New stellar streams found in SDSS Dr7 张昊彤 Zhang Haotong zht@lamost.org 2010. 7

New stellar streams found in SDSS Dr7

张昊彤Zhang Haotong

zht@lamost.org2010. 7

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