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  Star Formation Histories of the LEGUS Spiral Galaxies. I. The Flocculent Spiral NGC 7793

Sacchi, E., Cignoni, M., Aloisi, A., Tosi, M., Adamo, A., Dale, D. A., et al. (2019). Star Formation Histories of the LEGUS Spiral Galaxies. I. The Flocculent Spiral NGC 7793. The Astrophysical Journal, 878.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-CFDE-9 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-CFDF-8
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...878....1S (Any fulltext)
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 Creators:
Sacchi, E.1, Author
Cignoni, M.1, Author
Aloisi, A.1, Author
Tosi, M.1, Author
Adamo, A.1, Author
Dale, D. A.1, Author
Elmegreen, B. G.1, Author
Elmegreen, D. M.1, Author
Calzetti, D.1, Author
Gouliermis, D. A.1, Author
Grasha, K.1, Author
Smith, L. J.1, Author
Wofford, A.1, Author
Lee, J. C.1, Author
Sabbi, E.1, Author
Ubeda, L.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: evolution galaxies: individual: NGC 7793 galaxies: spiral galaxies: star formation galaxies: stellar content Astrophysics - Astrophysics of Galaxies
 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 ‚àº3.7 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 M ‚òâ yr‚àí1 over the whole Hubble time, corresponding to a total stellar mass of (3.09 ¬± 0.33) 109 M ‚òâ, 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. Based on observations obtained with the NASA/ESA Hubble Space Telescope at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy under NASA Contract NAS 5-26555.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 878 Sequence Number: - Start / End Page: - Identifier: -