new stellar streams found in sdss dr7 张昊彤 zhang haotong [email protected] 2010. 7
TRANSCRIPT
New stellar streams found in SDSS Dr7
张昊彤Zhang Haotong
Matched filter
• Rockosi et. al,2002
Grillmair , 2009
Matched filter
Matched filter
Matched filter1.5
Matched filter2.0
Matched filter2.5
Matched filter3.0
Matched filter3.5
Matched filter4.0
Steams found by Matched filter
Pal5 22d, Grillmair 2006NGC5546, Grillmair 2006GD1, Grillmair 2006Orphan, Grillmair 2006Anticenter or Monoceros , Grillmail 2006
Streams found by mached filter
Grillmair 2009
Streams found by matched filter
Ibata 2007
Something old
Pal5Rockosi 2002
Grillmair 2006
Odenkirchen, 2009
pal5
• Dehnen, W et.al. 2004• Odenkirchen, M. et al.2009• Quillen, A. et al. 2010
Pal5
2.0 mag Deeper than M13
Pal5
Pal5
Pal5
Δr=1.9+-0.17Δr=2.2+-0.21Δr=2.05+-0.31
Orphan
Grillmair 2006
Belokurov, 2007
Orphan
Newberg, 2010
Fellhauer, M, et .al. 2007Jin, Shoko, Lynden-bell,D., 2007Sales,L., et al. 2008Newberg,H., et al, 2010
Orphan3.5 mag Deeper than M13
Orphan(l,b) ~ (160,45)
Orphan
Orphan
Orphan
Newberg et.al 2010
Orphan
Orphan
Orp
han
Orphan
Orphan
ΔM~0.6
Orphan
Orphan
Orphan
Orphan
Orphan
Orphan
Orphan
Something maybe new
GD1 related
Willett, 2009
GD1 Related
0.75 mag deeper
GD1 related
GD1 here ~8.8+-0.8 Kpc, willet 2009
GD1 related
D~9.4 +-0.6kpc 9.4+-0.8kpcD~7.7 +-0.8kpc ?
GD1 Related
Grillmair 2006
Something new
Ob2~46° Ob1~25° Ob3~24°
Ob1 ~16.8kpc Ob2~13.1Kpc Ob3~11.7kpc
Spec
tra
in O
b3
Proper motion
ob2
Proper motion
ob2
Proper motion
ob3
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.
Thank you