B. J. Teegarden
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View article: The sky distribution of 511 keV positron annihilation line emission as measured with INTEGRAL/SPI
The sky distribution of 511 keV positron annihilation line emission as measured with INTEGRAL/SPI Open
The imaging spectrometer SPI on board ESA's INTEGRAL observatory provides us with an unprecedented view of positron annihilation in our Galaxy. The first sky maps in the 511 keV annihilation line and in the positronium continuum from SPI s…
View article: The sky distribution of 511 keV positron annihilation line emission as measured with INTEGRAL/SPI
The sky distribution of 511 keV positron annihilation line emission as measured with INTEGRAL/SPI Open
The imaging spectrometer SPI on board ESA’s INTE-GRAL observatory provides us with an unprecedented view of positron annihilation in our Galaxy. The first sky maps in the 511 keV annihilation line and in the positronium continuum from SPI …
View article: The sky distribution of positronium annihilation continuum emissionmeasured with SPI/INTEGRAL
The sky distribution of positronium annihilation continuum emissionmeasured with SPI/INTEGRAL Open
We present a measurement of the sky distribution of positronium (Ps) annihilation continuum emission obtained with the SPI spectrometer on board ESA's INTEGRAL observatory. The only sky region from which significant Ps continuum emission i…
View article: The all-sky distribution of 511 keV electron-positron annihilation emission
The all-sky distribution of 511 keV electron-positron annihilation emission Open
\n We present a map of 511 keV electron-positron annihilation emission, \nbased on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL\ngamma-ray observatory,\nthat covers approximately ~$95\\%$ of the celestial sphere.\nWithi…
View article: The INTEGRAL mission – an overview
The INTEGRAL mission – an overview Open
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View article: <i>INTEGRAL</i>SPI Limits on Electron‐Positron Annihilation Radiation from the Galactic Plane
<i>INTEGRAL</i>SPI Limits on Electron‐Positron Annihilation Radiation from the Galactic Plane Open
The center of our Galaxy is a known strong source of electron-positron 511- keV annihilation radiation. Thus far, however, there have been no reliable detections of annihilation radiation outside of the central radian of our Galaxy. One of…
View article: SPI observations of positron annihilation radiation from the 4th galactic quadrant: Spectroscopy
SPI observations of positron annihilation radiation from the 4th galactic quadrant: Spectroscopy Open
The status of the analysis of the electron/positron annihilation radiation performed by INTEGRAL/SPI in the 4th GALACTIC QUADRANT is reported. We use data from the first two Galactic Center Deep Exposures (GCDE) and from the Galactic Plane…
View article: SPI observations of positron annihilation radiation from the 4th galactic quadrant: sky distribution
SPI observations of positron annihilation radiation from the 4th galactic quadrant: sky distribution Open
During its first year in orbit the INTEGRAL observatory performed deep exposures of the Galactic Center region and scanning observations of the Galactic plane. We report on the status of our analysis of the positron annihilation radiation …
View article: SPI Measurements of the Diffuse Galactic Hard X-ray Continuum
SPI Measurements of the Diffuse Galactic Hard X-ray Continuum Open
INTEGRAL Spectrometer SPI data from the first year of the Galactic Centre Deep Exposure has been analysed for the diffuse continuum from the Galactic ridge. A new catalogue of sources from the INTEGRAL Imager IBIS has been used to account …
View article: SPI instrumental background characteristics
SPI instrumental background characteristics Open
In its space environment the INTEGRAL observatory is subject to an intense irradiation by energetic cosmic-ray particles that leads, via nuclear interactions with the telescope and spacecraft materials, to an important background of false …
View article: First identification and modelling of SPI background lines
First identification and modelling of SPI background lines Open
\n On Oct. 17, 2002, the ESA INTEGRAL observatory was launched into a\nhighly elliptical orbit. SPI, a high resolution Ge spectrometer\ncovering an energy range of 20–8000 keV, is one of its two main\ninstruments. We use data recorded earl…
View article: INTEGRAL/SPI ground calibration
INTEGRAL/SPI ground calibration Open
\n Three calibration campaigns of the spectrometer SPI have\nbeen performed before launch in order to determine the instrument\ncharacteristics, such as the effective detection area, the\nspectral resolution and the angular resolution. Abs…
View article: Monte Carlo simulations and generation of the SPI response
Monte Carlo simulations and generation of the SPI response Open
\n In this paper we discuss the methods developed for \nthe production of the INTEGRAL/SPI instrument\nresponse. The response files were produced using a suite of \nMonte Carlo simulation software developed at\nNASA/GSFC based on the GEANT…
View article: The INTEGRAL mission
The INTEGRAL mission Open
The ESA observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory) is dedicated to the fine spectroscopy (2.5 keV FWHM @ 1 MeV) and fine imaging (angular resolution: 12 arcmin FWHM) of celestial gamma-ray sources in the energy …
View article: Diffuse continuum emission from the inner Galaxy: First results from INTEGRAL/SPI
Diffuse continuum emission from the inner Galaxy: First results from INTEGRAL/SPI Open
We present a preliminary analysis of the diffuse hard X- and soft γ-ray continuum emission from the inner Galactic ridge using INTEGRAL/SPI data from the first Galactic Plane Deep Exposure and Galactic Plane Scans. The spectrum is consiste…
View article: SPI: The spectrometer aboard INTEGRAL
SPI: The spectrometer aboard INTEGRAL Open
