S2 passes pericentre and its light is measurably redshifted

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The star S2 made its closest approach to Sagittarius A*, passing within roughly 120 astronomical units at about two and a half per cent of the speed of light. Interferometric astrometry and spectroscopy with the GRAVITY instrument at Paranal detected the combined gravitational redshift and transverse Doppler shift predicted by general relativity, at a level clearly distinguishable from the Newtonian expectation. It was the first detection of that effect in the gravitational field of a supermassive black hole.

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Approaching a Black HoleSpace

Evidence · 1

Detection of the gravitational redshift in the orbit of the star S2 near the Galactic centre massive black hole

Timeline

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Connections · 4

Time dilation near a horizonevidence_for
S2 - the star that measured the Galactic centreconcerns
Sagittarius A* - the black hole at the centre of the Milky Wayconcerns
Paranal Observatory and the GRAVITY interferometerconcerns

Assembled narrative · 1

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Observed changes · 0

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/atlas?object=EVT_GRAVITY_REDSHIFT_2018