HST/WFC3 OBSERVATIONS of AN OFF-NUCLEAR SUPERBUBBLE in ARP 220

Kelly E. Lockhart; Lisa J. Kewley; Jessica R. Lu; Mark G. Allen; David Rupke; Daniela Calzetti; Richard I. Davies; Michael A. Dopita; Hauke Engel; Timothy M. Heckman; Claus Leitherer; David B. Sanders

doi:10.1088/0004-637X/810/2/149

HST/WFC3 OBSERVATIONS of AN OFF-NUCLEAR SUPERBUBBLE in ARP 220

Kelly E. Lockhart, Lisa J. Kewley, Jessica R. Lu, Mark G. Allen, David Rupke, Daniela Calzetti, Richard I. Davies, Michael A. Dopita, Hauke Engel, Timothy M. Heckman, Claus Leitherer, David B. Sanders

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9 Citations (Scopus)

Abstract

We present a high spatial resolution optical and infrared study of the circumnuclear region in Arp 220, a late-stage galaxy merger. Narrowband imaging using Hubble Space Telescope/WFC3 has resolved the previously observed peak in Hα+[N ii] emission into a bubble-shaped feature. This feature measures 1.″6 in diameter, or 600 pc, and is only 1″ northwest of the western nucleus. The bubble is aligned with the western nucleus and the large-scale outflow axis seen in X-rays. We explore several possibilities for the bubble origin, including a jet or outflow from a hidden active galactic nucleus (AGN), outflows from high levels of star formation within the few hundred pc nuclear gas disk, or an ultraluminous X-ray source. An obscured AGN or high levels of star formation within the inner ∼100 pc of the nuclei are favored based on the alignment of the bubble and energetics arguments.

Original language	English
Article number	149
Journal	Astrophysical Journal
Volume	810
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/810/2/149
Publication status	Published - 10 Sept 2015

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@article{96c4fd2915714686bad0c5c29297feb7,

title = "HST/WFC3 OBSERVATIONS of AN OFF-NUCLEAR SUPERBUBBLE in ARP 220",

abstract = "We present a high spatial resolution optical and infrared study of the circumnuclear region in Arp 220, a late-stage galaxy merger. Narrowband imaging using Hubble Space Telescope/WFC3 has resolved the previously observed peak in Hα+[N ii] emission into a bubble-shaped feature. This feature measures 1.″6 in diameter, or 600 pc, and is only 1″ northwest of the western nucleus. The bubble is aligned with the western nucleus and the large-scale outflow axis seen in X-rays. We explore several possibilities for the bubble origin, including a jet or outflow from a hidden active galactic nucleus (AGN), outflows from high levels of star formation within the few hundred pc nuclear gas disk, or an ultraluminous X-ray source. An obscured AGN or high levels of star formation within the inner ∼100 pc of the nuclei are favored based on the alignment of the bubble and energetics arguments.",

keywords = "evolution, galaxies: ISM, galaxies: individual (Arp 220)",

author = "Lockhart, {Kelly E.} and Kewley, {Lisa J.} and Lu, {Jessica R.} and Allen, {Mark G.} and David Rupke and Daniela Calzetti and Davies, {Richard I.} and Dopita, {Michael A.} and Hauke Engel and Heckman, {Timothy M.} and Claus Leitherer and Sanders, {David B.}",

year = "2015",

month = sep,

day = "10",

doi = "10.1088/0004-637X/810/2/149",

language = "English",

volume = "810",

journal = "Astrophysical Journal",

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T1 - HST/WFC3 OBSERVATIONS of AN OFF-NUCLEAR SUPERBUBBLE in ARP 220

AU - Lockhart, Kelly E.

AU - Kewley, Lisa J.

AU - Lu, Jessica R.

AU - Allen, Mark G.

AU - Rupke, David

AU - Calzetti, Daniela

AU - Davies, Richard I.

AU - Dopita, Michael A.

AU - Engel, Hauke

AU - Heckman, Timothy M.

AU - Leitherer, Claus

AU - Sanders, David B.

PY - 2015/9/10

Y1 - 2015/9/10

N2 - We present a high spatial resolution optical and infrared study of the circumnuclear region in Arp 220, a late-stage galaxy merger. Narrowband imaging using Hubble Space Telescope/WFC3 has resolved the previously observed peak in Hα+[N ii] emission into a bubble-shaped feature. This feature measures 1.″6 in diameter, or 600 pc, and is only 1″ northwest of the western nucleus. The bubble is aligned with the western nucleus and the large-scale outflow axis seen in X-rays. We explore several possibilities for the bubble origin, including a jet or outflow from a hidden active galactic nucleus (AGN), outflows from high levels of star formation within the few hundred pc nuclear gas disk, or an ultraluminous X-ray source. An obscured AGN or high levels of star formation within the inner ∼100 pc of the nuclei are favored based on the alignment of the bubble and energetics arguments.

AB - We present a high spatial resolution optical and infrared study of the circumnuclear region in Arp 220, a late-stage galaxy merger. Narrowband imaging using Hubble Space Telescope/WFC3 has resolved the previously observed peak in Hα+[N ii] emission into a bubble-shaped feature. This feature measures 1.″6 in diameter, or 600 pc, and is only 1″ northwest of the western nucleus. The bubble is aligned with the western nucleus and the large-scale outflow axis seen in X-rays. We explore several possibilities for the bubble origin, including a jet or outflow from a hidden active galactic nucleus (AGN), outflows from high levels of star formation within the few hundred pc nuclear gas disk, or an ultraluminous X-ray source. An obscured AGN or high levels of star formation within the inner ∼100 pc of the nuclei are favored based on the alignment of the bubble and energetics arguments.

KW - evolution

KW - galaxies: ISM

KW - galaxies: individual (Arp 220)

UR - http://www.scopus.com/inward/record.url?scp=84941640944&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/810/2/149

DO - 10.1088/0004-637X/810/2/149

M3 - Article

SN - 0004-637X

VL - 810

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 149

ER -

HST/WFC3 OBSERVATIONS of AN OFF-NUCLEAR SUPERBUBBLE in ARP 220

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