Gamma-ray pulsars: A gold mine

Grenier, I. A.; Harding, A. K.

doi:10.1016/j.crhy.2015.08.013

Cited by 60 publications

(46 citation statements)

References 180 publications

(277 reference statements)

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“…Deep searches for radio pulsations towards unassociated Fermi gamma-ray sources have been extremely successful in discovering new MSPs (Grenier & Harding 2015;Abdo et al 2013;Ray et al 2012). This is mostly due to the fact that targeted searches allow deeper observations than time-intensive large area surveys.…”

Section: Results For Targeted Searchesmentioning

confidence: 99%

“…They can also shine in GeV gamma rays through curvature radiation as predicted by outer gap models (Zhang & Cheng 2003). We refer to the recent review by Grenier & Harding (2015) for further details and references. Strong pulsar winds, accelerating relativistic electrons interact-ing with the surrounding medium, might be responsible for non-pulsed X-ray emission through synchrotron radiation (Chevalier 2000;Cheng et al 2004) and for TeV photons through inverse Compton scattering Aharonian et al (1997).…”

Section: Introductionmentioning

confidence: 99%

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Radio Detection Prospects for a Bulge Population of Millisecond Pulsars as Suggested by Fermi-Lat Observations of the Inner Galaxy

Calore

Mauro

Donato

et al. 2016

ApJ

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The dense stellar environment of the Galactic center has been proposed to host a large population of as-yet undetected millisecond pulsars (MSPs). Recently, this hypothesis has found support in an analysis of gamma rays detected with the Large Area Telescope onboard the Fermi satellite, which revealed an excess of diffuse GeV photons in the inner 15 deg about the Galactic center. The excess can be interpreted as the collective emission of thousands of MSPs in the Galactic bulge, with a spherical distribution strongly peaked towards the Galactic center. In order to fully establish the MSP interpretation, it is essential to find corroborating evidence in multi-wavelength searches, most notably through the detection of radio pulsations from individual bulge MSPs. Based on globular cluster observations and gamma-ray emission from the inner Galaxy, we investigate the prospects for detecting MSPs in the Galactic bulge. While previous pulsar surveys failed to identify this population, we demonstrate that upcoming large-area surveys of this region should lead to the detection of dozens of bulge MSPs. Additionally, we show that deep targeted searches of unassociated Fermi sources should be able to detect the first few MSPs in the bulge. The prospects for these deep searches are enhanced by a tentative gamma-ray/radio correlation that we infer from high-latitude gamma-ray MSPs. Such detections would constitute the first clear discoveries of field MSPs in the Galactic bulge, with far-reaching implications for gamma-ray observations, the formation history of the central Milky Way and strategy optimization for future deep radio pulsar surveys.

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Section: Results For Targeted Searchesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radio Detection Prospects for a Bulge Population of Millisecond Pulsars as Suggested by Fermi-Lat Observations of the Inner Galaxy

Calore

Mauro

Donato

et al. 2016

ApJ

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“…The topic has been discussed in many reviews, e.g. by Arons (1979); Michel (2004) and recently by Arons (2009Arons ( , 2012; Spitkovsky (2011); Bühler and Blandford (2014); Beskin et al (2015); Grenier and Harding (2015); Pétri (2016). We focus on the pulsar itself, i.e.…”

Section: Introductionmentioning

confidence: 99%

Electrodynamics of Pulsar Magnetospheres

2016

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We review electrodynamics of rotating magnetized neutron stars, from the early vacuum model to recent numerical experiments with plasmafilled magnetospheres. Significant progress became possible due to the development of global particle-in-cell simulations which capture particle acceleration, emission of high-energy photons, and electron-positron pair creation. The numerical experiments show from first principles how and where electric gaps form, and promise to explain the observed pulsar activity from radio waves to gamma-rays.

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“…Such studies bear particular relevance for the strongly interacting matter of Quantum Chromodynamics (QCD). For example, astrophysical objects like neutron stars, made of dense QCD matter, can be rapidly spinning [1,2]. In relativistic heavy ion collision experiments, the typical collision events are off-central and the created QCD matter will carry a nonzero angular momentum on the order of 10 4 ∼ 10 5 with local angular velocity in the range 0.01 ∼ 0.1GeV [3][4][5][6][7][8].…”

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confidence: 99%

Pairing Phase Transitions of Matter under Rotation

2016

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The phases and properties of matter under global rotation have attracted much interest recently. In this paper we investigate the pairing phenomena in a system of fermions under the presence of rotation. We find that there is a generic suppression effect on pairing states with zero angular momentum. We demonstrate this effect with the chiral condensation and the color superconductivity in hot dense QCD matter as explicit examples. In the case of chiral condensation, a new phase diagram in the temperature-rotation parameter space is found, with a nontrivial critical point.Introduction.-The phases and properties of matter can become highly nontrivial under rotation, and have attracted a lot of interest recently. Such studies bear particular relevance for the strongly interacting matter of Quantum Chromodynamics (QCD). For example, astrophysical objects like neutron stars, made of dense QCD matter, can be rapidly spinning [1,2]. In relativistic heavy ion collision experiments, the typical collision events are off-central and the created QCD matter will carry a nonzero angular momentum on the order of 10 4 ∼ 10 5 with local angular velocity in the range 0.01 ∼ 0.1GeV [3][4][5][6][7][8]. There has also been impressive progress to study the rotating QCD matter using lattice gauge theory simulations [9].In rotating matter, many interesting transport phenomena could occur. For example, fluid rotation can induce anomalous transport processes in a system of chiral fermions, such as the chiral vortical effect [10][11][12] and chiral vortical wave [13]. These can lead to measurable experimental signals (see e.g. reviews in [14,15]). In such anomalous transport, it is found that the fluid rotation plays a very analogous role to a magnetic field. Indeed there appears to be interesting similarity between the chiral vortical effect and the chiral magnetic effect [10,16], as well as between the chiral vortical wave and the chiral magnetic wave [17,18].Apart from transport properties, it is of significant interest to explore the effects of rotation on the phase transitions of matter in both relativistic and non-relativistic cases. It is well known that a magnetic field can bring interesting effects on the thermodynamics and phase diagram of e.g. QCD matter [19][20][21][22][23][24], such as the magnetic catalysis and inverse catalysis (see reviews in [25,26]) on the chiral condensation. Given the close analogy between rotation and magnetic field, it is tempting to ask how the rotation could influence phase transitions. In this paper, we investigate the pairing phenomena in a system of fermions under rotation. We find a generic suppression effect on pairing states with zero angular momentum,

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Gamma-ray pulsars: A gold mine

Cited by 60 publications

References 180 publications

Radio Detection Prospects for a Bulge Population of Millisecond Pulsars as Suggested by Fermi-Lat Observations of the Inner Galaxy

Radio Detection Prospects for a Bulge Population of Millisecond Pulsars as Suggested by Fermi-Lat Observations of the Inner Galaxy

Electrodynamics of Pulsar Magnetospheres

Pairing Phase Transitions of Matter under Rotation

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