Young Star Caught Speeding

Alyssa A. GoodmanHarvard-Smithsonian Center for Astrophysics

Héctor G. ArceCaltech

Star & Planet Formation

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Galaxy

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Star Cluster

Molecular Cloud Complex

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Star-Forming “Globule”

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Extrasolar SystemDisk + Jet

How fast is “22 km/s”?

45,000 miles per hour (45 x a speeding bullet)

10-20 times faster than “most” stars move

Most stars

Velocity compared to local environment

3 km/s

PV Ceph!

22 km/s

Exiled, but Accepted in New Land

““Homeland”Homeland”

““NewNewLand”Land”

Ocean of Ocean of EmptinessEmptinessNGC 7023NGC 7023

PV CephPV Ceph

Coming SoonPV Ceph: The Movie

3 lig

ht

years

Goodm

an &

Arce

2004

, Figu

re 1

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Stanke, McCaughrean & Zinnecker, 1999

What’s an “HH knot”?HH knots far from sourcemark the ends of bipolar

“jets” or “outflows”

Coming SoonPV Ceph: The Movie

3 lig

ht

years

Goodm

an &

Arce

2004

, Figu

re 1

Simulated Formation of a Star Cluster

Bate, Bonnell & Bromm 2002

QuickTime™ and aSorenson Video decompressorare needed to see this picture.

Dust Emission MapDust Emission Map

Goodman & Arce 2004

NGC 7023PV Ceph

Optical Image of NGC 7023

Tom Licha, 2002

Young StarCaught

Speeding Away from

Home

“Exit wound”

“Immigration” Happens

This discovery was a surprise.

Underage stars can run away from home, fast!

A proper “speeding study” is needed to understand what stars formed where,

as a function of time.

NGC 7023PV Ceph

Dust Emission MapDust Emission Map

Goodman & Arce 2004

Young StarYoung StarCaughtCaughtSpeeding Away Speeding Away from Homefrom Home

First Evidence for a Young Star moving

at such High Speed far from a Cluster

Speed=22 km/sAge=0.5 million years

gap

Optical Image of NGC 7023

Tom Licha, 2002

NGC 7023PV Ceph

Dust Emission MapDust Emission Map

Goodman & Arce 2004

Young StarYoung StarCaughtCaughtSpeeding Away Speeding Away from Homefrom Home

gap

Optical Image of NGC 7023

Tom Licha, 2002

Deceleration of Jets

First Evidence for a Young Star moving

at such High Speed far from a Cluster

Speed=22 km/sAge=0.5 million years

Variability in “Gyulbudaghain's Nebula”

(the fuzz surrounding PV Ceph)

July ‘98 Oct/Nov ‘98 Oct ‘00

In 1 year, PV Ceph moves about the distance from the Sun to Jupiter (5 A.U.)