Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES
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| Format: | Preprint |
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2025
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| author | Treiber, Helena Amon, Alexandra Wechsler, Risa H. Manwadkar, Viraj Myles, Justin Hahn, ChangHoon Hearin, Andrew Heydenreich, Sven Saintonge, Amélie Saraf, Manasvee Aguilar, Jessica Nicole Ahlen, Steven Anand, Abhijeet Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cooper, Andrew P. Cuceu, Andrei de la Macorra, Axel Dey, Biprateep Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Huterer, Dragan Joyce, Dick Juneau, Stephanie Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| author_facet | Treiber, Helena Amon, Alexandra Wechsler, Risa H. Manwadkar, Viraj Myles, Justin Hahn, ChangHoon Hearin, Andrew Heydenreich, Sven Saintonge, Amélie Saraf, Manasvee Aguilar, Jessica Nicole Ahlen, Steven Anand, Abhijeet Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cooper, Andrew P. Cuceu, Andrei de la Macorra, Axel Dey, Biprateep Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Huterer, Dragan Joyce, Dick Juneau, Stephanie Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| contents | We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) calibrated with DESI redshifts. Using DESI spectroscopy from the first data release, we construct clean samples of galaxies with median stellar masses $\log_{10}(M_*/M_{\odot})=8.3-10.1$ and measure their weak lensing signals with sources from DES, KiDS, and SDSS, achieving detections with $S/N$ up to 14 for dwarf galaxies ($\log_{10}(M_*/M_{\odot})<$9.25) -- opening up a new regime for lensing measurements of low-mass systems. Leveraging DES photometry calibrated with DESI, we extend to a photometric dwarf sample of over 700,000 galaxies, enabling robust lensing detections of dwarf galaxies with combined $S/N=38$ and a significant measurement down to $\log_{10}(M_*/M_{\odot})=8.0$. We show that the one-halo regime (scales $\lesssim 0.15h^{-1}\rm Mpc$) is insensitive to various systematic and sample selection effects, providing robust halo mass estimates, while the signal in the two-halo regime depends on galaxy color and environment. These results demonstrate that DESI already enables precise dwarf lensing measurements, and that calibrated photometric samples extend this capability. Together, they pave the way for novel constraints on dwarf galaxy formation and dark matter physics with upcoming surveys like the Vera C. Rubin Observatory's LSST. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20434 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES Treiber, Helena Amon, Alexandra Wechsler, Risa H. Manwadkar, Viraj Myles, Justin Hahn, ChangHoon Hearin, Andrew Heydenreich, Sven Saintonge, Amélie Saraf, Manasvee Aguilar, Jessica Nicole Ahlen, Steven Anand, Abhijeet Bianchi, Davide Brooks, David Castander, Francisco Javier Claybaugh, Todd Cooper, Andrew P. Cuceu, Andrei de la Macorra, Axel Dey, Biprateep Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Gutierrez, Gaston Huterer, Dragan Joyce, Dick Juneau, Stephanie Kremin, Anthony Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Nadathur, Seshadri Percival, Will J. Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics We present the most precise and lowest-mass weak lensing measurements of dwarf galaxies to date, enabled by spectroscopic lenses from the Dark Energy Spectroscopic Instrument (DESI) and photometric lenses from the Dark Energy Survey (DES) calibrated with DESI redshifts. Using DESI spectroscopy from the first data release, we construct clean samples of galaxies with median stellar masses $\log_{10}(M_*/M_{\odot})=8.3-10.1$ and measure their weak lensing signals with sources from DES, KiDS, and SDSS, achieving detections with $S/N$ up to 14 for dwarf galaxies ($\log_{10}(M_*/M_{\odot})<$9.25) -- opening up a new regime for lensing measurements of low-mass systems. Leveraging DES photometry calibrated with DESI, we extend to a photometric dwarf sample of over 700,000 galaxies, enabling robust lensing detections of dwarf galaxies with combined $S/N=38$ and a significant measurement down to $\log_{10}(M_*/M_{\odot})=8.0$. We show that the one-halo regime (scales $\lesssim 0.15h^{-1}\rm Mpc$) is insensitive to various systematic and sample selection effects, providing robust halo mass estimates, while the signal in the two-halo regime depends on galaxy color and environment. These results demonstrate that DESI already enables precise dwarf lensing measurements, and that calibrated photometric samples extend this capability. Together, they pave the way for novel constraints on dwarf galaxy formation and dark matter physics with upcoming surveys like the Vera C. Rubin Observatory's LSST. |
| title | Dwarf galaxy halo masses from spectroscopic and photometric lensing in DESI and DES |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.20434 |