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  • 2007.00663v1

    Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Francesco D’Eugenio, Arjen van der Wel, Po-Feng Wu (吳柏锋), Tania M Barone, Josha van Houdt, Rachel Bezanson, Caroline M S Straatman, Camilla Pacifici, Adam Muzzin, Anna Gallazzi, Vivienne Wild, David Sobral, Eric F Bell, Stefano Zibetti, Lamiya Mowla, Marijn Franx, Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C, Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 1, September 2020, Pages 389–404, is available online at: https://academic.oup.com/mnras/article-abstract/497/1/389/5872492

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Inverse stellar population age gradients of post-starburst galaxies at z=0.8 with LEGA-C

Research output: Contribution to journalJournal articlepeer-review

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  • Francesco D'Eugenio
  • Arjen van der Wel
  • Po-Feng Wu
  • Tania M. Barone
  • Josha van Houdt
  • Rachel Bezanson
  • Caroline M. S. Straatman
  • Camilla Pacifici
  • Adam Muzzin
  • Anna Gallazzi
  • Vivienne Wild
  • David Sobral
  • Eric F. Bell
  • Stefano Zibetti
  • Lamiya Mowla
  • Marijn Franx
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<mark>Journal publication date</mark>1/09/2020
<mark>Journal</mark>Monthly Notices of the Royal Astronomical Society
Issue number1
Volume497
Number of pages6
Pages (from-to)389–404
Publication StatusPublished
Early online date16/07/20
<mark>Original language</mark>English

Abstract

We use deep, spatially resolved spectroscopy from the Large Early Galaxy Astrophysics Census Survey to study radial variations in the stellar population of 17 spectroscopically selected post-starburst (PSB) galaxies. We use spectral fitting to measure two Lick indices, H δA and Fe 4383 , and find that, on average, PSB galaxies have radially decreasing H δA and increasing Fe 4383  profiles. In contrast, a control sample of quiescent, non-PSB galaxies in the same mass range shows outwardly increasing H δA and decreasing Fe 4383 . The observed gradients are weak (≈−0.2 Å/Re), mainly due to seeing convolution. A two-SSP (simple stellar population) model suggests that intrinsic gradients are as strong as observed in local PSB galaxies (≈−0.8 Å/Re). We interpret these results in terms of inside-out growth (for the bulk of the quiescent population) versus star formation occurring last in the centre (for PSB galaxies). At z ≈ 0.8, central starbursts are often the result of gas-rich mergers, as evidenced by the high fraction of PSB galaxies with disturbed morphologies and tidal features (40 per cent). Our results provide additional evidence for multiple paths to quiescence: a standard path, associated with inside-out disc formation and with gradually decreasing star formation activity, without fundamental structural transformation, and a fast path, associated with centrally concentrated starbursts, leaving an inverse age gradient and smaller half-light radius.

Bibliographic note

This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Francesco D’Eugenio, Arjen van der Wel, Po-Feng Wu (吳柏锋), Tania M Barone, Josha van Houdt, Rachel Bezanson, Caroline M S Straatman, Camilla Pacifici, Adam Muzzin, Anna Gallazzi, Vivienne Wild, David Sobral, Eric F Bell, Stefano Zibetti, Lamiya Mowla, Marijn Franx, Inverse stellar population age gradients of post-starburst galaxies at z = 0.8 with LEGA-C, Monthly Notices of the Royal Astronomical Society, Volume 497, Issue 1, September 2020, Pages 389–404, is available online at: https://academic.oup.com/mnras/article-abstract/497/1/389/5872492