Bibcode
Borlaff, A.; Trujillo, I.; Román, J.r; Beckman, J. E.; Eliche-Moral, M. C.; Infante-Sáinz, R.; Lumbreras-Calle, A.; de Almagro, Rodrigo Takuro Sato Martín; Gómez-Guijarro, Carlos; Cebrián, M.; Dorta, A.; Cardiel, Nicolás; Akhlaghi, Mohammad; Martínez-Lombilla, C.
Bibliographical reference
Astronomy and Astrophysics, Volume 621, id.A133, 34 pp.
Advertised on:
1
2019
Journal
Citations
44
Refereed citations
38
Description
Context. The Hubble Ultra Deep field (HUDF) is the deepest region ever
observed with the Hubble Space Telescope. With the main objective of
unveiling the nature of galaxies up to z ˜ 7 - 8, the observing
and reduction strategy have focused on the properties of small and
unresolved objects, rather than the outskirts of the largest objects,
which are usually over-subtracted. Aims: We aim to create a new
set of WFC3 IR mosaics of the HUDF using novel techniques to preserve
the properties of the low surface brightness regions. Methods: We
created ABYSS: a pipeline that optimises the estimate and modelling of
low-level systematic effects to obtain a robust background subtraction.
We have improved four key points in the reduction: 1) creation of new
absolute sky flat fields, 2) extended persistence models, 3) dedicated
sky background subtraction and 4) robust co-adding. Results: The
new mosaics successfully recover the low surface brightness structure
removed on the previous HUDF published reductions. The amount of light
recovered with a mean surface brightness dimmer than μ¯ = 26 mag
arcsec-2 is equivalent to a m = 19 mag source when compared
to the XDF and a m = 20 mag compared to the HUDF12. Conclusions:
We present a set of techniques to reduce ultra-deep images (μ >
32.5 mag arcsec-2, 3σ in 10 × 10 arcsec boxes),
that successfully allow us to detect the low surface brightness
structure of extended sources on ultra deep surveys. The developed
procedures are applicable to HST, JWST, EUCLID and many other space and
ground-based observatories.
The final ABYSS WFC3 IR HUDF mosaics are only available at http://www.iac.es/proyecto/abyss/
and at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/621/A133
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