2MASS J18084346-2023591 , the SIMBAD biblio

2002ApJ...564..935K - Astrophys. J., 564, 935-940 (2002/January-2)

Precise Chandra localization of the soft gamma-ray repeater SGR 1806-20.

KAPLAN D.L., FOX D.W., KULKARNI S.R., GOTTHELF E.V., VASISHT G. and FRAIL D.A.

Abstract (from CDS):

We present observations of the soft γ-ray repeater SGR 1806-20 taken with the Chandra X-Ray Observatory. We identify the X-ray counterpart of SGR 1806-20 based on detection of 7.5 s pulsations. Using three unrelated X-ray sources (and USNO stars) as position references, we are able to determine that the SGR is at α2000=18h08m39{fs}32 and δ2000=-20°24'39".5, with rms uncertainty of 0".3 in each coordinate. We find that SGR 1806-20 is located within the 1 σ error region determined by Interplanetary Network data and is 14"±0".5 distant from the nonthermal core of SNR G10.0-0.3, excluding SGR 1806-20 as the origin of the core. We see evidence of a significant deviation of the spin-down of SGR 1806-20 from its long-term trend, demonstrating erratic spin-down behavior in this source similar to that seen in other SGRs. Finally, we show that there is a broad X-ray halo surrounding SGR 1806-20 out to radii ∼1' due to scattering in the interstellar medium.

Abstract Copyright:

Journal keyword(s): Astrometry - Stars: Pulsars: Individual: Alphanumeric: SGR 1806-20 - Stars: Neutron - X-Rays: Stars

Nomenclature: Table 2: [KFK2002] A (Nos A-C).

Simbad objects: 10

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