TY - JOUR
T1 - Integrated Sachs-Wolfe measurements with photometric redshift surveys: 2MASS results and future prospects
AU - Francis, Caroline L.
AU - Peacock, John A.
PY - 2010/7/21
Y1 - 2010/7/21
N2 - In a flat universe dominated by dark energy, the integrated Sachs-Wolfe
(ISW) effect can be detected as a large-angle cross-correlation between
the cosmic microwave background and a tracer of large-scale structure.
We investigate whether the inconclusive ISW signal derived from
Two-Micron All-Sky Survey (2MASS) galaxy maps can be improved upon by
including photometric redshifts for the 2MASS galaxies. These redshifts
are derived by matching the 2MASS data with optical catalogues generated
from SuperCOSMOS scans of major photographic sky surveys. We find no
significant ISW signal in this analysis; an ISW effect of the form
expected in a Λ cold dark matter universe is only weakly
preferred over no correlation, with a likelihood ratio of 1.5:1. We
consider ISW detection prospects for future large-scale structure
surveys with fainter magnitude limits and greater survey depth; even
with the best possible data, the ISW cross-correlation signal would be
expected to evade detection in >~10 per cent of cases.
AB - In a flat universe dominated by dark energy, the integrated Sachs-Wolfe
(ISW) effect can be detected as a large-angle cross-correlation between
the cosmic microwave background and a tracer of large-scale structure.
We investigate whether the inconclusive ISW signal derived from
Two-Micron All-Sky Survey (2MASS) galaxy maps can be improved upon by
including photometric redshifts for the 2MASS galaxies. These redshifts
are derived by matching the 2MASS data with optical catalogues generated
from SuperCOSMOS scans of major photographic sky surveys. We find no
significant ISW signal in this analysis; an ISW effect of the form
expected in a Λ cold dark matter universe is only weakly
preferred over no correlation, with a likelihood ratio of 1.5:1. We
consider ISW detection prospects for future large-scale structure
surveys with fainter magnitude limits and greater survey depth; even
with the best possible data, the ISW cross-correlation signal would be
expected to evade detection in >~10 per cent of cases.
UR - http://www.scopus.com/inward/record.url?scp=77955161867&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2010.16278.x
DO - 10.1111/j.1365-2966.2010.16278.x
M3 - Article
VL - 406
SP - 2
EP - 13
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 1
ER -