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NGC7538-IRS1 N: modelling a maser disc

NGC7538-IRS1 N: modelling a maser disc. Michele Pestalozzi, M. Elitzur, J. Conway, R. Booth. Discs in high-mass star-forming regions. Zhang et al. 1998 Cesaroni et al. 2000 Shepherd et al. 2001 Sandell et a l. 2003. NGC7538-IRS1N: “the” disc. 6.7 GHz. Pestalozzi et al. 2004.

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NGC7538-IRS1 N: modelling a maser disc

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  1. NGC7538-IRS1 N:modelling a maser disc Michele Pestalozzi, M. Elitzur, J. Conway, R. Booth European Workshop on Astronomical Molecules, Zwolle 2004

  2. Discs in high-mass star-forming regions • Zhang et al. 1998 • Cesaroni et al. 2000 • Shepherd et al. 2001 • Sandell et al. 2003 European Workshop on Astronomical Molecules, Zwolle 2004

  3. NGC7538-IRS1N: “the” disc 6.7 GHz Pestalozzi et al. 2004 Minier et al. 1998 Gaume et al. 1995 European Workshop on Astronomical Molecules, Zwolle 2004

  4. The data disp. / LOS Vel. Pestalozzi et al. 2001 Minier et al. 1998 R.A. / DEC European Workshop on Astronomical Molecules, Zwolle 2004

  5. Comparison 6.7 / 12.2 GHz European Workshop on Astronomical Molecules, Zwolle 2004

  6. Keplerian rotating disc seen edge-on Gain per unit length between R0 and Ri: power-law (1 / rp) Amplification of a continuum background (Tb ~ 104K) 4. Maser is unsaturated Assumptions: Geometry European Workshop on Astronomical Molecules, Zwolle 2004

  7. Model (3.) (1.) (2.,4.) Free parameters: h, W European Workshop on Astronomical Molecules, Zwolle 2004

  8. Results 30 M8 (from others) 1000 AU in radius h = 0.39 6.7 GHz 12.2 GHz European Workshop on Astronomical Molecules, Zwolle 2004

  9. Velocity Coherence The ‘kink’ European Workshop on Astronomical Molecules, Zwolle 2004

  10. Important note IRAM 04191+1522 PdB, CS Belloche et al.2002 European Workshop on Astronomical Molecules, Zwolle 2004

  11. Advantages: • Masers allow to resolve the • same linear scales further away • 1 AU @ 1 kpc • Fine tracers of dynamics MASER vs Thermal emission European Workshop on Astronomical Molecules, Zwolle 2004

  12. Found and modelled a disc in NGC7538 30 M8, 1000 AU radius, h=0.39 Masers behave as thermal emission regarding optical depth Optimal tool to study small linear and dynamical scales at large distances Future: 3D modelling, outliers, satellite lines... Summary European Workshop on Astronomical Molecules, Zwolle 2004

  13. Thank you European Workshop on Astronomical Molecules, Zwolle 2004

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