Browsing by Author "Bond, J. R."

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    Atacama Cosmology Telescope : Component-separated maps of CMB temperature and the thermal Sunyaev-Zel'dovich effect
    (2020) Madhavacheril, M. S.; Hill, J. C.; Naes, S.; Addison, G. E.; Aiola, S.; Baildon, T.; Battaglia, N.; Bean, R.; Bond, J. R.; Dünner Planella, Rolando; Calabrese, E.; Calafut, V.; Choi, S. K.; Darwish, O.; Datta, R.; Devlin, M. J.; Dunkley, J.; Ferraro, S.; Gallardo, P. A.; Gluscevic, V.; Halpern, M.; Han, D. W.; Hasselfield, M.; Hilton, M.; Hincks, A. D.; Hlozek, R.; Ho, S. P. P.; Huffenberger, K. M.; Hughes, J. P.; Koopman, B. J.; Kosowsky, A.; Lokken, M.; Louis, T.; Lungu, M.; MacInnis, A.; Maurin, Loïc Benjamin; McMahon, J. J.; Moodley, K.; Nati, F.; Niemack, M. D.; Page, L. A.; Partridge, B.; Robertson, N.; Sehgal, N.; Schaan, E.; Schillaci, A.; Sherwin, B. D.; Sifon, C.; Simon, S. M.; Spergel, D. N.
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    Atacama Cosmology Telescope : Dusty Star-forming Galaxies and Active Galactic Nuclei in the Equatorial Survey
    (2020) Gralla, M. B.; Marriage, T. A.; Addison, G.; Baker, A. J.; Bond, J. R.; Crichton, D.; Datta, R.; Devlin, M. J.; Dunkley, J.; Dünner Planella, Rolando; Fowler, J.; Gallardo, P. A.; Hall, K.; Halpern, M.; Hasselfield, M.; Hilton, M.; Hincks, A. D.; Huffenberger, K. M.; Hughes, J. P.; Kosowsky, A.; Lopez Caraballo, C. H.; Louis, T.; Marsden, D.; Moodley, K.; Niemack, M. D.; Page, L. A.; Partridge, B.; Rivera, J.; Sievers, J. L.; Staggs, S.; Su, T.; Swetz, D.; Wollack, E. J.
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    Cosmology from cross-correlation of ACT-DR4 CMB lensing and DES-Y3 cosmic shear
    (2024) Shaikh, S.; Harrison, I; van Engelen, A.; Alves, O.; Marques, G. A.; Abbott, T. M. C.; Aguena, M.; Amon, A.; An, R.; Bacon, D.; Battaglia, N.; Becker, M. R.; Bernstein, G. M.; Bertin, E.; Blazek, J.; Bond, J. R.; Brooks, D.; Burke, D. L.; Calabrese, E.; Carnero Rosell, A.; Carretero, J.; Cawthon, R.; Chang, C.; Chen, R.; Choi, A.; Choi, S. K.; da Costa, L. N.; Pereira, M. E. S.; Darwish, O.; Davis, T. M.; Desai, S.; Devlin, M.; Diehl, H. T.; Doel, P.; Doux, C.; Elvin-Poole, J.; Farren, G. S.; Ferraro, S.; Ferrero, I; Ferte, A.; Flaugher, B.; Frieman, J.; Garcia-Bellido, J.; Gatti, M.; Giannini, G.; Giardiello, S.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Hill, J. C.; Hinton, S. R.; Hollowood, D. L.; Honscheid, K.; Huffenberger, K. M.; Huterer, D.; James, D. J.; Jarvis, M.; Jeffrey, N.; Jense, H. T.; Knowles, K.; Kim, J.; Kramer, D.; Lahav, O.; Lee, S.; Lima, M.; MacCrann, N.; Madhavacheril, M. S.; Marshall, J. L.; McCullough, J.; Mehta, Y.; Mena-Fernandez, J.; Miquel, R.; Mohr, J. J.; Moodley, K.; Myles, J.; Navarro-Alsina, A.; Newburgh, L.; Niemack, M. D.; Omori, Y.; Pandey, S.; Partridge, B.; Pieres, A.; Malagon, A. A. Plazas; Porredon, A.; Prat, J.; Qu, F. J.; Robertson, N.; Rollins, R. P.; Roodman, A.; Samuroff, S.; Sanchez, C.; Sanchez, E.; Cid, D. Sanchez; Secco, L. F.; Sehgal, N.; Sheldon, E.; Sherwin, B. D.; Shin, T.; Sifon, C.; Smith, M.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Troxel, M. A.; Tutusaus, I; Vargas, C.; Weaverdyck, N.; Wiseman, P.; Yamamoto, M.; Zuntz, J.
