DDO68-C: HST confirms yet another companion of the isolated dwarf galaxy DDO 68
Matteo Correnti, Francesca Annibali, Michele Bellazzini, Mariarosa, Marinelli, Alessandra Aloisi, Michele Cignoni, Monica Tosi, Raffaele Pascale,, John M. Cannon, Lila Schisgal, Leslie K. Hunt, Elena Sacchi, Sangmo T. Sohn

TL;DR
Deep HST observations confirm DDO 68-C as a low-mass, star-forming dwarf galaxy physically associated with DDO 68, providing insights into its satellite system within the Lynx-Cancer Void.
Contribution
First detailed stellar analysis of DDO 68-C confirming it as a companion galaxy and measuring its distance, expanding understanding of dwarf galaxy interactions in voids.
Findings
DDO 68-C is at the same distance as DDO 68, confirming companionship.
DDO 68 hosts at least two other satellite galaxies.
DDO 68-C is a low-mass, star-forming galaxy with old stellar populations.
Abstract
We present the results of deep Hubble Space Telescope photometry of the dwarf galaxy DDO 68-C, proposed as possibly associated with the isolated peculiar dwarf DDO 68. The new data resolve for the first time the stars of DDO 68-C down to well below the tip of the Red Giant Branch (RGB), revealing a low mass (M 1.5 10 M) star forming galaxy with a backbone of old stars. By means of a fully homogeneous analysis and using the RGB tip as a standard candle, we find that DDO 68 and DDO 68-C lie at the same distance from us, within the uncertainties (D = 12.6 0.3 Mpc and D = 12.7 0.4 Mpc, respectively), thus confirming that the two dwarfs are physically associated. While paired dwarf galaxies with mutual projected distance similar to DDO 68 and DDO 68-C are not exceptional in the Lynx-Cancer Void where they live, DDO 68 remains a unicum as, in…
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Taxonomy
TopicsAstronomy and Astrophysical Research · Stellar, planetary, and galactic studies · Astronomical Observations and Instrumentation