SPI is a high spectral resolution gamma-ray telescope on board the ESA mission INTEGRAL (International Gamma Ray Astrophysics Laboratory). It consists of an array of 19 closely packed germanium detectors surrounded by an active anticoincid…
View article: Early SPI/INTEGRAL constraints on the morphology of the 511 keV line emission in the 4th galactic quadrant
Early SPI/INTEGRAL constraints on the morphology of the 511 keV line emission in the 4th galactic quadrant Open
We provide first constraints on the morphology of the 511 keV line emission from the galactic centre region on basis of data taken with the spectrometer SPI on the INTEGRAL gamma-ray observatory. The data suggest an azimuthally symmetric g…
View article: SPI/INTEGRAL observation of the Cygnus region
SPI/INTEGRAL observation of the Cygnus region Open
\n We present the analysis of the first observations of the Cygnus region by the SPI spectrometer onboard the Integral Gamma Ray Observatory, encompassing ${\\sim}$600 ks of data. Three sources namely Cyg X-1, Cyg X-3 and EXO 2030+375 were…
View article: SPI-specific analysis method and software overview
SPI-specific analysis method and software overview Open
The SPI spectrometer on INTEGRAL features a camera system with 19 Ge detector modules, imaging photons through a tungsten coded mask. Background is reduced by an anticoincidence detector system surrounding these. The specifics of this inst…
View article: Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy
Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy Open
We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (International Gamma-Ray Astrophysics Laboratory). Taking into account…
View article: Discovery of a New Nearby Star
Discovery of a New Nearby Star Open
We report the discovery of a nearby star with a very large proper motion of 5.06 +/- 0.03 arcsec/yr. The star is called SO025300.5+165258 and referred to herein as HPMS (high proper motion star). The discovery came as a result of a search …
View article: Calibration of the spectrometer aboard the INTEGRAL satellite
Calibration of the spectrometer aboard the INTEGRAL satellite Open
SPI, the Spectrometer on board the ESA INTEGRAL satellite, to be launched in October 2002, will study the gamma-ray sky in the 20 keV to 8 MeV energy band with a spectral resolution of 2 keV for photons of 1 MeV, thanks to its 19 germanium…
View article: Transient Gamma‐Ray Spectrometer Observations of Gamma‐Ray Lines from Novae. III. The 478 keV Line from<sup>7</sup>Be Decay
Transient Gamma‐Ray Spectrometer Observations of Gamma‐Ray Lines from Novae. III. The 478 keV Line from<sup>7</sup>Be Decay Open
The Wind spacecraft, which carries the Transient Gamma Ray Spectrometer (TGRS), moves in an extremely elliptical orbit that largely avoids Earth's trapped radiation belts and albedo γ-radiation. The TGRS therefore enjoys a relatively low l…
View article: Transient Gamma Ray Spectrometer Measurements of Gamma-Ray Lines from Novae. III. The 478 keV Line from 7Be Decay
Transient Gamma Ray Spectrometer Measurements of Gamma-Ray Lines from Novae. III. The 478 keV Line from 7Be Decay Open
The "Wind" spacecraft carrying the Transient Gamma Spectrometer (TGRS) moves in an extremely elliptical orbit that largely avoids Earth's trapped radiation belts and albedo gamma-radiation. The TGRS therefore enjoys a relatively low level …
View article: High‐Resolution Spectroscopy of Gamma‐Ray Bursts with the Transient Gamma‐Ray Spectrometer
High‐Resolution Spectroscopy of Gamma‐Ray Bursts with the Transient Gamma‐Ray Spectrometer Open
A search for spectral lines in gamma-ray bursts detected with the Transient Gamma-Ray Spectrometer has been unable to confirm their existence. The spectrometer, aboard the Wind spacecraft, has detected gamma-ray bursts and other transients…
View article: Transient Gamma-Ray Spectrometer Measurements of the Positron Annihilation Spectrum from the Galactic Center
Transient Gamma-Ray Spectrometer Measurements of the Positron Annihilation Spectrum from the Galactic Center Open
We have obtained spectra of the Galactic center at energies 400-600 keV from high-resolution data acquired by the TGRS Ge spectrometer on board the WIND mission during 1995-1997. The data were obtained using an on-board occulter, and are r…
View article: TGRS Observation of the Galactic Center Annihilation Line
TGRS Observation of the Galactic Center Annihilation Line Open
The TGRS (Transient Gamma-Ray Spectrometer) experiment is a high-resolution germanium detector launched on the WIND satellite on Nov. 1, 1994. Although primarily intended to study gamma-ray bursts and solar flares, TGRS also has the capabi…
View article: BATSE Gamma-Ray Burst Line Search. IV. Line Candidates from the Visual Search
BATSE Gamma-Ray Burst Line Search. IV. Line Candidates from the Visual Search Open
We evaluate the significance of the line candidates identified by a visual search of burst spectra from BATSE's Spectroscopy Detectors. None of the candidates satisfy our detection criteria: an F-test probability less than 10^-4 for a feat…
View article: BATSE Gamma-Ray Burst Line Search. III. Line Detectability
BATSE Gamma-Ray Burst Line Search. III. Line Detectability Open
We evaluate the ability of the BATSE spectroscopy detectors to detect the absorption lines observed by Ginga in gamma ray burst spectra. We find that BATSE can detect the 20.6 keV line in the S1 segment of GB870303 with a detection probabi…
View article: BATSE observations of gamma-ray burst spectra. 2: Peak energy evolution in bright, long bursts
BATSE observations of gamma-ray burst spectra. 2: Peak energy evolution in bright, long bursts Open
We investigate spectral evolution in 37 bright, long gamma-ray bursts observed with the BATSE Spectroscopy Detectors. High resolution spectra are characterized by the energy of the peak of νFν and the evolution of this quantity is examined…