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New stellar streams found in SDSS Dr7
张昊彤Zhang Haotong
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Matched filter
• Rockosi et. al,2002
Grillmair , 2009
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Matched filter
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Matched filter
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Matched filter1.5
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Matched filter2.0
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Matched filter2.5
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Matched filter3.0
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Matched filter3.5
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Matched filter4.0
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Steams found by Matched filter
Pal5 22d, Grillmair 2006NGC5546, Grillmair 2006GD1, Grillmair 2006Orphan, Grillmair 2006Anticenter or Monoceros , Grillmail 2006
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Streams found by mached filter
Grillmair 2009
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Streams found by matched filter
Ibata 2007
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Something old
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Pal5Rockosi 2002
Grillmair 2006
Odenkirchen, 2009
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pal5
• Dehnen, W et.al. 2004• Odenkirchen, M. et al.2009• Quillen, A. et al. 2010
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Pal5
2.0 mag Deeper than M13
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Pal5
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Pal5
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Pal5
Δr=1.9+-0.17Δr=2.2+-0.21Δr=2.05+-0.31
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Orphan
Grillmair 2006
Belokurov, 2007
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Orphan
Newberg, 2010
Fellhauer, M, et .al. 2007Jin, Shoko, Lynden-bell,D., 2007Sales,L., et al. 2008Newberg,H., et al, 2010
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Orphan3.5 mag Deeper than M13
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Orphan(l,b) ~ (160,45)
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Orphan
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Orphan
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Orphan
Newberg et.al 2010
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Orphan
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Orphan
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Orp
han
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Orphan
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Orphan
ΔM~0.6
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Orphan
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Orphan
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Orphan
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Orphan
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Orphan
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Orphan
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Orphan
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Something maybe new
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GD1 related
Willett, 2009
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GD1 Related
0.75 mag deeper
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GD1 related
GD1 here ~8.8+-0.8 Kpc, willet 2009
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GD1 related
D~9.4 +-0.6kpc 9.4+-0.8kpcD~7.7 +-0.8kpc ?
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GD1 Related
Grillmair 2006
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Something new
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Ob2~46° Ob1~25° Ob3~24°
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Ob1 ~16.8kpc Ob2~13.1Kpc Ob3~11.7kpc
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Spec
tra
in O
b3
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Proper motion
ob2
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Proper motion
ob2
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Proper motion
ob3
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conclusions
• New extension found for Orphan & Pal5• Found a stream may go across gd1 • Found 3 other faint streams more than 10Kpc• Some of them maybe wrong• No Extra information from Spectra and proper
motion found for those faint Streams.• More powerful telescope to explore their
kinematic information.
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Thank you