Molino, A;
Benitez, N;
Ascaso, B;
Coe, D;
Postman, M;
Jouvel, S;
Host, O;
... Zitrin, A; + view all
(2017)
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores.
Monthly Notices of the Royal Astronomical Society
, 470
(1)
pp. 95-113.
10.1093/mnras/stx1243.
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Abstract
We present accurate photometric redshifts for galaxies observed by the Cluster Lensing And Supernova survey with Hubble (CLASH). CLASH observed 25 massive galaxy cluster cores with the Hubble Space Telescope in 16 filters spanning 0.2–1.7 μm. Photometry in such crowded fields is challenging. Compared to our previously released catalogues, we make several improvements to the photometry, including smaller apertures, intracluster light subtraction, point spread function matching and empirically measured uncertainties. We further improve the Bayesian photometric redshift estimates by adding a redder elliptical template and by inflating the photometric uncertainties of the brightest galaxies. The resulting photometric redshift accuracies are dz/(1+z) ∼ 0.8, 1.0 and 2.0 per cent for galaxies with I-band F814W AB magnitudes < 18, 20 and 23, respectively. These results are consistent with our expectations. They improve on our previously reported accuracies by a factor of 4 at the bright end and a factor of 2 at the faint end. Our new catalogue includes 1257 spectroscopic redshifts, including 382 confirmed cluster members. We also provide stellar mass estimates. Finally, we include lensing magnification estimates of background galaxies based on our public lens models. Our new catalogue of all 25 CLASH clusters is available via Mikulski Archive for Space Telescopes. The analysis techniques developed here will be useful in other surveys of crowded fields, including the Frontier Fields and surveys carried out with Javalambre-Physics of the Accelerated Universe Astrophysical Survey and James Webb Space Telescope.
| Type: | Article |
|---|---|
| Title: | CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stx1243 |
| Publisher version: | https://doi.org/10.1093/mnras/stx1243 |
| Language: | English |
| Additional information: | © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Catalogues, Galaxies: Clusters: General, Galaxies: Distances And Redshifts Galaxies, Clusters: Intracluster Medium, Galaxies: Photometry, Ultraviolet: Galaxies., Deep Field-South, Space-Telescope Observations, Extragalactic Legacy Survey, Formation Rate Density, Star-Forming Galaxies, Weak-Lensing Shear, Yale-Chile Musyc, MACS J0416.1-2403, RXC J2248.7-4431, Alhambra Survey |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1571717 |
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