# Star Formation Histories of the LEGUS Spiral Galaxies. I. The flocculent spiral NGC 7793

## TL;DR

This study uses Hubble Space Telescope data to analyze the star formation history of the flocculent spiral galaxy NGC 7793, revealing an inside-out growth pattern and providing detailed radial star formation rates over cosmic time.

## Contribution

First detailed radial star formation history of NGC 7793 derived from resolved stellar populations using HST data, highlighting inside-out galaxy growth.

## Key findings

- Average SFR of 0.23 Msun/yr over Hubble time.
- Radial variation shows increasing present-to-past SFR ratio outward.
- Supports inside-out galaxy growth model.

## Abstract

We present a detailed study of the flocculent spiral galaxy NGC 7793, part of the Sculptor group. By analyzing the resolved stellar populations of the galaxy, located at a distance of ~3.7 Mpc, we infer for the first time its radial star formation history (SFH) from Hubble Space Telescope photometry, thanks to both archival and new data from the Legacy ExtraGalactic UV Survey. We determine an average star formation rate (SFR) for the galaxy portion covered by our F555W and F814W data of 0.23 +- 0.02 Msun/yr over the whole Hubble time, corresponding to a total stellar mass of 3.09 +- 0.33 x 10^9 Msun in agreement with previous determinations. Thanks to the new data extending to the F336W band, we are able to analyze the youngest stellar populations with a higher time resolution. Most importantly, we recover the resolved SFH in different radial regions of the galaxy; this shows an indication of a growing trend of the present-to-past SFR ratio, increasing from internal to more external regions, supporting previous findings of the inside-out growth of the galaxy.