Abstract
Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we use a sample of 206 X-ray-selected galaxy groups to investigate the scaling relation between X-ray luminosity (L X) and halo mass (M 200) where M 200 is derived via stacked weak gravitational lensing. This work draws upon a broad array of multi-wavelength COSMOS observations including 1.64 degrees2 of contiguous imaging with the Advanced Camera for Surveys to a limiting magnitude of I F814W = 26.5 and deep XMM-Newton/Chandra imaging to a limiting flux of 1.0 × 10-15 erg cm-2 s-1 in the 0.5-2 keV band. The combined depth of these two data sets allows us to probe the lensing signals of X-ray-detected structures at both higher redshifts and lower masses than previously explored. Weak lensing profiles and halo masses are derived for nine sub-samples, narrowly binned in luminosity and redshift. The COSMOS data alone are well fit by a power law, M 200 (L X)α, with a slope of α = 0.66 ± 0.14. These results significantly extend the dynamic range for which the halo masses of X-ray-selected structures have been measured with weak gravitational lensing. As a result, tight constraints are obtained for the slope of the M-L X relation. The combination of our group data with previously published cluster data demonstrates that the M-L X relation is well described by a single power law, α = 0.64 ± 0.03, over two decades in mass, M 200 ∼ 1013.5-1015.5 h -1 72 M ⊙. These results are inconsistent at the 3.7σ level with the self-similar prediction of α = 0.75. We examine the redshift dependence of the M-L X relation and find little evidence for evolution beyond the rate predicted by self-similarity from z ∼0.25 to z ∼0.8.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 97-114 |
| Number of pages | 18 |
| Journal | Astrophysical Journal |
| Volume | 709 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 1 2010 |
| Externally published | Yes |
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Keywords
- Cosmology: observations
- Gravitational lensing
- Large-scale structure of universe
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
Cite this
A weak lensing study of x-ray groups in the cosmos survey : Form and evolution of the mass-luminosity relation. / Leauthaud, Alexie; Finoguenov, Alexis; Kneib, Jean Paul; Taylor, James E.; Massey, Richard; Rhodes, Jason; Ilbert, Olivier; Bundy, Kevin; Tinker, Jeremy; George, Matthew R.; Capak, Peter; Koekemoer, Anton M.; Johnston, David E.; Zhang, Yu Ying; Cappelluti, Nico; Ellis, Richard S.; Elvis, Martin; Giodini, Stefania; Heymans, Catherine; Le Fèvre, Oliver; Lilly, Simon; McCracken, Henry J.; Mellier, Yannick; Réfrégier, Alexandre; Salvato, Mara; Scoville, Nick; Smoot, George; Tanaka, Masayuki; Van Waerbeke, Ludovic; Wolk, Melody.
In: Astrophysical Journal, Vol. 709, No. 1, 01.01.2010, p. 97-114.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A weak lensing study of x-ray groups in the cosmos survey
T2 - Form and evolution of the mass-luminosity relation
AU - Leauthaud, Alexie
AU - Finoguenov, Alexis
AU - Kneib, Jean Paul
AU - Taylor, James E.
AU - Massey, Richard
AU - Rhodes, Jason
AU - Ilbert, Olivier
AU - Bundy, Kevin
AU - Tinker, Jeremy
AU - George, Matthew R.
AU - Capak, Peter
AU - Koekemoer, Anton M.
AU - Johnston, David E.
AU - Zhang, Yu Ying
AU - Cappelluti, Nico
AU - Ellis, Richard S.
AU - Elvis, Martin
AU - Giodini, Stefania
AU - Heymans, Catherine
AU - Le Fèvre, Oliver
AU - Lilly, Simon
AU - McCracken, Henry J.
AU - Mellier, Yannick
AU - Réfrégier, Alexandre
AU - Salvato, Mara
AU - Scoville, Nick
AU - Smoot, George
AU - Tanaka, Masayuki
AU - Van Waerbeke, Ludovic
AU - Wolk, Melody
PY - 2010/1/1
Y1 - 2010/1/1
N2 - Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we use a sample of 206 X-ray-selected galaxy groups to investigate the scaling relation between X-ray luminosity (L X) and halo mass (M 200) where M 200 is derived via stacked weak gravitational lensing. This work draws upon a broad array of multi-wavelength COSMOS observations including 1.64 degrees2 of contiguous imaging with the Advanced Camera for Surveys to a limiting magnitude of I F814W = 26.5 and deep XMM-Newton/Chandra imaging to a limiting flux of 1.0 × 10-15 erg cm-2 s-1 in the 0.5-2 keV band. The combined depth of these two data sets allows us to probe the lensing signals of X-ray-detected structures at both higher redshifts and lower masses than previously explored. Weak lensing profiles and halo masses are derived for nine sub-samples, narrowly binned in luminosity and redshift. The COSMOS data alone are well fit by a power law, M 200 (L X)α, with a slope of α = 0.66 ± 0.14. These results significantly extend the dynamic range for which the halo masses of X-ray-selected structures have been measured with weak gravitational lensing. As a result, tight constraints are obtained for the slope of the M-L X relation. The combination of our group data with previously published cluster data demonstrates that the M-L X relation is well described by a single power law, α = 0.64 ± 0.03, over two decades in mass, M 200 ∼ 1013.5-1015.5 h -1 72 M ⊙. These results are inconsistent at the 3.7σ level with the self-similar prediction of α = 0.75. We examine the redshift dependence of the M-L X relation and find little evidence for evolution beyond the rate predicted by self-similarity from z ∼0.25 to z ∼0.8.
AB - Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we use a sample of 206 X-ray-selected galaxy groups to investigate the scaling relation between X-ray luminosity (L X) and halo mass (M 200) where M 200 is derived via stacked weak gravitational lensing. This work draws upon a broad array of multi-wavelength COSMOS observations including 1.64 degrees2 of contiguous imaging with the Advanced Camera for Surveys to a limiting magnitude of I F814W = 26.5 and deep XMM-Newton/Chandra imaging to a limiting flux of 1.0 × 10-15 erg cm-2 s-1 in the 0.5-2 keV band. The combined depth of these two data sets allows us to probe the lensing signals of X-ray-detected structures at both higher redshifts and lower masses than previously explored. Weak lensing profiles and halo masses are derived for nine sub-samples, narrowly binned in luminosity and redshift. The COSMOS data alone are well fit by a power law, M 200 (L X)α, with a slope of α = 0.66 ± 0.14. These results significantly extend the dynamic range for which the halo masses of X-ray-selected structures have been measured with weak gravitational lensing. As a result, tight constraints are obtained for the slope of the M-L X relation. The combination of our group data with previously published cluster data demonstrates that the M-L X relation is well described by a single power law, α = 0.64 ± 0.03, over two decades in mass, M 200 ∼ 1013.5-1015.5 h -1 72 M ⊙. These results are inconsistent at the 3.7σ level with the self-similar prediction of α = 0.75. We examine the redshift dependence of the M-L X relation and find little evidence for evolution beyond the rate predicted by self-similarity from z ∼0.25 to z ∼0.8.
KW - Cosmology: observations
KW - Gravitational lensing
KW - Large-scale structure of universe
UR - http://www.scopus.com/inward/record.url?scp=73849101698&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=73849101698&partnerID=8YFLogxK
U2 - 10.1088/0004-637X/709/1/97
DO - 10.1088/0004-637X/709/1/97
M3 - Article
AN - SCOPUS:73849101698
VL - 709
SP - 97
EP - 114
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
ER -