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Precision Kinematic Sunyaev--Zel'dovich Measurements Across Halo Mass and Redshift with DESI DR2 and ACT DR6: Part II. Bright Galaxy Survey and Emission-Line Galaxies

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Bibliographic Details
Main Authors:	Hadzhiyska, B., Ferraro, S., Qu, F. J., Guachalla, B. Ried, Schaan, E., Aguilar, J., Ahlen, S., Bianchi, D., Brooks, D., Castander, F. J., Chaussidon, E., Claybaugh, T., de la Macorra, A., Dey, Arjun, Dey, Biprateep, Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Guy, J., Honscheid, K., Howlett, C., Huterer, D., Ishak, M., Joyce, R., Kehoe, R., Kisner, T., Kremin, A., Lahav, O., Landriau, M., Guillou, L. Le, Leauthaud, A., Manera, M., Martini, P., Meisner, A., Miquel, R., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Samushia, L., Sanchez, E., Schlafly, E. F., Schlegel, D., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zhou, R., Zou, H.
Format:	Preprint
Published:	2026
Subjects:	Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Hadzhiyska, B. Ferraro, S. Qu, F. J. Guachalla, B. Ried Schaan, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Castander, F. J. Chaussidon, E. Claybaugh, T. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Landriau, M. Guillou, L. Le Leauthaud, A. Manera, M. Martini, P. Meisner, A. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlafly, E. F. Schlegel, D. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
author_facet	Hadzhiyska, B. Ferraro, S. Qu, F. J. Guachalla, B. Ried Schaan, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Castander, F. J. Chaussidon, E. Claybaugh, T. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Landriau, M. Guillou, L. Le Leauthaud, A. Manera, M. Martini, P. Meisner, A. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlafly, E. F. Schlegel, D. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H.
contents	We present the first high-significance spectroscopic stacked kinetic Sunyaev-Zel'dovich (kSZ) measurements of circumgalactic gas profiles for both Bright Galaxy Survey (BGS) and Emission Line Galaxy (ELG) tracers, combining DESI Data Release 2 with ACT Data Release 6. Using reconstructed line-of-sight velocities from the DESI galaxies and high-resolution ACT temperature maps, we detect the kSZ signal at high significance, reaching signal-to-noise ratios of up to $\sim$9 for BGS and $\sim$7.5 for ELGs in optimal stellar-mass selections. Together with the LRG measurements presented in Paper I, these constitute the most significant kSZ detections from any spectroscopic survey to date. We perform the analysis in both real and harmonic space, obtaining consistent results. By splitting both tracers into stellar-mass bins, we study the scaling of the kSZ amplitude with galaxy properties. Combining the kSZ measurements with ACT Data Release 6 (DR6) CMB lensing maps enables a joint calibration of the galaxy-halo connection and the gas fractions of host halos. For the BGS galaxies, we observe low gas fractions around the virial radius relative to standard expectations, likely attributable to active galactic nuclei (AGN) activity. We find some evidence for higher-mass halos retaining a larger fraction of their baryons, consistent with more efficient feedback in lower-mass systems. For the ELG sample, dominated by blue, star-forming galaxies, we provide the first detection of the gas distribution in ELG host halos. The ELGs appear to exhibit relatively high gas fractions, which points to the possibility of weaker feedback (due to e.g. low AGN and supernova feedback activity) at their mass scale. Finally, we present generalized Navarro-Frenk-White (GNFW) fits to the harmonic-space measurements, providing a compact parametrization of gas profiles for forward modeling in large-scale structure analyses.
format	Preprint
id	arxiv_https___arxiv_org_abs_2604_19745
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Precision Kinematic Sunyaev--Zel'dovich Measurements Across Halo Mass and Redshift with DESI DR2 and ACT DR6: Part II. Bright Galaxy Survey and Emission-Line Galaxies Hadzhiyska, B. Ferraro, S. Qu, F. J. Guachalla, B. Ried Schaan, E. Aguilar, J. Ahlen, S. Bianchi, D. Brooks, D. Castander, F. J. Chaussidon, E. Claybaugh, T. de la Macorra, A. Dey, Arjun Dey, Biprateep Doel, P. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Honscheid, K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kehoe, R. Kisner, T. Kremin, A. Lahav, O. Landriau, M. Guillou, L. Le Leauthaud, A. Manera, M. Martini, P. Meisner, A. Miquel, R. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Samushia, L. Sanchez, E. Schlafly, E. F. Schlegel, D. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies We present the first high-significance spectroscopic stacked kinetic Sunyaev-Zel'dovich (kSZ) measurements of circumgalactic gas profiles for both Bright Galaxy Survey (BGS) and Emission Line Galaxy (ELG) tracers, combining DESI Data Release 2 with ACT Data Release 6. Using reconstructed line-of-sight velocities from the DESI galaxies and high-resolution ACT temperature maps, we detect the kSZ signal at high significance, reaching signal-to-noise ratios of up to $\sim$9 for BGS and $\sim$7.5 for ELGs in optimal stellar-mass selections. Together with the LRG measurements presented in Paper I, these constitute the most significant kSZ detections from any spectroscopic survey to date. We perform the analysis in both real and harmonic space, obtaining consistent results. By splitting both tracers into stellar-mass bins, we study the scaling of the kSZ amplitude with galaxy properties. Combining the kSZ measurements with ACT Data Release 6 (DR6) CMB lensing maps enables a joint calibration of the galaxy-halo connection and the gas fractions of host halos. For the BGS galaxies, we observe low gas fractions around the virial radius relative to standard expectations, likely attributable to active galactic nuclei (AGN) activity. We find some evidence for higher-mass halos retaining a larger fraction of their baryons, consistent with more efficient feedback in lower-mass systems. For the ELG sample, dominated by blue, star-forming galaxies, we provide the first detection of the gas distribution in ELG host halos. The ELGs appear to exhibit relatively high gas fractions, which points to the possibility of weaker feedback (due to e.g. low AGN and supernova feedback activity) at their mass scale. Finally, we present generalized Navarro-Frenk-White (GNFW) fits to the harmonic-space measurements, providing a compact parametrization of gas profiles for forward modeling in large-scale structure analyses.
title	Precision Kinematic Sunyaev--Zel'dovich Measurements Across Halo Mass and Redshift with DESI DR2 and ACT DR6: Part II. Bright Galaxy Survey and Emission-Line Galaxies
topic	Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2604.19745