----- Attempting Submission 1 (Tue May 08 00:21:46 GMT 2007) -----
Assigned ID: 201
----- Attempting Submission 1 (Fri Jan 26 07:48:43 GMT 2007) -----
Phase I Proposal 201 (heii_final) successfully submitted.
----- Attempting Submission 4 (Wed Feb 07 23:18:28 GMT 2007) -----
New Sightlines for the Study of Intergalactic Helium: Dozens of High-Confidence, UV-Bright Quasars from SDSS/GALEX
The reionization of IGM helium is thought to have occurred at redshifts of z=3 to 4. Detailed study of HeII Lyman-alpha absorption toward a handful of QSOs at 2.7<z<3.3 demonstrated the high potential of such IGM probes, but the critically small sample size limits confidence in cosmological inferences. The requisite unobscured sightlines to high-z are extremely rare, but SDSS provides 5800, z>3.1 QSOs potentially suitable for HeII studies. We've cross-correlated SDSS quasars with GALEX UV sources to obtain dozens of new, high confidence, candidate sightlines (z=3.1-4.9) potentially useful for detailed HeII studies with HST. We propose brief, 2-orbit reconnaissance ACS SBC prism exposures toward each of the best dozen new quasars, to definitively verify UV flux down to HeII. Our combined SDSS/GALEX selection insures a high confirmation rate, as the quasars are already known to be UV bright in GALEX. Our program will provide a statistical sample of HeII sightlines extending to high redshift, enabling future long exposure follow-up spectra with the SBC prism, or superb quality COS or STIS spectra after SM4. Stacks of our prism spectra will also directly yield ensemble information. Ultimately, the new sightlines will enable confident measures of the spectrum and evolution of the ionizing background, the evolution of HeII opacity, the epoch of helium reionization, and the density of IGM baryons.
We wil observe 12 z>3.1 quasars selected from SDSS and GALEX, using ACS/SBC PR130L to confirm UV flux (dtected in GALEX) down to the HeII Lyman-alpha break. Two dither positions are used, with direct images at each dither position to correlate with the prism exposures. The last prism exposire in each orbit may be adjusted in length to fill the orbit.
Basic UV bright object safety data information is included in the comments for each target based on GALEX UV imaging photometry of each target/field. 5-band SDSS imaging photometry is also available in the optical for all targets/fields (Each quasar target has an SDSS optical spectrum available as well).
QUASAR ABSORPTION LINES AND IGM
12
false
0.0
false
false
false
false
false
false
SUPPORTED
GALAXY
QSO
QUASAR
Brightest GALEX GR2 sources within 0.6' radius are:
FUV: quasar target (m=20.5)
NUV: quasar target (m=19.6)
u=22.2, g=20.2,r=19.0,i=18.9,z=18.8,GALEXfuv=20.5,nuv=19.6
J2000
08 56 24.9200
+10 20 17.00
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' are:
FUV: quasar target (m=22.1)
NUV: quasar target (m=21.8)
u=25.5,g=21.3,r=19.4,i=19.0,z=18.9,GALEXfuv=22.1,nuv=21.8
J2000
09 22 56.2000
+56 18 49.40
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radius are:
FUV: no detection
NUV: quasar target (m=22.0)
u=21.8,g=20.7,r=19.4,i=19.4,z=19.2,GALEXnuv=22.0
J2000
09 57 55.6400
-00 20 27.50
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radius are:
FUV: quasar target (m=22.2)
NUV: quasar target (m=20.3)
u=19.7,g=17.9,r=17.8,i=17.7,z=17.7,GALEXfuv=22.2,nuv=20.3
J2000
10 06 10.5500
+37 05 13.80
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radius are:
FUV: no detection
NUV: quasar target (m=22.0)
u=22.6,g=20.3,r=18.8,i=18.6,z=18.6,GALEXnuv=22.0
J2000
12 16 13.6500
+43 50 24.30
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radius are:
FUV: no detection
NUV: quasar target (m=21.4)
u=23.8,g=20.3,r=19.5,i=19.2,z=19.4,GALEXnuv=21.4
J2000
12 24 15.2700
+07 58 46.90
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' are:
FUV: m=20.4
NUV:m=19.7 (offset from quasar by 0.45')
u=18.8,g=17.7,r=17.5,i=17.5,z=17.4,GALEXfuv=21.5,nuv=21.9
J2000
13 11 5.5100
+51 00 38.10
J2000
GALAXY
QSO
QUASAR
Brightest GALEX sources within 0.6' radius are:
FUV: quasar target (m=21.6)
NUV: m=21.4
u=20.8,g=19.0,r=17.8,i=17.8,z=17.8,GALEXfuv=21.6
J2000
13 19 14.2000
+52 02 0.00
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radiaus are:
FUV: no detection
NUV: quasar target (m=22.0)
u=23.2,g=20.6,r=20.0,i=19.8,z=20.0,GALEXnuv=22.0
J2000
14 13 59.0000
+06 43 59.50
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' are:
FUV: m=19.9
NUV: m=19.0 (offset from quasar target by 0.56')
u=24.8,g=22.5,r=20.3,i=20.1,z=19.8,GALEXfuv=21.0,nuv=21.4
J2000
15 11 55.3500
+49 57 23.80
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' radius are:
FUV: no detection
NUV: quasar target (m=22.5)
u=24.9,g=23.4,r=20.2,i=18.5,z=18.6,GALEXnuv=22.5
J2000
15 36 50.2500
+50 08 10.30
J2000
GALAXY
QSO
QUASAR
Brightest GALEX (GR2) sources within 0.6' are:
FUV: quasar target (m=21.4)
NUV: quasar target (m=21.3)
u=20.8,g=19.2,r=18.9,i=18.8,z=18.8,GALEXfuv=21.4,nuv=21.3
J2000
22 00 40.9100
+00 08 32.20
J2000
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
ACS/SBC
Spectroscopic
No
No
PR130L
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:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11215
:visit-id "11"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2842
:al-overhead-at-end 0
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3200
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11215
:visit-id "11"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 241
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3200
:pcs-gap 0
)
true
2
0
exposure 5 time can be adjusted
exposure 10 time may be adjusted
/astro/net/sdss/anderson/hst/cyc16/heii/phaseII/OP-cache/11215_sub1-v12.xml
(Tic-Visit
:proposal-id 11215
:visit-id "12"
:proposal-version -1
:trans-version "20070325"
:date "07-May-2007 17:05:05.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "27"
:si-bright-earth-limb-angle 20.0
:data-volume 185136
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11215
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11215
:visit-id "12"
:orbit-number 1
:pcs-time 355
:si-vis-utilization 2772
:al-overhead-at-end 0
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3132
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11215
:visit-id "12"
:orbit-number 2
:pcs-time 355
:si-vis-utilization 2775
:al-overhead-at-end 0
:internal-dur-at-end 241
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3132
:pcs-gap 0
)
true
2
0
exposure 5 time can be adjusted
exposure 10 time may be adjusted