Deep HST/UVIS Imaging of the Candidate Dark Galaxy CDG-1

Abstract CDG-1 is a tight grouping of four likely globular clusters in the Perseus cluster, and a candidate dark galaxy with little or no diffuse light. Here we provide new constraints on the luminosity of any underlying stellar emission, using Hubble Space Telescope/UVIS F200LP imaging. No diffuse...

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Published inResearch notes of the AAS Vol. 8; no. 5; pp. 135 - 134
Main Authors van Dokkum, Pieter, Li, Dayi David, Abraham, Roberto, Danieli, Shany, Eadie, Gwendolyn M., Harris, William E., Romanowsky, Aaron J.
Format Journal Article
LanguageEnglish
Published The American Astronomical Society 17.05.2024
Subjects
Dwarf galaxies
Globular star clusters
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Summary:Abstract CDG-1 is a tight grouping of four likely globular clusters in the Perseus cluster, and a candidate dark galaxy with little or no diffuse light. Here we provide new constraints on the luminosity of any underlying stellar emission, using Hubble Space Telescope/UVIS F200LP imaging. No diffuse emission is detected, with a 2 σ upper limit of F200LP > 28.1 mag arcsec −2 on the 5″ scale of CDG-1. This surface brightness limit corresponds to a 2 σ lower limit of >0.5 for the fraction of the total luminosity that is in the form of globular clusters. The most likely alternative, although improbable, is that CDG-1 is a chance grouping of four globular clusters in the halo of the Perseus galaxy IC 312.
Bibliography:AAS55028
Galaxies and Cosmology
ISSN:2515-5172
2515-5172
DOI:10.3847/2515-5172/ad4be6