Herschel-SPIRE spectroscopy of G29.96-0.02: fitting the full SED

Kirk, J. M.; Polehampton, E.; Anderson, L. D.; Baluteau, J.-P.; Bontemps, S.; Joblin, C.; Jones, S. C.; Naylor, D. A.; Ward-Thompson, D.; White, G. J.; Abergel, A.; Ade, P.; André, P.; Arab, H.; Bernard, J.-P.; Blagrave, K.; Boulanger, F.; Cohen, M.; Compiegne, M.; Cox, P.; Dartois, E.; Davis, G.; Emery, R.; Fulton, T.; Gry, C.; Habart, E.; Huang, M.; Lagache, G.; Lim, T.; Madden, S.; Makiwa, G.; Martin, P.; Miville-Deschênes, M.-A.; Molinari, S.; Moseley, H.; Motte, F.; Okumura, K.; Pinheiro Gonçalves, D.; Rodón, J. A.; Russeil, D.; Saraceno, P.; Sidher, S.; Spencer, L.; Swinyard, B. and Zavagno, A. (2010). Herschel-SPIRE spectroscopy of G29.96-0.02: fitting the full SED. Astronomy & Astrophysics, 518, article no. L82.

DOI: https://doi.org/10.1051/0004-6361/201014625

Abstract

We use the SPIRE Fourier-transform spectrometer (FTS) on-board the ESA Herschel Space Observatory to analyse the submillimetre spectrum of the Ultra-compact HII region G29.96-0.02. Spectral lines from species including ¹³CO, CO, [CI], and [NII] are detected. A sparse map of the [NII] emission shows at least one other HII region neighbouring the clump containing the UCHII. The FTS spectra are combined with ISO SWS and LWS spectra and fluxes from the literature to present a detailed spectrum of the source spanning three orders of magnitude in wavelength. The quality of the spectrum longwards of 100μm allows us to fit a single temperature greybody with temperature 80.3±0.6K and dust emissivity index 1.73±0.02, an accuracy rarely obtained with previous instruments.We estimate a mass of 1500 M_⊙ for the clump containing the HII region. The clump's bolometeric luminosity of 4 x 10⁶ L_⊙ is comparable to, or slightly greater than, the known O-star powering the UCHII region.

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