Utilizza questo identificativo per citare o creare un link a questo documento:
http://hdl.handle.net/20.500.12386/27889
Titolo: | Very extended cold gas, star formation and outflows in the halo of a bright quasar at z > 6 | Autori: | CICONE, CLAUDIA Maiolino, R. Gallerani, S. Neri, R. Ferrara, A. Sturm, E. FIORE, Fabrizio PICONCELLI, Enrico Feruglio, C. |
Data pubblicazione: | 2015 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 574 | Da pagina:: | A14 | Abstract: | Past observations of quasar host galaxies at z> 6 have found cold gas and star formation on compact scales of a few kiloparsecs. We present new high sensitivity IRAM Plateau de Bure Interferometer follow-up observations of the [C ii] 158 μm emission line and far-infrared (FIR) continuum in the host galaxy of <ASTROBJ>SDSS J1148+5251</ASTROBJ>, a luminous quasar at redshift 6.4189. We find that a large portion of the gas traced by [C ii] is at high velocities, up to ~1400 km s<SUP>-1</SUP>relative to the systemic velocity, confirming the presence of a major outflow as indicated by previous observations. The outflow has a complex morphology and reaches a maximum projected radius of ≃30 kpc. The extreme spatial extent of the outflow allows us, for the first time in an external galaxy, to estimate mass-loss rate, kinetic power, and momentum rate of the outflow as a function of the projected distance from the nucleus and the dynamical time scale. These trends reveal multiple outflow events during the past 100 Myr, although the bulk of the mass, energy, and momentum appear to have been released more recently within the past ~20 Myr. Surprisingly, we discover that the quiescent gas at systemic velocity is also extremely extended. More specifically, we find that, while 30% of the [C ii] within v ∈(-200, 200) km s<SUP>-1</SUP> traces a compact component that is not resolved by our observations, 70% of the [C ii] emission in this velocity range is extended with a projected full width at half maximum (FWHM) size of 17.4 ± 1.4 kpc. We detect FIR continuum emission associated with both the compact and the extended [C ii] components, although the extended FIR emission has a FWHM of 11 ± 3 kpc, thus smaller than the extended [C ii] source. Overall, our results indicate that the cold gas traced by [C ii] is distributed up to r ~ 30 kpc in the host galaxy of SDSS J1148+5251. A large amount of extended [C ii] is likely to be associated with star formation occurring on large scales, but the [C ii] source extends well beyond the FIR continuum, and additional multi-wavelength observations are needed in order to clarify the origin of this very extended [C ii] . <P />Appendices are available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201424980/olm">http://www.aanda.org | Acknowledgments: | We thank the referee, Carlos De Breuck, for providing constructive comments that have significantly helped to improve the paper. We also thank Rosa Valiante and Christian Leipski for useful discussion. C.C. acknowledges support by the Isaac Newton Studentship and by STFC funding. This work is based on observations carried out with the IRAM Plateau de Bure Interferometer. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). In this paper we use the IDL SED fitting code developed by Caitlin M. Casey ( Casey 2012 ). | URI: | http://hdl.handle.net/20.500.12386/27889 | URL: | https://www.aanda.org/articles/aa/abs/2015/02/aa24980-14/aa24980-14.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201424980 | Bibcode ADS: | 2015A&A...574A..14C | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
File in questo documento:
File | Descrizione | Dimensioni | Formato | |
---|---|---|---|---|
aa24980-14.pdf | Pdf editoriale | 4.4 MB | Adobe PDF | Visualizza/apri |
Page view(s)
38
controllato il 19-apr-2024
Download(s)
11
controllato il 19-apr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Tutti i documenti in DSpace sono pubblicati ad Accesso Aperto, salvo diversa indicazione per alcuni documenti specifici.