Low-mass X-ray binaries and globular clusters in Centaurus A

Andrés Jordán; Gregory R. Sivakoff; Dean E. McLaughlin; John P. Blakeslee; Daniel A. Evans; Ralph P. Kraft; Martin J. Hardcastle; Eric W. Peng; Patrick Côté; Judith H. Croston; Adrienne M. Juett; Dante Minniti; Somak Raychaudhury; Craig L. Sarazin; Diana M. Worrall; William E. Harris; Kristin A. Woodley; Mark Birkinshaw; Nicola J. Brassington; William R. Forman; Christine Jones; Stephen S. Murray

doi:10.1086/525524

Low-mass X-ray binaries and globular clusters in Centaurus A

Andrés Jordán, Gregory R. Sivakoff, Dean E. McLaughlin, John P. Blakeslee, Daniel A. Evans, Ralph P. Kraft, Martin J. Hardcastle, Eric W. Peng, Patrick Côté, Judith H. Croston, Adrienne M. Juett, Dante Minniti, Somak Raychaudhury, Craig L. Sarazin, Diana M. Worrall, William E. Harris, Kristin A. Woodley, Mark Birkinshaw, Nicola J. Brassington, William R. FormanChristine Jones, Stephen S. Murray

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Abstract

We present results of Hubble Space Telescope and Chandra X-Ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centauras A. Out of 440 GC candidates, we find 41 host X-ray point sources that are most likely LMXBs. We fit King models to our GC candidates in order to measure their structural parameters. We find that GCs that host LMXBs are denser and more compact and have higher encounter rates and concentrations than the GC population as a whole. We show that the higher concentrations and masses are a consequence of the dependence of LMXB incidence on central density and size plus the general trend for denser GCs to have higher masses and concentrations. We conclude that neither concentration nor mass is a fundamental variable in determining the presence of LMXBs in GCs and that the more fundamental parameters relate to central density and size.

Original language	English
Pages (from-to)	L117-L120
Journal	Astrophysical Journal
Volume	671
Issue number	2 PART 2
DOIs	https://doi.org/10.1086/525524
State	Published - 2007
Externally published	Yes

Keywords

Galaxies: elliptical and lenticular, cD
Globular clusters: general
X-rays: binaries

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10.1086/525524

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Jordán, A., Sivakoff, G. R., McLaughlin, D. E., Blakeslee, J. P., Evans, D. A., Kraft, R. P., Hardcastle, M. J., Peng, E. W., Côté, P., Croston, J. H., Juett, A. M., Minniti, D., Raychaudhury, S., Sarazin, C. L., Worrall, D. M., Harris, W. E., Woodley, K. A., Birkinshaw, M., Brassington, N. J., ... Murray, S. S. (2007). Low-mass X-ray binaries and globular clusters in Centaurus A. Astrophysical Journal, 671(2 PART 2), L117-L120. https://doi.org/10.1086/525524

@article{14449923d8094e7ba3acb0a7e6476b18,

title = "Low-mass X-ray binaries and globular clusters in Centaurus A",

abstract = "We present results of Hubble Space Telescope and Chandra X-Ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centauras A. Out of 440 GC candidates, we find 41 host X-ray point sources that are most likely LMXBs. We fit King models to our GC candidates in order to measure their structural parameters. We find that GCs that host LMXBs are denser and more compact and have higher encounter rates and concentrations than the GC population as a whole. We show that the higher concentrations and masses are a consequence of the dependence of LMXB incidence on central density and size plus the general trend for denser GCs to have higher masses and concentrations. We conclude that neither concentration nor mass is a fundamental variable in determining the presence of LMXBs in GCs and that the more fundamental parameters relate to central density and size.",

keywords = "Galaxies: elliptical and lenticular, cD, Globular clusters: general, X-rays: binaries",

