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  • Astronomy  (193)
  • 2005-2009  (193)
  • 2000-2004
  • 1995-1999
  • 2006  (193)
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  • 2005-2009  (193)
  • 2000-2004
  • 1995-1999
Year
  • 1
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    An X-ray Observation of the L1251 Dark Cloud (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-08-16
    Description: An X-ray image of the L1251 dark cloud in Cepheus was obtained with the XMM-Newton telescope. More than three dozen sources were detected above a 3 delta limit in X-ray luminosity of L(sub X = 10(exp 29) ergs/s. Among the detections are eight optically visible T Tauri stars, which had been identified in earlier work from their emission at H(alpha). The two strongest X-ray sources have steady luminosities of L(sub X) approx. 10(exp 31) ergs/s and are at the saturation limit for X-ray activity in late-type stars, L(sub X)/L(sub bol) approx. 10(exp -3). X-ray emission was also observed from two CO emission cores in L1251, core C (L1251A) and core E (L1251B). Both regions contain high-velocity molecular gas, bright IRAS sources (Class I protostars), thermal radio sources, and Herbig-Haro (HH) jets. In L1251A strong X-ray emission was discovered in close proximity to the near-inbred and radio source IRSA/VLA 7 and to IRAS 22343+7501. IRSA/VLA 7 thus appears to be the most likely source of the molecular and HH outflows in L1251A. In L1251B X-ray emission was observed from a visible T Tauri star, KP2-44, which is thought to be the driving source for HH 189. Also reported is the tentative detection of X-ray emission from VLA 3, a thermal radio continuum source in L1251B that is closely associated with the extreme Class I protostar IRAS 22376+7455.
    Keywords: Astronomy
    Type: The Astronomical Journal; 131; 501-511
    Format: text
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  • 2
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    Temporal Profiles and Spectral Lags of XRF 060218 (2006)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: The spectral and temporal properties of the nonthermal emission of the nearby XRF 060218 in the 0.3-150 keV band are studied. We show that both the spectral energy distribution and the light-curve properties suggest the same origin of the nonthermal emission detected by Swift BAT and XRT. This event has the longest pulse duration and spectral lag observed to date among the known GRBs. The pulse structure and its energy dependence are analogous to typical GRBs,. By extrapolating the observed spectral lag to the Compton Gamma Ray Observatory (CGRO) BATSE bands we find that the hypothesis that this event complies with the same luminosity-lag relation with bright GRBs cannot be ruled out at 2 sigma significance level. These intriguing facts, along with its compliance with the Amati relation, indicate that XRF 060218 shares the similar radiation physics as typical GRBs.
    Keywords: Astronomy
    Format: application/pdf
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  • 3
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    Complex Histories of Two Lunar Zircons as Evidenced by their Internal Structures and U-Pb Ages (2006)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The U-Pb dating of lunar zircon by ion-microprobe provides a robust technique for investigating the timing of lunar events [1,2]. However, we have now identified two cases where the U-Pb systems in a single zircon show more than one age. These complex zircons provide new opportunities for extending our knowledge on the timing of events in the early history of the Moon.
    Keywords: Astronomy
    Type: 37th Lunar and Planetary Science Conference; Mar 13, 2006 - Mar 17, 2006; League City, TX; United States
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  • 4
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    Adaptive Nulling for the Terrestrial Planet Finder Interferometer (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Deep, stable starlight nulls are needed for the direct detection of Earth-like planets and require careful control of the intensity and phases of the beams that are being combined. We are testing a novel compensator based on a deformable mirror to correct the intensity and phase at each wavelength and polarization across the nulling bandwidth. We have successfully demonstrated intensity and phase control using a deformable mirror across a 100nm wide band in the near-IR, and are in the process of conducting experiments in the mid-IR wavelengths. This paper covers the current results and in the mid-IR.
    Keywords: Astronomy
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  • 5
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    Chandra Observations of Isolated Neutron Stars (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: We present a review of the first six years of Chandra X-ray Observatory observations of isolated neutron stars. The outstanding spatial and spectral resolution of this great observatory have allowed for observations of unprecedented clarity and accuracy. Many of these observations have provided new insights into neutron star physics. We present a (biased) overview of six years of these observations, highlighting new discoveries made possible by the Observatory's unique capabilities.
    Keywords: Astronomy
    Type: Isolated Neutron Stars: From the Interior to the Surface; Apr 24, 2006 - Apr 28, 2006; London; United Kingdom
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  • 6
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    Prospects for GLAST (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: The Gamma-ray Large Area Space Telescope (GLAST), scheduled for launch in late 007, is a satellite based observatory to study the high energy gamma-ray sky. There are two instruments on GLAST: the Large Area Telescope (LAT) which provides coverage from 20 MeV to over 300 GeV, and the GLAST Burst Monitor (GBM) which provides supportive observations of transients from 8 keV to 30 MeV. GLAST will provide well beyond those achieved by the highly successful EGRET instrument on the Compton Gamma-Ray Observatory, with dramatic improvements in sensitivity, angular resolution and energy range. The very large field of view will make it possible to observe approx. 20% of the sky at any instant, and the entire sky on timescale of a few hours. This talk includes a description of the instruments, the opportunities for guest investigators, and the mission status.
    Keywords: Astronomy
    Type: 5th Stomlo Symposium; Dec 03, 2006 - Dec 08, 2006; Caberra; Australia
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  • 7
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    Suzaku Study of the Interstellar Medium of the Small Magellenic Cloud (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Suzaku was used to observe a region of the Small Magellenic Cloud devoid of bright point sources in order to study the hot interstellar medium in that galaxy. This hot, ionized gas presumably has its origin in supernovae and the winds of massive stars. Using Suzaku XIS data, we determined the temperature and abundances of this gas. A higher Ne abundance than O and Fe was determined, which is consistent with surveys of SMC super-nova remnants.
    Keywords: Astronomy
    Type: The Extreme Universe in the Suzaku Era; Dec 03, 2006 - Dec 10, 2006; Kyoto; Japan
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  • 8
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    Prompt Emission: Recent Results (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: We will present a summary of prompt emission from GRBs and recent results of the prompt emission from INTEGRAL, HETE, and Swift.
    Keywords: Astronomy
    Type: The Multicolored Landscape of Compact Objects and their Explosive Origins; Jun 11, 2006 - Jun 24, 2006; Cefalu; Italy
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  • 9
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    The Capabilities of the GLAST Large Area Telescope for Blazar Variability Studies (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: One of the more notable features of the Large Area Telescope (LAT) on GLAST is its extremely large field of view, which covers more than 20% of the sky at any instant. In survey mode the LAT will be rocked about the orbital plane to provide coverage of the entire gamma-ray sky above 20 MeV every three hours. This will be the default observing mode for the first year of operations and is likely to be the dominant observing mode throughout the rest of the mission. Thus the LAT will provide long, evenly sampled, gamma-ray lightcurves for a large number of sources. In this talk we describe the nature and quality of the data that will be provided by the LAT and use simulated lightcurves to illustrate some of the scientific questions that can be addressed with LAT observations.
    Keywords: Astronomy
    Type: Challenges of Relativistic Jets; Jun 25, 2006 - Jul 01, 2006; Cracow; Poland
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  • 10
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    Simplectic Correctors for Canonical Heliocentric N-Body Maps (2006)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Symplectic correctors are developed for n-body maps (symplectic integrators) in canonical heliocentric coordinates. Several correctors are explicitly presented.
    Keywords: Astronomy
    Type: The Astronomical Journal; 131; 1804; 2294-2298
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