Lensing analysis of the CLASH cluster sample
A. Donnarumma, INAF-OABo Project Coordinator: Dr. M. Meneghetti, INAF-OABo Collaborators at OABo/UNIBO: C. Giocoli, F. Bellagamba, M. Boldrin, S.Ettori Palermo, ADAE - 20/10/2011
A.Donnarumma
Introduction | Lensing analysis of CLASH
The CLASH survey - Overview The Cluster Lensing And Supernova survey with Hubble PI: Marc Postman (STSI), Holland Ford (JHU) ● Awarded 524 orbits on HST Multi-Cycle Treasury program >> all CLASH data are immediately released for public access ● Observations of 25 massive galaxy clusters with WFC3 and ACS in 16 filters over a 3 year period, started in Nov. 2010 ● 474 orbits over 524 for cluster imaging and simultaneously for the parallel SN search program Characteristics of the cluster sample: → wide redshift range, 0.15 < z < 0.9 (median of z ~ 0.4) → spans almost an order of magnitude in mass → X-ray temperature TX > 5 keV Complementary data that will be obtained within CLASH: ● SPITZER observations: ICLASH program (PI: R. Bouwens) ● 225 hours of time with VLT/VIMOS (PI: P. Rosati) + additional archival data (optical/SUBARU, X-ray/ Chandra...)
Palermo, ADAE - 20/10/2011
Abell 383 - Credit: Dan Coe
A.Donnarumma
Introduction | Lensing analysis of CLASH
The CLASH survey - Overview The Cluster Lensing And Supernova survey with Hubble PI: Marc Postman (STSI), Holland Ford (JHU) ● Awarded 524 orbits on HST Multi-Cycle Treasury program >> all CLASH data are immediately released for public access ● Observations of 25 massive galaxy clusters with WFC3 and ACS in 16 filters over a 3 year period, started in Nov. 2010 ● 474 orbits over 524 for cluster imaging and simultaneously for the parallel SN search program Characteristics of the cluster sample: → wide redshift range, 0.15 < z < 0.9 (median of z ~ 0.4) → spans almost an order of magnitude in mass → X-ray temperature TX > 5 keV Complementary data that will be obtained within CLASH: ● SPITZER observations: ICLASH program (PI: R. Bouwens) ● 225 hours of time with VLT/VIMOS (PI: P. Rosati) Abell selected 383 - Credit: Dan Coeeach subsample; + additional archival data (optical/SUBARU, X-ray/ Chandra X-ray images of the 20 CLASH clusters in the X-ray image size is 3.45 ‘. Credits: ACCEPT, Postman+2011 Chandra...)
Palermo, ADAE - 20/10/2011
A.Donnarumma
Introduction | Lensing analysis of CLASH
The CLASH survey - Overview Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing - verify consistency of cluster/mass analysis methods - test the concentration-mass relation and the DM inner density profile in galaxy clusters, and verify if they are incosistent with numerical predictions, as often claimed (Coe+2010, Broadhurst+2008, Newman+2010,Sand+2008)
Broadhurst+2008
Palermo, ADAE - 20/10/2011
Newman+2010
A.Donnarumma
Introduction | Lensing analysis of CLASH
The CLASH survey - Overview Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing - verify consistency of cluster/mass analysis methods - test the concentration-mass relation and the DM inner density profile in galaxy clusters, and verify if they are incosistent with numerical predictions, as often claimed (Coe+2010, Broadhurst+2008, Newman+2010,Sand+2008)
• Detect and characterize high-redshift galaxies at z > 7 - find the first generation of galaxies and understand their role in the reionization process at 6 ~< z > light is deflected when propagates through an inhomogeneous gravitational field ● The light deflection angle is linearly dependent on the projected mass density
Strong Lensing ➞ accurate masses of the lens core: N conjugated multiple images Solve for the source position and for the lens potential
Weak Lensing ➞ accurate masses of the lens outskirts Statistical analysis of the distortion induced in the shape of background galaxies
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for galaxy cluster cores | Lensing analysis of CLASH
CLASH science goals Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing Combination of SL+WL lensing >> necessary to overcome the possible systematic biases in the lensing analysis (Meneghetti+2011,2010,Donnarumma+2009,2011)
Meneghetti+2011
Palermo, ADAE - 20/10/2011
Meneghetti+2011
A.Donnarumma
CLASH for galaxy cluster cores | Lensing analysis of CLASH
CLASH science goals Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing Combination of SL+WL lensing >> necessary to overcome the possible systematic biases in the lensing analysis (Meneghetti+2011,2010,Donnarumma+2009,2011)
Meneghetti+2011
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for galaxy cluster cores | Lensing analysis of CLASH
CLASH science goals Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing → 16 filters >> photometric redshifts for most of the lensed images (typical magnitude 25 < I < 28) → Sample size allows measurements of the average of cluster concentrations with a ~10% accuracy: verify claims of cluster concentrations higher than numerical predictions
→ Optimal cluster sample/datasets to be compared with numerical results (see Meneghetti+2010,2008)
Postman+2011
Palermo, ADAE - 20/10/2011
A.Donnarumma
Lensing results | Lensing analysis of CLASH
First results of the CLASH program Primary science goals: • Map the distribution of dark matter in galaxy clusters using strong and weak gravitational lensing
First CLASH composite colour images
(A) Abell 383 (B) MACS1149+2223 (C) Abell 2261 (D) MACS1206-0847
Palermo, ADAE - 20/10/2011
A.Donnarumma
