Browsing Research publications by Author "Martin, Garreth"

Now showing items 1-11 of 11

    • AGN in dwarf galaxies: frequency, triggering processes and the plausibility of AGN feedback 

      Kaviraj, Sugata; Martin, Garreth; Silk, Joseph (2019-10-01)
      While active galactic nuclei (AGN) are considered to be key drivers of the evolution of massive galaxies, their potentially significant role in the dwarf-galaxy regime (M ∗ < 10 9 M ⊙) remains largely unexplored. We combine ...

    • Emergence and cosmic evolution of the Kennicutt-Schmidt relation driven by interstellar turbulence 

      Kraljic, Katarina; Renaud, Florent; Dubois, Yohan; Pichon, Christophe; Agertz, Oscar; Andersson, Eric; Devriendt, Julien; Freundlich, Jonathan; Kaviraj, Sugata; Kimm, Taysun; Martin, Garreth; Peirani, Sébastien; Otero, Álvaro Segovia; Volonteri, Marta; Yi, Sukyoung K. (2024-01-31)
      The scaling relations between the gas content and star formation rate of galaxies provide useful insights into the processes governing their formation and evolution. We investigated the emergence and the physical drivers ...

    • A flat trend of star-formation rate with X-ray luminosity of galaxies hosting AGN in the SCUBA-2 Cosmology Legacy Survey 

      Ramasawmy, Joanna; Stevens, Jason; Martin, Garreth; Geach, James E. (2019-07-01)
      Feedback processes from active galactic nuclei (AGN) are thought to play a crucial role in regulating star formation in massive galaxies. Previous studies using Herschel have resulted in conflicting conclusions as to whether ...

    • Galaxy morphological classification in deep-wide surveys via unsupervised machine learning 

      Martin, Garreth; Kaviraj, Sugata; Hocking, Alex; Read, Shaun C.; Geach, James E. (2019-10-26)
      Galaxy morphology is a fundamental quantity, that is essential not only for the full spectrum of galaxy-evolution studies, but also for a plethora of science in observational cosmology. While a rich literature exists on ...

    • How the spectral energy distribution and galaxy morphology constrain each other, with application to morphological selection using galaxy colours 

      Uzeirbegovic, Emir; Martin, Garreth; Kaviraj, Sugata (2022-03-01)
      We introduce an empirical methodology to study how the spectral energy distribution (SED) and galaxy morphology constrain each other and implement this on 8000 galaxies from the HST CANDELS survey in the GOODS-South field. ...

    • Introducing the NewHorizon simulation : Galaxy properties with resolved internal dynamics across cosmic time 

      Dubois, Yohan; Beckmann, Ricarda; Bournaud, Frédéric; Choi, Hoseung; Devriendt, Julien; Jackson, Ryan; Kaviraj, Sugata; Kimm, Taysun; Kraljic, Katarina; Laigle, Clotilde; Martin, Garreth; Park, Min-Jung; Peirani, Sébastien; Pichon, Christophe; Volonteri, Marta; Yi, Sukyoung K. (2021-07-28)
      Hydrodynamical cosmological simulations are increasing their level of realism by considering more physical processes and having greater resolution or larger statistics. However, usually either the statistical power of such ...

    • The morphological mix of dwarf galaxies in the nearby Universe 

      Lazar, Ilin; Kaviraj, Sugata; Watkins, Aaron E.; Martin, Garreth; Bichang'a, Brian; Jackson, Ryan A. (2024-03-01)
      We use a complete, unbiased sample of 257 dwarf (10 8 M < M < 10 9.5 M) galaxies at z < 0.08, in the COSMOS field, to study the morphological mix of the dwarf population in low-density environments. Visual inspection of ...

    • Relaxed blue ellipticals: accretion-driven stellar growth is a key evolutionary channel for low mass elliptical galaxies 

      Lazar, Ilin; Kaviraj, Sugata; Martin, Garreth; Laigle, Clotilde; Watkins, Aaron; Jackson, Ryan (2023-04-30)
      How elliptical galaxies form is a key question in observational cosmology. While the formation of massive ellipticals is strongly linked to mergers, the low mass (M⋆/M⊙ < 10^9.5 regime remains less well explored. In ...

    • The structural properties of nearby dwarf galaxies in low density environments - size, surface brightness and colour gradients 

      Lazar, Ilin; Kaviraj, Sugata; Watkins, Aaron; Martin, Garreth; Bichanga, Brian; Jackson, Ryan (2024-10-31)
      We use a complete sample of 211 nearby (z<0.008), dwarf (10 8 M⊙ < M ∗< 10 9.5 M⊙) galaxies in low-density environments, to study their structural properties: effective radii (R e), effective surface brightnesses (μ e), ...

    • The Ultraviolet Luminosity Function at 0.6 < z < 1 from UVCANDELS 

      the UVCANDELS team; Sun, Lei; Wang, Xin; Teplitz, Harry I.; Mehta, Vihang; Alavi, Anahita; Rafelski, Marc; Windhorst, Rogier A.; Scarlata, Claudia; Gardner, Jonathan P.; Smith, Brent M.; Sunnquist, Ben; Prichard, Laura; Cheng, Yingjie; Grogin, Norman; Hathi, Nimish P.; Hayes, Matthew; Koekemoer, Anton M.; Mobasher, Bahram; Nedkova, Kalina V.; O’Connell, Robert; Robertson, Brant; Taamoli, Sina; Yung, L. Y. Aaron; Brammer, Gabriel; Colbert, James; Conselice, Christopher; Gawiser, Eric; Guo, Yicheng; Jansen, Rolf A.; Ji, Zhiyuan; Lucas, Ray A.; Rutkowski, Michael; Siana, Brian; Vanzella, Eros; Ashcraft, Teresa; Bagley, Micaela; Baronchelli, Ivano; Barro, Guillermo; Blanche, Alex; Broussard, Adam; Carleton, Timothy; Chartab, Nima; Codoreanu, Alex; Cohen, Seth; Dai, Y. Sophia; Darvish, Behnam; Davé, Romeel; Kaviraj, Sugata; Lazar, Ilin; Martin, Garreth (2024-08-21)
      UVCANDELS is a Hubble Space Telescope Cycle-26 Treasury Program awarded 164 orbits of primary ultraviolet (UV) F275W imaging and coordinated parallel optical F435W imaging in four CANDELS fields—GOODS-N, GOODS-S, EGS, and ...

    • Why do extremely massive disc galaxies exist today? 

      Jackson, Ryan A.; Martin, Garreth; Kaviraj, Sugata; Laigle, Clotilde; Devriendt, Julien; Dubois, Yohan; Pichon, Christophe (2020-06-01)
      Galaxy merger histories correlate strongly with stellar mass, largely regardless of morphology. Thus, at fixed stellar mass, spheroids and discs share similar assembly histories, both in terms of the frequency of mergers ...