منابع مشابه
The neutron star in the supernova remnant PKS 1209 – 52
We re-analyzed X-ray data collected with the ROSAT and ASCA observatories on a candidate neutron star (NS) near the center of the supernova remnant PKS 1209–52. We fitted the observed spectra with NS atmosphere models. The hydrogen atmosphere fits yield more realistic parameters of the NS and the intervening hydrogen column than the traditional blackbody fit. In particular, for a NS of mass 1.4...
متن کامل1e 1207.4–5209: the Puzzling Pulsar at the Center of the Pks 1209–51/52 Supernova Remnant
Second Chandra observation of 1E 1207.4–5209, the central source of the supernova remnant PKS 1209–51/52, allowed us to confirm the previously detected period of 424 ms and, assuming a uniform spin-down, estimate the period derivative, Ṗ ∼ (0.7–3)× 10−14 s s−1. The corresponding characteristic age of the pulsar, P/2Ṗ ∼ 200– 900 kyr, is much larger than the estimated age of the SNR, ∼ 7 kyr. The...
متن کاملISO observations of the BL Lac object PKS 2155 – 304 ⋆
The BL Lacertae object PKS 2155–304 was observed by the Infrared Space Observatory in May and June 1996, during a multiwavelength campaign. These are the first observations in the mid– and far–infrared bands since IRAS. In the observing period, the source showed no detectable time variability at 4.0, 14.3, 60 and 90 μm. The spectrum from 2.8 to 100 μm is well fitted by a single power law with e...
متن کاملThe Soft and Medium–energy X–ray Variability of Ngc 5548: a Reanalysis of Exosat Observations
We present a detailed cross–correlation (CCF) and power spectrum re–analysis of the X–ray light curves of the bright Seyfert 1 galaxy NGC5548 obtained with EXOSAT. The 0.05–2 keV and 1–4 keV light curves are cross–correlated with the 1–9 keV and 4–9 keV light curves respectively. We discuss how spurious time lags can be introduced by systematic effects related to detector swapping as well as th...
متن کاملDmd057695 1202..1209
Previous studies have shown that several protein kinase inhibitors are time-dependent inhibitors of cytochrome P450 (CYP) 3A. We screened 14 kinase inhibitors for time-dependent inhibition of CYP2C8 and CYP3A. Amodiaquine N-deethylation and midazolam 19-hydroxylation were used as marker reactions for CYP2C8 and CYP3A activity, respectively. A screening, IC50 shift, and mechanismbased inhibition...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1987
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/225.2.199