Browsing by Author "Calafut, V"

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    The Atacama Cosmology Telescope: Detection of the pairwise kinematic Sunyaev-Zel'dovich effect with SDSS DR15 galaxies
    (2021) Calafut, V; Gallardo, P. A.; Vavagiakis, E. M.; Amodeo, S.; Aiola, S.; Austermann, J. E.; Battaglia, N.; Battistelli, E. S.; Beall, J. A.; Bean, R.; Bond, J. R.; Calabrese, E.; Choi, S. K.; Cothard, N. F.; Devlin, M. J.; Duell, C. J.; Duff, S. M.; Duivenvoorden, A. J.; Dunkley, J.; Dunner, R.; Ferraro, S.; Guan, Y.; Hill, J. C.; Hilton, G. C.; Hilton, M.; Hlozek, R.; Huber, Z. B.; Hubmayr, J.; Huffenberger, K. M.; Hughes, J. P.; Koopman, B. J.; Kosowsky, A.; Li, Y.; Lokken, M.; Madhavacheril, M.; McMahon, J.; Moodley, K.; Naess, S.; Nati, F.; Newburgh, L. B.; Niemack, M. D.; Page, L. A.; Partridge, B.; Schaan, E.; Schillaci, A.; Sifon, C.; Spergel, D. N.; Staggs, S. T.; Ullom, J. N.; Vale, L. R.; Van Engelen, A.; Van Lanen, J.; Wollack, E. J.; Xu, Z.
    We present a 5.4 sigma detection of the pairwise kinematic Sunyaev-Zeldovich (kSZ) effect using Atacama Cosmology Telescope (ACT) and Planck CMB observations in combination with Luminous Red Galaxy samples from the Sloan Digital Sky Survey (SDSS) DR15 catalog. Results are obtained using three ACT CMB maps: co-added 150 and 98 GHz maps, combining observations from 2008-2018 (ACT DR5), which overlap with SDSS DR15 over 3,700 sq. deg., and a component-separated map using night-time only observations from 2014-2015 (ACT DR4), overlapping with SDSS DR15 over 2,089 sq. deg. Comparisons of the results from these three maps provide consistency checks in relation to potential frequency-dependent foreground contamination. A total of 343,647 galaxies are used as tracers to identify and locate galaxy groups and clusters from which the kSZ signal is extracted using aperture photometry. We consider the impact of various aperture photometry assumptions and covariance estimation methods on the signal extraction. Theoretical predictions of the pairwise velocities are used to obtain best-fit, mass-averaged, optical depth estimates for each of five luminosity-selected tracer samples. A comparison of the kSZ-derived optical depth measurements obtained here to those derived from the thermal SZ effect for the same sample is presented in a companion paper.
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    The Atacama Cosmology Telescope: Probing the baryon content of SDSS DR15 galaxies with the thermal and kinematic Sunyaev-Zel'dovich effects
    (2021) Vavagiakis, E. M.; Gallardo, P. A.; Calafut, V; Amodeo, S.; Aiola, S.; Austermann, J. E.; Battaglia, N.; Battistelli, E. S.; Beall, J. A.; Bean, R.; Bond, J. R.; Calabrese, E.; Choi, S. K.; Cothard, N. F.; Devlin, M. J.; Duell, C. J.; Duff, S. M.; Duivenvoorden, A. J.; Dunkley, J.; Dunner, R.; Ferraro, S.; Guan, Y.; Hill, J. C.; Hilton, G. C.; Hilton, M.; Hlozek, R.; Huber, Z. B.; Hubmayr, J.; Huffenberger, K. M.; Hughes, J. P.; Koopman, B. J.; Kosowsky, A.; Li, Y.; Lokken, M.; Madhavacheril, M.; McMahon, J.; Moodley, K.; Naess, S.; Nati, F.; Newburgh, L. B.; Niemack, M. D.; Page, L. A.; Partridge, B.; Schaan, E.; Schillaci, A.; Sifon, C.; Spergel, D. N.; Staggs, S. T.; Ullom, J. N.; Vale, L. R.; Van Engelen, A.; Van Lanen, J.; Wollack, E. J.; Xu, Z.
    We present measurements of the average thermal Sunyaev Zel'dovich (tSZ) effect from optically selected galaxy groups and clusters at high signal-to-noise (up to 12 sigma) and estimate their baryon content within a 2.10 radius aperture. Sources from the Sloan Digital Sky Survey Baryon Oscillation Spectroscopic Survey DR15 catalog overlap with 3,700 sq deg of sky observed by the Atacama Cosmology Telescope (ACT) from 2008 to 2018 at 150 and 98 GHz (ACT DR5), and 2,089 sq deg of internal linear combination component-separated maps combining ACT and Planck data (ACT DR4). The corresponding optical depths tau, which depend on the baryon content of the halos, are estimated using results from cosmological hydrodynamic simulations assuming an active galactic nuclei feedback radiative cooling model. We estimate the mean mass of the halos in multiple luminosity bins, and compare the tSZ-based tau estimates to theoretical predictions of the baryon content for a Navarro-Frenk-White profile. We do the same for tau estimates extracted from fits to pairwise baryon momentum measurements of the kinematic Sunyaev-Zel'dovich effect (kSZ) for the same dataset obtained in a companion paper. We find that the tau estimates from the tSZ measurements in this work and the kSZ measurements in the companion paper agree within 1 sigma for two out of the three disjoint luminosity bins studied, while they differ by 2-3 sigma in the highest luminosity bin. The optical depth estimates account for one-third to all of the theoretically predicted baryon content in the halos across luminosity bins. Potential systematic uncertainties are discussed. The tSZ and kSZ measurements provide a step toward empirical Compton-y-tau relationships to provide new tests of cluster formation and evolution models.