    Cross-correlation between weak lensing of the Cosmic Microwave Background (CMB) and weak lensing of galaxies offers a way to place robust constraints on cosmological and astrophysical parameters with reduced sensitivity to certain systematic effects affecting individual surveys. We measure the angular cross-power spectrum between the Atacama Cosmology Telescope (ACT) DR4 CMB lensing and the galaxy weak lensing measured by the Dark Energy Survey (DES) Y3 data. Our baseline analysis uses the CMB convergence map derived from ACT-DR4 and Planck data, where most of the contamination due to the thermal Sunyaev Zel'dovich effect is removed, thus avoiding important systematics in the cross-correlation. In our modelling, we consider the nuisance parameters of the photometric uncertainty, multiplicative shear bias and intrinsic alignment of galaxies. The resulting cross-power spectrum has a signal-to-noise ratio = 7.1 and passes a set of null tests. We use it to infer the amplitude of the fluctuations in the matter distribution (S-8 equivalent to sigma(8) (Omega(m)/0.3)(0.5) = 0.782 +/- 0.059) with informative but well-motivated priors on the nuisance parameters. We also investigate the validity of these priors by significantly relaxing them and checking the consistency of the resulting posteriors, finding them consistent, albeit only with relatively weak constraints. This cross-correlation measurement will improve significantly with the new ACT-DR6 lensing map and form a key component of the joint 6x2pt analysis between DES and ACT.
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    Kinematic Sunyaev-Zel'dovich effect with ACT, DES, and BOSS: A novel hybrid estimator
    (2023) Mallaby-Kay, M.; Amodeo, S.; Hill, J. C.; Aguena, M.; Allam, S.; Alves, O.; Annis, J.; Battaglia, N.; Battistelli, E. S.; Baxter, E. J.; Bechtol, K.; Becker, M. R.; Bertin, E.; Bond, J. R.; Brooks, D.; Calabrese, E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Choi, A.; Crocce, M.; da Costa, L. N.; Pereira, M. E. S.; De Vicente, J.; Desai, S.; Dietrich, J. P.; Doel, P.; Doux, C.; Drlica-Wagner, A.; Dunkley, J.; Elvin-Poole, J.; Everett, S.; Ferraro, S.; Ferrero, I.; Frieman, J.; Gallardo, P. A.; Garcia-Bellido, J.; Giannini, G.; Gruen, D.; Gruendl, R. A.; Gutierrez, G.; Hinton, S. R.; Hollowood, D. L.; James, D. J.; Kosowsky, A.; Kuehn, K.; Lokken, M.; Louis, T.; Marshall, J. L.; McMahon, J.; Mena-Fernandez, J.; Menanteau, F.; Miquel, R.; Moodley, K.; Mroczkowski, T.; Naess, S.; Niemack, M. D.; Ogando, R. L. C.; Page, L.; Pandey, S.; Pieres, A.; Malagon, A. A. Plazas; Raveri, M.; Rodriguez-Monroy, M.; Rykoff, E. S.; Samuroff, S.; Sanchez, E.; Schaan, E.; Sevilla-Noarbe, I.; Sheldon, E.; Sifon, C.; Smith, M.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; To, C.; Vargas, C.; Vavagiakis, E. M.; Weaverdyck, N.; Weller, J.; Wiseman, P.; Yanny, B.
