Browsing by Author "Kaviraj, Sugata"

Now showing items 21-29 of 29

    • 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 ...

    • Optimization of the Observing Cadence for the Rubin Observatory Legacy Survey of Space and Time: A Pioneering Process of Community-focused Experimental Design 

      Bianco, Federica B.; Ivezić, Željko; Jones, R. Lynne; Graham, Melissa L.; Marshall, Phil; Saha, Abhijit; Strauss, Michael A.; Yoachim, Peter; Ribeiro, Tiago; Anguita, Timo; Bauer, A. E.; Bauer, Franz E.; Bellm, Eric C.; Blum, Robert D.; Brandt, William N.; Brough, Sarah; Catelan, Márcio; Clarkson, William I.; Connolly, Andrew J.; Gawiser, Eric; Gizis, John E.; Hložek, Renée; Kaviraj, Sugata; Liu, Charles T.; Lochner, Michelle; Mahabal, Ashish A.; Mandelbaum, Rachel; McGehee, Peregrine; Neilsen Jr., Eric H.; Olsen, Knut A. G.; Peiris, Hiranya V.; Rhodes, Jason; Richards, Gordon T.; Ridgway, Stephen; Schwamb, Megan E.; Scolnic, Dan; Shemmer, Ohad; Slater, Colin T.; Slosar, Anže; Smartt, Stephen J.; Strader, Jay; Street, Rachel; Trilling, David E.; Verma, Aprajita; Vivas, A. K.; Wechsler, Risa H.; Willman, Beth (2021-12-22)
      Vera C. Rubin Observatory is a ground-based astronomical facility under construction, a joint project of the National Science Foundation and the U.S. Department of Energy, designed to conduct a multipurpose 10 yr optical ...

    • Radio AGN in spiral galaxies 

      Kaviraj, Sugata; Shabala, Stanislav S.; Deller, Adam T.; Middelberg, Enno (2015-12-01)
      Radio AGN in the nearby Universe are more likely to be found in galaxies with early-type morphology, the detection rate in spiral or late-type galaxies (LTGs) being around an order of magnitude lower. We combine the mJy ...

    • 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 ...

    • Star formation and agn activity in interacting galaxies : A near-UV perspective 

      Scott, Caroline; Kaviraj, Sugata (2014-01-21)
      We study nearby galaxies in close pairs to study the key factors affecting star formation and active galactic nuclei (AGN) activity triggered during galaxy interactions. Close pairs are selected from the Sloan Digital Sky ...

    • Star formation exists in all early-type galaxies -- evidence from ubiquitous structure in UV images 

      Pandey, Divya; Kaviraj, Sugata; Saha, Kanak; Sharma, Saurabh (2024-05-20)
      Recent surveys have demonstrated the widespread presence of UV emission in early-type (elliptical/S0) galaxies, suggesting the presence of star formation in many of these systems. However, potential UV contributions from ...

    • Translators of Galaxy Morphology Indicators between Observation and Simulation 

      Jang, J. K.; Yi, Sukyoung K.; Dubois, Yohan; Rhee, Jinsu; Pichon, Christophe; Kimm, Taysun; Devriendt, Julien; Volonteri, Marta; Kaviraj, Sugata; Peirani, Sebastien; Oh, Sree; Croom, Scott (2023-06-06)
      Based on the recent advancements in numerical simulations of galaxy formation, we anticipate the achievement of realistic models of galaxies in the near future. Morphology is the most basic and fundamental property of ...

    • The triggering of local AGN and their role in regulating star formation 

      Kaviraj, Sugata; Shabala, Stanislav S.; Deller, Adam T.; Middelberg, Enno (2015-09-01)
      We explore the processes that trigger local AGN and the role of these AGN in regulating star formation, using ~350 nearby galaxies observed by the mJy Imaging VLBA Exploration at 20cm (mJIVE) survey. The >10^7 K brightness ...

    • 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 ...