The ARCHES Archive at CAB (INTA-CSIC) is accessed by means of a
web-based fill-in form which permits queries driven by lists of
object names and/or coordinates and radius. 3XMM identifiers are
directly searched in the ARCHES database. Other object names are
resolved using the
The output format is in HTML and the Spectral Energy Distributions
(SEDs) can be downloaded in VOTable or ASCII format. The magnitude
to flux conversion was done using the Filter Profile
Service of the Spanish
The calculations of the distances between the input data and the
targets in the database are done using the
Haversine formula. Results of searches using 3XMM identifiers
will have associated a distance of zero.
Result from Search
The system provides the following functionalities:
- Single / Multidownload: SEDs in VOTable format can be
retrieved individually or in groups. Multidownload generates a
file in ZIP format. Only one instance of each SED found is provided,
even if it appears twice in the output table.
- SAMP: The ARCHES archive implements the SAMP (Simple
Application Messaging Protocol). SAMP allows applications to
communicate with each other in a seamless and transparent way for
the user. This way, the ARCHES SEDs can be easily transferred to
other VO application, such as VOSpec or Topcat.
- Results associated to specific catalogues can be shown or
- Moving the pointer over a column title will show a tooltip with
information about it.
- Note: fluxes are not computed for upper limits in magnitude
- The ARCHES SED archive currently provides access to the following ARCHES cross-correlated catalogues:
- 3XMMe fluxes are given in erg/cm2/s. For the SED building
they were transformed to W/m2/m using the following procedure:
- Divide by 1E+3 to transform fluxes from erg/cm2/s to
- Compute the wavelength range (angstroms) from the
associated energy (keV) using the formulae
This way, 6.1 keV - the central point of the 3XMMe XC_EP_8 band
(0.12keV-12keV)- is equal to 2.033 angstroms.
- Divide the flux computed in the first step by the wavelength range
- Multiply by 1e+10 to express the flux in W/m2/m