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Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008

INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE. Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008. “Evolution of YSOs”. Goals Establish an evolutionary sequence for Massive YSOs SED shapes, bolometric luminosities and temperatures Synergy with IRDCs and Molecular Clouds

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Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008

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  1. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 “Evolution of YSOs” • Goals • Establish an evolutionary sequence for Massive YSOs • SED shapes, bolometric luminosities and temperatures • Synergy with IRDCs and Molecular Clouds • Derive the timeline for the massive star formation phases • Invert object counts in the various phases • Measure the Star Formation Rate across the Galaxy • Synergy with Global Galactic SF SWG3: Evolution of Young Stellar Objects 1

  2. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Methods & Tools • Source Classification Tools • SEDs automatic building from Hi-GAL and ancillary data (ATLASGAL, Bolocam, JPS, GLIMPSE, MIPSGAL) • Distances and luminosities, mainly kinematical distances • SED model grids and (Lbol,Tbol) diagnostics • Automatic source Classification (expert systems?) • Pathfinder Samples • Start developing the tools on samples of well characterized objects • IRDCs, warm cores/protostars, Hot Cores, well characterized HII • Massive complementary mm and radio spectroscopy program to provide ancillary data • Distances and Bolometric Luminosities • Kinematic (mols & HI), association with known sources, maser parallaxes SWG3: Evolution of Young Stellar Objects 2

  3. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Source Classification: Example IRAS 23385+6053 IRAS 20126+4104 Hot Core Very Young High Mass Star Warm Core Accreting Protostar? • Tracers: Warm Dust, Cold Dust, Free-Free • Key: Identify sources in various evolutionary stages in complex regions SWG3: Evolution of Young Stellar Objects 3

  4. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Source Classification: Example IRAS 23385+6053 IRAS 20126+4104 Hot Core Very Young High Mass Star Warm Core Accreting Protostar? • Tracers: Warm Dust, Cold Dust, Free-Free • Key: Identify sources in various evolutionary stages in complex regions SWG3: Evolution of Young Stellar Objects 4

  5. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Source Classification: Example IRAS 23385+6053 IRAS 20126+4104 Hot Core Very Young High Mass Star Warm Core Accreting Protostar? • Tracers: Warm Dust, Cold Dust, Free-Free • Key: Identify sources in various evolutionary stages in complex regions SWG3: Evolution of Young Stellar Objects 5

  6. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE LIRAS=2 104 LO 3 103 LO<< LIRAS 104 LO= LIRAS Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Source Classification: Example IRAS 23385+6053 IRAS 20126+4104 Hot Core Very Young High Mass Star Warm Core Accreting Protostar? • Tracers: Warm Dust, Cold Dust, Free-Free • Key: Identify sources in various evolutionary stages in complex regions SWG3: Evolution of Young Stellar Objects 6

  7. INAF IFSI IRA OAFI OACT UNIRM1 UNIRM2 UNILE Riunione Avanzamento 1 ASI – Roma 11 Novembre 2008 Diagnostic Diagram: Example • The bolometric luminosity and the circumstellar mass are important age indicators for YSOs. • Sources in different evolutionary stages occupy different regions in a Lbol-Menv diagram. • Simple models reproduce (Molinari et al. 2008) the YSOs evolutionary path from pre-ZAMS (Class 0) through UCHII (Class I) to Ae-Be (Class II). SWG3: Evolution of Young Stellar Objects 7

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