The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243)

Michael McDonald, Mark Swinbank, Alastair C. Edge, David J. Wilner, Sylvain Veilleux, Bradford A. Benson, Michael T. Hogan, Daniel P Marrone, Brian R. McNamara, Lisa H. Wei, Matthew B. Bayliss, Marshall W. Bautz

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Abstract

We present new optical integral field spectroscopy (Gemini South) and submillimeter spectroscopy (Submillimeter Array) of the central galaxy in the Phoenix cluster (SPT-CLJ2344-4243). This cluster was previously reported to have a massive starburst (∼800 M yr-1) in the central, brightest cluster galaxy, most likely fueled by the rapidly cooling intracluster medium. These new data reveal a complex emission-line nebula, extending for >30 kpc from the central galaxy, detected at [O II]λλ3726, 3729, [O III]λλ4959, 5007, Hβ, Hγ, Hδ, [Ne III]λ3869, and He II λ4686. The total Hα luminosity, assuming Hα/Hβ = 2.85, is L Hα = 7.6 ± 0.4 ×1043 erg s-1, making this the most luminous emission-line nebula detected in the center of a cool core cluster. Overall, the relative fluxes of the low-ionization lines (e.g., [O II], Hβ) to the UV continuum are consistent with photoionization by young stars. In both the center of the galaxy and in a newly discovered highly ionized plume to the north of the galaxy, the ionization ratios are consistent with both shocks and active galactic nucleus (AGN) photoionization. We speculate that this extended plume may be a galactic wind, driven and partially photoionized by both the starburst and central AGN. Throughout the cluster we measure elevated high-ionization line ratios (e.g., He II/Hβ, [O III]/Hβ), coupled with an overall high-velocity width (FWHM ≳ 500 km s-1), suggesting that shocks are likely important throughout the interstellar medium of the central galaxy. These shocks are most likely driven by a combination of stellar winds from massive young stars, core-collapse supernovae, and the central AGN. In addition to the warm, ionized gas, we detect a substantial amount of cold, molecular gas via the CO(3-2) transition, coincident in position with the galaxy center. We infer a molecular gas mass of = 2.2 ± 0.6 × 1010 M, which implies that the starburst will consume its fuel in ∼30 Myr if it is not replenished. The L IR/ that we measure for this cluster is consistent with the starburst limit of 500 L/M, above which radiation pressure is able to disperse the cold reservoir. The combination of the high level of turbulence in the warm phase and the high L IR/ ratio suggests that this violent starburst may be in the process of quenching itself. We propose that phases of rapid star formation may be common in the cores of galaxy clusters, but so short-lived that their signatures are quickly erased and appear only in a subsample of the most strongly cooling clusters.

Original languageEnglish (US)
Article number18
JournalAstrophysical Journal
Volume784
Issue number1
DOIs
StatePublished - Mar 20 2014

Fingerprint

Phoenix (AZ)
cold gas
ionization
galaxies
plume
spectroscopy
gases
gas
cooling
active galactic nuclei
erg
shock
molecular gases
nebulae
turbulence
plumes
photoionization
galactic winds
stars
cold

Keywords

  • galaxies: active
  • galaxies: clusters: individual (Phoenix, SPT-CLJ2344-4243)
  • galaxies: elliptical and lenticular, cD
  • galaxies: high-redshift
  • galaxies: starburst

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

McDonald, M., Swinbank, M., Edge, A. C., Wilner, D. J., Veilleux, S., Benson, B. A., ... Bautz, M. W. (2014). The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243). Astrophysical Journal, 784(1), [18]. https://doi.org/10.1088/0004-637X/784/1/18

The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243). / McDonald, Michael; Swinbank, Mark; Edge, Alastair C.; Wilner, David J.; Veilleux, Sylvain; Benson, Bradford A.; Hogan, Michael T.; Marrone, Daniel P; McNamara, Brian R.; Wei, Lisa H.; Bayliss, Matthew B.; Bautz, Marshall W.

In: Astrophysical Journal, Vol. 784, No. 1, 18, 20.03.2014.

