Are Low-Luminosity Galaxies Responsible for Cosmic Reionization?
Our group has demonstrated that massive clusters, acting as powerful cosmic lenses, can constrain the abundance and properties of low-luminosity star-forming sources beyond z~6; such sources are thought to be responsible for ending cosmic reionization. The large magnification possible in the critical regions of well-constrained clusters brings sources into view that lie at or beyond the limits of conventional exposures such as the UDF. We have shown that the combination of HST and Spitzer is particularly effective in delivering the physical properties of these distant sources, constraining their mass, age and past star formation history. Indirectly, we therefore gain a valuable glimpse to yet earlier epochs. Recognizing the result (and limitations) of blank field surveys, we propose a systematic search through 10 lensing clusters with ACS/F814W and WFC3/[F110W+F160W] (in conjunction with existing deep IRAC data). Our goal is to measure with great accuracy the luminosity function at z~7 over a range of at least 3 magnitude, based on the identification of about 50 lensed galaxies at 6.5<z<8. Our survey will mitigate cosmic variance and extend the search both to lower luminosities and, by virtue of the WFC3/IRAC combination, to higher redshift. Thanks to the lensing amplification spectroscopic follow-up will be possible and make our findings the most robust prior to the era of JWST and the ELTs.
We are conducting here, an imaging survey (in F814W, F110W and F160W) of 10 massive clusters known to be very efficient gravitational lenses.
To maximize depth, we will used either LOW-SKY (for 8 out of 10 clusters) or CVZ (for A2218 and MS1358).
In general, we will do 4 orbits in F814W, and 1 orbit for each F110W and F160W. However because some clusters have already been observed in the I-band with ACS, we will observe those cluster with only 1, 2 or 3 orbits.
To maximize the image quality (allowing to remove cosmic rays and detectors defects), we will use dither patterns both fo ACS and WFC3/IR. For each filter observation a minimum of 4 up to 8 images will be taken.
None
None
None
COSMOLOGY
12
false
0.0
0.0
false
false
false
false
false
SUPPORTED
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
00 37 6.0000
+09 09 40.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
00 37 6.0000
+09 09 40.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
02 39 53.0000
-01 34 40.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
02 39 53.0000
-01 34 40.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
09 17 58.0000
+51 43 50.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
14 01 1.8000
+02 52 20.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
14 01 1.8000
+02 52 20.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
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J2000
22 58 48.5000
-34 48 8.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
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J2000
13 47 30.5000
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J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
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J2000
13 47 30.5000
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J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
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J2000
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-55 56 58.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
16 35 49.4000
+66 12 43.00
J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
13 59 50.0000
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J2000
CLUSTER OF GALAXIES
GRAVITATIONAL LENS
RICH CLUSTER
This object was generated by the targetselector and retrieved from the SIMBAD database.
J2000
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J2000
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F160W
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No
F814W
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No
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Imaging
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No
F160W
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No
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Imaging
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No
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WFC3/IR
Imaging
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No
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ACS/WFC
Imaging
No
No
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Imaging
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No
F110W
WFC3/IR
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No
No
F160W
ACS/WFC
Imaging
No
No
F814W
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Imaging
No
No
F110W
WFC3/IR
Imaging
No
No
F160W
ACS/WFC
Imaging
No
No
F814W
WFC3/IR
Imaging
No
No
F110W
WFC3/IR
Imaging
No
No
F160W
ACS/WFC
Imaging
No
No
F814W
WFC3/IR
Imaging
No
No
F110W
WFC3/IR
Imaging
No
No
F160W
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Imaging
No
No
F814W
WFC3/IR
Imaging
No
No
F110W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
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WFC3/IR
Imaging
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No
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ACS/WFC
Imaging
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No
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WFC3/IR
Imaging
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No
F110W
WFC3/IR
Imaging
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No
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(Tic-Orbit
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:max-dark-utilization 1920
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true
4
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
4 orbits in 814w on a370
(Tic-Visit
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true
4
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
2 orbits in 814w on the bullet cluster
(Tic-Visit
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:pcs-visibility 3050
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(Tic-Orbit
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true
2
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
1 orbit in 814w on rxj1347
(Tic-Visit
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(Tic-Orbit
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:al-overhead-at-end 0
:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "Y"
:pcs-visibility 3178
:pcs-gap 400
)
true
1
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
1 orbit in 814w on ms1358 - CVZ
(Tic-Visit
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(Tic-Orbit
:cvz T
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:internal-dur-at-end 349
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 0
:low-sky "N"
:pcs-visibility 0
:pcs-gap 0
)
true
1
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
4 orbits 814w ACS on a773
(Tic-Visit
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)
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true
4
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
3 orbits 814w ACS on 1077
(Tic-Visit
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:pcs-visibility 3191
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)
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)
true
3
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
3 orbits 814w ACS on a1835
We implemented a loose ORIENT constraint to remove contamination by 3 bright stars (V~12.5). We verified that such constraint was not impacting much the schedulability of the observation.
(Tic-Visit
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true
3
0
The scheduling data was generated by CASM 17.2.
CASM was run in Phase II mode.
3 orbits 814w ACS on ms0451
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:pcs-gap 404
)
(Tic-Orbit
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)
true
3
0