Seyfert

KW - Galaxies: active

KW - Galaxies: individual (NGC 4151)

KW - Infrared: galaxies

UR - http://www.scopus.com/inward/record.url?scp=11944266979&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=11944266979&partnerID=8YFLogxK

U2 - 10.1086/175732

DO - 10.1086/175732

M3 - Article

AN - SCOPUS:11944266979

SN - 0004-637X

VL - 445

SP - 700

EP - 711

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

High-resolution near-infrared spectra of NGC 4151: Line and continuum analysis

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this