Stellar halos from The Dragonfly Edge-on Galaxies Survey
Colleen Gilhuly, Allison Merritt, Roberto Abraham, Shany Danieli,, Deborah Lokhorst, Qing Liu, Pieter van Dokkum, Charlie Conroy, Johnny Greco

TL;DR
This study investigates the stellar halos of twelve nearby edge-on galaxies using the Dragonfly Telephoto Array, revealing correlations with galaxy mass and comparing observations with cosmological simulations.
Contribution
It provides new observational data on stellar halo fractions across a range of galaxy masses and compares these with theoretical predictions.
Findings
Stellar halo fractions vary widely among galaxies.
A positive correlation exists between halo fraction and galaxy mass.
Observed halo fractions are slightly lower than simulation predictions.
Abstract
We present the primary results from the Dragonfly Edge-on Galaxies Survey (DEGS), an exploration of the stellar halos of twelve nearby ( Mpc) edge-on disc galaxies with the Dragonfly Telephoto Array. The edge-on orientation of these galaxies allows their stellar halos to be explored with minimal obscuration by or confusion with the much brighter disc light. Galaxies in the sample span a range of stellar masses from . We confirm that the wide range of stellar halo mass fractions previously seen for Milky Way-mass galaxies is also found among less massive spiral galaxies. The scatter in stellar halo mass fraction is large but we do find a significant positive correlation between stellar halo mass fraction and total stellar mass when the former is measured beyond five half-mass radii. Reasonably good agreement is found with predictions from…
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