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Título:
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K-s number counts in the Groth and Coppi fields
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Autores:
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Cristobal Hornillos, David ;
Balcells, Marc ;
Prieto, Mercedes ;
Guzmán, Rafael ;
Gallego Maestro, Jesús ;
Cardiel López, Nicolás ;
Serrano, Ángel ;
Pello, Roser
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Tipo de documento:
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texto impreso
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Editorial:
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Univ. Chicago Press, 2003-09-20
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Tipo = Artículo
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Resumen:
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We have used William Herschel Telescope/INGRID K_(s) images on two high-latitude fields, the Coppi and Groth strips, to obtain galaxy number counts over ~ 180 arcmin^(2), to a depth of K_(s) ~ 21:0. Detection efficiency corrections as a function of object size have been calculated on each pointing. We have used a signalto-noise threshold in two complementary half-exposure images to remove spurious detections. Our data cover the range from K_(s) = 14.5 to K_(s) = 21.0, so they are useful for investigating a previously reported change in the number count slope (d log N/dm) at K ~ 17. We find a slope ?_(b)= 0:54- 0:63 for K 17.5. A total contribution from galaxies to the extragalactic background light (EBL) in the K band of ?I_(?)=10.5 nW m^(-2) sr^(-1) has been calculated. This K-band EBL coming from galaxies accounts for only ~50% of the recent measurements of the diffuse EBL. Standard number count models fail to reproduce the observed slope change at K ~ 17.5 unless elliptical and spiral formation is pushed to z??2.
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En línea:
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https://eprints.ucm.es/60178/1/cardiel49libre.pdf
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