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Rodrigo Parra John Conway Ylva Pihlstrom

Rodrigo Parra John Conway Ylva Pihlstrom. Roadmap. Diffuse + Compact Two phase gas??. Clumpy medium?. Formalism. Proposed model. Monte Carlo. 50 pc. 50 pc. IIIZw35. Single dish ( Staveley-Smith et al . 1986) VLBA ( Trotter et al . 1997) G. VLBI ( Diamond et al . 1999)

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Rodrigo Parra John Conway Ylva Pihlstrom

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  1. Rodrigo Parra John Conway Ylva Pihlstrom

  2. Roadmap Diffuse + Compact Two phase gas?? Clumpy medium? Formalism Proposed model Monte Carlo

  3. 50 pc 50 pc IIIZw35 • Single dish (Staveley-Smith et al. 1986) • VLBA (Trotter et al. 1997) • G. VLBI (Diamond et al. 1999) • EVN + MERLIN (Pihlström et al. 2001)

  4. Free-free absorption cone Continuum Ring OH Ring Model

  5. Mean number of clumps in the radial direction 2 1 Expected number of clumps. Path length

  6. We have 36 Realizations of a Poisson process The expected maximum Number of clumps is: 302 52 Truncated series G. VLBI 5 mas 30 mas EVN + MERLIN

  7. Restriction Solving the equations

  8. Solutions A2 = 12 A1 = 72 0 P1 > 500 

  9. Monte-Carlo simulations

  10. Results - Continuum Pihlström et al., 2001 EVN + MERLIN 33.0 x 28.7 mas Simulation 30 x 30 mas

  11. Results - Spectrum Staveley Smith et al., 1986 Trotter et al., 1997 Single dish (JBT) Simulation

  12. Results - OH maser emissionEVN + MERLIN Pihlström et al., 2001 EVN + MERLIN 33.0 x 28.7 mas Simulation 30 x 30 mas

  13. 5 pc Trotter et al., 1997 Results - OH maser emissionVLBI

  14. Arp 220 ? Lonsdale et al., 1998

  15. Conclusions + Future The model reproduces both, the compact and smooth components of the maser emission, without the need of a two-phase gas. The concept of statistical gain is an accurate representation of clumpy media. Application of the model to other sources (ie. Arp 220, Mrk 273) Improve the model: Line widths, coherence, beaming

  16. Thank you!

  17. Remnant Radio emission Starburst Ring Answers 50pc Ionised Thermal wind • -Inward Propagating starburst Ring • Gas clouds in ring not bound • - Orbital/random velocity of 50km/s at r=25pc, enclosed mass is 10E8 solar masses Quiescient Disk

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