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The GALAH survey :
The GALAH survey : stellar streams and how stellar velocity distributions vary with Galactic longitude, hemisphere, and metallicity
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- Quillen, Alice C. (författare)
- Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA
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- De Silva, Gayandhi (författare)
- Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia;Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
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- Sharma, Sanjib (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
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- Hayden, Michael (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Australian Res Council, Ctr Excellence All Sky Astrophys Dimens 3 ASTRO 3, Canberra, ACT 72611, Australia
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- Freeman, Ken (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Bland-Hawthorn, Joss (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia;Univ Calif Berkeley, Dept Astron, Campbell Hall, Berkeley, CA 94720 USA;Australian Res Council, Ctr Excellence All Sky Astrophys Dimens 3 ASTRO 3, Canberra, ACT 72611, Australia
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- Zerjal, Marusa (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Asplund, Martin (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia;Australian Res Council, Ctr Excellence All Sky Astrophys Dimens 3 ASTRO 3, Canberra, ACT 72611, Australia
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- Buder, Sven (författare)
- Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- D'Orazi, Valentina (författare)
- Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy
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- Duong, Ly (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Kos, Janez (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
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- Lin, Jane (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
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- Martell, Sarah (författare)
- Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
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- Schlesinger, Katharine (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Simpson, Jeffrey D. (författare)
- Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia
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- Zucker, Daniel B. (författare)
- Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia
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- Zwitter, Tomaz (författare)
- Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
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- Anguiano, Borja (författare)
- Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA;Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
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- Carollo, Daniela (författare)
- Ist Nazl Astrofis, Via Osservatorio 20, I-10025 Pino Torinese, Italy;Australian Res Council, Ctr Excellence All Sky Astrophys Dimens 3 ASTRO 3, Canberra, ACT 72611, Australia
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- Casagrande, Luca (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Cotar, Klemen (författare)
- Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
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- Cottrell, Peter L. (författare)
- Univ Canterbury, Sch Phys & Chem Sci, Christchurch 8140, New Zealand;Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800, Australia
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- Ireland, Michael (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 72611, Australia
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- Kafle, Prajwal R. (författare)
- Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia
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- Horner, Jonathan (författare)
- Univ Southern Queensland, Div Res & Innovat, Toowoomba, Qld 4350, Australia
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- Lewis, Geraint F. (författare)
- Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia
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- Nataf, David M. (författare)
- Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
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- Ting, Yuan-Sen (författare)
- Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA;Inst Adv Study, Princeton, NJ 08540 USA
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- Watson, Fred (författare)
- Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia
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- Wittenmyer, Rob (författare)
- Univ New South Wales, Australian Ctr Astrobiol, Sydney, NSW 2052, Australia;Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia
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- Wyse, Rosemary (författare)
- Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
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(creator_code:org_t)
- 2018-04-05
- 2018
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 478:1, s. 228-254
- Relaterad länk:
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http://eprints.usq.e...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Using GALAH (GALactic Archaeology with HERMES) survey data of nearby stars, we look at how structure in the planar (u, v) velocity distribution depends on metallicity and on viewing direction within the Galaxy. In nearby stars with distance d less than or similar to 1 kpc, the Hercules stream is most strongly seen in higher metallicity stars [Fe/H] > 0.2. The Hercules stream peak v value depends on viewed galactic longitude, which we interpret as due to the gap between the stellar stream and more circular orbits being associated with a specific angular momentum value of about 16.40 km s(-1) kpc. The association of the gap with a particular angular momentum value supports a bar resonant model for the Hercules stream. Moving groups previously identified in Hipparcos (High Precision Parallax COllecting Satellite) observations are easiest to see in stars nearer than 250 pc, and their visibility and peak velocities in the velocity distributions depends on both viewing direction (galactic longitude and hemisphere) and metallicity. We infer that there is fine structure in local velocity distributions that varies over distances of a few hundred pc in the Galaxy.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: disc
- Galaxy: evolution
- Galaxy: kinematics and dynamics
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Till lärosätets databas
- Av författaren/redakt...
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Quillen, Alice C ...
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De Silva, Gayand ...
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Sharma, Sanjib
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Hayden, Michael
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Freeman, Ken
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Bland-Hawthorn, ...
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visa fler...
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Zerjal, Marusa
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Asplund, Martin
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Buder, Sven
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D'Orazi, Valenti ...
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Duong, Ly
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Kos, Janez
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Lin, Jane
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Lind, Karin
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Martell, Sarah
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Schlesinger, Kat ...
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Simpson, Jeffrey ...
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Zucker, Daniel B ...
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Zwitter, Tomaz
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Anguiano, Borja
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Carollo, Daniela
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Casagrande, Luca
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Cotar, Klemen
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Cottrell, Peter ...
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Ireland, Michael
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Kafle, Prajwal R ...
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Horner, Jonathan
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Lewis, Geraint F ...
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Nataf, David M.
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Ting, Yuan-Sen
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Watson, Fred
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Wittenmyer, Rob
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Wyse, Rosemary
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