AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4

Sowgat Muzahid, Glenn G. Kacprzak, Christopher W. Churchill, Jane C. Charlton, Nikole M. Nielsen, Nigel L. Mathes, Sebastian Trujillo-Gomez

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Abstract

We present a detailed analysis of a large-scale galactic outflow in the circumgalactic medium of a massive (Mh 10 M ∼12.5 M⊙), star-forming (∼6.9 M⊙yr-1), sub-L∗( ∼0.5LB∗) galaxy at z = 0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i = 63�) and the azimuthal angle (Φ = 73�) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, ulticomponent structure with ultra-strong, wide velocity spread O VI (log N = 15.16�0.04, Δv90 = 419 km s-1) and N V (log N = 14.69�0.07, Δv90 = 285 km s-1) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (∼10-4.2 cm-3), diffuse (∼10 kpc), cool (∼104 K) photoionized gas with a super-solar metallicity ([X H] ≳0.3). From the observed narrowness of the Lyβ profile, the non-detection of S IV absorption, and the presence of strong C IV absorption in the low-resolution FOS spectrum, we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of ∼10-2.5 cm-3 and a metallicity of [X H] ≳-1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ∼2x1010M⊙a mass-flow rate of ∼54 M⊙ yr-1, a kinetic luminosity of ∼9x1041 erg s-1, and a mass loading factor of ∼8 for the outflowing high-ionization gas. These are consistent with the properties of down-the-barrel outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.

Original languageEnglish (US)
Article number132
JournalAstrophysical Journal
Volume811
Issue number2
DOIs
StatePublished - Oct 1 2015

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metallicity
outflow
gas ionization
ionization
galaxies
gas
quasars
M stars
metal
mass flow rate
galactic evolution
tracing
gases
metals
erg
inclination
halos
luminosity
kinetics
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Muzahid, S., Kacprzak, G. G., Churchill, C. W., Charlton, J. C., Nielsen, N. M., Mathes, N. L., & Trujillo-Gomez, S. (2015). AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4. Astrophysical Journal, 811(2), [132]. https://doi.org/10.1088/0004-637X/811/2/132
Muzahid, Sowgat ; Kacprzak, Glenn G. ; Churchill, Christopher W. ; Charlton, Jane C. ; Nielsen, Nikole M. ; Mathes, Nigel L. ; Trujillo-Gomez, Sebastian. / AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4. In: Astrophysical Journal. 2015 ; Vol. 811, No. 2.
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abstract = "We present a detailed analysis of a large-scale galactic outflow in the circumgalactic medium of a massive (Mh 10 M ∼12.5 M⊙), star-forming (∼6.9 M⊙yr-1), sub-L∗( ∼0.5LB∗) galaxy at z = 0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i = 63{\"i}¿½) and the azimuthal angle (Φ = 73{\"i}¿½) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, ulticomponent structure with ultra-strong, wide velocity spread O VI (log N = 15.16{\"i}¿½0.04, Δv90 = 419 km s-1) and N V (log N = 14.69{\"i}¿½0.07, Δv90 = 285 km s-1) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (∼10-4.2 cm-3), diffuse (∼10 kpc), cool (∼104 K) photoionized gas with a super-solar metallicity ([X H] ≳0.3). From the observed narrowness of the Lyβ profile, the non-detection of S IV absorption, and the presence of strong C IV absorption in the low-resolution FOS spectrum, we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of ∼10-2.5 cm-3 and a metallicity of [X H] ≳-1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ∼2x1010M⊙a mass-flow rate of ∼54 M⊙ yr-1, a kinetic luminosity of ∼9x1041 erg s-1, and a mass loading factor of ∼8 for the outflowing high-ionization gas. These are consistent with the properties of down-the-barrel outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.",
author = "Sowgat Muzahid and Kacprzak, {Glenn G.} and Churchill, {Christopher W.} and Charlton, {Jane C.} and Nielsen, {Nikole M.} and Mathes, {Nigel L.} and Sebastian Trujillo-Gomez",
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Muzahid, S, Kacprzak, GG, Churchill, CW, Charlton, JC, Nielsen, NM, Mathes, NL & Trujillo-Gomez, S 2015, 'AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4', Astrophysical Journal, vol. 811, no. 2, 132. https://doi.org/10.1088/0004-637X/811/2/132

AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4. / Muzahid, Sowgat; Kacprzak, Glenn G.; Churchill, Christopher W.; Charlton, Jane C.; Nielsen, Nikole M.; Mathes, Nigel L.; Trujillo-Gomez, Sebastian.

