{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-mass-profiles-of-dwarf-galaxies-from-dark","title":"The mass profiles of dwarf galaxies from Dark Energy Survey lensing","arxiv_id":"2311.14659","date":"2023-11-24","proceeding":null,"authors":["Joseph Thornton","Alexandra Amon","Risa H. Wechsler","Susmita Adhikari","Yao-Yuan Mao","Justin Myles","Marla Geha","Nitya Kallivayalil","Erik Tollerud","Benjamin Weiner"],"abstract":"We present a novel approach to extracting dwarf galaxies from photometric data to measure their average halo mass profile with weak lensing. We characterise their stellar mass and redshift distributions with a spectroscopic calibration sample. Using the ${\\sim}5000\\mathrm{deg}^2$ multi-band photometry from Dark Energy Survey and redshifts from the Satellites Around Galactic Analogs (SAGA) survey with an unsupervised machine learning method, we select a low-mass galaxy sample spanning redshifts $z{<}0.3$ and divide it into three mass bins. From low to high median mass, the bins contain [146 420, 330 146, 275 028] galaxies and have median stellar masses of $\\log_{10}(M_*/M_{\\odot})= [8.52^{+0.57}_{-0.76}, 9.02^{+0.50}_ {-0.64}, 9.49^{+0.50}_{-0.58}]$. We measure the stacked excess surface mass density profiles, $\\Delta\\Sigma(R)$, of these galaxies using galaxy--galaxy lensing with a signal-to-noise of [14, 23, 28]. Through a simulation-based forward-modelling approach, we fit the measurements to constrain the stellar-to-halo mass relation and find the median halo mass of these samples to be $\\log_{10}(M_{\\rm halo}/M_{\\odot})$ = [$10.67\\substack{+0.2\\\\-0.4}$, $11.01\\substack{+0.14 \\\\ -0.27}$,$11.40\\substack{+0.08\\\\-0.15}$]. The CDM profiles are consistent with NFW profiles over scales ${\\lesssim}0.15 \\rm{h}^{-1}$Mpc. We find that ${\\sim}20$ per cent of the dwarf galaxy sample are satellites. This is the first measurement of the halo profiles and masses of such a comprehensive, low-mass galaxy sample. The techniques presented here pave the way for extracting and analysing even lower-mass dwarf galaxies and for more finely splitting galaxies by their properties with future photometric and spectroscopic survey data.","url_abs":"https://arxiv.org/abs/2311.14659v1","url_pdf":"https://arxiv.org/pdf/2311.14659v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-mass-profiles-of-dwarf-galaxies-from-dark","repo_url":"https://github.com/aamon/dwarf-lensing","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}