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Title: MEASURING BULK FLOW OF GALAXY CLUSTERS USING KINEMATIC SUNYAEV-ZELDOVICH EFFECT: PREDICTION FOR PLANCK

Abstract

We predict the performance of the Planck satellite in determining the bulk flow through kinetic Sunyaev-Zeldovich (kSZ) measurements. As velocity tracers, we use ROSAT All-Sky Survey (RASS) clusters as well as expected cluster catalogs from the upcoming missions Planck and eRosita (All-Sky Survey: EASS). We implement a semi-analytical approach to simulate realistic Planck maps as well as Planck and eRosita cluster catalogs. We adopt an unbiased kSZ filter (UF) and matched filter (MF) to maximize the cluster kSZ signal-to-noise ratio. We find that the use of Planck cosmic microwave background maps in conjunction with the currently existing ROSAT cluster sample improves current upper limits on the bulk flow determination by a factor {approx}5 ({approx}10) when using the MF (UF). The accuracy of bulk flow measurement increases with the depth and abundance of the cluster sample: for an input bulk velocity of 500 km s{sup -1}, the UF recovered velocity errors decrease from 94 km s{sup -1} for RASS, to 73 km s{sup -1} for Planck, and to 24 km s{sup -1} for EASS; while the systematic bias decreases from 44% for RASS, 5% for Planck, to 0% for EASS. The 95% upper limit for the recovered bulk flow direction {Delta}{alpha}more » ranges between 4{sup 0} and 60{sup 0} depending on cluster sample and adopted filter. The kSZ dipole determination is mainly limited by the effects of thermal SZ emission in all cases but the one of EASS clusters analyzed with the unbiased filter. This fact makes the UF preferable to the MF when analyzing Planck maps.« less

Authors:
;  [1];  [2]
  1. Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089-0484 (United States)
  2. Kavli Institute for Particle Astrophysics and Cosmology (KIPAC), Stanford University, 382 Via Pueblo, Varian Building, Stanford, CA 94305 (United States)
Publication Date:
OSTI Identifier:
21578253
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 736; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/736/2/116; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; GALAXY CLUSTERS; MAPS; RELICT RADIATION; SATELLITES; VELOCITY; DOCUMENT TYPES; ELECTROMAGNETIC RADIATION; MICROWAVE RADIATION; RADIATIONS

Citation Formats

Mak, D. S. Y., Pierpaoli, E., and Osborne, S. J. MEASURING BULK FLOW OF GALAXY CLUSTERS USING KINEMATIC SUNYAEV-ZELDOVICH EFFECT: PREDICTION FOR PLANCK. United States: N. p., 2011. Web. doi:10.1088/0004-637X/736/2/116.
Mak, D. S. Y., Pierpaoli, E., & Osborne, S. J. MEASURING BULK FLOW OF GALAXY CLUSTERS USING KINEMATIC SUNYAEV-ZELDOVICH EFFECT: PREDICTION FOR PLANCK. United States. doi:10.1088/0004-637X/736/2/116.
Mak, D. S. Y., Pierpaoli, E., and Osborne, S. J. Mon . "MEASURING BULK FLOW OF GALAXY CLUSTERS USING KINEMATIC SUNYAEV-ZELDOVICH EFFECT: PREDICTION FOR PLANCK". United States. doi:10.1088/0004-637X/736/2/116.
@article{osti_21578253,
title = {MEASURING BULK FLOW OF GALAXY CLUSTERS USING KINEMATIC SUNYAEV-ZELDOVICH EFFECT: PREDICTION FOR PLANCK},
author = {Mak, D. S. Y. and Pierpaoli, E. and Osborne, S. J.},
abstractNote = {We predict the performance of the Planck satellite in determining the bulk flow through kinetic Sunyaev-Zeldovich (kSZ) measurements. As velocity tracers, we use ROSAT All-Sky Survey (RASS) clusters as well as expected cluster catalogs from the upcoming missions Planck and eRosita (All-Sky Survey: EASS). We implement a semi-analytical approach to simulate realistic Planck maps as well as Planck and eRosita cluster catalogs. We adopt an unbiased kSZ filter (UF) and matched filter (MF) to maximize the cluster kSZ signal-to-noise ratio. We find that the use of Planck cosmic microwave background maps in conjunction with the currently existing ROSAT cluster sample improves current upper limits on the bulk flow determination by a factor {approx}5 ({approx}10) when using the MF (UF). The accuracy of bulk flow measurement increases with the depth and abundance of the cluster sample: for an input bulk velocity of 500 km s{sup -1}, the UF recovered velocity errors decrease from 94 km s{sup -1} for RASS, to 73 km s{sup -1} for Planck, and to 24 km s{sup -1} for EASS; while the systematic bias decreases from 44% for RASS, 5% for Planck, to 0% for EASS. The 95% upper limit for the recovered bulk flow direction {Delta}{alpha} ranges between 4{sup 0} and 60{sup 0} depending on cluster sample and adopted filter. The kSZ dipole determination is mainly limited by the effects of thermal SZ emission in all cases but the one of EASS clusters analyzed with the unbiased filter. This fact makes the UF preferable to the MF when analyzing Planck maps.},
doi = {10.1088/0004-637X/736/2/116},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 736,
place = {United States},
year = {2011},
month = {8}
}