PV Ceph: Young Star Caught Speeding?

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PV Ceph: Young Star Caught Speeding? Alyssa A. Goodman Harvard-Smithsonian Center for Astrophysics Héctor G. Arce Caltech Begin by telling the whole story through using just this title slide, with no visuals We noticed star moving much faster than “normal” In fact, “speeding” Piqued our interest Investigated where it came from Surprised to learn it came from very far away “Ejected” from its homeland (of political unrest) managed to find a new life in a new land It is important to figure out if this happens often--this is the first time it’s been seen Are we seeing immigration on a cosmic scale? We need to understand how often this happens in order to properly model star formation in the Universe

“Preponderance of the Evidence” 3 light years “Preponderance of the Evidence” Geometry of the “HH” knots Morphology of Molecular Outflow & Star-Forming “Blob” “Wiggle” of the Jet Orientation: North is rotated 117 degrees clockwise from the vertical Goodman & Arce 2004 Figure 1 PV Ceph: The Movie

Simulated Formation of a Star Cluster Christine will get me time scale Bate, Bonnell & Bromm 2002

Ejected!? Optical Image of NGC 7023 Dust Emission Map NGC 7023 PV Ceph Tom Licha, 2002 Dust Emission Map Goodman & Arce 2004 NGC 7023 PV Ceph “Exit wound” Ejected!?

How often does this happen? Direct Proper Motion RW Aur 16 km s-1, Jones & Herbig 1979 BN object w.r.t. “I” 50 km s-1, Plambeck et al. 1995 IRAS 16293-2422 30 km s-1, Loinard 2002 T-Tau Sb 20 km s-1, Loinard et al. 2003 Deduced from Outflow Morphology B5 IRS1~10 km s-1, Bally et al. 1996* Jets in NGC 1333 & Orion clusters ~10 km s-1,Bally & Reipurth 2001* PV Ceph 20 km s-1, Goodman & Arce 2004 New measurements say no See Furlan et al. 2003? *but the possibility of motion was dismissed, or not emphasized!

Young Star Caught Speeding Away from Home gap Optical Image of NGC 7023 Tom Licha, 2002 First Evidence for a Young Star moving at such High Speed far from a Cluster NGC 7023 PV Ceph Dust Emission Map Young Star Caught Speeding Away from Home Speed=22 km/s Age=0.5 million years Goodman & Arce 2004