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Disk Origin Triand A disk origin for inner stellar halo structures around the Milky Way Adrian Price-Whelan (Princeton University) ! adrn " adrianprw Kathryn Johnston, Allyson Sheffield, Chervin Laporte, Maria Bergemann, Branimir Sesar, Ting Li, Chris Hayes, Steve Majewski, Rachael Beaton, Judy Cohen, Andy Tzanidakis Streams vs. “structures” Grillmair & Carlin 2016 Streams vs. “structures” C. Slater Streams vs. “structures” Eastern Banded Monoceros, Structure (EBS) Anticenter Stream (ACS) Triangulum-Andromeda (TriAnd) C. Slater “Structures” / clouds / shells Anticenter Stream (ACS) d ~ 8 kpc Eastern Banded Structure (EBS) d ~ 10 kpc Monoceros / Giant Anticenter Stellar Stream d ~ 8–12 kpc (GASS) / Low Latitude Stream (LLS) Triangulum-Andromeda d ~ 15–30 kpc A13 d ~ 12–15 kpc Hercules-Aquila cloud d ~ 10–20 kpc Virgo over-density d ~ 6–20 kpc Eridanus-Phoenix d ~ 16 kpc (heliocentric) Accreted debris? Kicked out of disk? D. Hendel A. Tzanidakis & C. Laporte Accreted debris? Kicked out of disk? D. Hendel A. Tzanidakis & C. Laporte the Triangulum-Andromeda region the Triangulum-Andromeda region “Annoying Milky Way Foreground” 20 i 22 24 0 1 2 g − i Martin+2007 “Annoying Milky Way Foreground” Monoceros 20 i 22 Triand 1 & 2 d⊙ ∼ 20 − 30 kpc 24 0 1 2 g − i Martin+2007 As an accretion event: Size + metallicity of TriAnd would imply ≳Sgr-mass progenitor Triand 1 Triand 2 -2 -1.5 -1 -0.5 0 0.5 [Fe/H] Sheffield+2014 Sagittarius dsph metallicity distribution (RGB stars) APOGEE survey RR Lyrae from Catalina Sky Survey TriAnd P>0.8 M-giants 150 P 0.8 100 ] 1 − 50 0 [km s 50 GSR − v 100 − 150 − (M-giants) M-giants 150 (RR Lyrae) RR Lyrae 100 ] 1 − 50 0 [km s 50 GSR − v 100 − 150 − 160 150 140 130 120 110 100 10 25 40 l [deg] N Price-Whelan+2015 Monoceros & A13 RR Lyrae from Catalina Sky Survey A13 Monoceros/GASS TriAnd Sheffield, Price-Whelan+2018 TriAnd, Monoceros, A13 have many K/M giants, few (if any) RR Lyrae: suggests a stellar population unlike any of the dwarf satellites of the Milky Way The Milky Way disk is metal rich: few RR Lyrae, many K/M giants - could these features have originated in the disk? but…very far from disk Johnston, Price-Whelan+2017 Detailed chemistry of A13 & TriAnd Bergemann,…,Price-Whelan+2018 0.5 0.0 [Na/Fe] -0.5 -1 -3 -2 -1 0 1 [Fe/H] Bergemann,…,Price-Whelan+2018 Outer disk open clusters 0.5 0.0 MW disk [Na/Fe] -0.5 -1 -3 -2 -1 0 1 [Fe/H] Bergemann,…,Price-Whelan+2018 Outer disk open clusters 0.5 0.0 MW disk [Na/Fe] -0.5 Sgr Fornax -1 -3 -2 -1 0 1 [Fe/H] Bergemann,…,Price-Whelan+2018 Outer disk open clusters 0.5 TriAnd / A13 0.0 MW disk [Na/Fe] -0.5 Sgr Fornax -1 -3 -2 -1 0 1 [Fe/H] Bergemann,…,Price-Whelan+2018 3D kinematics with Gaia TriAnd stars Rotating with the disk, slightly slower than solar circular velocity −1 σvR = σvz = 25 km s −1 |v¯ϕ | = 185 km s −1 σvϕ ≈ 50 km s Summary Summary Many of the “structures” identified as streams, clouds, or halo over- densities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk Disk Accretion Eastern Banded Structure (EBS) Hercules-Aquila Anticenter Stream (ACS) Eri-Phoenix (?) Monoceros / GASS Virgo (?) TriAnd A13 Disk Accretion Talk by Chervin Laporte Eastern Banded Structure (EBS) Hercules-Aquila Anticenter Stream (ACS) Eri-Phoenix (?) Monoceros / GASS Virgo (?) TriAnd A13 This talk Summary Many of the “structures” identified as streams, clouds, or halo over- densities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk These stars could have been “kicked out” as a result of interactions with Sagittarius and the LMC Laporte+2017 Summary Many of the “structures” identified as streams, clouds, or halo over- densities are associated with or originate from the Galactic disk, but now at extreme radii/heights above disk These stars could have been “kicked out” as a result of interactions with Sagittarius and the LMC These features are tracers of dark matter in the outer disk, and will constrain interaction history of the Milky Way and Sagittarius Some relevant work: Newberg+2002 Martin+2007, 2014 Sheffield, Johnston+2014 Xu, Newberg+2015 Price-Whelan, Johnston, Sheffield+2015 Li, Sheffield+2017 Laporte+2017 Johnston, Price-Whelan+2017 Bergemann, Sesar+2018 Sheffield, Price-Whelan+2018 Hayes+2018 Extra slides TriAnd Sgr LMC SMC Kirby+2013 Kirby+2013 K/M Giants RR Lyrae 0.8 0.4 [Mg/Fe] 0.0 -0.4 -3 -2 -1 0 1 [Fe/H] Bergemann,…,Price-Whelan+2018 Bergemann,…,Price-Whelan+2018.
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