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Dec 13, 2022

New GaiaSpecTool available on GaiaPortal@SSDC

The new GaiaSPECtool tab is now online!
Easy-to-use GaiaPortal combined with powerful GaiaXPy spectra handling!
This new tool is based on the official Python package GaiaXPy, developed and maintained by members of the Gaia Data Processing and Analysis Consortium (DPAC) and in particular, Coordination Unit 5 (CU5), and the Data Processing Centre located at the Institute of Astronomy, Cambridge, UK (DPCI).

GaiaSPECtool can be used on a single Gaia DR3 source or, for registered users only, on a list of sources to:
  • convert Gaia DR3 mean spectra from a continuous representation to a sampled spectrum, optionally on a user-defined wavelength grid. Sampled spectra can be provided in two data formats:
    1. two separate files, one with the wavelength sampling array, the other containing in each line the sourceId, flux, and fluxerror arrays (in [W m-2 nm-1]);
    2. individual csv files (one for each source), containing 3 columns (wavelength, flux, fluxerror in [W m-2nm-1] or [erg cm-2 s-1 -1]).
    Plots of the spectra can also be requested.
  • Compute synthetic photometry in bands that are covered by the BP/RP wavelength range.
    Several sets of filters are included in the package.
  • The original Gaia DR3 continuous mean spectra are also provided in a single csv file, for use with a local installation of GaiaXPy, if needed.

GaiaSPECtool can be accessed here, through the GaiaPortal DR3 main tab.

Jun 13, 2022

SSDC contribution to Gaia DR3

On June 13th the Gaia collaboration has released its Gaia Data Release 3 catalogue.
Gaia DR3 data are based on data collected between 25 July 2014 and 28 May 2017, spanning a period of 34 months. As a comparison, Gaia DR2 was based on 22 months of data and Gaia DR1 was based on observations collected during the first 14 months of Gaia's routine operational phase.
Gaia DR3 catalogue contains more than 1.8 billion stars with proper motion and parallax for 1.5 billion sources.
Gaia DR3 catalogue also includes BP and RP spectra for 220 million stars, RVS spectra for 1 million stars and epoch photometry for more than 11 million stars. Gaia is also publishing the astrophysical parameters for more than 1.5 billion stars, radial velocity measurements for 34 million stars and variability measurements for more than 10.5 million sources.

SSDC is one of the four ESA partner data centers for the publication and dissemination of Gaia data releases.
SSDC has thus designed, developed, and made publicly available an access point to the Gaia and cross-matched external catalogues data: the GaiaPortal. SSDC is continuing to develop access, data extraction and multi-wavelength cross-match tools to enable the astronomical community to handle and fully exploit the scientific potential of this enormous archive.
In addition, SSDC is responsible for the calculation of the official cross-match of the Gaia catalogue with the largest public available optical and near-IR catalogues ensuring an all-sky, panchromatic vision of the universe.

Jun 11, 2022

Happy 14-year birthday, GLAST/Fermi!

On June 11, 2008 (14 years ago) NASA launched the Fermi Gamma-ray Large Area Space Telescope (previously known as GLAST) into orbit. Fermi satellite's name was chosen to honor the famous Italian physicist Enrico Fermi, who first proposed the eponymous mechanism for the acceleration of cosmic rays that creates many of the high-energy gamma rays that the satellite detects. Fermi LAT is continuing to map the entire high-energy gamma-ray sky every ~three hours. Recently the Data-Release 3 of the incremental version of the fourth Fermi LAT catalog of gamma-ray sources (4FGL-DR3) based on the first twelve years of science data in the energy range from 50 MeV to 1 TeV, and containing 6658 sources, has been published. The companion fourth LAT catalog of active galactic nuclei (data release 3, 4LAC-DR3), co-driven by the SSDC Fermi team , includes 1607 new AGN sources relative to the initial 4FGL-DR1 catalog.
The LAT science photon event data archive at the SSDC currently holds more than 1 billion and 530 millions gamma-ray photons ready for science analysis. Finally the 10th International Fermi Symposium will be held in Johannesburg, South Africa, from October 9-15, 2022. Fermi LAT and GMB detectors and instruments were built and are operated by an international collaboration between astrophysicists and particle physicists from the United States, France, Germany, Italy, Japan and Sweden.