Jets From Young Stars

Jochen Eislöffel
LOFAR and the Transient Radio Sky, Amsterdam, December 2008

Transcript

1. TLS Tautenburg – 12. Dec 2008
2. TLS Tautenburg – 12. Dec 2008
3. Jets From Young Stars Jochen Eislöffel Thüringer Landessternwarte Tautenburg
4. Accretion/ejection: from AGN central engines to brown dwarfs operates over ten orders of magnitude of mass of central object!
5. Formation and collimation of a jet by rotating magnetosphere
6. Disks and Jets of Young Stars
7. Understanding the central engine Blandford & Payne 1982 Camenzind 1990 Wardle & Königl 1993 Ferreira & Pelletier 1993, 1995 Casse & Ferreira 2000a,b Disk winds X-winds Stellar winds Parker 1958 Weber & Davis 1967 Hartmann & McGregor 1982 Lago 1984 Sauty & Tsinganos 1994, 2000 Shu et al. 1994 Shang et al. 2002 Lovelace et al. 1995,1999 Fendt & Elstner 2000
8. Evolutionary scheme of star formation Jet adapted from Feigelson & Montmerle, ARA&A, 1999
9. Formation and collimation of a jet by rotating magnetosphere
10. Jet rotation: DG Tau S2 S6 0."4 ~ 90 AU ~30 AU
11. An HST survey for jet rotation radial velocity asymmetries: 10-30 km/s Coffey et al. 2004, 2007
12. Properties of the accretion/ejection structure foot point radius ~ 0.1 – 3 AU BN/Bp ~ 4 – 8 Angular momentum extracted from disk: 60 - 100% Bacciotti et al. 2002, Anderson et al. 2003, Coffey et al. 2004, Pesenti et al. 2004, Woitas et al. 2005
13. Non-thermal radio jets Curiel et al. 1993 Ray et al. 1997
14. DG Tau X-ray jet 0.6-1.7 keV ACIS-S: DG Tau + jets Smoothed Colour-coded Guedel et al. 2008
15. L1551 IRS5 X-ray jet L1551 IRS5 PSF source 2005 Chandra 2001 Favata et al. 2006
16. L1551 IRS5 X-ray and optical jet Bonito et al. 2008
17. L1551 IRS5 jet - motion Bonito et al. 2008
18. Correlation between accretion and mass outflow accretion rate from veiling mass outflow rate from HVC ejection efficiency: Mwind/Macc ~ 1% Hartigan, Edwards, Ghandour 1995
19. Optical variability of S CrA Forbrich et al. 2008
20. cm- variability in the LkHa101 cluster Osten and Wolk 2008