20 research outputs found
New national and regional bryophyte records, 43.
Bryological Note
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores
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 m. Photometry in such crowded fields is challenging.
Compared to our previously released catalogs, we make several improvements to
the photometry, including smaller apertures, ICL subtraction, PSF matching, and
empirically measured uncertainties. We further improve the Bayesian Photometric
Redshift (BPZ) 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\% 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 catalog 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 catalog of all 25
CLASH clusters is available via MAST. The analysis techniques developed here
will be useful in other surveys of crowded fields, including the Frontier
Fields and surveys carried out with J-PAS and JWST.Comment: 21 pages, 21 figures, 5 tables. Photo-z Catalogues Available.
Accepted for publication in MNRA
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores
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 mu m. 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) similar to 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
VizieR Online Data Catalog: CLASH galaxies photometric redshifts in 25 ClG (Molino+, 2017)
New photometric redshift catalogue for the 25 CLASH massive galaxy clusters. The catalogue includes astrometric, morphologic, photometric and photo-z information for all detected sources in an NIR detection image (e.g. a weighted sum of WFC3/IR images: F105W, F110W, F125W, F140W, F160W). (26 data files)
CLASH: accurate photometric redshifts with 14 HST bands in massive galaxy cluster cores
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
New national and regional bryophyte records, 43
International audienc