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Bibliographical reference
Astronomy and Astrophysics, Volume 622, id.A176, 25 pp.
Description
The Javalambre Photometric Local Universe Survey (J-PLUS ) is an ongoing
12-band photometric optical survey, observing thousands of square
degrees of the Northern Hemisphere from the dedicated JAST/T80 telescope
at the Observatorio Astrofísico de Javalambre (OAJ). The T80Cam
is a camera with a field of view of 2 deg2 mounted on a
telescope with a diameter of 83 cm, and is equipped with a unique system
of filters spanning the entire optical range (3500-10 000 Å). This
filter system is a combination of broad-, medium-, and narrow-band
filters, optimally designed to extract the rest-frame spectral features
(the 3700-4000 Å Balmer break region, Hδ, Ca H+K, the G
band, and the Mg b and Ca triplets) that are key to characterizing
stellar types and delivering a low-resolution photospectrum for each
pixel of the observed sky. With a typical depth of AB ˜21.25 mag
per band, this filter set thus allows for an unbiased and accurate
characterization of the stellar population in our Galaxy, it provides an
unprecedented 2D photospectral information for all resolved galaxies in
the local Universe, as well as accurate photo-z estimates (at the
δ z/(1 + z)˜0.005-0.03 precision level) for moderately
bright (up to r ˜ 20 mag) extragalactic sources. While some
narrow-band filters are designed for the study of particular emission
features ([O II]/λ3727, Hα/λ6563) up to z <
0.017, they also provide well-defined windows for the analysis of other
emission lines at higher redshifts. As a result, J-PLUS has the
potential to contribute to a wide range of fields in Astrophysics, both
in the nearby Universe (Milky Way structure, globular clusters, 2D
IFU-like studies, stellar populations of nearby and moderate-redshift
galaxies, clusters of galaxies) and at high redshifts (emission-line
galaxies at z ≈ 0.77, 2.2, and 4.4, quasi-stellar objects, etc.).
With this paper, we release the first ˜1000 deg2 of
J-PLUS data, containing about 4.3 million stars and 3.0 million galaxies
at r < 21 mag. With a goal of 8500 deg2 for the total
J-PLUS footprint, these numbers are expected to rise to about 35 million
stars and 24 million galaxies by the end of the survey.
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