TY - JOUR
T1 - Lensing is low: cosmology, galaxy formation or new physics?
AU - Leauthaud, Alexie
AU - Saito, Shun
AU - Hilbert, Stefan
AU - Barreira, Alexandre
AU - More, Surhud
AU - White, Martin
AU - Alam, Shadab
AU - Behroozi, Peter
AU - Bundy, Kevin
AU - Coupon, Jean
AU - Erben, Thomas
AU - Heymans, Catherine
AU - Hildebrandt, Hendrik
AU - Mandelbaum, Rachel
AU - Miller, Lance
AU - Moraes, Bruno
AU - Pereira, Maria E. S.
AU - Rodríguez-Torres, Sergio A.
AU - Schmidt, Fabian
AU - Shan, Huan-Yuan
AU - Viel, Matteo
AU - Villaescusa-Navarro, Francisco
N1 - Near final version deposited to arXiv 25.11.16 before publication date. See REF guidance, paragraph 238.
PY - 2017/2/3
Y1 - 2017/2/3
N2 - We present high signal-to-noise galaxy-galaxy lensing measurements of
the Baryon Oscillation Spectroscopic Survey constant mass (CMASS) sample
using 250 deg2 of weak-lensing data from Canada-France-Hawaii
Telescope Lensing Survey and Canada-France-Hawaii Telescope Stripe 82
Survey. We compare this signal with predictions from mock catalogues
trained to match observables including the stellar mass function and the
projected and two-dimensional clustering of CMASS. We show that the
clustering of CMASS, together with standard models of the galaxy-halo
connection, robustly predicts a lensing signal that is 20-40 per cent
larger than observed. Detailed tests show that our results are robust to
a variety of systematic effects. Lowering the value of S_8=σ _8
\sqrt{Ω _m/0.3} compared to Planck Collaboration XIII reconciles
the lensing with clustering. However, given the scale of our measurement
(r <10 h-1 Mpc), other effects may also be at play and
need to be taken into consideration. We explore the impact of baryon
physics, assembly bias, massive neutrinos and modifications to general
relativity on ΔΣ and show that several of these effects may
be non-negligible given the precision of our measurement. Disentangling
cosmological effects from the details of the galaxy-halo connection, the
effect of baryons, and massive neutrinos, is the next challenge facing
joint lensing and clustering analyses. This is especially true in the
context of large galaxy samples from Baryon Acoustic Oscillation surveys
with precise measurements but complex selection functions.
AB - We present high signal-to-noise galaxy-galaxy lensing measurements of
the Baryon Oscillation Spectroscopic Survey constant mass (CMASS) sample
using 250 deg2 of weak-lensing data from Canada-France-Hawaii
Telescope Lensing Survey and Canada-France-Hawaii Telescope Stripe 82
Survey. We compare this signal with predictions from mock catalogues
trained to match observables including the stellar mass function and the
projected and two-dimensional clustering of CMASS. We show that the
clustering of CMASS, together with standard models of the galaxy-halo
connection, robustly predicts a lensing signal that is 20-40 per cent
larger than observed. Detailed tests show that our results are robust to
a variety of systematic effects. Lowering the value of S_8=σ _8
\sqrt{Ω _m/0.3} compared to Planck Collaboration XIII reconciles
the lensing with clustering. However, given the scale of our measurement
(r <10 h-1 Mpc), other effects may also be at play and
need to be taken into consideration. We explore the impact of baryon
physics, assembly bias, massive neutrinos and modifications to general
relativity on ΔΣ and show that several of these effects may
be non-negligible given the precision of our measurement. Disentangling
cosmological effects from the details of the galaxy-halo connection, the
effect of baryons, and massive neutrinos, is the next challenge facing
joint lensing and clustering analyses. This is especially true in the
context of large galaxy samples from Baryon Acoustic Oscillation surveys
with precise measurements but complex selection functions.
KW - gravitational lensing: weak
KW - cosmology: observations
KW - large-scale structure of Universe
U2 - 10.1093/mnras/stx258
DO - 10.1093/mnras/stx258
M3 - Article
VL - 467
SP - 3024
EP - 3047
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -