North Ecliptic Pole merging galaxy catalogue
Astronomy and Astrophysics, vol. 661, pp. A52
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 withz< 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 atz< 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.
Authors 20
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National Centre for Nuclear Research
Affiliation as printed
National Centre for Nuclear Research, Pasteura 7, 02-093 Warszawa, Poland
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National Centre for Nuclear Research
Affiliation as printed
National Centre for Nuclear Research, Pasteura 7, 02-093 Warszawa, Poland
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Affiliation as printed
Institute of Astronomy, National Tsing Hua University, 101, Section 2. Kuang-Fu Road, Hsinchu 30013, Taiwan
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Affiliation as printed
Faculty of Science Division II, Liberal Arts, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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Affiliation as printed
School of Physics, University of New South Wales, NSW 2052, Australia
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Affiliation as printed
Department of Physics and Astronomy, 102 Natural Science Building, University of Louisville, Louisville, KY 40292, USA
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Australian Astronomical Optics
Affiliation as printed
Australian Astronomical Optics, Macquarie University, 105 Delhi Rd, North Ryde, NSW 2113, Australia
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The Graduate University for Advanced Studies, SOKENDAI · Japan Aerospace Exploration Agency · Institute of Space and Astronautical Science
Affiliation as printed
Department of Space and Astronautical Science, Graduate University for Advanced Studies, SOKENDAI, Shonankokusaimura, Hayama, Miura District, Kanagawa 240-0193, Japan
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan
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Affiliation as printed
Astronomy Program, Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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Affiliation as printed
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USA
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Affiliation as printed
Institute of Astronomy, National Tsing Hua University, 101, Section 2. Kuang-Fu Road, Hsinchu 30013, Taiwan
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ASTRO-3D · ARC Centre of Excellence for All-sky Astrophysics · Australian Astronomical Optics · Macquarie University
Affiliation as printed
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO-3D)
Australian Astronomical Optics, Macquarie University, 105 Delhi Rd, North Ryde, NSW 2113, Australia
Department of Physics and Astronomy, Macquarie University, NSW 2109, Australia
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Centre National de la Recherche Scientifique · Aix-Marseille Université · National Centre for Nuclear Research
Affiliation as printed
Aix Marseille Univ. CNRS, CNES, LAM, Marseille, France
National Centre for Nuclear Research, Pasteura 7, 02-093 Warszawa, Poland
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Rutherford Appleton Laboratory · The Open University · University of Oxford
Affiliation as printed
Oxford Astrophysics, University of Oxford, Keble Rd, Oxford OX1 3RH, UK
RAL Space, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
The Open University, Milton Keynes, MK7 6AA, UK
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National Centre for Nuclear Research
Affiliation as printed
National Centre for Nuclear Research, Pasteura 7, 02-093 Warszawa, Poland
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National Centre for Nuclear Research
Affiliation as printed
National Centre for Nuclear Research, Pasteura 7, 02-093 Warszawa, Poland
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Universidad Nacional Autónoma de México
Affiliation as printed
Instituto de Radioastronomía y Astrofísica, Universidad Nacional Autónoma de México, A.P. 72-3, 58089 Morelia, Mexico
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Affiliation as printed
Department of Earth Science Education, Kyungpook National University, Daegu 41566, Republic of Korea
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Institute of Astronomy and Astrophysics, Academia Sinica · Kyoto University · Ehime University · Academia Sinica
Affiliation as printed
Academia Sinica Institute of Astronomy and Astrophysics, 11F of Astronomy-Mathematics Building, AS/NTU, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan
Research Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
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University of Groningen · Space Research Organisation Netherlands
Affiliation as printed
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD Groningen, The Netherlands
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