Evidence for an intermediate-mass black hole in the globular cluster NGC 6624

Abstract

PSR B1820$-$30A is located in the globular cluster NGC 6624 and is the closest known pulsar to the centre of any globular cluster. We present more than 25 years of high-precision timing observations of this millisecond pulsar and obtain four rotational frequency time derivative measurements. Modelling these higher-order derivatives as being due to orbital motion, we find solutions which indicate that the pulsar is in either a low-eccentricity ($0.33\lesssim e\lesssim 0.4$) smaller orbit with a low mass companion (such as a main sequence star, white dwarf, neutron star, or stellar mass black hole) or a high-eccentricity ($e\gtrsim 0.9$) larger orbit with a massive companion. The cluster mass properties and the observed properties of 4U 1820$-$30 and the other pulsars in the cluster argue against the low-eccentricity possibility. The high-eccentricity solution reveals that the pulsar is most likely orbiting around an intermediate-mass black hole (IMBH) of mass $>7,500$~M${}_{\odot }$ located at the cluster centre. A gravitational model for the globular cluster, which includes such a central black hole (BH), predicts an acceleration that is commensurate with that measured for the pulsar. It further predicts that the model-dependent minimum mass of the IMBH is $\sim 60,000$~M${}_{\odot }$. Accounting for the associated contribution to the observed period derivative indicates that the $\gamma$-ray efficiency of the pulsar should be between 0.08 and 0.2. Our results suggest that other globular clusters may also contain central black holes and they may be revealed by the study of new pulsars found sufficiently close to their centres. Note that we found an erratum in Section 5 and thus, the $\sim$60,000~M${}_{\odot }$ mass mentioned above has to be replaced by the correct model-dependent mass limit of $\sim$20,000~M${}_{\odot }$. See the erratum appended.

arXiv comment15 pages, 10 figures, Accepted by MNRAS on 23 February 2017. Erratum was accepted by MNRAS on 17 May 2017

References in corpus (54)

• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• TEMPO2, a new pulsar timing package. I: Overview
• Massive Black Holes as Population III Remnants
• The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
• Formation of Supermassive Black Holes
• The formation of massive black holes through collision runaway in dense young star clusters
• Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
• Dwarf Galaxies with Optical Signatures of Active Massive Black Holes
• An Intermediate-mass Black Hole of Over 500 Solar Masses in the Galaxy ESO 243-49
• Production of Intermediate-Mass Black Holes in Globular Clusters
• An ACS Survey of Globular Clusters V: Star Catalog for Each Cluster
• Photospheric radius expansion X-ray bursts as standard candles
• An Intermediate-Mass Black Hole in the Globular Cluster G1: Improved Significance from New Keck and Hubble Space Telescope Observations
• Two stellar-mass black holes in the globular cluster M22
• Gemini and Hubble Space Telescope Evidence for an Intermediate Mass Black Hole in omega Centauri
• A 400 solar mass black hole in the Ultraluminous X-ray source M82 X-1 accreting close to its Eddington limit
• New Limits on an Intermediate Mass Black Hole in Omega Centauri: II. Dynamical Models
• Measurement and correction of variations in interstellar dispersion in high-precision pulsar timing
• The Timing of Nine Globular Cluster Pulsars
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• Detection of ionized gas in the globular cluster 47 Tucanae
• Surface Brightness Profiles of Galactic Globular Clusters from Hubble Space Telescope Images
• Nuclear Accretion in Galaxies of the Local Universe: Clues from Chandra Observations
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• Limits on intermediate-mass black holes in six Galactic globular clusters with integral-field spectroscopy
• No Evidence for Intermediate-Mass Black Holes in Globular Clusters: Strong Constraints from the JVLA
• Kinematic signature of an intermediate-mass black hole in the globular cluster NGC 6388
• Constraints on the Emission Geometries and Spin Evolution of Gamma-ray Millisecond Pulsars
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• Fermi Detection of a Luminous Gamma-ray Pulsar in a Globular Cluster
• Radio detections of the neutron star X-ray binaries 4U 1820-30 and Ser X-1 in soft X-ray states
• Radio Emission as a Test of the Existence of Intermediate Mass Black Holes in Globular Clusters and Dwarf Spheroidal Galaxies
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• Stellar mass loss and the Intra-Cluster Medium in Galactic globular clusters: a deep radio survey for HI and OH
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• The ultra-luminous X-ray source in M82: an intermediate mass black hole with a giant companion
• The first low-mass black hole X-ray binary identified in quiescence outside of a globular cluster
• Timing the Eccentric Binary Millisecond Pulsar in NGC 1851
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• Ejection of globular cluster interstellar media through ionization by white dwarfs
• A re-evaluation of the central velocity-dispersion profile in NGC 6388
• Radio Continuum Observations of 47 Tucanae and Omega Centauri: Hints for Intermediate-mass Black Holes?
• The Puzzling Negative Orbit-Period Derivative of the Low-Mass X-Ray Binary 4U 1820-30 in NGC 6624
• Millisecond pulsars around intermediate-mass black holes in globular clusters
• Do Intermediate-Mass Black Holes Exist in Globular Clusters?

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