2009ApJ...702..433K -
Astrophys. J., 702, 433-440 (2009/September-1)
Chandra observation of the relativistic binary J1906+0746.
KARGALTSEV O. and PAVLOV G.G.
Abstract (from CDS):
PSR J1906+0746 is a young radio pulsar (τ = 112 kyr, P = 144 ms) in a tight binary (Porb= 3.98 hr) with a compact high-mass companion (Mcomp≃ 1.36 M☉), at the distance of about 5 kpc. We observed this unique relativistic binary with the Chandra Advanced CCD Imaging Spectrometer detector for 31.6 ks. Surprisingly, not a single photon was detected within the 3'' radius from the J1906+0746 radio position. For a plausible range of hydrogen column densities, nH= (0.5-1)x1022/cm2, the nondetection corresponds to the 90% upper limit of (3-5)x1030 erg/s on the unabsorbed 0.5-8 keV luminosity for the power-law model with Γ = 1.0-2.0, and ∼1032 erg/s on the bolometric luminosity of the thermal emission from the neutrons star surface. The inferred limits are the lowest known for pulsars with spin-down properties similar to those of PSR J1906+0746. We have also tentatively detected a puzzling extended structure which looks like a tilted ring with a radius of 1'.6 centered on the pulsar. The measured 0.5-8 keV flux of the feature, ~3.1x10–14 erg/cm2/s, implies an unabsorbed luminosity of 1.2x1032 erg/s (4.5x10–4 of the pulsar's {dot}E) for nH= 0.7x1022/cm2. If the ring is not a peculiar noise artifact, the pulsar wind nebula around an unusually underluminous pulsar would be the most plausible interpretation.
Abstract Copyright:
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Journal keyword(s):
pulsars: individual: PSR J1906+0746 - stars: neutron - X-rays: ISM
Nomenclature:
Table 1, Fig. 1: [KP2009] N (Nos 1-3).
Simbad objects:
24
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