Chandra X-Ray Spectroscopic Imaging of Sagittarius A* and the Central Parsec of the Galaxy
- F. Baganoff, Y. Maeda, L. Townsley
- Physics
- 8 February 2001
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…
X-Ray-emitting Young Stars in the Orion Nebula
- E. Feigelson, P. Broos, Y. Tsuboi
- Physics
- 19 March 2002
The Orion Nebula Cluster and the molecular cloud in its vicinity have been observed with the ACIS-I detector on board the Chandra X-ray Observatory with 23 hr exposure in two observations. We detect…
Magnetic Flaring in the Pre-Main-Sequence Sun and Implications for the Early Solar System
- E. Feigelson, G. Garmire, S. Pravdo
- Physics
- 1 February 2002
To address the role of energetic processes in the solar nebula, we provide a detailed characterization of magnetic flaring in stellar analogs of the pre-main-sequence Sun based on two 0.5 day…
A Chandra Study of Sagittarius A East: A Supernova Remnant Regulating the Activity of Our Galactic Center?
- Y. Maeda, F. Baganoff, L. Townsley
- Physics
- 10 February 2001
We report on the X-ray emission from the shell-like, nonthermal radio source Sgr A East (SNR 000.0+00.0), located in the inner few parsecs of the Galaxy based on observations made with the ACIS…
A reduced estimate of the number of kilometre-sized near-Earth asteroids
- D. Rabinowitz, E. Helin, K. Lawrence, S. Pravdo
- Geology, PhysicsNature
- 13 January 2000
An analysis of the survey for near-Earth asteroids that uses improved detection technologies finds that the total number of asteroids with diameters > 1 km is about half the earlier estimates.
Early optical emission from the γ-ray burst of 4 October 2002
- D. Fox, S. Yost, H. Buttery
- PhysicsNature
- 20 March 2003
Observations of the long-lived emission—or ‘afterglow’—of long-duration γ-ray bursts place them at cosmological distances, but the origin of these energetic explosions remains a mystery. Observations…
Chandra X-Ray Observatory Study of the Orion Nebula Cluster and BN/KL Region
- G. Garmire, E. Feigelson, Y. Tsuboi
- Physics
- 6 June 2000
About 1000 X-ray emitting young pre–main-sequence (PMS) stars distributed in mass from ∼0.05 M☉ brown dwarfs to a ∼50 M☉ O star are detected in an image of the Orion Nebula obtained with the Advanced…
Masses of Astrometrically Discovered and Imaged Binaries: G78-28AB and GJ 231.1BC
- S. Pravdo, S. Shaklan, M. Ireland
- Physics, Geology
- 11 May 2006
The Stellar Planet Survey (STEPS) is an ongoing astrometric search for giant planets and brown dwarfs around a sample of ~30 M dwarfs. We have discovered several low-mass companions by measuring the…
A1540-53, an eclipsing X-ray binary pulsator
- R. Becker, J. Swank, P. Serlemitsos
- Physics
- 1 May 1977
An eclipsing X-ray binary pulsator consistent with the location of A1540-53 was observed. The source pulse period was 528.93 plus or minus 0.10 seconds. The binary nature is confirmed by a Doppler…
An Orbital Light-Curve Model for GX 301–2
We present the results of X-ray observations of GX 301-2 with instruments aboard the ASCA and RXTE spacecraft, as well as analysis of archival data from BATSE/CGRO and the All-Sky Monitor on RXTE. We…
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