The star formation history of the Sculptor Dwarf Irregular Galaxy
Sophia Lianou (1), Andrew A. Cole (2) ((1) National Observatory of, Athens, (2) University of Tasmania)

TL;DR
This study reconstructs the detailed star formation history of the Sculptor Dwarf Irregular Galaxy using HST data, revealing a predominantly intermediate-age population, recent starburst activity, and a complex, interaction-independent evolutionary pattern.
Contribution
It provides the first detailed SFH of SDIG based on resolved stellar populations, highlighting recent bursts and spatial distribution of different age stars, with implications for dwarf galaxy evolution.
Findings
SDIG contains stars from 10 Myr to several Gyr old.
Recent star formation rate increased 2-3 times above average.
SDIG's SFH is complex and not driven by interactions.
Abstract
[abridged] We study the resolved stellar populations and derive the SFH of the SDIG, a gas-rich dwarf galaxy member of the NGC7793 subgroup in the Sculptor group. We construct a CMD using archival HST observations and examine its stellar content. We derive its SFH using a maximum-likelihood fit to the CMD. The CMD shows that SDIG contains stars from 10Myr to several Gyr old, as revealed from the MS, BL, luminous AGB, and RGB stars. The young stars with ages less than ~250Myr show a spatial distribution confined to its central regions, and additionally the young MS stars exhibit an off-center density peak. The intermediate-age and older stars are more spatially extended. SDIG is dominated by intermediate-age stars with an average age of 6.4Gyr. The average metallicity inferred is [M/H]\approx -1.5dex. Its SFH is consistent with a constant SFR, except for ages younger than ~200Myr. The…
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