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Tidal Streams

All articles tagged with #tidal streams

Long-Exposure Imaging Reveals Hidden Tidal Streams in the Sombrero Galaxy
science1 day ago

Long-Exposure Imaging Reveals Hidden Tidal Streams in the Sombrero Galaxy

A new deep-space image of the Sombrero Galaxy (M104) reveals faint stellar structures and tidal streams that suggest a violent history of galactic collisions. Captured over seven days in Namibia in mid-2026, the long-exposure photograph shows a hazy halo extending beyond the galaxy's central disk, containing a distinct diagonal ring. These features, invisible in shorter exposures, provide evidence that M104 formed through the merger of smaller galaxies. The galaxy is located approximately 30 million light-years away and spans about 150,000 light-years across.

Gaia Uncovers a Black-Hole Swarm in Palomar 5, Destined to Dissolve
science7 months ago

Gaia Uncovers a Black-Hole Swarm in Palomar 5, Destined to Dissolve

Gaia data reveal Palomar 5, a Milky Way globular cluster with an extensive tidal stream, may host over 100 stellar-mass black holes, making up about 20% of the cluster’s mass. Detailed simulations that include these black holes show they can eject stars into the cluster’s tidal tails, hastening its dissolution into a stream of black holes that will orbit the galactic center in around a billion years. The finding suggests such black-hole-rich clusters may be common and could be important for understanding black-hole mergers.