Two orbits of repeated observations are approved becaused of failed exposures in visit C1.
We add visit E1 and also change the FP positions in visit A1.
----- Attempting Submission 3 (Wed Dec 22 00:50:49 GMT 2010) -----
No obvious problems are noticed.
Reionization of Intergalactic Helium at the Highest Redshifts
In recent years, the number of quasars with clear sightlines to HeII Ly-alpha has more than tripled, enabling us to map IGM reionization between z=2.5-3.9. We propose COS/G140L spectroscopy for four quasars at z~3.5-3.9, as the brightest in the highest redshift range ever studied. We aim to probe the "penumbra" of the IGM's "dark ages" at the epoch of He II reionization, providing the longest trace yet of reionization history. The proposed quality COS spectra will reveal features of the patchy and rapidly evolving IGM helium ionization near this epoch; COS resolution may also reveal a predicted spectral signature that would establish the redshift of HeII reionization, disentangling the effects of damped absorption, associated absorbers, and proximity zones. The broad wavelength coverage of G140L will enable us to trace helium absorption all the way to the Lyman limit at 228*(1+z) A, and comparison of the four sightlines will unravel the effects of cosmic variance.
Our proposed study of z>3.4 quasars complements ongoing COS GTO and GO programs for z<3.3, and will add enormously to our understanding of the fluctuations in the patchy HeII Ly-alpha IGM optical depth, the growth in opacity to higher redshifts, and may reveal the onset epoch/redshift of IGM HeII reionization. By analogy, our study of HeII reionization may also shed light on the morphology of hydrogen reionization between z~6-10.
We select buffer times slightly shorter than the respective exposure times. Several FP positions are chosen to reduce the effect of fixed-pattern noise. Grating setting of 1105 and 1290 are used for two targets, to avoid a wavelength gap and to cover as short wavelengths as possible.
Two of the C1 exposures failed. Upon the approval of HOPR request 1828, these two exposures will be repeated in visit E1.
In visit A1, the FP positions are changed for exposure 5 and 6.
QUASAR ABSORPTION LINES AND IGM
12
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SUPPORTED
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
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NUCLEUS
9.4E-17 ergs/cm2/s/A at 1400A
J2000
12 53 53.7100
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J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
IGM
NUCLEUS
3.7E-17 ergs/cm2/s/A at 1550A
J2000
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J2000
EXT-MEDIUM
ABSORPTION LINE SYSTEM - EXTRAGALACTIC
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COS/FUV
Spectroscopic
No
No
G140L
1105
COS/FUV
Spectroscopic
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No
G140L
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COS/FUV
Spectroscopic
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G140L
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COS/FUV
Spectroscopic
No
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G140L
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