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Titolo:
The contribution of faint blue galaxies to the submillimetre counts and background
Autore:
Busswell, GS; Shanks, T;
Indirizzi:
Univ Durham, Dept Phys, Sci Labs, Durham DH1 3LE, England Univ Durham Durham England DH1 3LE ys, Sci Labs, Durham DH1 3LE, England
Titolo Testata:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
fascicolo: 1, volume: 323, anno: 2001,
pagine: 67 - 74
SICI:
0035-8711(20010501)323:1<67:TCOFBG>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRAVIOLET LUMINOSITY DENSITY; CLERK-MAXWELL-TELESCOPE; STAR-FORMATION RATE; HUBBLE DEEP FIELD; HIGH-REDSHIFT; STARBURST GALAXIES; INFRARED-EMISSION; DUST; EVOLUTION; COBE;
Keywords:
galaxies : evolution; galaxies : spiral; infrared : galaxies; submillimetre; ultraviolet : galaxies;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Busswell, GS Univ Durham, Dept Phys, Sci Labs, South Rd, Durham DH1 3LE, England Univ Durham South Rd Durham England DH1 3LE DH1 3LE, England
Citazione:
G.S. Busswell e T. Shanks, "The contribution of faint blue galaxies to the submillimetre counts and background", M NOT R AST, 323(1), 2001, pp. 67-74

Abstract

Observations in the submillimetre (submm) waveband have recently revealed a new population of luminous sources. These are proposed to lie at high redshift and to be optically faint because of their high intrinsic dust obscuration. The presence of dust has been previously invoked in optical galaxy count models which use the Bruzual & Chariot evolution models with an exponential tau = 9 Gyr star formation rate (SFR) for spirals, and these fit the count data well from U to K. We now show that by using either a 1/lambda orCalzetti absorption law for the dust and re-distributing the evolved spiral galaxy ultraviolet (UV) radiation into the far-infrared (FIR), these models can account for all of the 'faint' (less than or equal to1 mJy) 850-mum galaxy counts, but fail to fit 'bright' (greater than or equal to2 mJy) sources, indicating that another explanation for the submm counts may apply atbrighter fluxes, e.g., quasi-stellar objects (QSOs) or ultraluminous infrared galaxies (ULIRGs). We find that the main contribution to the faint, submm number counts is in the redshift range 0.5 < z < 3, peaking at z = 1.8. The above model, using either dust law, can also explain a significant proportion of the extragalactic background at 850 mum, as well as producing a reasonable fit to the bright 60-mum IRAS counts.

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Documento generato il 25/06/18 alle ore 17:14:26