[Paper Review] INTEGRAL: The Current Status

C B Winkler|arXiv (Cornell University)|Jan 8, 1999

Nuclear Physics and Applications3 citations

TL;DR

This paper presents the current status of the INTEGRAL mission, an ESA-led space observatory with contributions from Russia and NASA, designed for high-resolution gamma-ray spectroscopy (2 keV FWHM at 1.3 MeV) and imaging (12 arcmin FWHM) in the 15 keV–10 MeV energy range, complemented by X-ray and optical monitoring. It outlines the mission’s scientific goals, payload and spacecraft development, and ground segment infrastructure, emphasizing its role as a community observatory with open observing time for the scientific community.

ABSTRACT

The International Gamma-Ray Astrophysics Laboratory (INTEGRAL) is dedicated to the fine spectroscopy (Delta-E: 2 keV FWHM @ 1.3 MeV) and fine imaging (angular resolution: 12 arcmin FWHM) of celestial gamma-ray sources in the energy range 15 keV to 10 MeV with concurrent source monitoring in the X-ray (3 - 35 keV) and optical (V, 550 nm) range. The mission is conceived as an observatory led by ESA with contributions from Russia and NASA. The INTEGRAL observatory will provide to the science community at large an unprecedented combination of imaging and spectroscopy over a wide range of energies. Most of the observing time will be open to the scientific community. This paper summarises the key scientific goals of the mission, the current development status of the payload and spacecraft and it will give an overview of the science ground segment including data centre, science operations and the key elements of the observing programme

Motivation & Objective

• To summarize the scientific objectives of the INTEGRAL mission, focusing on fine spectroscopy and imaging of celestial gamma-ray sources in the 15 keV–10 MeV range.
• To report the current development status of the INTEGRAL payload and spacecraft as of late 1998.
• To describe the science ground segment, including data center, operations, and observing programme architecture.
• To communicate the mission's commitment to providing open observing time for the broader scientific community.
• To present the mission's role as a multi-wavelength observatory with concurrent X-ray and optical monitoring capabilities.

Proposed method

• Utilizing the International Gamma-Ray Astrophysics Laboratory (INTEGRAL) observatory, designed for high-energy astrophysics observations.
• Employing fine spectroscopy with a spectral resolution of 2 keV FWHM at 1.3 MeV to study nuclear lines and gamma-ray emission features.
• Applying fine imaging with 12 arcmin FWHM angular resolution to localize gamma-ray sources with high precision.
• Conducting concurrent monitoring in the X-ray band (3–35 keV) and optical band (V, 550 nm) to enable multi-wavelength source characterization.
• Implementing a community-based observing programme with open access to observing time for the scientific community.
• Establishing a comprehensive ground segment including data centres, science operations, and mission planning systems.

Experimental results

Research questions

• RQ1 What are the primary scientific goals of the INTEGRAL mission in the context of high-energy astrophysics?
• RQ2 What is the current technical and developmental status of the INTEGRAL payload and spacecraft as of 1998?
• RQ3 How is the science ground segment structured, and what are the key components of data handling and mission operations?
• RQ4 What mechanisms ensure broad community access to observing time on the INTEGRAL observatory?
• RQ5 How does the concurrent X-ray and optical monitoring capability enhance the scientific value of INTEGRAL's gamma-ray observations?

Key findings

• INTEGRAL achieves a spectral resolution of 2 keV FWHM at 1.3 MeV, enabling precise measurements of nuclear gamma-ray lines.
• The angular resolution of 12 arcmin FWHM allows for accurate source localization in the gamma-ray sky.
• The mission supports concurrent monitoring in the X-ray (3–35 keV) and optical (V, 550 nm) bands, enhancing multi-wavelength source studies.
• Most of the observing time on INTEGRAL is allocated to the broader scientific community through a peer-reviewed proposal system.
• The science ground segment includes a dedicated data centre and operations infrastructure to support mission science and data distribution.
• The mission is conceived as a multi-agency observatory led by ESA with significant contributions from Russia and NASA, ensuring international collaboration and resource sharing.