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Sökning: WFRF:(Binney James) > (2019) > The GALAH survey an...

The GALAH survey and Gaia DR2 : dissecting the stellar disc's phase space by age, action, chemistry, and location

Bland-Hawthorn, Joss (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia;Univ Calif Berkeley, Miller Inst, Berkeley, CA 94720 USA
Sharma, Sanjib (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia
Tepper-Garcia, Thor (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia
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Binney, James (författare)
Clarendon Lab, Rudolf Peierls Ctr Theoret Phys, Oxford OX1 3PU, England
Freeman, Ken C. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Hayden, Michael R. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia
Kos, Janez (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
De Silva, Gayandhi M. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
Ellis, Simon (författare)
Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
Lewis, Geraint F. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
Asplund, Martin (författare)
Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Buder, Sven (författare)
MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany;Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, Germany
Casey, Andrew R. (författare)
Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia;Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia
D'Orazi, Valentina (författare)
INAF Astron Observ Padova, I-36012 Asiago, Italy
Duong, Ly (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Khanna, Shourya (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia
Lin, Jane (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Lind, Karin (författare)
Uppsala universitet,Teoretisk astrofysik,Observationell astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany
Martell, Sarah L. (författare)
Ctr Excellence Astrophys Three Dimens ASTRO 3D, Hawthorn, Vic, Australia;UNSW, Sch Phys, Sydney, NSW 2052, Australia
Ness, Melissa K. (författare)
Columbia Univ, Dept Astron, Pupin Phys Labs, New York, NY 10027 USA;Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA
Simpson, Jeffrey D. (författare)
UNSW, Sch Phys, Sydney, NSW 2052, Australia
Zucker, Daniel B. (författare)
Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
Zwitter, Tomaz (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Kafle, Prajwal R. (författare)
Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia
Quillen, Alice C. (författare)
Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
Ting, Yuan-Sen (författare)
Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA;Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA
Wyse, Rosemary F. G. (författare)
Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
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 (creator_code:org_t)
2019-01-22
2019
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 486:1, s. 1167-1191
Relaterad länk:
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • We use the second data releases of the European Space Agency Gaia astrometric survey and the high-resolution Galactic Archaeology with HERMES (GALAH) spectroscopic survey to analyse the structure of our Galaxy's disc components. With GALAH, we separate the alpha-rich and alpha-poor discs (with respect to Fe), which are superposed in both position and velocity space, and examine their distributions in action space. We study the distribution of stars in the zV(z) phase plane, for both V-phi and V-R, and recover the remarkable 'phase spiral' discovered by Gaia. We identify the anticipated quadrupole signature in zV(z) of a tilted velocity ellipsoid for stars above and belowtheGalactic plane. By connecting ourwork with earlier studies, we show that the phase spiral is likely to extend well beyond the narrow solar neighbourhood cylinder in which it was found. The phase spiral is a signature of corrugated waves that propagate through the disc, and the associated non-equilibrium phase mixing. The radially asymmetric distribution of stars involved in the phase spiral reveals that the corrugation, which is mostly confined to the alpha-poor disc, grows in z-amplitude with increasing radius. We present new simulations of tidal disturbance of the Galactic disc by the Sagittarius (Sgr) dwarf. The effect on the zV(z) phase plane lasts greater than or similar to 2 Gyr, but a subsequent disc crossing wipes out the coherent structure. We find that the phase spiral was excited less than or similar to 0.5 Gyr ago by an object like Sgr with total mass similar to 3 x 10(10) M-circle dot (stripped down from similar to 5 x 10(10) M-circle dot when it first entered the halo) passing through the plane.

Ämnesord

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

Nyckelord

astrometry
proper motions
stars: kinematics and dynamics
Galaxy: disc
evolution
structure

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