Dynamical Formation of Millisecond Pulsars in Globular Clusters

Hui, C. Y.; Cheng, K. S.; Taam, Ronald E.

doi:10.1088/0004-637x/714/2/1149

Cited by 76 publications

(98 citation statements)

References 34 publications

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“…Since these two quantities favor the formation of MSPs (e.g. Ivanova 2006Ivanova ,2008Hui et al 2010), it is expected that Terzan 5 can house more MSPs than 47 Tuc. If we assume that the mean spin-down power (L sd ) of MSPs and the conversion efficiency of gamma-ray power are the same for Terzan 5 and 47 Tuc, the ratio of number of MSPs between these two clusters is simply given by N T er /N T uc ∼ (L γT er /L γT uc ) ∼ 25 (assuming the distance to 47 Tuc and Terzan 5 is 4 kpc and 10 kpc, respectively).…”

Section: Discussionmentioning

confidence: 99%

FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM THE GLOBULAR CLUSTER TERZAN 5

Kong¹,

Hui²,

Cheng³

2010

ApJ

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We report the discovery of gamma-ray emission from the Galactic globular cluster Terzan 5 using data taken with the Fermi Gamma-ray Space Telescope, from 2008 August 8 to 2010 January 1. Terzan 5 is clearly detected in the 0.5-20 GeV band by Fermi at ∼ 27σ level. This makes Terzan 5 as the second gamma-ray emitting globular cluster seen by Fermi after 47 Tuc. The energy spectrum of Terzan 5 is best represented by an exponential cutoff power-law model, with a photon index of ∼ 1.9 and a cutoff energy at ∼ 3.8 GeV. By comparing to 47 Tuc, we suggest that the observed gamma-ray emission is associated with millisecond pulsars, and is either from the magnetospheres or inverse Compton scattering between the relativistic electrons/positrons in the pulsar winds and the background soft photons from the Galactic plane. Furthermore, it is suggestive that the distance to Terzan 5 is less than 10 kpc and > 10 GeV photons can be seen in the future.

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Section: Discussionmentioning

confidence: 99%

FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM THE GLOBULAR CLUSTER TERZAN 5

Kong¹,

Hui²,

Cheng³

2010

ApJ

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“…One simple method of population synthesis study is the so called 'snapshot' method where people study the observed properties of one or more 'classes' or 'sub-classes' (Hui, Cheng, & Taam 2010;Konar 2010;Papitto et al 2014). This method is not always sufficient to reveal the true characteristics of a 'class' of neutron stars, mainly because of our limitations in observing neutron stars.…”

Section: Radio Pulsars : Synthesis Studiesmentioning

confidence: 99%

Neutron Star Physics in the Square Kilometre Array Era: An Indian Perspective

Konar¹,

Bagchi²,

Bandyopadhyay³

et al. 2016

J Astrophys Astron

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It is an exceptionally opportune time for Astrophysics when a number of next-generation mega-instruments are poised to observe the universe across the entire electromagnetic spectrum with unprecedented data quality. The Square Kilometre Array (SKA) is undoubtedly one of the major components of this scenario. In particular, the SKA is expected to discover tens of thousands of new neutron stars giving a major fillip to a wide range of scientific investigations. India has a sizeable community of scientists working on different aspects of neutron star physics with immediate access to both the uGMRT (an SKA pathfinder) and the recently launched X-ray observatory Astrosat. The current interests of the community largely centre around studies of -a) the generation of neutron stars and the SNe connection, b) the neutron star population and evolutionary pathways, c) the evolution of neutron stars in binaries and the magnetic fields, d) the neutron star equation of state, e) the radio pulsar emission mechanism, and, f) the radio pulsars as probes of gravitational physics. Most of these studies are the main goals of the SKA first phase, which is likely to be operational in the next four years. This article summarises the science goals of the Indian neutron star community in the SKA era, with significant focus on coordinated efforts among the SKA and other existing/upcoming instruments.

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“…Millisecond radio pulsars (L x ∼ (1-4) × 10 30 erg s −1 ) are believed to be the final stage of NS-LMXB evolution whereby the NS stops accreting appreciable amounts of material and turns on as a radio pulsar. Studies of millisecond radio pulsars in GCs have confirmed the dynamical and metallicity effects on their formation in both the radio (Hui et al 2010) and gamma-ray (Abdo et al 2010;Hui et al 2011) regimes. With 22 discovered millisecond radio pulsars in GC 47 Tuc (Lorimer et al 2003) and possibly twice as many undetected (Heinke et al 2005), GCs are a hot spot for the study of LMXB evolution.…”

Section: Introductionmentioning

confidence: 96%

Stacking Star Clusters in M51: Searching for Faint X-Ray Binaries

Vulic

Barmby

Gallagher

2013

ApJ

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The population of low-luminosity (<10 35 erg s −1 ) X-ray binaries (XRBs) has been investigated in our Galaxy and M31 but not further. To address this problem, we have used data from the Chandra X-Ray Observatory and the Hubble Space Telescope to investigate the faint population of XRBs in the grand-design spiral galaxy M51. A matching analysis found 25 star clusters coincident with 20 X-ray point sources within 1. 5 (60 pc). From X-ray and optical color-color plots we determine that this population is dominated by high-mass XRBs. A stacking analysis of the X-ray data at the positions of optically identified star clusters was completed to probe low-luminosity X-ray sources. No cluster type had a significant detection in any X-ray energy band. An average globular cluster had the largest upper limit, 9.23 × 10 34 erg s −1 , in the full band (0.3-8 keV) while on average the complete sample of clusters had the lowest upper limit, 6.46 × 10 33 erg s −1 in the hard band (2-8 keV). We determined average luminosities of the young and old star cluster populations and compared the results to those from the Milky Way. We conclude that deeper X-ray data are required to identify faint sources with a stacking analysis.

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Dynamical Formation of Millisecond Pulsars in Globular Clusters

Cited by 76 publications

References 34 publications

FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM THE GLOBULAR CLUSTER TERZAN 5

FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM THE GLOBULAR CLUSTER TERZAN 5

Neutron Star Physics in the Square Kilometre Array Era: An Indian Perspective

Stacking Star Clusters in M51: Searching for Faint X-Ray Binaries

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