2000ApJ...537L.115S

Query : 2000ApJ...537L.115S

2000ApJ...537L.115S - Astrophys. J., 537, L115-L118 (2000/July-2)

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

STELLA L., CAMPANA S., MEREGHETTI S., RICCI D. and ISRAEL G.L.

Abstract (from CDS):

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 ∼3x10–3 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 ~(2-3)x1032 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.

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Journal keyword(s): Accretion, Accretion Disks - Stars: Binaries: Close - Stars: Pulsars: Individual: Alphanumeric: SAX J1808.4-3658 - Stars: Neutron - X-Rays: Stars

Nomenclature: Fig.1: [SCM2000] Source A N=1.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* V822 Cen LXB 14 58 21.9347842080 -31 40 07.515432768 11.95 12.85 12.8     K3-K7V 555 0
2 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0
3 [SCM2000] Source A X 18 08 32.9 -36 58 08           ~ 2 0
4 X Aql X-1 LXB 19 11 16.0571313336 +00 35 05.868232692           ~ 1186 1

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