Browsing Faculty of Natural Sciences by Author "Vaccari, Mattia"

Now showing items 1-14 of 14

    • A Comparison of deep learning architectures for optical galaxy morphology classification 

      Fielding, Ezra; Nyirenda, Clement N.; Vaccari, Mattia (International Conference on Electrical, Computer and Energy Technologies (ICECET), 2021)
      The classification of galaxy morphology plays a crucial role in understanding galaxy formation and evolution. Traditionally, this process is done manually. The emergence of deep learning techniques has given room for the ...

    • Cosmos2020: A panchromatic view of the universe to z∼10 from two complementary catalogs 

      Weaver, John R.; Kauffmann, Olivier; Vaccari, Mattia (IOP Publishing, 2022)
      The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This ...

    • Galaxy–galaxy lensing in the voice deep survey 

      Luo, Ruibiao; Fu, Liping; Vaccari, Mattia (EDP Sciences, 2022)
      The multi-band photometry of the VOICE imaging data, overlapping with 4.9 deg2 of the Chandra Deep Field South (CDFS) area, enables both shape measurement and photometric redshift estimation to be the two essential ...

    • Hydra I: An extensible multi-source-finder comparison and cataloguing tool 

      Boyce, M. M.; Hopkins, A. M.; Vaccari, Mattia (Cambridge University Press, 2023)
      The latest generation of radio surveys are now producing sky survey images containing many millions of radio sources. In this context it is highly desirable to understand the performance of radio image source finder (SF) ...

    • Hydra ii: Characterisation of Aegean, Caesar, profound, pybdsf, and selavy source finders 

      Boyce, M. M.; Hopkins, A. M.; Vaccari, Mattia (Cambridge University Press, 2023)
      We present a comparison between the performance of a selection of source finders using a new software tool called Hydra. The companion paper, Paper I, introduced the Hydra tool and demonstrated its performance using ...

    • Lenses In VoicE (LIVE): Searching for strong gravitational lenses in the VOICE@VST survey using Convolutional Neural Networks 

      Vaccari, Mattia (Monthly notices of the Royal Astronomical Society, 2021)
      We present a sample of 16 likely strong gravitational lenses identified in the VST Optical Imaging of the CDFS and ES1 fields (VOICE survey) using Convolutional Neural Networks (CNNs). We train two different CNNs on composite ...

    • Mightee-hi: Evolution of hi scaling relations of star-forming galaxies at z < 0.5* 

      Sinigaglia, Francesco; Rodighiero, Giulia; Vaccari, Mattia (IOP Publishing, 2022)
      We present the first measurements of H I galaxy scaling relations from a blind survey at z > 0.15. We perform spectral stacking of 9023 spectra of star-forming galaxies undetected in H I at 0.23 < z < 0.49, extracted ...

    • An overview of the Dwarf Galaxy Survey 

      Remy-Ruyer, A.; Galametz, M.; Vaccari, Mattia; Madden, S.C. (The Astronomical Society of the Pacific, 2013)
      The Dwarf Galaxy Survey (DGS) program is studying low-metallicity galax- ies using 230h of far-infrared (FIR) and submillimetre (submm) photometric and spectroscopic observations of the Herschel Space Observatory and ...

    • Revised SWIRE photometric redshifts 

      Rowan-Robinson, Michael; Gonzalez-Solares, Eduardo A.; Vaccari, Mattia; Marchetti, L. (Oxford University Press, 2013)
      We have revised the Spitzer Wide-Area Infrared Extragalactic survey (SWIRE) Photometric Redshift Catalogue to take account of new optical photometry in several of the SWIRE areas, and incorporating Two Micron All Sky ...

    • The role of environment in galaxy evolution in the servs survey. I. density maps and cluster candidates 

      Vaccari, Mattia; Krefting, Nick; Sajina, Anna (The American Astronomical Society, 2020)
      We use photometric redshifts derived from new u-band through 4.5 μm Spitzer IRAC photometry in the 4.8 deg2 of the XMM-LSS field to construct surface density maps in the redshift range of 0.1–1.5. Our density maps ...

    • The roles of star formation and AGN activity of IRS sources in the HerMES fields 

      Feltre, Anna; Hatziminaoglou, Evanthia; Vaccari, Mattia; Hernán-Caballero, Antonio; Fritz, Jacopo; Franceschini, Alberto; Bock, J.; Cooray, Asantha; Farrah, Duncan; Gonzalez-Solares, Eduardo A.; Ibar, Edo; Isaak, Kate G.; Lo Faro, Barbara; Marchetti, L.; Oliver, Seb J.; Page, Matthew J.; Rigopoulou, Dimitra; Roseboom, Isaac G.; Symeonidis, Myrto (Oxford University Press, 2013)
      In this work we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in these ...

    • A structure function analysis of vst-cosmos agn 

      de Cicco, Demetra; Bauer, Franz E.; Vaccari, Mattia (EDP Sciences, 2022)
      We present our sixth work in a series dedicated to variability studies of active galactic nuclei (AGN), based on the survey of the COSMOS field by the VLT Survey Telescope (VST). Its 54 r-band visits over 3.3 yr and ...

    • Variability and transient search in the SUDARE–VOICE field: A new method to extract the light curves 

      Vaccari, Mattia; Liu, Dezi; Deng, Wenqiang (Oxford University Press, 2020)
      The VLT Survey Telescope (VST) Optical Imaging of the CDFS and ES1 Fields Survey, in synergy with the SUDARE survey, is a deep optical ugri imaging of the CDFS and ES1 fields using the VST. The observations for the CDFS ...

    • The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to z∼5 

      Vaccari, Mattia; Leslie, Sarah K.; Schinnerer, Eva (IOP Publishing, 2020)
      We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR) – stellar mass (M∗) relation, called the main sequence of star-forming galaxies (MS), for starforming and all galaxies ...