Research output: Contribution to journalArticle

McDonald, M, Swinbank, M, Edge, AC, Wilner, DJ, Veilleux, S, Benson, BA, Hogan, MT, Marrone, DP, McNamara, BR, Wei, LH, Bayliss, MB & Bautz, MW 2014, 'The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243)', Astrophysical Journal, vol. 784, no. 1, 18. https://doi.org/10.1088/0004-637X/784/1/18
McDonald, Michael ; Swinbank, Mark ; Edge, Alastair C. ; Wilner, David J. ; Veilleux, Sylvain ; Benson, Bradford A. ; Hogan, Michael T. ; Marrone, Daniel P ; McNamara, Brian R. ; Wei, Lisa H. ; Bayliss, Matthew B. ; Bautz, Marshall W. / The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243). In: Astrophysical Journal. 2014 ; Vol. 784, No. 1.
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abstract = "We present new optical integral field spectroscopy (Gemini South) and submillimeter spectroscopy (Submillimeter Array) of the central galaxy in the Phoenix cluster (SPT-CLJ2344-4243). This cluster was previously reported to have a massive starburst (∼800 M yr-1) in the central, brightest cluster galaxy, most likely fueled by the rapidly cooling intracluster medium. These new data reveal a complex emission-line nebula, extending for >30 kpc from the central galaxy, detected at [O II]λλ3726, 3729, [O III]λλ4959, 5007, Hβ, Hγ, Hδ, [Ne III]λ3869, and He II λ4686. The total Hα luminosity, assuming Hα/Hβ = 2.85, is L Hα = 7.6 ± 0.4 ×1043 erg s-1, making this the most luminous emission-line nebula detected in the center of a cool core cluster. Overall, the relative fluxes of the low-ionization lines (e.g., [O II], Hβ) to the UV continuum are consistent with photoionization by young stars. In both the center of the galaxy and in a newly discovered highly ionized plume to the north of the galaxy, the ionization ratios are consistent with both shocks and active galactic nucleus (AGN) photoionization. We speculate that this extended plume may be a galactic wind, driven and partially photoionized by both the starburst and central AGN. Throughout the cluster we measure elevated high-ionization line ratios (e.g., He II/Hβ, [O III]/Hβ), coupled with an overall high-velocity width (FWHM ≳ 500 km s-1), suggesting that shocks are likely important throughout the interstellar medium of the central galaxy. These shocks are most likely driven by a combination of stellar winds from massive young stars, core-collapse supernovae, and the central AGN. In addition to the warm, ionized gas, we detect a substantial amount of cold, molecular gas via the CO(3-2) transition, coincident in position with the galaxy center. We infer a molecular gas mass of = 2.2 ± 0.6 × 1010 M, which implies that the starburst will consume its fuel in ∼30 Myr if it is not replenished. The L IR/ that we measure for this cluster is consistent with the starburst limit of 500 L/M, above which radiation pressure is able to disperse the cold reservoir. The combination of the high level of turbulence in the warm phase and the high L IR/ ratio suggests that this violent starburst may be in the process of quenching itself. We propose that phases of rapid star formation may be common in the cores of galaxy clusters, but so short-lived that their signatures are quickly erased and appear only in a subsample of the most strongly cooling clusters.",
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T1 - The state of the warm and cold gas in the extreme starburst at the core of the phoenix galaxy cluster (SPT-CLJ2344-4243)

AU - McDonald, Michael

AU - Swinbank, Mark

AU - Edge, Alastair C.

AU - Wilner, David J.

AU - Veilleux, Sylvain

AU - Benson, Bradford A.

AU - Hogan, Michael T.

AU - Marrone, Daniel P

AU - McNamara, Brian R.

AU - Wei, Lisa H.

AU - Bayliss, Matthew B.

AU - Bautz, Marshall W.

