Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL

G. Bélanger, A. Goldwurm, P. Goldoni, J. Paul, R. Terrier, M. Falanga, P. Ubertini, A. Bazzano, M. Del Santo, C. Winkler, A. N. Parmar, E. Kuulkers, K. Ebisawa, J. P. Roques, N. Lund, Fulvio Melia

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

This Letter presents the first results of an observational campaign to study the Galactic center with INTEGRAL, the International Gamma-Ray Astrophysics Laboratory. Mosaicked images were constructed using data obtained with ISGRI, the soft gamma-ray instrument of the coded aperture IBIS imager, in the energy ranges 20-40 and 40-100 keV. These give a yet unseen view of the high-energy sources of this region in hard X-rays and gamma rays with an angular resolution of 12′ (FWHM). We report on the discovery of a source, IGR J1745.6-2901, coincident with the Galactic nucleus Sgr A* to within 0′.9. Located at R.A. = 17h45m38s.5 (J2000.0), decl. = -29°01′15″ (J2000.0), the source is visible up to about 100 keV with a 20-100 keV luminosity at 8 kpc of (2.89 ± 0.41) × 1035 ergs s-1. Although the new INTEGRAL source cannot unequivocally be associated to the Galactic nucleus, this is the first report of significant hard X-ray emission from within the inner 10′ of the Galaxy and a contribution from the Galactic supermassive black hole itself cannot be excluded.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume601
Issue number2 II
StatePublished - Feb 1 2004

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galactic nuclei
gamma rays
astrophysics
laboratory astrophysics
erg
x rays
energy sources
angular resolution
rays
apertures
luminosity
galaxies
energy
detection
laboratory
energy source

Keywords

  • Black hole physics
  • Galaxy: center
  • Galaxy: nucleus
  • Gamma rays: observations
  • Stars: neutron
  • X-rays: binaries

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Bélanger, G., Goldwurm, A., Goldoni, P., Paul, J., Terrier, R., Falanga, M., ... Melia, F. (2004). Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL. Astrophysical Journal, 601(2 II).

Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL. / Bélanger, G.; Goldwurm, A.; Goldoni, P.; Paul, J.; Terrier, R.; Falanga, M.; Ubertini, P.; Bazzano, A.; Del Santo, M.; Winkler, C.; Parmar, A. N.; Kuulkers, E.; Ebisawa, K.; Roques, J. P.; Lund, N.; Melia, Fulvio.

In: Astrophysical Journal, Vol. 601, No. 2 II, 01.02.2004.

Research output: Contribution to journalArticle

Bélanger, G, Goldwurm, A, Goldoni, P, Paul, J, Terrier, R, Falanga, M, Ubertini, P, Bazzano, A, Del Santo, M, Winkler, C, Parmar, AN, Kuulkers, E, Ebisawa, K, Roques, JP, Lund, N & Melia, F 2004, 'Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL', Astrophysical Journal, vol. 601, no. 2 II.
Bélanger G, Goldwurm A, Goldoni P, Paul J, Terrier R, Falanga M et al. Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL. Astrophysical Journal. 2004 Feb 1;601(2 II).
Bélanger, G. ; Goldwurm, A. ; Goldoni, P. ; Paul, J. ; Terrier, R. ; Falanga, M. ; Ubertini, P. ; Bazzano, A. ; Del Santo, M. ; Winkler, C. ; Parmar, A. N. ; Kuulkers, E. ; Ebisawa, K. ; Roques, J. P. ; Lund, N. ; Melia, Fulvio. / Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL. In: Astrophysical Journal. 2004 ; Vol. 601, No. 2 II.
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abstract = "This Letter presents the first results of an observational campaign to study the Galactic center with INTEGRAL, the International Gamma-Ray Astrophysics Laboratory. Mosaicked images were constructed using data obtained with ISGRI, the soft gamma-ray instrument of the coded aperture IBIS imager, in the energy ranges 20-40 and 40-100 keV. These give a yet unseen view of the high-energy sources of this region in hard X-rays and gamma rays with an angular resolution of 12′ (FWHM). We report on the discovery of a source, IGR J1745.6-2901, coincident with the Galactic nucleus Sgr A* to within 0′.9. Located at R.A. = 17h45m38s.5 (J2000.0), decl. = -29°01′15″ (J2000.0), the source is visible up to about 100 keV with a 20-100 keV luminosity at 8 kpc of (2.89 ± 0.41) × 1035 ergs s-1. Although the new INTEGRAL source cannot unequivocally be associated to the Galactic nucleus, this is the first report of significant hard X-ray emission from within the inner 10′ of the Galaxy and a contribution from the Galactic supermassive black hole itself cannot be excluded.",
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AU - Bélanger, G.

AU - Goldwurm, A.

AU - Goldoni, P.

AU - Paul, J.

AU - Terrier, R.

AU - Falanga, M.

AU - Ubertini, P.

AU - Bazzano, A.

AU - Del Santo, M.

AU - Winkler, C.

AU - Parmar, A. N.

AU - Kuulkers, E.

AU - Ebisawa, K.

AU - Roques, J. P.

AU - Lund, N.

AU - Melia, Fulvio

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