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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/33175
DC FieldValueLanguage
dc.contributor.authorSARACCO, Paoloen_US
dc.contributor.authorD'Odorico, S.en_US
dc.contributor.authorMoorwood, A.en_US
dc.contributor.authorBUZZONI, Albertoen_US
dc.contributor.authorCuby, J. -G.en_US
dc.contributor.authorLidman, C.en_US
dc.date.accessioned2023-02-06T13:21:20Z-
dc.date.available2023-02-06T13:21:20Z-
dc.date.issued1999en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/20.500.12386/33175-
dc.description.abstractWe present J and Ks band galaxy counts down to J=24 and Ks=22.5 obtained with the new infrared imager/spectrometer, SOFI, at the ESO New Technology Telescope. The co-addition of short, dithered, images led to a total exposure time of 256 and 624 minutes respectively, over an area of ~ 20 arcmin(2) centered on the NTT Deep Field. The total number of sources with S/N>5 is 1569 in the J sample and 1025 in the Ks-selected sample. These are the largest samples currently available at these depths. A dlogN/dm relation with slope of ~ 0.36 in J and ~ 0.38 in Ks is found with no evident sign of a decline at the magnitude limit. The observed surface density of ``small'' sources is much lower than ``large'' ones at bright magnitudes and rises more steeply than the large sources to fainter magnitudes. Fainter than J ~ 22.5 and Ks ~ 21.5, small sources dominate the number counts. Galaxies get redder in J-K down to J ~ 20 and Ks ~ 19. At fainter magnitudes, the median color becomes bluer with an accompanying increase in the compactness of the galaxies. We show that the blue, small sources which dominate the faint IR counts are not compatible with a high redshift (z>1) population. On the contrary, the observed color and compactness trends, together with the absence of a turnover at faint magnitudes and the dominance of small sources, can be naturally explained by an increasing contribution of sub-L(*) galaxies when going to fainter apparent magnitudes. Such evidence strongly supports the existence of a steeply rising (alpha <<-1) faint end of the local infrared luminosity function of galaxies - at least for luminosities L<0.01L(*) . Based on observations collected at the European Southern Observatory, La Silla, Chileen_US
dc.language.isoengen_US
dc.titleIR colors and sizes of faint galaxiesen_US
dc.typeArticle-
dc.identifier.urlhttps://ui.adsabs.harvard.edu/abs/1999A%26A...349..751S/abstracten_US
dc.relation.mediumSTAMPAen_US
dc.relation.volume349en_US
dc.relation.firstpage751en_US
dc.type.refereeREF_1en_US
dc.relation.journalASTRONOMY & ASTROPHYSICSen_US
dc.type.miur262 Articolo in rivista-
dc.identifier.adsbibcode1999A&A...349..751Sen_US
dc.description.apcnoen_US
dc.description.oa1 – prodotto con file in versione Open Access (allegare il file al passo  5-Carica)en_US
item.grantfulltextopen-
item.languageiso639-1en-
item.fulltextWith Fulltext-
item.openairetypeArticle-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.cerifentitytypePublications-
crisitem.journal.journalissn0004-6361-
crisitem.journal.anceE016240-
crisitem.author.deptO.A. Brera-
crisitem.author.deptOAS Bologna-
crisitem.author.orcid0000-0003-3959-2595-
crisitem.author.orcid0000-0002-6514-1870-
Appears in Collections:1.01 Articoli in rivista
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