Triggering Big Bursts of Star Formation - Trisha Ashley (SETI Talks 2016)
Δημοσιεύτηκε στις 21 Οκτ 2016
Dwarf
galaxies tend to form stars inefficiently. Yet, blue compact dwarf
(BCD) galaxies are a subset of dwarf galaxies that have intense and
concentrated star formation (compared to typical dwarf galaxies). BCDs
are thought to require a large disturbance to trigger their burst of
star formation. A common theory is that the enhanced star formation in a
BCD is the result of an interaction with another galaxy or a
dwarf-dwarf galaxy merger. However, many BCDs are relatively isolated
from other galaxies, making an interaction or a merger a less likely
starburst trigger.
As part of the atomic hydrogen dwarf galaxy
survey, LITTLE THINGS*, Dr. Ashley has studied the gaseous properties of
six BCDs. Atomic hydrogen data allow us to explore the velocity fields
and morphologies of the gas in BCDs, which may contain signatures of
star formation triggers, such as gas consumption, a past merger, and
interaction with previously undetected companions. If BCDs have formed
through gas consumption or dwarf-dwarf mergers, then they would be
useful analogs for galaxy formation in the early universe. Also,
learning which large disturbance has triggered the burst of star
formation in BCDs could be useful for understanding and modeling
how/whether BCDs evolve into/from other types of dwarf galaxies.
galaxies tend to form stars inefficiently. Yet, blue compact dwarf
(BCD) galaxies are a subset of dwarf galaxies that have intense and
concentrated star formation (compared to typical dwarf galaxies). BCDs
are thought to require a large disturbance to trigger their burst of
star formation. A common theory is that the enhanced star formation in a
BCD is the result of an interaction with another galaxy or a
dwarf-dwarf galaxy merger. However, many BCDs are relatively isolated
from other galaxies, making an interaction or a merger a less likely
starburst trigger.
As part of the atomic hydrogen dwarf galaxy
survey, LITTLE THINGS*, Dr. Ashley has studied the gaseous properties of
six BCDs. Atomic hydrogen data allow us to explore the velocity fields
and morphologies of the gas in BCDs, which may contain signatures of
star formation triggers, such as gas consumption, a past merger, and
interaction with previously undetected companions. If BCDs have formed
through gas consumption or dwarf-dwarf mergers, then they would be
useful analogs for galaxy formation in the early universe. Also,
learning which large disturbance has triggered the burst of star
formation in BCDs could be useful for understanding and modeling
how/whether BCDs evolve into/from other types of dwarf galaxies.
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