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

E. Sacchi; M. Cignoni; A. Aloisi; M. Tosi; A. Adamo; D. A. Dale; B. G. Elmegreen; D. M. Elmegreen; D. Calzetti; D. A. Gouliermis; K. Grasha; L. J. Smith; A. Wofford; J. C. Lee; E. Sabbi; L. Ubeda

doi:10.3847/1538-4357/ab1de1

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

E. Sacchi, M. Cignoni, A. Aloisi, M. Tosi, A. Adamo, D. A. Dale, B. G. Elmegreen, D. M. Elmegreen, D. Calzetti, D. A. Gouliermis, K. Grasha, L. J. Smith, A. Wofford, J. C. Lee, E. Sabbi, L. Ubeda

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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 M _o yr^-1 over the whole Hubble time, corresponding to a total stellar mass of (3.09 ± 0.33) ×10⁹ M _o, 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.

Original language	English
Article number	1
Journal	Astrophysical Journal
Volume	878
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/ab1de1
Publication status	Published - 10 Jun 2019

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Sacchi, E., Cignoni, M., Aloisi, A., Tosi, M., Adamo, A., Dale, D. A., Elmegreen, B. G., Elmegreen, D. M., Calzetti, D., Gouliermis, D. A., Grasha, K., Smith, L. J., Wofford, A., Lee, J. C., Sabbi, E., & Ubeda, L. (2019). Star Formation Histories of the LEGUS Spiral Galaxies. I. the Flocculent Spiral NGC 7793. Astrophysical Journal, 878(1), Article 1. https://doi.org/10.3847/1538-4357/ab1de1

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title = "Star Formation Histories of the LEGUS Spiral Galaxies. I. the Flocculent Spiral NGC 7793",

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 M o yr-1 over the whole Hubble time, corresponding to a total stellar mass of (3.09 ± 0.33) ×109 M o, 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.",

keywords = "galaxies: evolution, galaxies: individual (NGC 7793), galaxies: spiral, galaxies: star formation, galaxies: stellar content",

author = "E. Sacchi and M. Cignoni and A. Aloisi and M. Tosi and A. Adamo and Dale, {D. A.} and Elmegreen, {B. G.} and Elmegreen, {D. M.} and D. Calzetti and Gouliermis, {D. A.} and K. Grasha and Smith, {L. J.} and A. Wofford and Lee, {J. C.} and E. Sabbi and L. Ubeda",

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doi = "10.3847/1538-4357/ab1de1",

language = "English",

volume = "878",

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T1 - Star Formation Histories of the LEGUS Spiral Galaxies. I. the Flocculent Spiral NGC 7793

AU - Sacchi, E.

AU - Cignoni, M.

AU - Aloisi, A.

AU - Tosi, M.

AU - Adamo, A.

AU - Dale, D. A.

AU - Elmegreen, B. G.

AU - Elmegreen, D. M.

AU - Calzetti, D.

AU - Gouliermis, D. A.

AU - Grasha, K.

AU - Smith, L. J.

AU - Wofford, A.

AU - Lee, J. C.

AU - Sabbi, E.

AU - Ubeda, L.

PY - 2019/6/10

Y1 - 2019/6/10

N2 - 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 M o yr-1 over the whole Hubble time, corresponding to a total stellar mass of (3.09 ± 0.33) ×109 M o, 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.

AB - 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 M o yr-1 over the whole Hubble time, corresponding to a total stellar mass of (3.09 ± 0.33) ×109 M o, 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.

KW - galaxies: evolution

KW - galaxies: individual (NGC 7793)

KW - galaxies: spiral

KW - galaxies: star formation

KW - galaxies: stellar content

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U2 - 10.3847/1538-4357/ab1de1

DO - 10.3847/1538-4357/ab1de1

M3 - Article

SN - 0004-637X

VL - 878

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 1

ER -

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

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