0
Assigned ID: 293
----- Attempting Submission 1 (Thu Apr 09 22:33:29 GMT 2015) -----
This is the first submission of phase 2 for this proposal but it has already been commented on by Julia Duval and Alison Vick.
244156671
----- Attempting Submission 1 (Sat Jul 11 23:21:41 GMT 2015) -----
Tracing the CMB Cold Spot supervoid using HI gas clouds
The Cosmic Microwave Background (CMB) Cold Spot, a ~100 sq. deg. area with abnormally low temperatures, remains one of the greatest anomalies of the cosmic microwave sky. If primordial in origin, it represents a 3-4 sigma fluctuation in a LCDM cosmology. The alternative possibility is that it is caused by the Integrated Sachs-Wolfe (ISW) effect where a foreground supervoid imparts a net gravitational redshift to the CMB photons as they pass through. Recently such a supervoid has been claimed to be detected in the galaxy distribution at z~0.2, with a ~300/h Mpc diameter, representing a 2 sigma fluctuation in the LCDM model. Our prime aim is to test if the void is independently detected in the intergalactic medium traced by HI Lyman alpha absorption. Two quasar sightlines at ~10deg from the Cold Spot centre have already been serendipitously observed by COS and these show a tentative (~3 sigma) deficiency of Lyman-alpha absorption lines (Mackenzie et al 2015). In order to test further this potentially exciting detection of the Cold Spot supervoid in absorption we propose to use COS to observe 4 more quasars within a few degrees of the Cold Spot centre. If the HI underdensity reproduces at the same level then this could provide a >4 sigma detection of the supervoid. Such a result would not only be vital for a cosmological explanation of the Cold Spot anomaly but also revolutionise our view of how hydrogen gas clouds trace dark matter underdensities on the largest scales.
We are going to observe 4 quasars with COS.
COSMOLOGY
12
false
false
false
false
SUPPORTED
GALAXY
QSO
QUASAR
NO
J2000
J2000
GALEX FUV AB=17.89, GALEX NUV AB=17.31
GALAXY
QSO
QUASAR
NO
J2000
J2000
GALEX FUV AB=18.25, GALEX NUV AB=17.49
GALAXY
QSO
QUASAR
NO
J2000
J2000
GALEX FUV AB=17.99, GALEX NUV AB=17.47
GALAXY
QSO
QUASAR
NO
J2000
J2000
GALEX FUV AB=17.82, GALEX NUV AB=17.44
COS/FUV
Spectroscopic
No
No
G160M
1577
COS/FUV
Spectroscopic
No
No
G160M
1577
COS/FUV
Spectroscopic
No
No
G160M
1577
COS/FUV
Spectroscopic
No
No
G160M
1577
/Users/tomshanks/Observing/hst_cos_23/OP-cache/apt_cos_14275-v01.xml
The scheduling data was generated by CASM 23.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 14275
:visit-id "01"
:proposal-version -1
:trans-version "20150609"
:date "09-Jul-2015 21:58:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 391536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14275
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14275
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2889
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "01"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3000
:al-overhead-at-end 0
:internal-dur-at-end 114
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "01"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3000
:al-overhead-at-end 0
:internal-dur-at-end 331
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)
true
3
0
/Users/tomshanks/Observing/hst_cos_23/OP-cache/apt_cos_14275-v02.xml
The scheduling data was generated by CASM 23.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 14275
:visit-id "02"
:proposal-version -1
:trans-version "20150609"
:date "09-Jul-2015 21:58:38.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 487280
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14275
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14275
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "02"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "02"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "02"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 331
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
true
4
0
/Users/tomshanks/Observing/hst_cos_23/OP-cache/apt_cos_14275-v03.xml
The scheduling data was generated by CASM 23.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 14275
:visit-id "03"
:proposal-version -1
:trans-version "20150609"
:date "09-Jul-2015 21:58:48.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 400272
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14275
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14275
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "03"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 331
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
true
2
0
/Users/tomshanks/Observing/hst_cos_23/OP-cache/apt_cos_14275-v04.xml
The scheduling data was generated by CASM 23.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 14275
:visit-id "04"
:proposal-version -1
:trans-version "20150609"
:date "09-Jul-2015 21:58:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 400272
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14275
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14275
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "04"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "04"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 331
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
true
3
0
/Users/tomshanks/Observing/hst_cos_23/OP-cache/apt_cos_14275-v05.xml
The scheduling data was generated by CASM 23.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 14275
:visit-id "05"
:proposal-version -1
:trans-version "20150609"
:date "09-Jul-2015 21:58:58.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 400272
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14275
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14275
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2888
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "05"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14275
:visit-id "05"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2999
:al-overhead-at-end 0
:internal-dur-at-end 331
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3221
:pcs-gap 0
)
true
3
0