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Assigned ID: 797
----- Attempting Submission 1 (Fri Apr 08 20:40:17 GMT 2016) -----
0
----- Attempting Submission 1 (Mon Jul 18 18:48:15 GMT 2016) -----
Probing the circumgalactic medium of galaxies with deep observations.
The circumgalactic medium (CGM) of galaxies is critical for understanding galaxy
formation and evolution, the interplay between feedback and accretion, recycling
of metals, and an overall accounting of cosmic baryons. Several large, shallow HST
surveys have provided a major step in this direction, finding extended, massive,
metal bearing CGMs around star-forming galaxies. High ionization metal lines, such
as OVI and NeVIII, are particularly useful to probe the warm-hot gas which is
believed to contain most of the baryonic mass. However, these metal lines could be
produced in the hot gas in collisional ionization equilibrium, or in cooler
photoionized gas. This ambiguity can be resolved by using kinematic information.
At the expected temperature of 300,000K, the fraction of neutral hydrogen is small,
but detectable and the Lyman alpha line is thermally broadened to about 75 km/s.
Thus Broad Lyman Alpha (BLA) lines provide a useful tool to probe the hot gas, but
detecting BLAs require high S/N spectra. We propose high S/N COS G160M observations
of a carefully selected target to detect BLAs from CGMs of two galaxies to better
understand the physics of the CGM. With the proposed deep observations we will
directly measure the temperature, metallicity and mass of the warm-hot gas, providing
valuable input to models of galaxy formation. Such deep observations are crucial to
understand the results from shallow surveys that have used hundreds of HST orbits,
but the investment of time is still modest. With the 25 orbits allocated to this program we will
obtain S/N of about 25 at 1600 A.
We will be observing our target for 25 HST orbits with COS/FUV G160M.
Our goal is to detect broad, shallow, Ly alpha absorption.
Our target has been observed with COS/160M beofre, for a shallow observation,
so we know the overall spectral properties.
Target acquision: From the previous COS observations, we know the precise coordinates of the target.
Additionally, it's a SDSS target with precise coordinates. So we will use ACQ/Image with COS NUV/Mirror B.
Science observations: We will obtain COS FUV G160M spectra to detect BLAs from two intervening galaxies.
To cover the segments gaps, we will use two central wavelengths: 1577 and 1600. This will enable us to reach down to
1387 A, and cover OVI from one of the galaxies of interest.
We will use recommended parameter of FLASH=Yes. Instead of FP-POS=ALL, we will use FP-POS=1, followed by FP-POS=2, followed by FP-POS=3, followed by FP-POS=4 in subsequent orbits. This should help increase the S/N.
Galaxies
12
false
true
false
false
false
false
SUPPORTED
GALAXY
QSO
QUASAR
NO
This object was generated by the targetselector and retrieved from the SIMBAD database.
SDSSJ100902.07+071343.9
J2000
J2000
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COS/FUV
Spectroscopic
No
No
G160M
1600
COS/FUV
Spectroscopic
No
No
G160M
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