Gas and dust on HII regions as seen by Herschel

1. Gas and dust on HII regions as seen by Herschel Javier A. Rodón Laboratoired’Astrophysique de Marseille Loren Anderson, Jean-Paul Baluteau, Annie Zavagnoand the “HOBYS” and “Evolution of Interstellar Dust” consortia Gas and dust in HII as seen by Herschel Javier A. Rodón

2. Herschel 160, 250, 500 mm The HII Regions Sh2 104 RCW 120 d ~ 4 kpc D ~ 11 pc d ~ 1.3 kpc • D ~ 4 pc Gas and dust in HII as seen by Herschel Javier A. Rodón

3. b – Tdust Relationship Sh2 104 RCW 120 • Aperture photometry in selected regions • SEDs fitted to derive (b,Tdust) Rodón et al. 2010 Anderson et al. 2010 • Mean b higher in RCW 120 • Two different groups • Anticorrelation between b and Tdust Gas and dust in HII as seen by Herschel Javier A. Rodón

4. SPIRE Spectroscopy Sh2 104 Gas and dust in HII as seen by Herschel Javier A. Rodón

5. SPIRE Spectroscopy RCW 120 Gas and dust in HII as seen by Herschel Javier A. Rodón

6. SPIRE Spectroscopy Sh2 104 RCW 120 • Relatively warm gas, different temperatures • Temperature stratification? • Similar temperatures • Rather isothermal medium? Gas and dust in HII as seen by Herschel Javier A. Rodón

7. Summary • Herschel opens the ~100 – 700 mm FIR window for the first time. • SPIRE takes that whole range simultaneously. • Long CO-ladders observed, ideal for density and temperature structure modeling. • CO appears optically thick up to mid- J-levels, while 13CO is most likely optically thin. • Slight variation of dust temperature throughout the regions • Anti-correlation between dust temperature and b recovered. Evidence of different dust properties? Ongoing work • Modeling the PDR at different SPIRE pointings in the regions. • Isolating spectra of single sources to merge with the HI-GAL catalogue. Gas and dust in HII as seen by Herschel Javier A. Rodón