We report on Chandra ACIS-S observations of five type I X-ray bursters with low persistent emission: We designate candidate persistent sources for four X-ray bursters. All candidates are detected at a persistent luminosity level of 10 32−33 erg s −1 , comparable to soft X-ray transients in quiescence. From the number of bursters with low persistent emission detected so far with the Wide Field C...

We report the results of the first-epoch observation with the ACIS-I instrument on the Chandra X-Ray Observatory of Sagittarius A* (Sgr A*), the compact radio source associated with the supermassive black hole (SMBH) at the dynamical center of the Milky Way. This observation produced the first X-ray (0.5– 7 keV) spectroscopic image with arcsecond resolution of the central 170 170 (40 pc 40 pc) ...

Abstract We report the results of joint Chandra/ACIS—NuSTAR deep observations NGC 1167, host galaxy young radio jet B2 0258+35. In ACIS data, we detect X-ray emission, extended both along and orthogonal to jet. At end southeast jet, find lower-energy emission that coincides with a region CO turbulence fast outflow motions. This suggests hot interstellar medium (ISM) may be compressed by molecul...

The utility and scope of medical imaging has expanded over the last 20 years and is now a critical part of medical practice. At the same time, Health Information Technology (HIT) has emerged as an indispensable tool for medical imaging that has been deployed widely. The benefits of HIT include collaborative and differential diagnosis; weighing and accuracy of diagnosis; and facilitation of diag...

In November 2001 we undertook a coordinated observing campaign to study the connection between X-ray and optical variability in the weak-line T Tauri star V410 Tau. The observing plan included three ∼ 15 ksec observations with Chandra using the Advanced CCD Imaging Spectrometer for Spectroscopy (ACIS-S) scheduled for different phases of the known 1.87 d starspot cycle. Photometric and spectrosc...

GRB 020321 is a faint GRB that received wide follow-up attention in X-rays (BeppoSAX/NFI, Chandra/ACIS-S, XMM-Newton), radio (ATCA) and optical (ESO, HST). We identify a weak X-ray after-glow by a combined study of the Chandra and XMM-Newton observations. Its decay index of 1.2 is typical for GRB afterglows. Inside the 4 ′′ accurate error box there is a weak optical counterpart candidate with a...

Advanced techniques in separation of concerns such as AspectOriented Programming, help to develop more maintainable and more efficient applications by providing means for modularizing crosscutting concerns. However, conflicts may appear when several concerns need to be composed for the same application, especially when dealing with around advice. We call this problem the Aspect Composition Issu...

We observed the “micro-quasar” GRS 1758–258 four times with Chandra. Two HRC-I observations were made in 2000 SeptemberOctober spanning an intermediate-to-hard spectral transition (identified with RXTE ). Another HRC-I and an ACIS/HETGS observation were made in 2001 March following a hard-to-soft transition to a very low flux state. The accurate position (J2000) of the X-ray source is RA = 18 0...