Lensing results | Lensing analysis of CLASH
First results of the CLASH program Strong lensing first results: Abell 383 ● SL reconstruction of Abell 383 (z= 0.189) through 27 lensed images, 13 of which were newly identified thanks to the new CLASH data - corresponding to 4 sources ● A z~6.03 galaxy identified in the cluster core (see later) ● Inner total density profile compatible with NFW expectations ● Concentration higher of predictions from simulations
Zitrin+2011b Mvir =9.46 x 1014 M_sun c = 8.22 +/-0.44 α = 1.045 +/-0.05
Palermo, ADAE - 20/10/2011
A.Donnarumma
Lensing results | Lensing analysis of CLASH
First results of the CLASH program Strong lensing first results: Abell 383 ● SL reconstruction of Abell 383 (z= 0.189) through 27 lensed images, 13 of which were newly identified thanks to the new CLASH data - corresponding to 4 sources ● A z~6.03 galaxy identified in the cluster core (see later) ● Inner total density profile compatible with NFW expectations ● Concentration higher of predictions from simulations
Zitrin+2011b Mvir =9.46 x 1014 M_sun c = 8.22 +/-0.44 α = 1.045 +/-0.05
Palermo, ADAE - 20/10/2011
A.Donnarumma
Lensing results | Lensing analysis of CLASH
First results of the CLASH program Strong lensing first results: MS 1358.4+6245 ● SL analysis of MS 1358.4+6245 (z=0.33): identification of 19 new multiply-lensed images - total of 23 SL images
● Relatively shallow inner mass profile
Images of source 1 at z=4.92
Reconstructed source: dwarf-sized galaxy of radius ' ~ 1 kpc
Zitrin+2011a: core of MS 1358.4+6245 (critical lines for z_s = 4.92, 2)
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for high-z objects | Lensing analysis of CLASH
CLASH science goals Primary science goals: • Detect and characterize some of the most distant galaxies discovered at z > 7 Massive lenses as powerful gravitational telescopes: • Gravitational lensing (de)magnifies background sources > high SNR detections of more, faint high-z objects → most faint (AB < 26.5) high-z galaxy candidates have been found in cluster fields (Zheng et al. 2009, Bradley+2011, Richard+2011)
First detections of high-z objects: • double images of a z~6 galaxy identified in the core of Abell 383 thanks to the new CLASH data (Richard+2011), confirmed with Keck spectroscopy • Unlensed MH=27.2 ± 0.05, magnification factor = 11.4 ± 1.9 (2.65 ± 0.17 mag)
Richard+2011
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for high-z objects | Lensing analysis of CLASH
CLASH science goals Primary science goals: • Detect and characterize some of the most distant galaxies discovered at z > 7 Massive lenses as powerful gravitational telescopes: • Gravitational lensing (de)magnifies background sources > high SNR detections of more, faint high-z objects → most faint (AB < 26.5) high-z galaxy candidates have been found in cluster fields (Zheng et al. 2009, Bradley+2011, Richard+2011)
First detections of high-z objects: • double images of a z~6 galaxy identified in the core of Abell 383 thanks to the new CLASH data (Richard+2011), confirmed with Keck spectroscopy • Unlensed MH=27.2 ± 0.05, magnification factor = 11.4 ± 1.9 (2.65 ± 0.17 mag) → CLASH 16 filters set allows to solve common photo-z degeneracies and to trace Lyα up to z ~10 Robust distinction between high-z objects and lower redshift reddened galaxies
Postman+2011 Richard+2011
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for SN Ia | Lensing analysis of CLASH
CLASH The CLASH science survey goals Primary science goals: • Detect Type Ia supernovae out to redshift z ~ 2.5 Observations performed in parallel fields → ACS parallels taken in F775W and F850LP → WFC3 parallels taken in F350LP (UVIS), F125W (IR) and F160W (IR) → cadence between epochs: ~ 10 – 14 days >> at each orient the total duration of the SN search is ~ 30 – 45 days
ACS FOV shown in yellow, WFC3/UVIS in blue, and WFC3/IR in red. Credits: CLASH website
Palermo, ADAE - 20/10/2011
A.Donnarumma
CLASH for SN Ia | Lensing analysis of CLASH
CLASH The CLASH science survey goals Primary science goals: • Detect Type Ia supernovae out to redshift z ~ 2.5 First results: 5 SN detected so far Complete list @ www.skyalert.org
Riess et al, in prep
Palermo, ADAE - 20/10/2011
A.Donnarumma
Summary | Lensing analysis of CLASH
The CLASH survey - Summary ➟ Current preliminary results: • indications that the DM inner slope is consistent with numerical predictions • measured concentrations are higher than predicted • 5 SN detected so far - more expected!
➟ Definitive results will be obtained after the observation cycle is completed: • precise photometric redshifts for galaxies having MF775W < 26, including hundreds of strongly lensed objects • tightly constrained cluster mass profiles over a large range of scales, thanks to the inclusion of WL constraints • constraints on the baryonic gas distribution from mm- and X-ray- imaging • robust measurements of their central density concentrations •detection of dozens relatively bright (m < 26 AB) galaxies at high-z (z > 7) • detections of dozens of z > 1 Type Ia supernovae that, combined with SNe Ia detected by the CANDELS program, will provide new constraints on cosmology
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Significant results were already obtained... Palermo, ADAE - 20/10/2011
The best is yet to come! A.Donnarumma
Summary | Lensing analysis of CLASH
The CLASH survey - Summary
Thank you!
Palermo, ADAE - 20/10/2011
A.Donnarumma
