Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole

Mark B. Peacock; Stephen E. Zepf; Arunav Kundu; Thomas J. MacCarone; Katherine L. Rhode; John J. Salzer; Christopher Z. Waters; Robin Ciardullo; Caryl Gronwall; Daniel Stern

doi:10.1088/0004-637X/759/2/126

Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole

Mark B. Peacock, Stephen E. Zepf, Arunav Kundu, Thomas J. MacCarone, Katherine L. Rhode, John J. Salzer, Christopher Z. Waters, Robin Ciardullo, Caryl Gronwall, Daniel Stern

Physics

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

12 Scopus citations

Abstract

We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spatially resolves the [O III] emission in RZ 2109. While we are unable to make a precise determination of the morphology of the emission-line nebula, the best-fitting models all require that the [O III] λ5007 emission has a half-light radius in the range 3-7pc. The extended nature of the [O III] λ5007 emission is inconsistent with published models that invoke an intermediate-mass black hole origin. It is also inconsistent with the ionization of ejecta from a nova in the cluster. The spatial scale of the nebula could be produced via the photoionization of a strong wind driven from a stellar mass black hole accreting at roughly its Eddington rate.

Original language	English
Article number	126
Journal	Astrophysical Journal
Volume	759
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/759/2/126
State	Published - Nov 10 2012

Keywords

9globular clusters: general
X-rays: binaries
X-rays: galaxies: clusters
galaxies: individual (NGC 4472)
galaxies: star clusters: general
galaxies: star clusters: individual: RZ 2109

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@article{0bc709a0de05408381ba8dae07599d83,

title = "Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole",

abstract = "We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spatially resolves the [O III] emission in RZ 2109. While we are unable to make a precise determination of the morphology of the emission-line nebula, the best-fitting models all require that the [O III] λ5007 emission has a half-light radius in the range 3-7pc. The extended nature of the [O III] λ5007 emission is inconsistent with published models that invoke an intermediate-mass black hole origin. It is also inconsistent with the ionization of ejecta from a nova in the cluster. The spatial scale of the nebula could be produced via the photoionization of a strong wind driven from a stellar mass black hole accreting at roughly its Eddington rate.",

keywords = "9globular clusters: general, X-rays: binaries, X-rays: galaxies: clusters, galaxies: individual (NGC 4472), galaxies: star clusters: general, galaxies: star clusters: individual: RZ 2109",

author = "Peacock, {Mark B.} and Zepf, {Stephen E.} and Arunav Kundu and MacCarone, {Thomas J.} and Rhode, {Katherine L.} and Salzer, {John J.} and Waters, {Christopher Z.} and Robin Ciardullo and Caryl Gronwall and Daniel Stern",

year = "2012",

month = nov,

day = "10",

doi = "10.1088/0004-637X/759/2/126",

language = "English",

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journal = "Astrophysical Journal",

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Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole. / Peacock, Mark B.; Zepf, Stephen E.; Kundu, Arunav; MacCarone, Thomas J.; Rhode, Katherine L.; Salzer, John J.; Waters, Christopher Z.; Ciardullo, Robin; Gronwall, Caryl; Stern, Daniel.

In: Astrophysical Journal, Vol. 759, No. 2, 126, 10.11.2012.

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

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T1 - Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole

AU - Peacock, Mark B.

AU - Zepf, Stephen E.

AU - Kundu, Arunav

AU - MacCarone, Thomas J.

AU - Rhode, Katherine L.

AU - Salzer, John J.

AU - Waters, Christopher Z.

AU - Ciardullo, Robin

AU - Gronwall, Caryl

AU - Stern, Daniel

PY - 2012/11/10

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N2 - We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spatially resolves the [O III] emission in RZ 2109. While we are unable to make a precise determination of the morphology of the emission-line nebula, the best-fitting models all require that the [O III] λ5007 emission has a half-light radius in the range 3-7pc. The extended nature of the [O III] λ5007 emission is inconsistent with published models that invoke an intermediate-mass black hole origin. It is also inconsistent with the ionization of ejecta from a nova in the cluster. The spatial scale of the nebula could be produced via the photoionization of a strong wind driven from a stellar mass black hole accreting at roughly its Eddington rate.

AB - We present optical Hubble Space Telescope/Space Telescope Imaging Spectrograph (HST/STIS) spectroscopy of RZ 2109, a globular cluster (GC) in the elliptical galaxy NGC4472. This GC is notable for hosting an ultraluminous X-ray source as well as associated strong and broad [O III] λλ4959, 5007 emission. We show that the HST/STIS spectroscopy spatially resolves the [O III] emission in RZ 2109. While we are unable to make a precise determination of the morphology of the emission-line nebula, the best-fitting models all require that the [O III] λ5007 emission has a half-light radius in the range 3-7pc. The extended nature of the [O III] λ5007 emission is inconsistent with published models that invoke an intermediate-mass black hole origin. It is also inconsistent with the ionization of ejecta from a nova in the cluster. The spatial scale of the nebula could be produced via the photoionization of a strong wind driven from a stellar mass black hole accreting at roughly its Eddington rate.

KW - 9globular clusters: general

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KW - galaxies: individual (NGC 4472)

KW - galaxies: star clusters: general

KW - galaxies: star clusters: individual: RZ 2109

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