PY - 2014/3/20

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N2 - We present new optical integral field spectroscopy (Gemini South) and submillimeter spectroscopy (Submillimeter Array) of the central galaxy in the Phoenix cluster (SPT-CLJ2344-4243). This cluster was previously reported to have a massive starburst (∼800 M yr-1) in the central, brightest cluster galaxy, most likely fueled by the rapidly cooling intracluster medium. These new data reveal a complex emission-line nebula, extending for >30 kpc from the central galaxy, detected at [O II]λλ3726, 3729, [O III]λλ4959, 5007, Hβ, Hγ, Hδ, [Ne III]λ3869, and He II λ4686. The total Hα luminosity, assuming Hα/Hβ = 2.85, is L Hα = 7.6 ± 0.4 ×1043 erg s-1, making this the most luminous emission-line nebula detected in the center of a cool core cluster. Overall, the relative fluxes of the low-ionization lines (e.g., [O II], Hβ) to the UV continuum are consistent with photoionization by young stars. In both the center of the galaxy and in a newly discovered highly ionized plume to the north of the galaxy, the ionization ratios are consistent with both shocks and active galactic nucleus (AGN) photoionization. We speculate that this extended plume may be a galactic wind, driven and partially photoionized by both the starburst and central AGN. Throughout the cluster we measure elevated high-ionization line ratios (e.g., He II/Hβ, [O III]/Hβ), coupled with an overall high-velocity width (FWHM ≳ 500 km s-1), suggesting that shocks are likely important throughout the interstellar medium of the central galaxy. These shocks are most likely driven by a combination of stellar winds from massive young stars, core-collapse supernovae, and the central AGN. In addition to the warm, ionized gas, we detect a substantial amount of cold, molecular gas via the CO(3-2) transition, coincident in position with the galaxy center. We infer a molecular gas mass of = 2.2 ± 0.6 × 1010 M, which implies that the starburst will consume its fuel in ∼30 Myr if it is not replenished. The L IR/ that we measure for this cluster is consistent with the starburst limit of 500 L/M, above which radiation pressure is able to disperse the cold reservoir. The combination of the high level of turbulence in the warm phase and the high L IR/ ratio suggests that this violent starburst may be in the process of quenching itself. We propose that phases of rapid star formation may be common in the cores of galaxy clusters, but so short-lived that their signatures are quickly erased and appear only in a subsample of the most strongly cooling clusters.

AB - We present new optical integral field spectroscopy (Gemini South) and submillimeter spectroscopy (Submillimeter Array) of the central galaxy in the Phoenix cluster (SPT-CLJ2344-4243). This cluster was previously reported to have a massive starburst (∼800 M yr-1) in the central, brightest cluster galaxy, most likely fueled by the rapidly cooling intracluster medium. These new data reveal a complex emission-line nebula, extending for >30 kpc from the central galaxy, detected at [O II]λλ3726, 3729, [O III]λλ4959, 5007, Hβ, Hγ, Hδ, [Ne III]λ3869, and He II λ4686. The total Hα luminosity, assuming Hα/Hβ = 2.85, is L Hα = 7.6 ± 0.4 ×1043 erg s-1, making this the most luminous emission-line nebula detected in the center of a cool core cluster. Overall, the relative fluxes of the low-ionization lines (e.g., [O II], Hβ) to the UV continuum are consistent with photoionization by young stars. In both the center of the galaxy and in a newly discovered highly ionized plume to the north of the galaxy, the ionization ratios are consistent with both shocks and active galactic nucleus (AGN) photoionization. We speculate that this extended plume may be a galactic wind, driven and partially photoionized by both the starburst and central AGN. Throughout the cluster we measure elevated high-ionization line ratios (e.g., He II/Hβ, [O III]/Hβ), coupled with an overall high-velocity width (FWHM ≳ 500 km s-1), suggesting that shocks are likely important throughout the interstellar medium of the central galaxy. These shocks are most likely driven by a combination of stellar winds from massive young stars, core-collapse supernovae, and the central AGN. In addition to the warm, ionized gas, we detect a substantial amount of cold, molecular gas via the CO(3-2) transition, coincident in position with the galaxy center. We infer a molecular gas mass of = 2.2 ± 0.6 × 1010 M, which implies that the starburst will consume its fuel in ∼30 Myr if it is not replenished. The L IR/ that we measure for this cluster is consistent with the starburst limit of 500 L/M, above which radiation pressure is able to disperse the cold reservoir. The combination of the high level of turbulence in the warm phase and the high L IR/ ratio suggests that this violent starburst may be in the process of quenching itself. We propose that phases of rapid star formation may be common in the cores of galaxy clusters, but so short-lived that their signatures are quickly erased and appear only in a subsample of the most strongly cooling clusters.

KW - galaxies: active

KW - galaxies: clusters: individual (Phoenix, SPT-CLJ2344-4243)

KW - galaxies: elliptical and lenticular, cD

KW - galaxies: high-redshift

KW - galaxies: starburst

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