Bibcode
Planck Collaboration; Arnaud, M.; Atrio-Barandela, F.; Aumont, J.; Baccigalupi, C.; Banday, A. J.; Barreiro, R. B.; Battaner, E.; Benabed, K.; Benoit-Lévy, A.; Bernard, J.-P.; Bersanelli, M.; Bielewicz, P.; Bonaldi, A.; Bond, J. R.; Borrill, J.; Bouchet, F. R.; Buemi, C. S.; Burigana, C.; Cardoso, J.-F.; Casassus, S.; Catalano, A.; Cerrigone, L.; Chamballu, A.; Chiang, H. C.; Colombi, S.; Colombo, L. P. L.; Couchot, F.; Crill, B. P.; Curto, A.; Cuttaia, F.; Davies, R. D.; Davis, R. J.; de Bernardis, P.; de Rosa, A.; de Zotti, G.; Delabrouille, J.; Dickinson, C.; Diego, J. M.; Donzelli, S.; Doré, O.; Dupac, X.; Enßlin, T. A.; Eriksen, H. K.; Finelli, F.; Frailis, M.; Franceschi, E.; Galeotta, S.; Ganga, K.; Giard, M.; González-Nuevo, J.; Górski, K. M.; Gregorio, A.; Gruppuso, A.; Hansen, F. K.; Harrison, D. L.; Hildebrandt, S. R.; Hivon, E.; Holmes, W. A.; Hora, J. L.; Hornstrup, A.; Hovest, W.; Huffenberger, K. M.; Jaffe, T. R.; Jones, W. C.; Juvela, M.; Keihänen, E.; Keskitalo, R.; Kisner, T. S.; Knoche, J.; Kunz, M.; Kurki-Suonio, H.; Lähteenmäki, A.; Lamarre, J.-M.; Lasenby, A.; Lawrence, C. R.; Leonardi, R.; Leto, P.; Lilje, P. B.; Linden-Vørnle, M.; López-Caniego, M.; Macías-Pérez, J. F.; Maffei, B.; Maino, D.; Mandolesi, N.; Martin, P. G.; Masi, S.; Massardi, M.; Matarrese, S.; Mazzotta, P.; Mendes, L.; Mennella, A.; Migliaccio, M.; Miville-Deschênes, M.-A.; Moneti, A.; Montier, L.; Morgante, G.; Mortlock, D.; Munshi, D.; Murphy, J. A. et al.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 573, id.A6, 17 pp.
Fecha de publicación:
1
2015
Revista
Número de citas
14
Número de citas referidas
14
Descripción
Late stages of stellar evolution are characterized by copious mass-loss
events whose signature is the formation of circumstellar envelopes
(CSE). Planck multi-frequency measurements have provided relevant
information on a sample of Galactic planetary nebulae (PNe) in the
important and relatively unexplored observational band between 30 and
857 GHz. Planck enables the assembly of comprehensive PNe spectral
energy distributions (SEDs) from radio to far-IR frequencies. Modelling
the derived SEDs provides us with information on physical properties of
CSEs and the mass content of both main components: ionized gas, traced
by the free-free emission at cm-mm waves; and thermal dust, traced by
the millimetre and far-IR emission. In particular, the amount of ionized
gas and dust has been derived here. Such quantities have also been
estimated for the very young PN CRL 618, where the strong variability
observed in its radio and millimetre emission has previously prevented
constructing its SED. A morphological study of the Helix Nebula was also
performed. Planck maps reveal, for the first time, the spatial
distribution of the dust inside the envelope, allowing us to identify
different components, the most interesting of which is a very extended
component (up to 1 pc) that may be related to a region where the slow
expanding envelope is interacting with the surrounding interstellar
medium.
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Rafael
Rebolo López