J. P. Roques

SPI observations of the diffuse ⁶⁰Fe emission in the galaxy

Gamma-ray line emission from radioactive decay of 60Fe provides constraints on nucleosynthesis in massive stars and supernovae. The spectrometer SPI on board INTEGRAL has accumulated nearly three years of data on gamma-ray emission from the Galactic plane. We have analyzed these data with suitable instrumental-background models and sky distributions to produce high-resolution spectra of Galactic emission. We detect the gamma-ray lines from 60Fe decay at 1173 and 1333 keV, obtaining an improvement over our earlier measurement of both lines with now 4.9 sigma significance for the combination of the two lines. The average flux per line is (4.4 \pm 0.9) \times 10^{-5} ph cm^{-2} s^{-1} rad^{-1} for the inner Galaxy region. Deriving the Galactic 26Al gamma-ray line flux with using the same set of observations and analysis method, we determine the flux ratio of 60Fe/26Al gamma-rays as 0.148 \pm 0.06. The current theoretical predictions are still consistent with our result.

INTEGRAL upper limits on gamma-ray emission associated with the gravitational wave event GW150914

Using observations of the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL), we place upper limits on the gamma-ray and hard X-ray prompt emission associated with the gravitational wave event GW150914, which was discovered by the LIGO/Virgo Collaboration. The omnidirectional view of the INTEGRAL/SPI-ACS has allowed us to constrain the fraction of energy emitted in the hard X-ray electromagnetic component for the full high-probability sky region of LIGO triggers. Our upper limits on the hard X-ray fluence at the time of the event range from

Three spectral states of 1E 1740.7-2942 : from standard Cygnus X-1 type spectrum to the evidence of electron-positron annihilation feature

{F}_{\gamma }=2\times {10}^{-8}

The High-Energy Emission of the Crab Nebula from 20 keV TO 6 MeV with Integral SPI

erg cm(−)(2) to

SIGMA/GRANAT soft gamma-ray observations of the X-ray nova in Musca : discovery of positron annihilation emission line

{F}_{\gamma }={10}^{-6}

Detection of γ-ray lines from interstellar 60Fe by the high resolution spectrometer SPI

erg cm(−)(2) in the 75 keV–2 MeV energy range for typical spectral models. Our results constrain the ratio of the energy promptly released in gamma-rays in the direction of the observer to the gravitational wave energy E

Radioactive 26Al from the Scorpius-Centaurus association

{}_{\gamma }/

Spectral and intensity variations of Galactic 26 Al emission

E

UNVEILING THE HIGH ENERGY TAIL OF 1E 1740.7-2942 WITH INTEGRAL *

{}_{\mathrm{GW}}\lt {10}^{-6}

First results from the INTEGRAL galactic plane scans

. We discuss the implication of gamma-ray limits for the characteristics of the gravitational wave source, based on the available predictions for prompt electromagnetic emission.