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Session: Extragalactic Astronomy and Astrophysics

Name: Mr. Elias Kyritsis (IA-FORTH & Univ. of Crete)
Coauthors: Kovlakas Konstantinos (Institute of Space Sciences (IEEC-CSIC))
Kouroumpatzakis Konstantinos (Astronomical Institute Czech Academy of Sciences)
Zezas Andreas (Institute of Astrophysics -FORTH/ Physics Department - UoC)
Charalampos Daoutis (Institute of Astrophysics -FORTH/ Physics Department - UoC)
Type: Poster
Title: The Heraklion Extragalactic Catalogue (HECATE v2.0): A value-added catalogue and its applications
Abstract:

The Heraklion Extragalactic CATalogue is a reference catalog which contains all known nearby galaxies in the local Universe (D ≲ 200 Mpc). By incorporating and homogenizing data from HyperLEDA, NED, and infrared/optical surveys, the catalog provides a broad array of information such as positions, sizes, distances, morphological classifications, Star Formation Rate (SFR), stellar mass (M⋆), metallicity, and activity classifications. In the updated version (v2.0) of the catalogue, we increase the completeness of SFR, and M⋆ from ∼46% and ∼65%, to ∼76% and ∼90%, respectively. We use a combination of new multi-band calibrations and standard monochromatic mid-infrared diagnostics. In addition, we calculate the gas-phase metallicity of the galaxies, using the standard emission line-based calibrations, and the stellar mass-metallicity relation. As a result, the completeness of the metallicity is increased from ∼30% to ∼90%. Finally, by applying a new galactic activity classifier based on a machine learning model using mid-IR/optical colors, we increase the activity classification in the catalog from ∼30% to ∼60%. This catalog can have several astrophysical applications such as the identification of the hosts of gravitational-wave (GW) events, demographics of different source populations, and the connection between the X-ray luminosity of galaxies with their stellar population parameters using large statistical samples.