    The kinematic and thermal Sunyaev-Zel'dovich (kSZ and tSZ) effects probe the abundance and thermodynamics of ionized gas in galaxies and clusters. We present a new hybrid estimator to measure the kSZ effect by combining cosmic microwave background temperature anisotropy maps with photometric and spectroscopic optical survey data. The method interpolates a velocity reconstruction from a spectroscopic catalog at the positions of objects in a photometric catalog, which makes it possible to leverage the high number density of the photometric catalog and the precision of the spectroscopic survey. Combining this hybrid kSZ estimator with a measurement of the tSZ effect simultaneously constrains the density and temperature of free electrons in the photometrically selected galaxies. Using the 1000 deg2 of overlap between the Atacama Cosmology Telescope (ACT) Data Release 5, the first three years of data from the Dark Energy Survey (DES), and the Baryon Oscillation Spectroscopic Survey (BOSS) Data Release 12, we detect the kSZ signal at 4.8 & sigma; and reject the null (no-kSZ) hypothesis at 5.1 & sigma;. This corresponds to 2.0 & sigma; per 100,000 photometric objects with a velocity field based on a spectroscopic survey with 1=5th the density of the photometric catalog. For comparison, a recent ACT analysis using exclusively spectroscopic data from BOSS measured the kSZ signal at 2.1 & sigma; per 100,000 objects. Our derived constraints on the thermodynamic properties of the galaxy halos are consistent with previous measure-ments. With future surveys, such as the Dark Energy Spectroscopic Instrument and the Rubin Observatory Legacy Survey of Space and Time, we expect that this hybrid estimator could result in measurements with significantly better signal-to-noise than those that rely on spectroscopic data alone.
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    The Atacama Cosmology Telescope (ACT): Beam Profiles and First SZ Cluster Maps
    (2010) Hincks, A. D.; Acquaviva, V.; Ade, P. A. R.; Aguirre, P.; Amiri, M.; Appel, J. W.; Barrientos, L. F.; Battistelli, E. S.; Bond, J. R.; Brown, B.; Burger, B.; Chervenak, J.; Das, S.; Devlin, M. J.; Dicker, S. R.; Doriese, W. B.; Dunkley, J.; Dünner, R.; Essinger-Hileman, T.; Fisher, R. P.; Fowler, J. W.; Hajian, A.; Halpern, M.; Hasselfield, M.; Hernández-Monteagudo, C.; Hilton, G. C.; Hilton, M.; Hlozek, R.; Huffenberger, K. M.; Hughes, D. H.; Hughes, J. P.; Infante, L.; Irwin, K. D.; Jimenez, R.; Juin, J. B.; Kaul, M.; Klein, J.; Kosowsky, A.; Lau, J. M.; Limon, M.; Lin, Y. -T.; Lupton, R. H.; Marriage, T. A.; Marsden, D.; Martocci, K.; Mauskopf, P.; Menanteau, F.; Moodley, K.; Moseley, H.; Netterfield, C. B.; Niemack, M. D.; Nolta, M. R.; Page, L. A.; Parker, L.; Partridge, B.; Quintana, H.; Reid, B.; Sehgal, N.; Sievers, J.; Spergel, D. N.; Staggs, S. T.; Stryzak, O.; Swetz, D. S.; Switzer, E. R.; Thornton, R.; Trac, H.; Tucker, C.; Verde, L.; Warne, R.; Wilson, G.; Wollack, E.; Zhao, Y.
    The Atacama Cosmology Telescope (ACT) is currently observing the cosmic microwave background with arcminute resolution at 148 GHz, 218 GHz, and 277 GHz. In this paper, we present ACT's first results. Data have been analyzed using a maximum-likelihood map-making method which uses B-splines to model and remove the atmospheric signal. It has been used to make high-precision beam maps from which we determine the experiment's window functions. This beam information directly impacts all subsequent analyses of the data. We also used the method to map a sample of galaxy clusters via the Sunyaev-Zel'dovich (SZ) effect and show five clusters previously detected with X-ray or SZ observations. We provide integrated Compton-y measurements for each cluster. Of particular interest is our detection of the z = 0.44 component of A3128 and our current non-detection of the low-redshift part, providing strong evidence that the further cluster is more massive as suggested by X-ray measurements. This is a compelling example of the redshift-independent mass selection of the SZ effect.
