clash: c luster l ensing a nd s upernova survey with h ubble

CLASH: CLASH: CCluster luster LLensing ensing AAnd nd SSupernova survey with upernova survey with HHubbleubble

An HST Multi-Cycle Treasury Program designed to place new constraints on the An HST Multi-Cycle Treasury Program designed to place new constraints on the fundamental components of the cosmos: dark matter, dark energy, and baryons.fundamental components of the cosmos: dark matter, dark energy, and baryons.

Use galaxy clusters as cosmic lenses to reveal dark matter and magnify distant galaxies.Use galaxy clusters as cosmic lenses to reveal dark matter and magnify distant galaxies.WFC3 (UVIS + IR) and ACS will be used to image 25 relaxed clusters in 14 passbands WFC3 (UVIS + IR) and ACS will be used to image 25 relaxed clusters in 14 passbands

from 0.22 - 1.6 microns. Total exposure time per cluster: 20 orbits.from 0.22 - 1.6 microns. Total exposure time per cluster: 20 orbits.

Clusters chosen based on their smooth and symmetric x-ray surface brightness profiles; Clusters chosen based on their smooth and symmetric x-ray surface brightness profiles; simpler lenses to model and minimizes lensing bias. All clusters have T > 5 keV with simpler lenses to model and minimizes lensing bias. All clusters have T > 5 keV with masses ranging from ~5 to ~30 x 10masses ranging from ~5 to ~30 x 101414 M . Redshift range covered: 0.18 < z < 0.90. M . Redshift range covered: 0.18 < z < 0.90.

Multiple epochs enable a z > 1 SN search in the surrounding field (where lensing Multiple epochs enable a z > 1 SN search in the surrounding field (where lensing magnification is low).magnification is low).

Marc Postman (P.I.)

Matthias Bartelmann

Narciso Benitez

Larry Bradley

Tom Broadhurst

Dan Coe

Megan Donahue

Rosa Gonzales-Delgado

Holland Ford

Leopoldo Infante

Daniel Kelson

Ofer Lahav

Dani Maoz

Elinor Medezinski

Leonidas Moustakas

Eniko Regoes

Adam Riess

Piero Rosati

Stella Seitz

Keiichi Umetsu

Arjen van der Wel

Wei Zheng

Adi Zitrin

.

CLASH: CLASH: An HST Multi-Cycle Treasury ProgramAn HST Multi-Cycle Treasury Program

Simulation of dark matter around a forming cluster (Springel et al. 2005)

WHERE R IS THE RESULTING SPATIAL RESOLUTION OF THE

DARK MATTER MAP

R Einstein

NArcs

Deep HST image of massive cluster


Both strong AND weak lensing measurements are needed to make accurate constraints on the DM profile.

CLASH data will allow us to definitively derive the representative equilibrium mass profile shape and robustly measure the cluster DM mass concentrations and their dispersion as a function of cluster mass and their evolution with redshift.


Abell 209 Abell 383 core Abell 611 Abell 963 Abell 2261 CLJ1226+3332

MACS 0329-0211 MACS 0717+3745 MACS 0744+3927 MACS 1115+0129 MACS 1149+2223 MACS 1206-0847

RXJ 0647+7015

Cutouts of Chandra images of 18 of the 25 CLASH clusters from ACCESS databaseCutouts of Chandra images of 18 of the 25 CLASH clusters from ACCESS database

RXJ 1347-1145 RXJ 1423+2404 MS-2137 core RXJ 1702+3536 RXJ 2129+0005


RXJ1347-1145 (z = 0.45) SUPRIME CAM Image ACS/WFC Image

28.5' 3.4'


Why 14 filters? Mag distn of multiply lensed arcs in A1689 and CL0024

With 14 filters, 80% photo-z completeness is reached at AB ~26 mag and useful redshift information is available for ~5 times as many lensed objects than would be possible solely from spectroscopically acquired redshifts.

Will yield photometric

redshifts with rms error of

~2% x (1 + z) for sources

down to ~26 AB mag.


The blue and red solid curves show the expected number of z=8 and z=10 galaxies, respectively, to be discovered behind our 25 clusters as a function of magnitude in the detection band (F110W at z=8 and F140W at z=10).

A significant advantage of searching for high-z objects behind strongly lensing clusters is that the lens model can also be used to discriminate between highly-reddened objects and truly distant, high-z objects as the projected position of the lensed image is a strong function of the source redshift.

The parallel fields of the cluster survey provide the means to find ~10 SNe Ia at z >1 and would double the number of known SNe Ia at z > 1.2 (and potentially more, the precise number depending on the assumed time delay).

CLASH is done


Footprint of our 2 ORIENT survey. ACS FOV in green, WFC3/IR FOV in red, WFC3/UVIS in magenta. The area of the complete 14-band coverage in the cluster center is 4.07 square arcminutes (88% of the WFC3/IR FOV).

~20o

Cluster Pointings

ACS Parallels

WFC3 Parallels

6 arcmin. = 2.2 Mpc @ z=0.5

0

0.5

1

1.5

2

2.5

3

3.5

F2

25

WF

22

5W

F2

75

WF

27

5W

F3

36

WF

33

6W

F3

90

WF

39

0W

F4

75

WF

47

5W

F6

06

W

F7

75

W

F8

14

W

F8

50

LP

F8

50

LP

F1

05

WF

10

5W

F1

10

WF

11

0W

F1

25

WF

12

5W

F1

40

WF

14

0W

F1

60

WF

16

0W

G8

00

L …

as

ne

ed

ed

G

80

0L

… a

s n

ee

de

d

Orb

its p

er fi

lter

per

Clu

ster

Orb

its p

er fi

lter

per

Clu

ster

WFC3-UVIS WFC3-IRACS-WFC

26.4 26.8

26.6 26.9 27.6 27.9 27.1

27.8

26.3

26.8 26.7

26.9 26.1

26.1

Limiting SNR=5 AB magnitudes (for flat spectrum point source) for each passband shown above

CLASH: Top STScI Data/CAL IssuesCLASH: Top STScI Data/CAL Issues

• Need accurate calibration frames (i.e., flats) for Need accurate calibration frames (i.e., flats) for each of our 14 bands that span the 3 detector each of our 14 bands that span the 3 detector systems: WFC3/UVIS, ACS/WFC, WFC3/IRsystems: WFC3/UVIS, ACS/WFC, WFC3/IR

• Need accurate geometric distortion maps in all 14 Need accurate geometric distortion maps in all 14 bands, to allow distortion correction to ~0.1 pixel bands, to allow distortion correction to ~0.1 pixel over the full field of view of each camera. over the full field of view of each camera. Determining the skew terms will, thus, be essential.Determining the skew terms will, thus, be essential.

• Need an efficient way to correct for ACS CTE. I Need an efficient way to correct for ACS CTE. I understand that Jay Anderson has a promising understand that Jay Anderson has a promising algorithm that is currently being evaluated.algorithm that is currently being evaluated.

• Rapid access to data via dedicated disk with fast Rapid access to data via dedicated disk with fast FTP (for SN search).FTP (for SN search).

clash: c luster l ensing a nd s upernova survey with h ubble

Documents