Early SPI/INTEGRAL measurements of 511 keV line emission from the 4th quadrant of the Galaxy

被引：287

作者：

Jean, P

Nnödlseder, J

Lonjou, V

Allain, M

Roques, JP

Skinner, GK

Teegarden, BJ

Vedrenne, G

von Ballmoos, P

Cordier, B

Caraveo, P

Diehl, R

Durouchoux, P

Mandrou, P

Matteson, J

Gehrels, N

Schönfelder, V

Strong, AW

Ubertini, P

Weidenspointner, G

Winkler, C

机构：

[1] Univ Toulouse 3, CESR, CNRS, F-31028 Toulouse 4, France

[2] NASA, LHEA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[3] Max Planck Inst Extraterr Phys, D-85740 Garching, Germany

[4] ESA, Estec, RSSD, NL-2201 AZ Noordwijk, Netherlands

[5] CNR, IAS, I-00133 Rome, Italy

[6] CEA Saclay, DSM, DAPNIA, SAp, F-91191 Gif Sur Yvette, France

[7] Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, CA 92093 USA

[8] CNR G Occhialini, IFC, I-20133 Milan, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 407卷 / 03期

关键词：

gamma rays : observations; line : profiles; Galaxy : center; GALACTIC-CENTER REGION; POSITRON-ANNIHILATION RADIATION; CENTER DIRECTION; SPECTRUM; SPECTROMETER;

D O I：

10.1051/0004-6361:20031056

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 the range of spatial distribution models which are consistent with the data, we derive a flux of 9.9(-2.1)(+4.7) x 10(-4) ph cm(-2) s(-1) and an intrinsic line width of 2.95(-0.51)(+0.45) keV (FWHM). The results are consistent with other high-spectroscopy measurements, though the width is found to be at the upper bound of previously reported values.

引用

页码：L55 / L58

页数：4

共 19 条

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