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    The Atacama Cosmology Telescope : Weighing Distant Clusters with the Most Ancient Light
    (2020) Madhavacheril, M. S.; Sifón Andalaft, Cristóbal Javier; Battaglia, N.; Aiola, S.; Amodeo, S.; Austermann, J. E.; Beall, J. A.; Becker, D. T.; Bond, J. R.; Dünner Planella, Rolando; Calabrese, E.; Choi, S. K.; Denison, E. V.; Devlin, M. J.; Dicker, S. R.; Duff, S. M.; Duivenvoorden, A. J.; Dunkley, J.; Ferraro, S.; Gallardo, P. A.; Guan, Y. L.; Han, D. W.; Hill, J. C.; Hilton, G. C.; Hilton, M.; Hubmayr, J.; Huffenberger, K. M.; Hughes, J. P.; Koopman, B. J.; Kosowsky, A.; Van Lanen, J.; Lee, E.; Louis, T.; MacInnis, A.; McMahon, J.; Moodley, K.; Naess, S.; Namikawa, T.; Nati, F.; Newburgh, L.; Niemack, M. D.; Page, L. A.; Partridge, B.; Qu, F. J.; Robertson, N. C.; Salatino, M.; Schaan, E.; Schillaci, A.; Schmitt, B. L.; Sehgal, N.; Sherwin, B. D.; Simon, S. M.; Spergel, D. N.
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    The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev-Zel'dovich Galaxy Clusters
    (2021) Hilton, M.; Sifon, C.; Naess, S.; Madhavacheril, M.; Oguri, M.; Rozo, E.; Rykoff, E.; Abbott, T. M. C.; Adhikari, S.; Aguena, M.; Aiola, S.; Allam, S.; Amodeo, S.; Amon, A.; Annis, J.; Ansarinejad, B.; Aros-Bunster, C.; Austermann, J. E.; Avila, S.; Bacon, D.; Battaglia, N.; Beall, J. A.; Becker, D. T.; Bernstein, G. M.; Bertin, E.; Bhandarkar, T.; Bhargava, S.; Bond, J. R.; Brooks, D.; Burke, D. L.; Calabrese, E.; Carrasco Kind, M.; Carretero, J.; Choi, S. K.; Choi, A.; Conselice, C.; Costa, L. N. da; Costanzi, M.; Crichton, D.; Crowley, K. T.; Dunner, R.; Denison, E. V.; Devlin, M. J.; Dicker, S. R.; Diehl, H. T.; Dietrich, J. P.; Doel, P.; Duff, S. M.; Duivenvoorden, A. J.; Dunkley, J.; Everett, S.; Ferraro, S.; Ferrero, I.; Ferte, A.; Flaugher, B.; Frieman, J.; Gallardo, P. A.; Garcia-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Giles, P.; Golec, J. E.; Gralla, M. B.; Grandis, S.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Han, D.; Hartley, W. G.; Hasselfield, M.; Hill, J. C.; Hilton, G. C.; Hincks, A. D.; Hinton, S. R.; Ho, S-P. P.; Honscheid, K.; Hoyle, B.; Hubmayr, J.; Huffenberger, K. M.; Hughes, J. P.; Jaelani, A. T.; Jain, B.; James, D. J.; Jeltema, T.; Kent, S.; Knowles, K.; Koopman, B. J.; Kuehn, K.; Lahav, O.; Lima, M.; Lin, Y-T.; Lokken, M.; Loubser, S. I.; MacCrann, N.; Maia, M. A. G.; Marriage, T. A.; Martin, J.; McMahon, J.; Melchior, P.; Menanteau, F.; Miquel, R.; Miyatake, H.; Moodley, K.; Morgan, R.; Mroczkowski, T.; Nati, F.; Newburgh, L. B.; Niemack, M. D.; Nishizawa, A. J.; Ogando, R. L. C.; Orlowski-Scherer, J.; Page, L. A.; Palmese, A.; Partridge, B.; Paz-Chinchon, F.; Phakathi, P.; Plazas, A. A.; Robertson, N. C.; Romer, A. K.; Rosell, A. Carnero; Salatino, M.; Sanchez, E.; Schaan, E.; Schillaci, A.; Sehgal, N.; Serrano, S.; Shin, T.; Simon, S. M.; Smith, M.; Soares-Santos, M.; Spergel, D. N.; Staggs, S. T.; Storer, E. R.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Thomas, D.; To, C.; Trac, H.; Ullom, J. N.; Vale, L. R.; Lanen, J. Van; Vavagiakis, E. M.; Vicente, J. De; Wilkinson, R. D.; Wollack, E. J.; Xu, Z.; Zhang, Y.