author = "Andr{\'e}s Jord{\'a}n and Sivakoff, {Gregory R.} and McLaughlin, {Dean E.} and Blakeslee, {John P.} and Evans, {Daniel A.} and Kraft, {Ralph P.} and Hardcastle, {Martin J.} and Peng, {Eric W.} and Patrick C{\^o}t{\'e} and Croston, {Judith H.} and Juett, {Adrienne M.} and Dante Minniti and Somak Raychaudhury and Sarazin, {Craig L.} and Worrall, {Diana M.} and Harris, {William E.} and Woodley, {Kristin A.} and Mark Birkinshaw and Brassington, {Nicola J.} and Forman, {William R.} and Christine Jones and Murray, {Stephen S.}",

year = "2007",

doi = "10.1086/525524",

language = "English",

volume = "671",

pages = "L117--L120",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

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Jordán, A, Sivakoff, GR, McLaughlin, DE, Blakeslee, JP, Evans, DA, Kraft, RP, Hardcastle, MJ, Peng, EW, Côté, P, Croston, JH, Juett, AM, Minniti, D, Raychaudhury, S, Sarazin, CL, Worrall, DM, Harris, WE, Woodley, KA, Birkinshaw, M, Brassington, NJ, Forman, WR, Jones, C & Murray, SS 2007, 'Low-mass X-ray binaries and globular clusters in Centaurus A', Astrophysical Journal, vol. 671, no. 2 PART 2, pp. L117-L120. https://doi.org/10.1086/525524

TY - JOUR

T1 - Low-mass X-ray binaries and globular clusters in Centaurus A

AU - Jordán, Andrés

AU - Sivakoff, Gregory R.

AU - McLaughlin, Dean E.

AU - Blakeslee, John P.

AU - Evans, Daniel A.

AU - Kraft, Ralph P.

AU - Hardcastle, Martin J.

AU - Peng, Eric W.

AU - Côté, Patrick

AU - Croston, Judith H.

AU - Juett, Adrienne M.

AU - Minniti, Dante

AU - Raychaudhury, Somak

AU - Sarazin, Craig L.

AU - Worrall, Diana M.

AU - Harris, William E.

AU - Woodley, Kristin A.

AU - Birkinshaw, Mark

AU - Brassington, Nicola J.

AU - Forman, William R.

AU - Jones, Christine

AU - Murray, Stephen S.

PY - 2007

Y1 - 2007

N2 - We present results of Hubble Space Telescope and Chandra X-Ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centauras A. Out of 440 GC candidates, we find 41 host X-ray point sources that are most likely LMXBs. We fit King models to our GC candidates in order to measure their structural parameters. We find that GCs that host LMXBs are denser and more compact and have higher encounter rates and concentrations than the GC population as a whole. We show that the higher concentrations and masses are a consequence of the dependence of LMXB incidence on central density and size plus the general trend for denser GCs to have higher masses and concentrations. We conclude that neither concentration nor mass is a fundamental variable in determining the presence of LMXBs in GCs and that the more fundamental parameters relate to central density and size.

AB - We present results of Hubble Space Telescope and Chandra X-Ray Observatory observations of globular clusters (GCs) and low-mass X-ray binaries (LMXBs) in the central regions of Centauras A. Out of 440 GC candidates, we find 41 host X-ray point sources that are most likely LMXBs. We fit King models to our GC candidates in order to measure their structural parameters. We find that GCs that host LMXBs are denser and more compact and have higher encounter rates and concentrations than the GC population as a whole. We show that the higher concentrations and masses are a consequence of the dependence of LMXB incidence on central density and size plus the general trend for denser GCs to have higher masses and concentrations. We conclude that neither concentration nor mass is a fundamental variable in determining the presence of LMXBs in GCs and that the more fundamental parameters relate to central density and size.

KW - Galaxies: elliptical and lenticular, cD

KW - Globular clusters: general

KW - X-rays: binaries

UR - http://www.scopus.com/inward/record.url?scp=48749085281&partnerID=8YFLogxK

U2 - 10.1086/525524

DO - 10.1086/525524

M3 - Article

AN - SCOPUS:48749085281

SN - 0004-637X

VL - 671

SP - L117-L120

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 PART 2

ER -

Low-mass X-ray binaries and globular clusters in Centaurus A

Abstract

Keywords

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