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Sökning: id:"swepub:oai:DiVA.org:su-195253" > Exploring the Galax...

Exploring the Galaxy's halo and very metal-weak thick disc with SkyMapper and Gaia DR2

Cordoni, G. (författare)
Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy.;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Da Costa, G. S. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.
Yong, D. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.
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Amarsi, Anish (författare)
Uppsala universitet,Teoretisk astrofysik,Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy.
Marino, A. F. (författare)
Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy.;Ist Nazl Fis Nucl, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy.,MIT, Dept Phys, Cambridge, MA 02139 USA.;MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
Monty, S. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Nordlander, T. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.
Norris, J. E. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Asplund, M. (författare)
Bessell, M. S. (författare)
Casey, A. R. (författare)
Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia.;Monash Univ, Fac Informat Technol, Wellington Rd, Clayton, Vic 3800, Australia.
Frebel, A. (författare)
Lind, Karin (författare)
Stockholms universitet,Institutionen för astronomi,Stockholm Univ, Dept Astron, Roslagstullbacken 21, SE-10691 Stockholm, Sweden.
Murphy, S. J. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;Univ New South Wales, Sch Sci, Canberra, ACT 2600, Australia.
Schmidt, B. P. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Gao, X. D. (författare)
Max Planck Inst Astron, Konigstuhl 12, D-69117 Heidelberg, Germany.
Xylakis-Dornbusch, T. (författare)
Max Planck Inst Astron, Konigstuhl 12, D-69117 Heidelberg, Germany.;Heidelberg Univ, Landessternwarte, Konigstuhl 12, D-69117 Heidelberg, Germany.
Amarsi, A. M. (författare)
Milone, A. P. (författare)
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Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia. Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia. (creator_code:org_t)
2020-11-04
2021
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 503:2, s. 2539-2561
Relaterad länk:
http://arxiv.org/pdf...
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https://urn.kb.se/re...
https://doi.org/10.1...
https://urn.kb.se/re...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • In this work, we combine spectroscopic information from the SkyMapper survey for Extremely Metal-Poor stars and astrometry from Gaia DR2 to investigate the kinematics of a sample of 475 stars with a metallicity range of -6.5 <= [Fe/H] <= -2.05 dex. Exploiting the action map, we identify 16 and 40 stars dynamically consistent with the Gaia Sausage and Gaia Sequoia accretion events, respectively. The most metal poor of these candidates have metallicities of [Fe/H] = - 3.31 and - 3.74, respectively, helping to define the low-metallicity tail of the progenitors involved in the accretion events. We also find, consistent with other studies, that similar to 21 per cent of the sample have orbits that remain confined to within 3 kpc of the Galactic plane, that is, |Z(max)| <= 3 kpc. Of particular interest is a subsample (similar to 11 per cent of the total) of low |Z(max)| stars with low eccentricities and prograde motions. The lowest metallicity of these stars has [Fe/H] = -4.30 and the subsample is best interpreted as the very low-metallicity tail of the metal-weak thick disc population. The low |Z(max)|, low eccentricity stars with retrograde orbits are likely accreted, while the low |Z(max)|, high eccentricity pro- and retrograde stars are plausibly associated with the Gaia Sausage system. We find that a small fraction of our sample (similar to 4 per cent of the total) is likely escaping from the Galaxy, and postulate that these stars have gained energy from gravitational interactions that occur when infalling dwarf galaxies are tidally disrupted.

Ämnesord

NATURVETENSKAP  -- Fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences (hsv//eng)
NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

stars: kinematics and dynamics
Galaxy: disc
Galaxy: formation
Galaxy: halo
Galaxy: kinematics and dynamics
Galaxy: structure

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