The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber

Jack Gabel, D. Michael Crenshaw, Steven B. Kraemer, W. N. Brandt, Ian M. George, Frederick W. Hamann, Mary Elizabeth Kaiser, Shai Kaspi, Gerard A. Kriss, Smita Mathur, Richard F. Mushotzky, Klrpal Nandra, Hagai Netzer, Bradley M. Peterson, Joseph C. Shields, T. J. Turner, Wei Zheng

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We report an intrinsic absorber with decreasing outflow velocity in the Seyfert 1 galaxy NGC 3783. This is the first detection of a change in radial velocity in an outflow associated with a Seyfert galaxy. These results are based on measurements from 18 observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope, obtained between 2000 February and 2002 January. In two intervals separated by ∼13 and 9 months, the absorption lines in the kinematic component with highest outflow velocity exhibited mean redward velocity shifts of ∼35 and 55 km s1, respectively. The rate of velocity decrease was 2.2 ± 0.6 times more rapid in the second interval. No variations in absorption velocities were detected in the other kinematic components. We explore potential interpretations of the observed velocity shifts: radial deceleration of the UV absorber due to a change in either the speed or direction of motion of the outflow, and the evolution of a continuous flow across our line of sight to the emission source.

Original languageEnglish
Pages (from-to)120-126
Number of pages7
JournalAstrophysical Journal
Volume595
Issue number1 I
DOIs
StatePublished - Sep 20 2003
Externally publishedYes

Fingerprint

ionized gases
radial velocity
absorbers
gas
outflow
kinematics
intervals
Seyfert galaxies
shift
deceleration
detection
Hubble Space Telescope
line of sight
spectrographs
telescopes
galaxies

All Science Journal Classification (ASJC) codes

  • Space and Planetary Science
  • Nuclear and High Energy Physics

Cite this

The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber. / Gabel, Jack; Michael Crenshaw, D.; Kraemer, Steven B.; Brandt, W. N.; George, Ian M.; Hamann, Frederick W.; Kaiser, Mary Elizabeth; Kaspi, Shai; Kriss, Gerard A.; Mathur, Smita; Mushotzky, Richard F.; Nandra, Klrpal; Netzer, Hagai; Peterson, Bradley M.; Shields, Joseph C.; Turner, T. J.; Zheng, Wei.

In: Astrophysical Journal, Vol. 595, No. 1 I, 20.09.2003, p. 120-126.

Research output: Contribution to journalArticle

Gabel, J, Michael Crenshaw, D, Kraemer, SB, Brandt, WN, George, IM, Hamann, FW, Kaiser, ME, Kaspi, S, Kriss, GA, Mathur, S, Mushotzky, RF, Nandra, K, Netzer, H, Peterson, BM, Shields, JC, Turner, TJ & Zheng, W 2003, 'The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber', Astrophysical Journal, vol. 595, no. 1 I, pp. 120-126. https://doi.org/10.1086/377342
Gabel, Jack ; Michael Crenshaw, D. ; Kraemer, Steven B. ; Brandt, W. N. ; George, Ian M. ; Hamann, Frederick W. ; Kaiser, Mary Elizabeth ; Kaspi, Shai ; Kriss, Gerard A. ; Mathur, Smita ; Mushotzky, Richard F. ; Nandra, Klrpal ; Netzer, Hagai ; Peterson, Bradley M. ; Shields, Joseph C. ; Turner, T. J. ; Zheng, Wei. / The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber. In: Astrophysical Journal. 2003 ; Vol. 595, No. 1 I. pp. 120-126.
@article{3ec89644715348ff8a24bd0f950d1bc7,
title = "The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber",
abstract = "We report an intrinsic absorber with decreasing outflow velocity in the Seyfert 1 galaxy NGC 3783. This is the first detection of a change in radial velocity in an outflow associated with a Seyfert galaxy. These results are based on measurements from 18 observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope, obtained between 2000 February and 2002 January. In two intervals separated by ∼13 and 9 months, the absorption lines in the kinematic component with highest outflow velocity exhibited mean redward velocity shifts of ∼35 and 55 km s1, respectively. The rate of velocity decrease was 2.2 ± 0.6 times more rapid in the second interval. No variations in absorption velocities were detected in the other kinematic components. We explore potential interpretations of the observed velocity shifts: radial deceleration of the UV absorber due to a change in either the speed or direction of motion of the outflow, and the evolution of a continuous flow across our line of sight to the emission source.",
author = "Jack Gabel and {Michael Crenshaw}, D. and Kraemer, {Steven B.} and Brandt, {W. N.} and George, {Ian M.} and Hamann, {Frederick W.} and Kaiser, {Mary Elizabeth} and Shai Kaspi and Kriss, {Gerard A.} and Smita Mathur and Mushotzky, {Richard F.} and Klrpal Nandra and Hagai Netzer and Peterson, {Bradley M.} and Shields, {Joseph C.} and Turner, {T. J.} and Wei Zheng",
year = "2003",
month = "9",
day = "20",
doi = "10.1086/377342",
language = "English",
volume = "595",
pages = "120--126",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 I",

