The European Large Area ISO Survey II: mid-infrared extragalactic source counts

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dc.creatorSerjeant, S.
dc.creatorOliver, S.
dc.creatorRowan-Robinson, M.
dc.creatorCrockett, H.
dc.creatorMisoulis, V.
dc.creatorSumner, T.
dc.creatorGruppioni, C.
dc.creatorMann, R. G.
dc.creatorEaton, N.
dc.creatorElbaz, D.
dc.creatorClements, D. L.
dc.creatorBaker, A.
dc.creatorEfstathiou, A.
dc.creatorCesarsky, C.
dc.creatorDanese, L.
dc.creatorFranceschini, A.
dc.creatorGenzel, R.
dc.creatorLawrence, A.
dc.creatorLemke, D.
dc.creatorMcMahon, R. G.
dc.creatorMiley, G.
dc.creatorPuget, J. -L.
dc.creatorRocca-Volmerange, B.
dc.date2000-03-14
dc.date.accessioned2026-07-07T10:47:13Z
dc.date.available2026-07-07T10:47:13Z
dc.descriptionWe present preliminary source counts at 6.7um and 15um from the Preliminary Analysis of the European Large Area ISO survey, with limiting flux densities of \~2mJy at 15um & ~1mJy at 6.7um. We separate the stellar contribution from the extragalactic using identifications with APM sources made with the likelihood ratio technique. We quantify the completeness & reliability of our source extraction using (a) repeated observations over small areas, (b) cross-IDs with stars of known spectral type, (c) detections of the PSF wings around bright sources, (d) comparison with independent algorithms. Flux calibration at 15um was performed using stellar IDs; the calibration does not agree with the pre-flight estimates, probably due to effects of detector hysteresis and photometric aperture correction. The 6.7um extragalactic counts are broadly reproduced in the Pearson & Rowan-Robinson model, but the Franceschini et al. (1997) model underpredicts the observed source density by ~0.5-1 dex, though the photometry at 6.7um is still preliminary. At 15um the extragalactic counts are in excellent agreement with the predictions of the Pearson & Rowan-Robinson (1996), Franceschini et al. (1994), Guiderdoni et al. (1997) and the evolving models of Xu et al. (1998), over 7 orders of magnitude in 15um flux density. The counts agree with other estimates from the ISOCAM instrument at overlapping flux densities (Elbaz et al. 1999), provided a consistent flux calibration is used. Luminosity evolution at a rate of (1+z)^3, incorporating mid-IR spectral features, provides a better fit to the 15um differential counts than (1+z)^4 density evolution. No-evolution models are excluded, and implying that below around 10mJy at 15um the source counts become dominated by an evolving cosmological population of dust-shrouded starbursts and/or active galaxies.
dc.descriptionMNRAS in press. 14 pages, uses BoxedEPS (included). For more information on the ELAIS project see http://athena.ph.ic.ac.uk/
dc.identifierhttps://arxiv.org/abs/astro-ph/0003198
dc.identifierhttp://arxiv.org/abs/astro-ph/0003198
dc.identifierMon.Not.Roy.Astron.Soc.316:768,2000
dc.identifierdoi:10.1046/j.1365-8711.2000.03551.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/183462
dc.subjectAstrophysics
dc.titleThe European Large Area ISO Survey II: mid-infrared extragalactic source counts
dc.typetext

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