Shocked gas in IRAS F17207-0014: ISM collisions and outflows

Anne M. Medling; U. Vivian; Jeffrey A. Rich; Lisa J. Kewley; Lee Armus; Michael A. Dopita; Claire E. Max; David Sanders; Ralph Sutherland

doi:10.1093/mnras/stv081

Shocked gas in IRAS F17207-0014: ISM collisions and outflows

Anne M. Medling^*, U. Vivian, Jeffrey A. Rich, Lisa J. Kewley, Lee Armus, Michael A. Dopita, Claire E. Max, David Sanders, Ralph Sutherland

^*Corresponding author for this work

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

27 Citations (Scopus)

Abstract

We combine optical and near-infrared adaptive optics-assisted integral field observations of the merging ultraluminous infrared galaxies IRAS F17207-0014 from the Wide-Field Spectrograph and Keck/OH-Suppressing Infra-Red Imaging Spectrograph (OSIRIS). The optical emission line ratios [NII]/Hα, [SII]/Hα, and [O I]/Hα reveal a mixing sequence of shocks present throughout the galaxy, with the strongest contributions coming from large radii (up to 100 per cent at ~5 kpc in some directions), suggesting galactic-scale winds. The near-infrared observations, which have approximately 30 times higher spatial resolution, show that two sorts of shocks are present in the vicinity of the merging nuclei: low-level shocks distributed throughout our field-of-view evidenced by an H₂/Brγ line ratio of ~0.6-4, and strong collimated shocks with a high H₂/Brγ line ratio of ~4-8, extending south from the two nuclear discs approximately 400 pc (~0.5 arcsec). Our data suggest that the diffuse shocks are caused by the collision of the interstellar media associated with the two progenitor galaxies and the strong shocks trace the base of a collimated outflow coming from the nucleus of one of the two discs.

Original language	English
Pages (from-to)	2301-2311
Number of pages	11
Journal	Monthly Notices of the Royal Astronomical Society
Volume	448
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stv081
Publication status	Published - 11 Apr 2015

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title = "Shocked gas in IRAS F17207-0014: ISM collisions and outflows",

abstract = "We combine optical and near-infrared adaptive optics-assisted integral field observations of the merging ultraluminous infrared galaxies IRAS F17207-0014 from the Wide-Field Spectrograph and Keck/OH-Suppressing Infra-Red Imaging Spectrograph (OSIRIS). The optical emission line ratios [NII]/Hα, [SII]/Hα, and [O I]/Hα reveal a mixing sequence of shocks present throughout the galaxy, with the strongest contributions coming from large radii (up to 100 per cent at ~5 kpc in some directions), suggesting galactic-scale winds. The near-infrared observations, which have approximately 30 times higher spatial resolution, show that two sorts of shocks are present in the vicinity of the merging nuclei: low-level shocks distributed throughout our field-of-view evidenced by an H2/Brγ line ratio of ~0.6-4, and strong collimated shocks with a high H2/Brγ line ratio of ~4-8, extending south from the two nuclear discs approximately 400 pc (~0.5 arcsec). Our data suggest that the diffuse shocks are caused by the collision of the interstellar media associated with the two progenitor galaxies and the strong shocks trace the base of a collimated outflow coming from the nucleus of one of the two discs.",

keywords = "Galaxies: interactions, Galaxies: kinematics and dynamics, Galaxies: nuclei",

author = "Medling, {Anne M.} and U. Vivian and Rich, {Jeffrey A.} and Kewley, {Lisa J.} and Lee Armus and Dopita, {Michael A.} and Max, {Claire E.} and David Sanders and Ralph Sutherland",

note = "Publisher Copyright: {\textcopyright} 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.",

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T2 - ISM collisions and outflows

AU - Medling, Anne M.

AU - Vivian, U.

AU - Rich, Jeffrey A.

AU - Kewley, Lisa J.

AU - Armus, Lee

AU - Dopita, Michael A.

AU - Max, Claire E.

AU - Sanders, David

AU - Sutherland, Ralph

PY - 2015/4/11

Y1 - 2015/4/11

N2 - We combine optical and near-infrared adaptive optics-assisted integral field observations of the merging ultraluminous infrared galaxies IRAS F17207-0014 from the Wide-Field Spectrograph and Keck/OH-Suppressing Infra-Red Imaging Spectrograph (OSIRIS). The optical emission line ratios [NII]/Hα, [SII]/Hα, and [O I]/Hα reveal a mixing sequence of shocks present throughout the galaxy, with the strongest contributions coming from large radii (up to 100 per cent at ~5 kpc in some directions), suggesting galactic-scale winds. The near-infrared observations, which have approximately 30 times higher spatial resolution, show that two sorts of shocks are present in the vicinity of the merging nuclei: low-level shocks distributed throughout our field-of-view evidenced by an H2/Brγ line ratio of ~0.6-4, and strong collimated shocks with a high H2/Brγ line ratio of ~4-8, extending south from the two nuclear discs approximately 400 pc (~0.5 arcsec). Our data suggest that the diffuse shocks are caused by the collision of the interstellar media associated with the two progenitor galaxies and the strong shocks trace the base of a collimated outflow coming from the nucleus of one of the two discs.

AB - We combine optical and near-infrared adaptive optics-assisted integral field observations of the merging ultraluminous infrared galaxies IRAS F17207-0014 from the Wide-Field Spectrograph and Keck/OH-Suppressing Infra-Red Imaging Spectrograph (OSIRIS). The optical emission line ratios [NII]/Hα, [SII]/Hα, and [O I]/Hα reveal a mixing sequence of shocks present throughout the galaxy, with the strongest contributions coming from large radii (up to 100 per cent at ~5 kpc in some directions), suggesting galactic-scale winds. The near-infrared observations, which have approximately 30 times higher spatial resolution, show that two sorts of shocks are present in the vicinity of the merging nuclei: low-level shocks distributed throughout our field-of-view evidenced by an H2/Brγ line ratio of ~0.6-4, and strong collimated shocks with a high H2/Brγ line ratio of ~4-8, extending south from the two nuclear discs approximately 400 pc (~0.5 arcsec). Our data suggest that the diffuse shocks are caused by the collision of the interstellar media associated with the two progenitor galaxies and the strong shocks trace the base of a collimated outflow coming from the nucleus of one of the two discs.

KW - Galaxies: interactions

KW - Galaxies: kinematics and dynamics

KW - Galaxies: nuclei

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DO - 10.1093/mnras/stv081

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Shocked gas in IRAS F17207-0014: ISM collisions and outflows

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