}

TY - JOUR

T1 - The Ionized Gas and Nuclear Environment in NGC 3783. III. Detection of a Decreasing Radial Velocity in an Intrinsic Ultraviolet Absorber

AU - Gabel, Jack

AU - Michael Crenshaw, D.

AU - Kraemer, Steven B.

AU - Brandt, W. N.

AU - George, Ian M.

AU - Hamann, Frederick W.

AU - Kaiser, Mary Elizabeth

AU - Kaspi, Shai

AU - Kriss, Gerard A.

AU - Mathur, Smita

AU - Mushotzky, Richard F.

AU - Nandra, Klrpal

AU - Netzer, Hagai

AU - Peterson, Bradley M.

AU - Shields, Joseph C.

AU - Turner, T. J.

AU - Zheng, Wei

PY - 2003/9/20

Y1 - 2003/9/20

N2 - We report an intrinsic absorber with decreasing outflow velocity in the Seyfert 1 galaxy NGC 3783. This is the first detection of a change in radial velocity in an outflow associated with a Seyfert galaxy. These results are based on measurements from 18 observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope, obtained between 2000 February and 2002 January. In two intervals separated by ∼13 and 9 months, the absorption lines in the kinematic component with highest outflow velocity exhibited mean redward velocity shifts of ∼35 and 55 km s1, respectively. The rate of velocity decrease was 2.2 ± 0.6 times more rapid in the second interval. No variations in absorption velocities were detected in the other kinematic components. We explore potential interpretations of the observed velocity shifts: radial deceleration of the UV absorber due to a change in either the speed or direction of motion of the outflow, and the evolution of a continuous flow across our line of sight to the emission source.

AB - We report an intrinsic absorber with decreasing outflow velocity in the Seyfert 1 galaxy NGC 3783. This is the first detection of a change in radial velocity in an outflow associated with a Seyfert galaxy. These results are based on measurements from 18 observations with the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope, obtained between 2000 February and 2002 January. In two intervals separated by ∼13 and 9 months, the absorption lines in the kinematic component with highest outflow velocity exhibited mean redward velocity shifts of ∼35 and 55 km s1, respectively. The rate of velocity decrease was 2.2 ± 0.6 times more rapid in the second interval. No variations in absorption velocities were detected in the other kinematic components. We explore potential interpretations of the observed velocity shifts: radial deceleration of the UV absorber due to a change in either the speed or direction of motion of the outflow, and the evolution of a continuous flow across our line of sight to the emission source.

UR - http://www.scopus.com/inward/record.url?scp=2442698743&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2442698743&partnerID=8YFLogxK

U2 - 10.1086/377342

DO - 10.1086/377342

M3 - Article

VL - 595

SP - 120

EP - 126

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 I

ER -