View
213
Download
0
Tags:
Embed Size (px)
Citation preview
A Survey of Velocity Features in Perseus
Michelle BorkinSenior Thesis Presentation
May 12, 2006
A Survey of Velocity Features in Perseus
Visualize 12CO data cube in 3D Slicer
Mark high velocity points in 3D space, and export to astronomical software
Identify outflows and calculate statistics
Star (and Planet) Formation As We Understand It
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
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”
“Giant” Outflows
H. Arce’s Thesis 2001
Greyscale shows ambient 1000 ptcl/cc gas
Red shows 100 ptcl/cc gas moving away from us
Blue shows 100 ptcl/cc gas moving toward us
VLSR = 3.4 km/s
3.4 km/s
VLSR = 3.6 km/s
VLSR = 3.8 km/s
VLSR = 4.0 km/s
VLSR = 4.2 km/s
VLSR = 4.4 km/s
VLSR = 4.6 km/s
VLSR = 4.8 km/s
VLSR = 5.0 km/s
VLSR = 5.2 km/s
VLSR = 5.4 km/s
VLSR = 5.6 km/s
VLSR = 5.8 km/s
VLSR = 6.0 km/s
VLSR = 6.2 km/s
VLSR = 6.4 km/s
VLSR = 6.6 km/s
VLSR = 6.8 km/s
VLSR = 7.0 km/s
VLSR = 7.2 km/s
VLSR = 7.4 km/s
VLSR = 7.6 km/s
VLSR = 7.8 km/s
VLSR = 8.0 km/s
VLSR = 8.2 km/s
VLSR = 8.4 km/s
VLSR = 8.6 km/s
VLSR = 8.8 km/s
8.8 km/s
Barnard’s Perseus
QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.
COMPLETE/FCRAO W(13CO)
“Giant” Outflows
H. Arce’s Thesis 2001
Greyscale shows ambient 1000 ptcl/cc gas
Red shows 100 ptcl/cc gas moving away from us
Blue shows 100 ptcl/cc gas moving toward us
Spectral Line Outflow Mapping
Usually…
In Extreme Cases… 1.0
0.8
0.6
0.4
0.2
0.0 120100806040200
1.0
0.8
0.6
0.4
0.2
0.0120100806040200 120 100 80 60 40200
1.0
0.8
0.6
0.4
0.2
0.0120 100806040200
Molecular Cloud
Outflows
Note: not drawn to scale.
Star forming core
~ 1pc
HH knots
Outflow lobes
Circumstellar envelope
Circumstellar disc
Protostar
HH jet
Based on H. Arce Thesis 2001.
3D Slicer
3D Slicer
A Survey of Velocity Features in Perseus
Visualize 12CO data cube in 3D Slicer
Mark high velocity points in 3D space, and export to astronomical software
Identify outflows and calculate statistics
Outflow Identification
Red Shifted points
Blue Shifted points
HH Objects
SCF points
IRAS Sources
Known Outflow Sources
I
II
III IV V
VI
New outflows Known outflows or outflow regions
Outflow Identification
Red Shifted points
Blue Shifted points
HH Objects
SCF points IRAS Sources
Known Outflow Sourcesc2d Sources
B5
RA
DE
C
B5
Velocity
DE
C
B5 Results
Summation of all the spectra in Region 1
Summation of the spectra associated with outflows
Summation of all the spectra associated with previously known outflows
Gaussian fit
Region 1 (B5)
B5 ResultsSummation of all the spectra in Region 1
All outflows
previously detected outflows
Gaussian fit
High velocity gasHigh velocity gas from detected outflows
Results and Conclusions
• 216 high velocity points were identified across Perseus
• In the three regions cataloged, 20 new outflows were found
• 1 new shell was found spanning Regions 5 and 6 (across L1448 and NGC 1333)
• Known outflows do not account for all of the observed high velocity gas.
Future Research
Red Shifted points
Blue Shifted points
HH Objects
SCF points
IRAS Sources
Known Outflow Sources
Finish cataloging
Calculate outflow statistics
Questions?
For more information, go to:
http://www.cfa.harvard.edu/COMPLETE/
http://www.cfa.harvard.edu/COMPLETE/astromed/
http://iic.harvard.edu