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; F. Melia

doi:10.1086/381738

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, F. Melia

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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. = 17^h45^m38^s.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 language	English (US)
Pages (from-to)	L163-L166
Journal	Astrophysical Journal
Volume	601
Issue number	2 II
DOIs	https://doi.org/10.1086/381738
State	Published - Feb 1 2004

Keywords

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

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/381738

Cite this

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, F. (2004). Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL. Astrophysical Journal, 601(2 II), L163-L166. https://doi.org/10.1086/381738

@article{11a7d1f6399b48e382e1a51eb9c55524,

title = "Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL",

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.",

keywords = "Black hole physics, Galaxy: center, Galaxy: nucleus, Gamma rays: observations, Stars: neutron, X-rays: binaries",

author = "G. B{\'e}langer and A. Goldwurm and P. Goldoni and J. Paul and R. Terrier and M. Falanga and P. Ubertini and A. Bazzano and {Del Santo}, M. and C. Winkler and Parmar, {A. N.} and E. Kuulkers and K. Ebisawa and Roques, {J. P.} and N. Lund and F. Melia",

note = "Funding Information: 1 Based on observations with INTEGRAL, an ESA project with instruments and science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), the Czech Republic, and Poland, and with the participation of Russia and the US. 2Service d{\textquoteright}Astrophysique, DAPNIA/DSM/CEA, 91191 Gif-sur-Yvette, France; belanger@cea.fr. 3IASFC-CNR, I-00133 Rome, Italy; ubertini@rm.iasf.cnr.it. 4ESA, ESTEC, NL-2200 AG Noordwijk, Netherlands; christoph.winkler@ rssd.esa.int. 5ISDC, CH-1290 Versoix, Switzerland; ebisawa@obs.unige.ch. 6CESR, Toulouse Cedex 4, France; roques@sigma-0.cesr.cnes.fr. 7DSRI, DK-2100 Copenhagen {\O}, Denmark; nl@dsri.dk. 8Department of Physics and Steward Observatory, University of Arizona, Tucson, AZ 85721; melia@physics.arizona.edu.",

year = "2004",

month = feb,

day = "1",

doi = "10.1086/381738",

language = "English (US)",

volume = "601",

pages = "L163--L166",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "2 II",

}

TY - JOUR

T1 - Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL

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, F.

N1 - Funding Information: 1 Based on observations with INTEGRAL, an ESA project with instruments and science data center funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), the Czech Republic, and Poland, and with the participation of Russia and the US. 2Service d’Astrophysique, DAPNIA/DSM/CEA, 91191 Gif-sur-Yvette, France; belanger@cea.fr. 3IASFC-CNR, I-00133 Rome, Italy; ubertini@rm.iasf.cnr.it. 4ESA, ESTEC, NL-2200 AG Noordwijk, Netherlands; christoph.winkler@ rssd.esa.int. 5ISDC, CH-1290 Versoix, Switzerland; ebisawa@obs.unige.ch. 6CESR, Toulouse Cedex 4, France; roques@sigma-0.cesr.cnes.fr. 7DSRI, DK-2100 Copenhagen Ø, Denmark; nl@dsri.dk. 8Department of Physics and Steward Observatory, University of Arizona, Tucson, AZ 85721; melia@physics.arizona.edu.

PY - 2004/2/1

Y1 - 2004/2/1

N2 - 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.

AB - 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.

KW - Black hole physics

KW - Galaxy: center

KW - Galaxy: nucleus

KW - Gamma rays: observations

KW - Stars: neutron

KW - X-rays: binaries

UR - http://www.scopus.com/inward/record.url?scp=1842428741&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1842428741&partnerID=8YFLogxK

U2 - 10.1086/381738

DO - 10.1086/381738

M3 - Article

AN - SCOPUS:1842428741

SN - 0004-637X

VL - 601

SP - L163-L166

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

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

Abstract

Keywords

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