RADIO DETECTION PROSPECTS FOR A BULGE POPULATION OF MILLISECOND PULSARS AS SUGGESTED BY FERMI-LAT OBSERVATIONS OF THE INNER GALAXY

被引:59
作者
Calore, F. [1 ]
Di Mauro, M. [2 ,3 ]
Donato, F. [4 ,5 ]
Hessels, J. W. T. [6 ,7 ]
Weniger, C. [1 ]
机构
[1] Univ Amsterdam, GRAPPA Inst, Sci Pk 904, NL-1090 GL Amsterdam, Netherlands
[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA
[3] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[4] Univ Torino, Dept Phys, Via Giuria 1, I-10125 Turin, Italy
[5] Ist Nazl Fis Nucl, Sez Torino, Via Giuria 1, I-10125 Turin, Italy
[6] Netherlands Inst Radio Astron, ASTRON, Postbus 2, NL-7990 AA Dwingeloo, Netherlands
[7] Univ Amsterdam, Astron Inst Anton Pannekoek, Sci Pk 904, NL-1098 XH Amsterdam, Netherlands
基金
欧洲研究理事会;
关键词
astroparticle physics; gamma-rays: diffuse background; pulsars: general; radio continuum: general; radio continuum: stars; GAMMA-RAY EMISSION; X-RAY; GALACTIC-CENTER; GLOBULAR-CLUSTERS; SPECTRAL INDEX; DISCOVERY; ASSOCIATIONS; EVOLUTION; SEARCHES; CATALOG;
D O I
10.3847/0004-637X/827/2/143
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 using 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 toward 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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页数:23
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