Service interruption on Monday 11 July from 12:30 to 13:00: all the sites of the CCSD (HAL, EpiSciences, SciencesConf, AureHAL) will be inaccessible (network hardware connection).
Skip to Main content Skip to Navigation
Journal articles

North Ecliptic Pole merging galaxy catalogue

Abstract :
Aims: We aim to generate a catalogue of merging galaxies within the 5.4 sq. deg. North Ecliptic Pole over the redshift range 0.0 < z < 0.3. To do this, imaging data from the Hyper Suprime-Cam are used along with morphological parameters derived from these same data.
Methods: The catalogue was generated using a hybrid approach. Two neural networks were trained to perform binary merger non-merger classifications: one for galaxies with z < 0.15 and another for 0.15 ≤ z < 0.30. Each network used the image and morphological parameters of a galaxy as input. The galaxies that were identified as merger candidates by the network were then visually checked by experts. The resulting mergers will be used to calculate the merger fraction as a function of redshift and compared with literature results.
Results: We found that 86.3% of galaxy mergers at z < 0.15 and 79.0% of mergers at 0.15 ≤ z < 0.30 are expected to be correctly identified by the networks. Of the 34 264 galaxies classified by the neural networks, 10 195 were found to be merger candidates. Of these, 2109 were visually identified to be merging galaxies. We find that the merger fraction increases with redshift, consistent with literature results from observations and simulations, and that there is a mild star-formation rate enhancement in the merger population of a factor of 1.102 ± 0.084.

Full Tables 1 and 4 are only available at the CDS via anonymous ftp to ( or via

Complete list of metadata
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Wednesday, June 8, 2022 - 4:21:15 PM
Last modification on : Saturday, June 25, 2022 - 3:17:11 AM


Publisher files allowed on an open archive




W. J. Pearson, L. E. Suelves, S. C. -C. Ho, N. Oi, S. Brough, et al.. North Ecliptic Pole merging galaxy catalogue. Astronomy & Astrophysics, 2022, 661, ⟨10.1051/0004-6361/202141013⟩. ⟨insu-03690862⟩



Record views


Files downloads