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Cold, clumpy accretion onto an active supermassive black hole.

Grant R Tremblay1,2, J B Raymond Oonk3,4, Françoise Combes5

  • 1Yale Center for Astronomy and Astrophysics, Yale University, 52 Hillhouse Avenue, New Haven, Connecticut 06511, USA.

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Summary
This summary is machine-generated.

Observations reveal cold, clumpy gas clouds fueling supermassive black hole growth in the Abell 2597 galaxy. This finding supports a

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Area of Science:

  • Astrophysics
  • Galaxy Evolution
  • Black Hole Accretion

Background:

  • Supermassive black holes grow by gas accretion, influencing galaxy-wide star formation.
  • Accretion models often simplify fuel supply as smooth, hot gas inflow.
  • Observational evidence for cold, clumpy accretion remains elusive.

Purpose of the Study:

  • To investigate the nature of gaseous fuel reservoirs powering black hole growth.
  • To provide observational support for clumpy accretion models.

Main Methods:

  • Utilized high-resolution observations of the Abell 2597 galaxy nucleus.
  • Analyzed the movement and shadows of cold molecular clouds near the central black hole.

Main Results:

  • Observed a cold, clumpy accretion flow of molecular clouds towards the supermassive black hole.
  • Detected molecular clouds falling inward at ~300 km/s, casting shadows.
  • Confirmed these clouds sustain both star formation and black hole accretion.

Conclusions:

  • The study provides the first unambiguous observational evidence for cold, clumpy accretion onto a supermassive black hole.
  • This mechanism challenges the 'hot mode' accretion model and highlights the importance of cold gas in galaxy centers.
  • The findings suggest a more complex picture of black hole growth and its feedback on galaxy evolution.