Grants and Contracts Details
Description
Science Category: Extra Galactic: Galaxy clusters/Lensing clusters
Observing Modes: Pacs Line Spectroscopy, Pacs Photometer, Spire
Photomete r
Hours Requested: 140.5
Abstract:
A major cosmological event is the formation of first massive galaxies,
which evolve to the luminous elliptical galaxies of today. Star formation
in these galaxies was regulated and ultimately stifled by energetic AGN
feedback processes, according to simulations. However, the nature of
these processes is open to speculation because at these enormous
distances, observations provide few constraints. Similar processes occur
in some low redshift galaxy clusters where star formation and cold gas is
detected in and around the brightest cluster galaxies. These modern-day
analogs provide us with the opportunity to understand the heating, cooling,
and star formation that occur on a grand scale at high redshift. In this
Herschel Key Project, we will determine the location and mass of cooled
gas, along with its temperature, ionization state, density and cooling rate.
These new data, only possible with Herschel, are supplemented by radio,
X-ray, and optical studies of the stars, hot gas, and AGN activity. To
accomplish our goals, we will use PACSto measure the line strengths of
[01], [Dill], [Nil], [CII] and [Sil], major coolants at low temperatures that
also reflect the ionization state of the gas. The requested PACSand
SPIREphotometry will determine the distribution of dust temperatures
and masses, including the detection of the coolest gas clouds. These
datasets will reveal the pathway from the hot ambient medium to cool gas
to star formation, a process that was widespread when the universe was
young.
Status | Finished |
---|---|
Effective start/end date | 4/1/11 → 9/30/12 |
Funding
- Jet Propulsion Laboratory: $38,367.00
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