The gamma-ray millisecond pulsar deathline, revisited New velocity and distance measurements

被引：38

作者：

Guillemot, L. ^{[1
,2
]}

Smith, D. A. ^{[3
]}

Laffon, H. ^{[3
]}

Janssen, G. H. ^{[4
]}

Cognard, I. ^{[1
,2
]}

Theureau, G. ^{[1
,2
]}

Desvignes, G. ^{[5
]}

Ferrara, E. C. ^{[6
]}

Ray, P. S. ^{[7
]}

机构：

[1] Univ Orleans, Lab Phys & Chim Environm & Espace, CNRS, F-45071 Orleans 02, France

[2] CNRS INSU, Observ Paris, Stn Radioastron Nancay, F-18330 Nancay, France

[3] Univ Bordeaux 1, IN2P3 CNRS, Ctr Etud Nucl Bordeaux Gradignan, BP 120, F-33175 Gradignan, France

[4] Netherlands Inst Radio Astron, ASTRON, Postbus 2 AA, NL-7990 Dwingeloo, Netherlands

[5] Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany

[6] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[7] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 587卷

关键词：

gamma rays: stars; pulsars: general; parallaxes; LARGE-AREA TELESCOPE; EMISSION; PULSATIONS; EVOLUTION; DISCOVERY;

D O I：

10.1051/0004-6361/201527847

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Millisecond pulsars (MSPs) represent nearly half of the more than 160 currently known gamma-ray pulsars detected by the Large Area Telescope on the Fermi satellite, and a third of all known MSPs are seen in gamma rays. The least energetic gamma-ray MSPs enable us to probe the so-called deathline for high-energy emission, i.e., the spin-down luminosity limit under which pulsars (PSRs) cease to produce detectable high-energy radiation. Characterizing the MSP luminosity distribution helps to determine their contribution to the Galactic diffuse gamma-ray emission. Aims. Because of the Shklovskii effect, precise proper motion and distance measurements are key ingredients for determining the spin-down luminosities of MSPs accurately. Our aim is to obtain new measurements of these parameters for gamma-ray MSPs when possible, and clarify the relationship between the gamma-ray luminosity of pulsars and their spin-down luminosity. Detecting low spin-down luminosity pulsars in gamma rays and characterizing their spin properties is also particularly interesting for constraining the deathline for high-energy emission. Methods. We made use of the high-quality pulsar timing data recorded at the Nancay Radio Telescope over several years to characterize the properties of a selection of MSPs. For one of the pulsars, the dataset was complemented with Westerbork Synthesis Radio Telescope observations. The rotation ephemerides derived from this analysis were also used to search the LAT data for new gamma-ray MSPs. Results. For the MSPs considered in this study, we obtained new transverse proper motion measurements or updated the existing ones, and placed new distance constraints for some of them, with four new timing parallax measurements. We discovered significant GeV gamma-ray signals from four MSPs, i.e., PSRs J0740+6620, J0931-1902, J1455-3330, and J1730-2304. The latter is now the least energetic gamma-ray pulsar found to date. Despite the improved (E) over dot and L gamma estimates, the relationship between these two quantities remains unclear, especially at low (E) over dot values.

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