The Swift X-ray monitoring campaign of the center of the Milky Way

N. Degenaar, R. Wijnands, J. M. Miller, M. T. Reynolds, J. Kennea, N. Gehrels

Research output: Contribution to journalReview articlepeer-review

25 Scopus citations


In 2006 February, shortly after its launch, Swift began monitoring the center of the Milky Way with the on board X-Ray Telescope using short 1-ks exposures performed every 1-4 days. Between 2006 and 2014 over 1200 observations have been obtained, accumulating to ≃1.3 Ms of exposure time. This has yielded a wealth of information about the long-term X-ray behavior of the supermassive black hole Sgr A*, and numerous transient X-ray binaries that are located within the 25'×25' region covered by the campaign. In this review we highlight the discoveries made during these first nine years, which include 1) the detection of seven bright X-ray flares from Sgr A*, 2) the discovery of the magnetar SGR J1745-29, 3) the first systematic analysis of the outburst light curves and energetics of the peculiar class of very-faint X-ray binaries, 4) the discovery of three new transient X-ray sources, 5) the exposure of low-level accretion in otherwise bright X-ray binaries, and 6) the identification of a candidate X-ray binary/millisecond radio pulsar transitional object. We also reflect on future science to be done by continuing this Swift's legacy campaign, such as high-cadence monitoring to study how the interaction between the gaseous object 'G2' and Sgr A* plays out in the future.

Original languageEnglish (US)
Pages (from-to)137-147
Number of pages11
JournalJournal of High Energy Astrophysics
StatePublished - Sep 1 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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