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Related Experiment Video

Updated: Apr 5, 2026

Bringing the Visible Universe into Focus with Robo-AO

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

A giant protogalactic disk linked to the cosmic web.

D Christopher Martin¹, Mateusz Matuszewski¹, Patrick Morrissey¹

¹Cahill Center for Astrophysics, California Institute of Technology, 1216 East California Boulevard, Mail code 278-17, Pasadena, California 91125, USA.

|August 7, 2015

Summary

Scientists discovered a massive, rotating gas disk near QSO UM287, suggesting it’s a giant protogalactic structure fueled by a cold accretion flow. This finding provides new insights into galaxy formation and the cosmic web.

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Area of Science:

Cosmology
Astrophysics
Galaxy Formation

Background:

Galaxy formation mechanisms and fueling by the intergalactic medium are not fully understood.
Hydrodynamic simulations propose cold accretion flows as a key process, channeling gas along cosmic web filaments into dark matter halos.
These flows are hypothesized to build circumgalactic structures that eventually form galaxies.

Purpose of the Study:

To investigate the physical characteristics and kinematics of a luminous filament discovered near QSO UM287.
To determine the nature of the bright emission and its connection to galaxy formation processes.
To test the hypothesis that the filament represents a cold accretion flow.

Main Methods:

Conducted a two-dimensional spectroscopic investigation of the emitting structure near QSO UM287.
Analyzed the velocity profile of the gas within the filament.
Constrained the mass of the associated dark matter halo.

Main Results:

Identified the brightest emission region as an extended, rotating hydrogen disk.
The disk's velocity profile is consistent with gas within a dark matter halo of 10(13) solar masses.
The protogalactic disk appears connected to a quiescent filament extending beyond the halo's virial radius.

Conclusions:

The observed structure strongly suggests a cold accretion flow fueling a massive protogalactic disk.
This provides observational evidence supporting theoretical models of galaxy formation via cold accretion.
The findings offer new insights into the role of cosmic web filaments in supplying gas to early galaxies.