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<form class="form header__form-search" method="get" action="/catalog/">
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    <input name="f" type="text" class="header__textfield" placeholder="Search RCSED catalog" value="">
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Reference Catalog of galaxy SEDs

Search galaxies database. Query can be anything: object name such as NGC 60,
coordinates: 236.5644 -0.1738 or J154615.45-001025.4, boolean expression:
gauss_f6565_h_alpha_flx / gauss_f6565_h_alpha_flx_err > 10 AND corrmag_u < 17.0,
cone search: cone('12:13:53.7 -01:13:53', '0.2arcmin').
Show query language
Tools and services
K-corrections calculator

Simple yet precise online service which allows one to determine k-corrections of
a galaxy in any popular photometric bandpass, given its redshift and one or more
colors. For bulk computation we provide easy-to-use Python and IDL code.

Reference catalog

A catalog of 800,299 UV-to-NIR galaxy spectral energy distributions and optical
spectra compiled from GALEX, SDSS and UKIDSS data, with additional value added
properties such as gas phase metallicities and non-parametric emission lines
measurements. Query it using search field above.

Galaxy colors

A universal relation of optical and near-UV colours and luminosities of
non-active galaxies which is connected to their star formation histories — the
first scientific result obtained with RCSED.

Articles and publications
Astronomers find runaway galaxies

By mining the RCSED database, astronomers have added 195 rare compact elliptical
galaxies to only 25 known before. Most of the newly discovered objects were in
galaxy clusters, but 11 were free fliers ejected by gravitational slingshot
effect from their birth places, the team reported in Science.

A new universal photometric relation for normal galaxies

Galaxies exhibit a bimodal distribution in the optical color-magnitude space
with a narrow "red sequence" populated by mostly early-type galaxies and a broad
"blue cloud" containing star-forming objects. Researchers from Harvard and Paris
Observatory added the near ultraviolet (NUV-r) color to it and discovered a
tight relation in the 3D color-color-magnitude space smoothly continuing from
the "blue cloud" to the "red sequence". Followed by the majority of galaxies, it
can be used as a powerful classification tool, as well as a new distance
estimator for intermediate redshifts that requires a minimal set of observables.

Tutorial: Discover rare galaxies in the RCSED catalog

Here we propose a step-by-step guide to reproduce a compact elliptical galaxy
search which resulted in a Science magazine publication. This guide exploits
Virtual Observatory desktop applications such as TOPCAT, VOSpec and Aladin, and
uses the RCSED catalog data.

About the catalog

RCSED (stands for the Reference Catalog of galaxy Spectral Energy Distributions)
is a catalog of galaxies produced as join between GALEX, SDSS, and UKIDSS
catalogs, and processed with state-of-the-art spectral analysis methods which
were not available earlier. It therefore covers approximately 25% of the sky and
contains k-corrected ultraviolet-to-near-infrared photometry of some 1 million
galaxies, as well as properties of their stellar population, stellar and gas
phase metallicity, morphological classification (from Galaxy Zoo), emission line
parameters (measured by gaussian fitting and non-parametrically) and bulge +
disk light profile decomposition (from Simard et al.) The multitude of data
access methods compatible with the Virtual Observatory (in particular, table and
spectral access services) and easy-to-use website with simple query language
make RCSED a new generation catalog.



As one of the richest data collections on galaxies RCSED enables wide range of
studies in extragalactic astrophysics (see examples in the Articles section). If
you find RCSED useful for your research, please acknowledge it.



Start by trying one of the example queries next to the search field above and
exploring individual webpages of found galaxies, or following a tutorial (we aim
to add more soon). Please note that if you do not find your favorite galaxy in
the RCSED database, it means that it is not included in the SDSS spectral sample
of galaxies, or possibly marked there as an active galactic nucleus. If you
believe that this is a mistake, please report it here.




BASIC SYNTAX

It is possible to filter RCSED catalog table using simple boolean expressions
query language which mimics syntax of WHERE clause in SQL language. The language
consists of arbitrary number of expressions combined together using AND or OR
clauses. Expression usually has the following structure (square brackets mean
optional clauses):

parameter operator value [AND | OR [NOT] expression] [, …]

where parameter is the name of any galaxy property present in the database, or
their arithmetic combination. There is no unit specification so the actual query
compares the data with user input value in the default database units.



QUERY EXAMPLES

 * NGC 60 – select galaxies in 1 arcmin vicinity of NGC 60
 * cone('Coma', '210arcmin') AND z > 0.0136 AND z < 0.0336 AND corrmag_g -
   corrmag_r < 0.4 – select bluer galaxies not further than 210 arcmin from Coma
   cluster center
 * gauss_f6565_h_alpha_flx / gauss_f6565_h_alpha_flx_err > 10 AND
   galaxyzoo_elliptical = 1 – select elliptical galaxies with signal-to-noise
   ratio of Hα emission above 10
 * objid IN {3, 4} – select specific sources by their object IDs (useful for
   larger subsets)

More details can be found in the query language documentation.
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