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  • Duong, L.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)

The GALAH survey : properties of the Galactic disc(s) in the solar neighbourhood

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-02-27
  • OXFORD UNIV PRESS,2018
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-357390
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-357390URI
  • https://doi.org/10.1093/mnras/sty525DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Using data from the GALAH pilot survey, we determine properties of the Galactic thin and thick discs near the solar neighbourhood. The data cover a small range of Galactocentric radius (7.9 less than or similar to R-GC less than or similar to 9.5 kpc), but extend up to 4 kpc in height from the Galactic plane, and several kpc in the direction of Galactic anti-rotation (at longitude 260 degrees <= l <= 280 degrees). This allows us to reliably measure the vertical density and abundance profiles of the chemically and kinematically defined 'thick' and 'thin' discs of the Galaxy. The thin disc (low-alpha population) exhibits a steep negative vertical metallicity gradient, at d[M/H]/dz = -0.18 +/- 0.01 dex kpc(-1), which is broadly consistent with previous studies. In contrast, its vertical alpha-abundance profile is almost flat, with a gradient of d[alpha/M]/dz = 0.008 +/- 0.002 dex kpc(-1). The steep vertical metallicity gradient of the low-a population is in agreement with models where radial migration has a major role in the evolution of the thin disc. The thick disc (high-alpha population) has a weaker vertical metallicity gradient d[M/H]/dz = -0.058 +/- 0.003 dex kpc(-1). The aabundance of the thick disc is nearly constant with height, d[alpha/M]/dz = 0.007 +/- 0.002 dex kpc(-1). The negative gradient in metallicity and the small gradient in [alpha/M] indicate that the high-alpha population experienced a settling phase, but also formed prior to the onset of major Type I alpha supernova enrichment. We explore the implications of the distinct alpha-enrichments and narrow [alpha/M] range of the sub-populations in the context of thick disc formation.

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Added entries (persons, corporate bodies, meetings, titles ...)

  • Freeman, K. C.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Asplund, M.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Casagrande, L.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Buder, S.Max Planck Inst Astron, Koenigstuhl 17, D-69117 Heidelberg, Germany (author)
  • Lind, KarinUppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Heidelberg, Germany(Swepub:uu)karli488 (author)
  • Ness, M.Max Planck Inst Astron, Koenigstuhl 17, D-69117 Heidelberg, Germany (author)
  • Bland-Hawthorn, J.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia (author)
  • De Silva, G. M.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia;Australian Astron Observ, N Ryde, NSW 1670, Australia (author)
  • D'Orazi, V.INAF, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy (author)
  • Kos, J.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia (author)
  • Lewis, G. F.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia (author)
  • Lin, J.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Martell, S. L.Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia (author)
  • Schlesinger, K.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Sharma, S.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia (author)
  • Simpson, J. D.Australian Astron Observ, N Ryde, NSW 1670, Australia (author)
  • Zucker, D. B.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia (author)
  • Zwitter, T.Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (author)
  • Anguiano, B.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA (author)
  • Da Costa, G. S.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (author)
  • Hyde, E.Western Sydney Univ, Locked Bag 1797, Penrith, NSW 1797, Australia (author)
  • Horner, J.Univ Southern Queensland, Toowoomba, Qld 4350, Australia (author)
  • Kafle, P. R.Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia (author)
  • Nataf, D. M.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (author)
  • Reid, W.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Western Sydney Univ, Locked Bag 1797, Penrith, NSW 2751, Australia;Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark (author)
  • Stello, D.Univ Sydney, Sch Phys A28, Sydney Inst Astron, Sydney, NSW 2006, Australia;Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA (author)
  • Ting, Y. -S (author)
  • Wyse, R. F. G.Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (author)
  • Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, AustraliaMax Planck Inst Astron, Koenigstuhl 17, D-69117 Heidelberg, Germany (creator_code:org_t)

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  • In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS476:4, s. 5216-52320035-87111365-2966

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