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Titolo:
On the lack of cold dust in IRAS P09104+4109 and IRAS F15307+3252: their spectral energy distributions and implications for finding dusty AGNs at high redshift
Autore:
Deane, JR; Trentham, N;
Indirizzi:
Univ London Queen Mary & Westfield Coll, Dept Phys, London E1 4NS, EnglandUniv London Queen Mary & Westfield Coll London England E1 4NS S, England Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England Univ Cambridge Cambridge England CB3 0HA ron, Cambridge CB3 0HA, England
Titolo Testata:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 4, volume: 326, anno: 2001,
pagine: 1467 - 1474
SICI:
0035-8711(20011001)326:4<1467:OTLOCD>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRALUMINOUS INFRARED GALAXIES; CENTRAL CLUSTER GALAXIES; RADIO-QUIET QUASARS; X-RAY-EMISSION; STAR-FORMATION; COOLING-FLOW; APM 08279+5255; HIDDEN QUASAR; FIELD; IRAS-09104+4109;
Keywords:
galaxies : individual : IRAS F15307+3252; galaxies : individual : IRAS P09104+4109-quasars : general; cosmology : observations; infrared : galaxies; submillimetre;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
77
Recensione:
Indirizzi per estratti:
Indirizzo: Deane, JR Univ London Queen Mary & Westfield Coll, Dept Phys, Mile End Rd,London E14NS, England Univ London Queen Mary & Westfield Coll Mile End Rd London England E1 4NS
Citazione:
J.R. Deane e N. Trentham, "On the lack of cold dust in IRAS P09104+4109 and IRAS F15307+3252: their spectral energy distributions and implications for finding dusty AGNs at high redshift", M NOT R AST, 326(4), 2001, pp. 1467-1474

Abstract

We present upper limits on the 850-mum and 450-mum fluxes of the warm hyperluminous (bolometric luminosity L-bol > 10(13) L-.) galaxies IRAS P09104+4109 (z = 0.442) and IRAS F15307+3252 (z = 0.926), derived from measurementsusing the SCUBA bolometer array on the James Clerk Maxwell Telescope. Hot luminous infrared sources like these are thought to differ from more normalcold ultraluminous infrared (L-bol > 10(12) L-.) galaxies in that they derive most of their bolometric luminosities from dusty active galactic nuclei(AGNs) as opposed to starbursts. Such hot, dusty AGNs at high redshift arethought to be responsible for much of the mass accretion of the Universe that is in turn responsible for the formation of the supermassive black holes seen in the centres of local galaxies. The galaxy IRAS P09104+4109 is also unusual in that it is a cD galaxy in the centre of a substantial cooling-flow cluster, not an isolated interacting galaxy like most ultraluminous infrared galaxies. Previously it was known to have large amounts of hot (T > 50 K) dust from IRAS observations. We now show that the contribution of cold dust to the bolometric luminosity is less than 3 per cent. Most ultraluminous infrared galaxies possess large amounts of cold dust, and it is now known that some cooling-flow cluster cD galaxies do as well. Yet this object,which is an extreme example of both, does not have enough cold gas to contribute significantly to the bolometric luminosity. We outline physical reasons why this could have happened. We then provide a discussion of strategies for finding hot dusty AGNs, given the limitations on submillimetre surveys implied by this work.

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Documento generato il 21/09/18 alle ore 07:38:28