6 research outputs found
The Atacama Cosmology Telescope: A Catalog of >4000 SunyaevâZelâdovich Galaxy Clusters
We present a catalog of 4195 optically confirmed SunyaevâZel'dovich (SZ) selected galaxy clusters detected with signal-to-noise ratio >4 in 13,211 deg2 of sky surveyed by the Atacama Cosmology Telescope (ACT). Cluster candidates were selected by applying a multifrequency matched filter to 98 and 150 GHz maps constructed from ACT observations obtained from 2008 to 2018 and confirmed using deep, wide-area optical surveys. The clusters span the redshift range 0.04 1 clusters, and a total of 868 systems are new discoveries. Assuming an SZ signal versus mass-scaling relation calibrated from X-ray observations, the sample has a 90% completeness mass limit of M500c > 3.8 Ă 1014 Mâ, evaluated at z = 0.5, for clusters detected at signal-to-noise ratio >5 in maps filtered at an angular scale of 2farcm4. The survey has a large overlap with deep optical weak-lensing surveys that are being used to calibrate the SZ signal mass-scaling relation, such as the Dark Energy Survey (4566 deg2), the Hyper Suprime-Cam Subaru Strategic Program (469 deg2), and the Kilo Degree Survey (825 deg2). We highlight some noteworthy objects in the sample, including potentially projected systems, clusters with strong lensing features, clusters with active central galaxies or star formation, and systems of multiple clusters that may be physically associated. The cluster catalog will be a useful resource for future cosmological analyses and studying the evolution of the intracluster medium and galaxies in massive clusters over the past 10 Gyr
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The Dark Energy Survey Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5000 Square Degree Footprint
Abstract
We report the combined results of eight searches for strong gravitational lens systems in the full 5000 square degrees of Dark Energy Survey (DES) observations. The observations accumulated by the end of the third observing season fully covered the DES footprint in five filters (grizY), with an i-band limiting magnitude (at 10Ï) of 23.44. In four searches, a list of potential candidates was identified using a color and magnitude selection from the object catalogs created from the first three observing seasons. Three other searches were conducted at the locations of previously identified galaxy clusters. Cutout images of potential candidates were then visually scanned using an object viewer. An additional set of candidates came from a data-quality check of a subset of the colorâcoadd tiles created from the full DES six-season data set. A short list of the most promising strong-lens candidates was then numerically ranked according to whether or not we judged them to be bona fide strong gravitational lens systems. These searches discovered a diverse set of 247 strong-lens candidate systems, of which 81 are identified for the first time. We provide the coordinates, magnitudes, and photometric properties of the lens and source objects, and an estimate of the Einstein radius for 81 new systems and 166 previously reported systems. This catalog will be of use for selecting interesting systems for detailed follow up, studies of galaxy cluster and group mass profiles, as well as a training/validation set for automated strong-lens searches.</jats:p
The Dark Energy Survey Bright Arcs Survey: Candidate Strongly Lensed Galaxy Systems from the Dark Energy Survey 5000 Square Degree Footprint
Abstract
We report the combined results of eight searches for strong gravitational lens systems in the full 5000 square degrees of Dark Energy Survey (DES) observations. The observations accumulated by the end of the third observing season fully covered the DES footprint in five filters (grizY), with an i-band limiting magnitude (at 10Ï) of 23.44. In four searches, a list of potential candidates was identified using a color and magnitude selection from the object catalogs created from the first three observing seasons. Three other searches were conducted at the locations of previously identified galaxy clusters. Cutout images of potential candidates were then visually scanned using an object viewer. An additional set of candidates came from a data-quality check of a subset of the colorâcoadd tiles created from the full DES six-season data set. A short list of the most promising strong-lens candidates was then numerically ranked according to whether or not we judged them to be bona fide strong gravitational lens systems. These searches discovered a diverse set of 247 strong-lens candidate systems, of which 81 are identified for the first time. We provide the coordinates, magnitudes, and photometric properties of the lens and source objects, and an estimate of the Einstein radius for 81 new systems and 166 previously reported systems. This catalog will be of use for selecting interesting systems for detailed follow up, studies of galaxy cluster and group mass profiles, as well as a training/validation set for automated strong-lens searches.</jats:p
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The atacama cosmology telescope: A catalog of >4000 SunyaevâZelâdovich galaxy clusters
We present a catalog of 4195 optically confirmed Sunyaev-Zel'dovich (SZ)
selected galaxy clusters detected with signal-to-noise > 4 in 13,211 deg of
sky surveyed by the Atacama Cosmology Telescope (ACT). Cluster candidates were
selected by applying a multi-frequency matched filter to 98 and 150 GHz maps
constructed from ACT observations obtained from 2008-2018, and confirmed using
deep, wide-area optical surveys. The clusters span the redshift range 0.04 < z
1 clusters, and a total
of 868 systems are new discoveries. Assuming an SZ-signal vs. mass scaling
relation calibrated from X-ray observations, the sample has a 90% completeness
mass limit of M500c > 3.8 x 10 MSun, evaluated at z = 0.5, for clusters
detected at signal-to-noise ratio > 5 in maps filtered at an angular scale of
2.4'. The survey has a large overlap with deep optical weak-lensing surveys
that are being used to calibrate the SZ-signal mass-scaling relation, such as
the Dark Energy Survey (4566 deg), the Hyper Suprime-Cam Subaru Strategic
Program (469 deg), and the Kilo Degree Survey (825 deg). We highlight
some noteworthy objects in the sample, including potentially projected systems;
clusters with strong lensing features; clusters with active central galaxies or
star formation; and systems of multiple clusters that may be physically
associated. The cluster catalog will be a useful resource for future
cosmological analyses, and studying the evolution of the intracluster medium
and galaxies in massive clusters over the past 10 Gyr
Recommended from our members
The Atacama Cosmology Telescope: A Catalog of >4000 SunyaevâZelâdovich Galaxy Clusters
We present a catalog of 4195 optically confirmed Sunyaev-Zelâdovich (SZ) selected galaxy clusters
detected with signal-to-noise > 4 in 13,211 deg2 of sky surveyed by the Atacama Cosmology Tele-
scope (ACT). Cluster candidates were selected by applying a multi-frequency matched filter to 98
and 150 GHz maps constructed from ACT observations obtained from 2008â2018, and confirmed us-
ing deep, wide-area optical surveys. The clusters span the redshift range 0.04 < z < 1.91 (median
z = 0.52). The catalog contains 222 z > 1 clusters, and a total of 868 systems are new discoveries.
Assuming an SZ-signal vs. mass scaling relation calibrated from X-ray observations, the sample has a
90% completeness mass limit of M500c > 3.8 Ă 1014 M , evaluated at z = 0.5, for clusters detected at
signal-to-noise ratio > 5 in maps filtered at an angular scale of 2.4âČ. The survey has a large overlap with
deep optical weak-lensing surveys that are being used to calibrate the SZ-signal mass-scaling relation,
such as the Dark Energy Survey (4566 deg2), the Hyper Suprime-Cam Subaru Strategic Program (469
deg2), and the Kilo Degree Survey (825 deg2). We highlight some noteworthy objects in the sample,
including potentially projected systems; clusters with strong lensing features; clusters with active cen-
tral galaxies or star formation; and systems of multiple clusters that may be physically associated. The
cluster catalog will be a useful resource for future cosmological analyses, and studying the evolution
of the intracluster medium and galaxies in massive clusters over the past 10 Gyr