The discovery of quiescent X-ray emission from SAX J1808.4-3658, the transient 2.5 millisecond pulsar

被引：28

作者：

Stella, L

Campana, S

Mereghetti, S

Ricci, D

Israel, GL

机构：

[1] Osserv Astron Roma, I-00040 Monte Porzio Catone, Italy

[2] Int Ctr Relativist Astrophys, Rome, Italy

[3] Osserv Astron Brera, I-23807 Merate, LC, Italy

[4] CNR, Ist Fis Cosm G Occhialini, I-20133 Milan, Italy

[5] BeppoSAX Sci Data Ctr, I-00131 Rome, Italy

来源：

ASTROPHYSICAL JOURNAL | 2000年 / 537卷 / 02期

关键词：

accretion; accretion disks; binaries : close; pulsars : individual (SAX J1808.4-3658); stars : neutron; X-rays : stars;

D O I：

10.1086/312765

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a 20 ks BeppoSAX observation of the transient 2.5 ms X-ray pulsar SAX J1808.4-3658 in its quiescent state. A source at a level of similar to 3 x 10(-3) counts s(-1) was detected with the BeppoSAX Medium Energy Concentrator Spectrometer at a position consistent with that of SAX J1808.4-3658. The inferred 0.5-10 keV luminosity was similar to(2-3) x 10(32) ergs s(-1) (for a distance of 4 kpc), a value similar to that measured from other quiescent low-mass X-ray transients hosting an old neutron star. This result is discussed in the light of the propeller and radio pulsar shock emission models for the quiescent emission of these systems.

引用

页码：L115 / L118

页数：4

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