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A bright X-ray source is found in Cygnus

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Sounding-rocket surveys carrying X-ray detectors above the atmosphere for a few minutes at a time found one of the brightest X-ray sources in the sky in the constellation Cygnus. Nothing about the detection identified the source as compact or unusual; X-ray astronomy at the time could not localise a source well enough to match it to anything visible. The identification took another seven years and required radio astronomy.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.

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Evidence · 1
Timeline

No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.

Connections · 1
Assembled narrative · 1

Assembled from 13 blocks · 1 evidence · 10 related

  1. Story
  2. Sounding-rocket surveys carrying X-ray detectors above the atmosphere for a few minutes at a time found one of the brightest X-ray sources in the sky in the constellation Cygnus. Nothing about the detection identified the source as compact or unusual; X-ray astronomy at the time could not localise a source well enough to match it to anything visible. The identification took another seven years and required radio astronomy.
  3. Knowledge
  4. Cygnus X-1
  5. A bright X-ray source is found in Cygnus
  6. Connections
  7. Cygnus X-1
  8. Accretion disc
  9. Stellar-mass black hole
  10. A bright X-ray source is found in Cygnus
  11. Cygnus X-1 is localised and weighed
  12. Evidence
  13. Revises the distance to Cygnus X-1 by radio parallax and with it the mass of the compact object, to approximately 21 solar masses. V55 VERIFICATION BASIS: not consulted in session; no research tool was available. Title wording, volume and page are from recall and must be checked; the near-maximal spin inference reported alongside is model-dependent.
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Observed changes · 0

No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.

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/atlas?object=EVT_CYGNUS_X1_DETECTED_1964&experience=EVT_CYGNUS_X1_DETECTED_1964