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Weak Gravitational Lensing around Low Surface Brightness Galaxies in the DES Year 3 Data
Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA.
Nordita SU; Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA.
School of Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK.
Antal upphovsmän: 1052024 (Engelska)Ingår i: Open Journal of Astrophysics, E-ISSN 2565-6120, Vol. 7Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We present galaxy-galaxy lensing measurements using a sample of low surface brightness galaxies (LSBGs) drawn from the Dark Energy Survey Year 3 (Y3) data as lenses. LSBGs are diffuse galaxies with a surface brightness dimmer than the ambient night sky. These dark-matter-dominated objects are intriguing due to potentially unusual formation channels that lead to their diffuse stellar component. Given the faintness of LSBGs, using standard observational techniques to characterize their total masses proves challenging. Weak gravitational lensing, which is less sensitive to the stellar component of galaxies, could be a promising avenue to estimate the masses of LSBGs. Our LSBG sample consists of 23,790 galaxies separated into red and blue color types at g−i≥0.60 and g−i<0.60, respectively. Combined with the DES Y3 shear catalog, we measure the tangential shear around these LSBGs and find signal-to-noise ratios of 6.67 for the red sample, 2.17 for the blue sample, and 5.30 for the full sample. We use the clustering redshifts method to obtain redshift distributions for the red and blue LSBG samples. Assuming all red LSBGs are satellites, we fit a simple model to the measurements and estimate the host halo mass of these LSBGs to be log(Mhost/M⊙)=12.98+0.10−0.11. We place a 95% upper bound on the subhalo mass at log(Msub/M⊙)<11.51. By contrast, we assume the blue LSBGs are centrals, and place a 95% upper bound on the halo mass at log(Mhost/M⊙)<11.84. We find that the stellar-to-halo mass ratio of the LSBG samples is consistent with that of the general galaxy population. This work illustrates the viability of using weak gravitational lensing to constrain the halo masses of LSBGs.

Ort, förlag, år, upplaga, sidor
Maynooth University , 2024. Vol. 7
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URN: urn:nbn:se:kth:diva-367493DOI: 10.33232/001c.124536Scopus ID: 2-s2.0-105002293951OAI: oai:DiVA.org:kth-367493DiVA, id: diva2:1984916
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Tillgänglig från: 2025-07-18 Skapad: 2025-07-18 Senast uppdaterad: 2025-07-18Bibliografiskt granskad

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