In: Astrophysical Journal, Vol. 811, No. 2, 132, 01.10.2015.

Research output: Contribution to journalArticle

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T1 - AN EXTREME METALLICITY, LARGE-SCALE OUTFLOW from A STAR-FORMING GALAXY at z ∼ 0.4

AU - Muzahid, Sowgat

AU - Kacprzak, Glenn G.

AU - Churchill, Christopher W.

AU - Charlton, Jane C.

AU - Nielsen, Nikole M.

AU - Mathes, Nigel L.

AU - Trujillo-Gomez, Sebastian

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Y1 - 2015/10/1

N2 - We present a detailed analysis of a large-scale galactic outflow in the circumgalactic medium of a massive (Mh 10 M ∼12.5 M⊙), star-forming (∼6.9 M⊙yr-1), sub-L∗( ∼0.5LB∗) galaxy at z = 0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i = 63�) and the azimuthal angle (Φ = 73�) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, ulticomponent structure with ultra-strong, wide velocity spread O VI (log N = 15.16�0.04, Δv90 = 419 km s-1) and N V (log N = 14.69�0.07, Δv90 = 285 km s-1) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (∼10-4.2 cm-3), diffuse (∼10 kpc), cool (∼104 K) photoionized gas with a super-solar metallicity ([X H] ≳0.3). From the observed narrowness of the Lyβ profile, the non-detection of S IV absorption, and the presence of strong C IV absorption in the low-resolution FOS spectrum, we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of ∼10-2.5 cm-3 and a metallicity of [X H] ≳-1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ∼2x1010M⊙a mass-flow rate of ∼54 M⊙ yr-1, a kinetic luminosity of ∼9x1041 erg s-1, and a mass loading factor of ∼8 for the outflowing high-ionization gas. These are consistent with the properties of down-the-barrel outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.

AB - We present a detailed analysis of a large-scale galactic outflow in the circumgalactic medium of a massive (Mh 10 M ∼12.5 M⊙), star-forming (∼6.9 M⊙yr-1), sub-L∗( ∼0.5LB∗) galaxy at z = 0.39853 that exhibits a wealth of metal-line absorption in the spectra of the background quasar Q 0122-003 at an impact parameter of 163 kpc. The galaxy inclination angle (i = 63�) and the azimuthal angle (Φ = 73�) imply that the QSO sightline is passing through the projected minor-axis of the galaxy. The absorption system shows a multiphase, ulticomponent structure with ultra-strong, wide velocity spread O VI (log N = 15.16�0.04, Δv90 = 419 km s-1) and N V (log N = 14.69�0.07, Δv90 = 285 km s-1) lines that are extremely rare in the literature. The highly ionized absorption components are well explained as arising in a low density (∼10-4.2 cm-3), diffuse (∼10 kpc), cool (∼104 K) photoionized gas with a super-solar metallicity ([X H] ≳0.3). From the observed narrowness of the Lyβ profile, the non-detection of S IV absorption, and the presence of strong C IV absorption in the low-resolution FOS spectrum, we rule out equilibrium/non-equilibrium collisional ionization models. The low-ionization photoionized gas with a density of ∼10-2.5 cm-3 and a metallicity of [X H] ≳-1.4 is possibly tracing recycled halo gas. We estimate an outflow mass of ∼2x1010M⊙a mass-flow rate of ∼54 M⊙ yr-1, a kinetic luminosity of ∼9x1041 erg s-1, and a mass loading factor of ∼8 for the outflowing high-ionization gas. These are consistent with the properties of down-the-barrel outflows from infrared-luminous starbursts as studied by Rupke et al. Such powerful, large-scale, metal-rich outflows are the primary means of sufficient mechanical and chemical feedback as invoked in theoretical models of galaxy formation and evolution.

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