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Herschel deep far-infrared counts through Abell 2218 cluster-lens
- Source :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 518, pp.L17. ⟨10.1051/0004-6361/201014634⟩, Scopus-Elsevier, Astronomy and Astrophysics-A&A, 2010, 518, pp.L17. ⟨10.1051/0004-6361/201014634⟩
- Publication Year :
- 2016
-
Abstract
- Gravitational lensing by massive galaxy clusters allows study of the population of intrinsically faint infrared galaxies that lie below the sensitivity and confusion limits of current infrared and submillimeter telescopes. We present ultra-deep PACS 100 and 160 microns observations toward the cluster lens Abell 2218, to penetrate the Herschel confusion limit. We derive source counts down to a flux density of 1 mJy at 100 microns and 2 mJy at 160 microns, aided by strong gravitational lensing. At these levels, source densities are 20 and 10 beams/source in the two bands, approaching source density confusion at 160 microns. The slope of the counts below the turnover of the Euclidean-normalized differential curve is constrained in both bands and is consistent with most of the recent backwards evolutionary models. By integrating number counts over the flux range accessed by Abell 2218 lensing (0.94-35 mJy at 100 microns and 1.47-35 mJy at 160 microns, we retrieve a cosmic infrared background (CIB) surface brightness of ~8.0 and ~9.9 nW m^-2 sr^-1, in the respective bands. These values correspond to 55% (+/- 24%) and 77% (+/- 31%) of DIRBE direct measurements. Combining Abell 2218 results with wider/shallower fields, these figures increase to 62% (+/- 25%) and 88% (+/- 32%) CIB total fractions, resolved at 100 and 160 microns, disregarding the high uncertainties of DIRBE absolute values.<br />Accepted for publication on the A&A Herschel Special Issue, final version
- Subjects :
- Cosmology and Nongalactic Astrophysics (astro-ph.CO)
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
Strong gravitational lensing
Population
FOS: Physical sciences
Astrophysics
01 natural sciences
infrared: galaxies
[PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
surveys
galaxies: high-redshift
Cosmic infrared background
0103 physical sciences
Source counts
Surface brightness
education
010303 astronomy & astrophysics
Galaxy cluster
Physics
Luminous infrared galaxy
Galaxy: evolution
education.field_of_study
010308 nuclear & particles physics
gravitational lensing: strong
Astronomy and Astrophysics
Gravitational lens
Space and Planetary Science
galaxies: clusters: general
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Database :
- OpenAIRE
- Journal :
- Astronomy and Astrophysics-A&A, Astronomy and Astrophysics-A&A, EDP Sciences, 2010, 518, pp.L17. ⟨10.1051/0004-6361/201014634⟩, Scopus-Elsevier, Astronomy and Astrophysics-A&A, 2010, 518, pp.L17. ⟨10.1051/0004-6361/201014634⟩
- Accession number :
- edsair.doi.dedup.....9dff4f135ab6f54a8262ff605f6d4b99
- Full Text :
- https://doi.org/10.1051/0004-6361/201014634