Physics of the Cosmos
Exploring fundamental questions regarding the physical forces of the universe

Program News and Announcements

29 November 2023

Chandra Legacy Program Call for White Papers, due 22 January 2024

In its nearly 25-year history, the Chandra X-ray Observatory has revolutionized X-ray astronomy. Each year brings exciting results along with highly oversubscribed requests for new observations. With Chandra’s legacy secure, it is nonetheless necessary to ask this question:

Are there major initiatives (science challenges) for which the capabilities of Chandra are absolutely required to address fundamental questions about our current understanding of the components and evolution of the Universe, and which would represent a crucial missed opportunity if they are not completed during Chandra's lifetime?

It is with this question in mind that we announce plans for a Chandra Legacy Program (CLP). The goal of the program is to provide the community with crucial results that only Chandra can produce and that will break new scientific ground and/or complement new and far-reaching observations in other wavelength regimes. Development of the CLP will be a multi-stage process that begins with this Announcement/Call for White Papers to select the topics for the CLP. A subsequent, fully open, Call for Proposals will be used to select the actual targets for implementing the CLP. Programs that can be accomplished under existing Chandra Calls are not a focus of this program.

Essential considerations in defining the program include:

  • Use of Chandra's unique capabilities (e.g., high angular resolution, high-resolution grating spectroscopy, faint point-source sensitivity).
  • Science themes in support of the 2020 Decadal Survey.
  • Synergies with current observing facilities.
  • Stage-setting for next-generation X-ray facilities and investigations.

White papers on CLP are due by 22 January 2024. More details on the CLP process can be found on its webpage.

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