department of physics and astronomy rice university
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Department of Physics and Astronomy Rice University. Stromfest April 4, 2008. Patrick Hartigan. History The Reflection Nebula Hypothesis Subsequent Development of Field. Evolving Ideas About HH Objects. New Stuff Conditions near the Star MHD far from the star. DISCOVERY!. - PowerPoint PPT PresentationTRANSCRIPT
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Department of Physics and Astronomy
Rice University
Evolving Ideas About HH Objects
Patrick Hartigan Stromfest April 4, 2008
History• The Reflection Nebula Hypothesis• Subsequent Development of Field
New Stuff• Conditions near the Star• MHD far from the star
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Herbig 1951, ApJ 113 697
Haro 1952, ApJ 115 572
Ambarzumian, 1954 Comm. Burakan Obs No 13Argues these are related to young stars – coins term HH object
DISCOVERY!
Emission lines… Photoionized… but where is the blue star?
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What Causes the Emission Lines?
1956 ApJ 123 379
High ionization, low temperature:“The most obvious means of explaining the ionization is to
assume a strong radiation field in the far-ultraviolet”
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HH Objects as Reflection Nebulae ApJ 191, 111, 1974
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They are polarized! ApJ 191, L93, 1974
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But Wait, Emission Lines Unpolarized ApJ 234, L191, 1979
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What went wrong?
Examples can be more complex:
Hartigan et al 1999
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What went right?
• Model made TESTABLE PREDICTIONS (i.e. it could be proved wrong)
• Motivated future work
• There are reflection nebulae in these objects
• HH Objects are displaced from host stars
• HH Objects are usually not photoionized nebulae
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Spectra, Supersonic Velocities Imply Shocks Schwartz 1975Large Linewidths Imply Bow Shocks Schwartz 1978Proper Motions Imply “Bullets” Herbig and Jones 1981UV Spectra Confirm Shocks Bohm et al 1981 Ortolani and D’Odorico 1980
Bow Shock Models Hartmann & Raymond 1984 Raga & Bohm 1985 Hartigan etal 1987
Jet Connection Mundt & Fried 1983Bow Shock/Mach Disk Hartigan 1989 Reipurth & Heathcote 1992
Physical Conditions in Jets Brugel, Bohm Mannery 1981 Hartigan et al 1994 Bacciotti & Eisloffel 1998 Nisini 2005HST Proper Motions Reipurth, Bally, Hartigan etc. 1996-2007
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Tilting Filter ImagesApJS 62, 39, 1986
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Close to the source: Slit Mapping, Image Slicers
Lavalley et al 1997, A&A 327, 671 Jet is fastest along the axis
Bacciotti et al 2000, ApJ 537, L49 …and gets denser close to the star
Coffey et al 2004, ApJ 604, 758 … and may even be rotating
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NEW RESULTS1. Near the Source2. Far From the Source
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Physical Conditions Throughout the Jet
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Jet Collimation
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RW AURKeck, NIRSPAO [Fe II] 1.64 Slit=0.068” (9.6 AU)
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Linewidths
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Spectroastrometry
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NEW RESULTS1. Near the Source2. Far From the Source
Scaled Laser Experiments
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Brugel, Bohm and Mannery 1981
No single density or temperature describes HH objects Filling factor is low