    We present a catalog of 4195 optically confirmed Sunyaev-Zel'dovich (SZ) selected galaxy clusters detected with signal-to-noise ratio >4 in 13,211 deg(2) 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 < 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 versus mass-scaling relation calibrated from X-ray observations, the sample has a 90% completeness mass limit of M-500c > 3.8 x 10(14) M, evaluated at z = 0.5, for clusters detected at signal-to-noise ratio >5 in maps filtered at an angular scale of 24. 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(2)), the Hyper Suprime-Cam Subaru Strategic Program (469 deg(2)), and the Kilo Degree Survey (825 deg(2)). 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 ATACAMA COSMOLOGY TELESCOPE: A MEASUREMENT OF THE 600 < ℓ < 8000 COSMIC MICROWAVE BACKGROUND POWER SPECTRUM AT 148 GHz
    (2010) Fowler, J. W.; Acquaviva, V.; Ade, P. A. R.; Aguirre, P.; Amiri, M.; Appel, J. W.; Barrientos, L. F.; Battistelli, E. S.; Bond, J. R.; Brown, B.; Burger, B.; Chervenak, J.; Das, S.; Devlin, M. J.; Dicker, S. R.; Doriese, W. B.; Dunkley, J.; Dünner, R.; Essinger-Hileman, T.; Fisher, R. P.; Hajian, A.; Halpern, M.; Hasselfield, M.; Hernández-Monteagudo, C.; Hilton, G. C.; Hilton, M.; Hincks, A. D.; Hlozek, R.; Huffenberger, K. M.; Hughes, D. H.; Hughes, J. P.; Infante, L.; Irwin, K. D.; Jimenez, R.; Juin, J. B.; Kaul, M.; Klein, J.; Kosowsky, A.; Lau, J. M.; Limon, M.; Lin, Y. -T.; Lupton, R. H.; Marriage, T. A.; Marsden, D.; Martocci, K.; Mauskopf, P.; Menanteau, F.; Moodley, K.; Moseley, H.; Netterfield, C. B.; Niemack, M. D.; Nolta, M. R.; Page, L. A.; Parker, L.; Partridge, B.; Quintana, H.; Reid, B.; Sehgal, N.; Sievers, J.; Spergel, D. N.; Staggs, S. T.; Swetz, D. S.; Switzer, E. R.; Thornton, R.; Trac, H.; Tucker, C.; Verde, L.; Warne, R.; Wilson, G.; Wollack, E.; Zhao, Y.
    We present a measurement of the angular power spectrum of the cosmic microwave background (CMB) radiation observed at 148 GHz. The measurement uses maps with 1'.4 angular resolution made with data from the Atacama Cosmology Telescope (ACT). The observations cover 228 deg(2) of the southern sky, in a 4 degrees.2 wide strip centered on declination 53 degrees south. The CMB at arcminute angular scales is particularly sensitive to the Silk damping scale, to the Sunyaev-Zel'dovich (SZ) effect from galaxy clusters, and to emission by radio sources and dusty galaxies. After masking the 108 brightest point sources in our maps, we estimate the power spectrum between 600 < l < 8000 using the adaptive multi-taper method to minimize spectral leakage and maximize use of the full data set. Our absolute calibration is based on observations of Uranus. To verify the calibration and test the fidelity of our map at large angular scales, we cross-correlate the ACT map to the WMAP map and recover the WMAP power spectrum from 250 < l < 1150. The power beyond the Silk damping tail of the CMB (l similar to 5000) is consistent with models of the emission from point sources. We quantify the contribution of SZ clusters to the power spectrum by fitting to a model normalized to sigma(8) = 0.8. We constrain the model's amplitude A(SZ) < 1.63 (95% CL). If interpreted as a measurement of sigma(8), this implies sigma(SZ)(8) < 0.86 (95% CL) given our SZ model. A fit of ACT and WMAP five-year data jointly to a six-parameter Lambda CDM model plus point sources and the SZ effect is consistent with these results.
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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.