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Deep Photometric Observations of Ultra-Faint Milky Way Satellites Centaurus I and Eridanus IV
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Deep Photometric Observations of Ultra-Faint Milky Way Satellites Centaurus I and Eridanus IV
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Paper
Deep Photometric Observations of Ultra-Faint Milky Way Satellites Centaurus I and Eridanus IV
2025
Overview
We present deep Magellan\\(+\\)Megacam imaging of Centaurus I (Cen I) and Eridanus IV (Eri IV), two recently discovered Milky Way ultra-faint satellites. Our data reach \\(\\sim2-3\\) magnitudes deeper than the discovery data from the DECam Local Volume Exploration (DELVE) Survey. We use these data to constrain their distances, structural properties (e.g., half-light radii, ellipticity, and position angle), and luminosities. We investigate whether these systems show signs of tidal disturbance, and identify new potential member stars using Gaia EDR3. Our deep color-magnitude diagrams show that Cen I and Eri IV are consistent with an old (\\(\\tau\\sim 13.0\\) Gyr) and metal-poor (\\(\\text{[Fe/H]}\\le-2.2\\)) stellar population. We find Cen I to have a half-light radius of \\(r_{h}=2.60\\pm0.30'\\) (\\(90.6\\pm11\\) pc), an ellipticity of \\(\\epsilon=0.36\\pm0.05\\), a distance of \\(D=119.8\\pm4.1\\) kpc (\\(m-M=20.39\\pm0.08\\) mag), and an absolute magnitude of \\(M_{V}=-5.39\\pm0.19\\). Similarly, Eri IV has \\(r_{h}=3.24\\pm0.48'\\) (\\(65.9\\pm10\\) pc), \\(\\epsilon=0.26\\pm0.09\\), \\(D=69.9\\pm3.6\\) kpc (\\(m-M=19.22\\pm0.11\\) mag), and \\(M_{V}=-3.55\\pm0.24\\). These systems occupy a space on the size-luminosity plane consistent with other known Milky Way dwarf galaxies which supports the findings from our previous spectroscopic follow-up. Cen I has a well-defined morphology which lacks any clear evidence of tidal disruption, whereas Eri IV hosts a significant extended feature with multiple possible interpretations.
Publisher
Cornell University Library, arXiv.org
Subject
