Watching New Stars Form

1. Watching New Stars Form Alyssa A. Goodman Harvard University Department of Astronomy cfa-www.harvard.edu/~agoodman

2. "Cores" and Outflows 1 pc = 3 lyr Molecular or Dark Clouds Jets and Disks Solar System Formation What we (think we) understand

4. Outflow from Dying Star Young Star Cluster Stellar Nurseries Nebulosity/Glowing Gas The Cycle of Star Birth & Death

5. Outflow from Dying Star Young Star Cluster Stellar Nurseries Nebulosity/Glowing Gas The Cycle of Star Birth & Death

6. 100 mm Dust Emission in Cassiopeia Tóth et al. 1995 Some Molecular Clouds "Created" by Supernovae

7. "Cores" and Outflows 1 pc = 3 lyr Molecular or Dark Clouds Jets and Disks Solar System Formation What we (think we) understand

9. Magnetohydrodynamic Waves Infall Outflows MHD Turbulence Thermal Motions What we also understand, but don’t always admit SNe/GRB H II Regions

10. “Dust, Not Holes”

11. Time Showed Barnard was Right! Barnard’s Optical Photograph of Ophiuchus IRAS Satellite Observation, 1983 Remember: Cold (10K) dust glows, like a blackbody, in the far-infrared.

12. Night Vision

13. Dust, not Holes The Oschin telescope, 48-inch aperture wide-field Schmidt camera at Palomar Red Plate, Digitized Palomar Observatory Sky Survey

14. Tutorial:Velocity from Spectroscopy Observed Spectrum Telescope  Spectrometer 1.5 1.0 Intensity 0.5 0.0 -0.5 All thanks toDoppler 100 150 200 250 300 350 400 "Velocity"

15. Tutorial:Velocity from Spectroscopy Observed Spectrum Telescope  Spectrometer 1.5 1.0 Intensity 0.5 0.0 -0.5 All thanks toDoppler 100 150 200 250 300 350 400 "Velocity"

16. My Main Line of Work: Radio Spectral-line Observations of Interstellar Clouds

17. The 1000-ft Telescope at Arecibo, PR

18. Radio Spectral-line Observations of Interstellar Clouds Radio Spectral-Line Survey Alves, Lada & Lada 1999

19. Velocity as a "Fourth" Dimension Loss of 1 dimension No loss of information

20. “Integrated Intensity Map” Region of Radio Spectral-Line Survey Alves, Lada & Lada 1999

21. 1957 H I Spectroscopy Telescope  Spectrometer H I Spectrum of the Galaxy M51 from Agassiz Station,Heeschen 1957 All thanks toDoppler

22. 1950 1960 1970 1980 1990 2000 8 10 4 10 7 10 N 6 channels, 10 channels 3 10 *N N 5 10 channels pixels S/N in 1 hour, 2 10 4 10 (S/N)*N N 3 10 1 N 10 pixels pixels 2 10 0 10 1950 1960 1970 1980 1990 2000 Year Learning More from “Too Much” Data Product S/N

23. Magnetohydrodynamic Waves Infall Outflows MHD Turbulence Thermal Motions The Dynamic Star-FormingInterstellar Medium SNe/GRB H II Regions

24. “Giant” Herbig-Haro Flows:PV Ceph 1 pc Reipurth, Bally & Devine 1997

25. A New Proposal: Episodic ejections from precessing or wobbling moving source Required motion of 0.25 pc (e.g. 2 km s-1 for 125,000 yr)

26. 67:55 H H 3 1 5 C H H 3 1 5 B 67:50 H H 3 1 5 A H H 4 1 5 HH 215P2 ) 0 HH 215P1 5 9 1 ( PV Cephei d 67:45 HH 315D H H 3 1 5 E 67:40 H H 3 1 5 F 20:46 20:45 ( 1 9 5 0 ) a PV Ceph 12CO (2-1) OTF Map from NRAO 12-m Red: 3.0 to 6.9 km s-1 Blue: -3.5 to 0.4 km s-1 Arce & Goodman 2001

27. NASA’s Origins Program

28. More Questions? • cfa-www.harvard.edu/~agoodman