a st ro - p h / 02 07 60 2 v 1 2 7 Ju l 2 00 2 The Compact Central Object in the Supernova Remnant G 266 . 2 – 1 . 2
نویسنده
چکیده
We observed the compact central object CXOU J085201.4–461753 in the supernova remnant G266.2–1.2 (RX J0852.0–4622) with the Chandra ACIS detector in timing mode. The spectrum of this object can be described by a blackbody model with the temperature kT = 404± 5 eV and radius of the emitting region R = 0.28±0.01 km, at a distance of 1 kpc. Power-law and thermal plasma models do not fit the source spectrum. The spectrum shows a marginally significant feature at 1.68 keV. Search for periodicity yields two candidate periods, about 301 ms and 33 ms, both significant at a 2.1σ level; the corresponding pulsed fractions are 13% and 9%, respectively. We find no evidence for long-term variability of the source flux, nor do we find extended emission around the central object. We suggest that CXOU J085201.4–461753 is similar to CXOU J232327.9+584842, the central source of the supernova remnant Cas A. It could be either a neutron star with a low or regular magnetic field, slowly accreting from a fossil disk, or, more likely, an isolated neutron star with a superstrong magnetic field. In either case, a conservative upper limit on surface temperature of a 10 km radius neutron star is about 90 eV, which suggests accelerated cooling for a reasonable age of a few thousand years. Subject headings: stars: neutron — supernova remnants: individual (G266.2–1.2) — X-rays: individual (CXOU J085201.4–461753)
منابع مشابه
ar X iv : a st ro - p h / 02 07 41 9 v 1 1 9 Ju l 2 00 2 Rarefaction Shocks , Shock Errors and Low Order of Accuracy in ZEUS
متن کامل
a st ro - p h / 00 04 19 1 v 2 2 2 M ay 2 00 0 On the Emergence and Discovery of Hot Spots in Supernova Remnant 1987 A 1
We present the discovery of several new regions of interaction between the ejecta and equatorial circumstellar ring of SN1987A, an interaction leading to a much expanded development of the supernova remnant. We also trace the development of the first such “hot spot,” discovered in 1997, back to 1995. Later hot spots seem to have emerged by early 1999. We discuss mechanisms for the long delay be...
متن کاملiv : a st ro - p h / 02 05 40 8 v 1 2 3 M ay 2 00 2 High - energy Neutrinos from the Cosmic Accelerator RX J 1713
The observation of TeV-gamma rays of π 0 origin from the supernova remnant RX J1713.7-3946 has revealed the first specific site where protons are accelerated to energies typical of the main component of the cosmic rays. In this letter we calculate the high-energy neutrino flux associated with this source to be at least 40 muon-type neutrinos per kilometer-squared per year. We perform the same c...
متن کاملar X iv : a st ro - p h / 01 10 43 3 v 1 1 8 O ct 2 00 1 Detection of X - ray Emission from SNR G 16 . 7 + 0 . 1
We have observed the Galactic supernova remnant G16.7+0.1 for 13 ks using the EPIC cameras aboard the XMM-Newton X-ray Observatory, producing the first detection of the SNR outside of the radio band. G16.7+0.1 is one of the faintest radio synchrotron nebulae yet detected, although the core-to-shell flux ratio at 6 cm is typical of composite SNRs. The distance to the object is unknown. Our image...
متن کاملar X iv : a st ro - p h / 02 11 45 7 v 2 1 0 D ec 2 00 2 Time variation of fundamental constants : two phenomenological models
Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.
متن کامل