Browsing Research publications by Author "O'Connell, R.W."

Now showing items 1-11 of 11

    • Anatomy of a post-starburst minor merger : A multi-wavelength WFC3 study of NGC 4150 

      Crockett, R.M.; Kaviraj, S.; Silk, J.I.; Whitmore, B.C.; Mutchler, M.; Bond, H.E.; O'Connell, R.W.; Balick, B.; Calzetti, D.; Carollo, C.M.; Disney, M.J.; Dopita, M.A.; Frogel, J.A.; Hall, D.N.B.; Holtzman, J. A.; Kimble, R.A.; McCarthy, P.J.; Paresce, F.; Saha, A.; Trauger, J.T.; Walker, A.R.; Windhorst, R.A.; Young, E.T.; Jeong, H.; Yi, S.K. (2011-02-01)
      We present a spatially resolved near-UV/optical study, using the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope, of NGC 4150, a sub-L , early-type galaxy (ETG) of around 6 × 10 M , which has been observed ...

    • Constraining stellar assembly and active galactic nucleus feedback at the peak epoch of star formation 

      Kimm, T.; Kaviraj, S.; Devriendt, J.E.G.; Dubois, Y.; Slyz, A.; Cohen, S.H.; Windhorst, R.A.; Silk, J.; Hathi, N.P.; Ryan, R.E.; O'Connell, R.W.; Dopita, M.A. (2012-09-01)
      We study stellar assembly and feedback from active galactic nuclei (AGN) around the epoch of peak star formation (1 ≲ z ≲ 2), by comparing hydrodynamic simulations to rest-frame UV-optical galaxy colours from the Wide Field ...

    • The Hubble Space Telescope wide field camera 3 early release science data : Panchromatic faint object counts for 0.2-2 μm wavelength 

      Windhorst, R.A.; Cohen, S.H.; Mechtley, M.; Rutkowski, M.J.; Hathi, N.P.; McCarthy, P.J.; Seibert, M.; Ryan, R.E.; Yan, H.; Baldry, I.K.; Driver, S.P.; Hill, D.T.; Kelvin, L.S.; Robotham, A.S.G.; Frogel, J.A.; Koekemoer, A.M.; Bond, H.E.; Bushouse, H.; MacKenty, J.W.; Mutchler, M.; Whitmore, B.C.; O'Connell, R.W.; Straughn, A.N.; Kimble, R.A.; Tuffs, R.J.; Balick, B.; Calzetti, D.; Silk, J.I.; Crockett, M.; Kaviraj, S.; Disney, M.J.; Dopita, M.A.; Hall, D.N.B.; Holtzman, J. A.; Paresce, F.; Saha, A.; Trauger, J.T.; Walker, A.R.; Young, E.T. (2011-04-01)
      We describe the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) Early Release Science (ERS) observations in the Great Observatories Origins Deep Survey (GOODS) South field. The new WFC3 ERS data provide calibrated, ...

    • The insignificance of major mergers in driving star formation at z ≃ 2 

      Kaviraj, S.; Silk, J.; Cohen, S.; Windhorst, R.A.; Rutkowski, M.; O'Connell, R.W.; Dopita, M.A.; Dekel, A.; Hathi, N.P.; Straughn, A. (2013-02-01)
      We study the significance of major-merger-driven star formation in the early Universe, by quantifying the contribution of this process to the total star formation budget in 80 massive (M* > 1010 M) galaxies at z ≃ 2. ...

    • Minor-merger-driven growth of early-type galaxies over the last 8 billion years 

      Kaviraj, S.; Crockett, R.M.; Silk, J.; Ellis, R.S.; Yi, S.K.; O'Connell, R.W.; Windhorst, R.; Whitmore, B.C. (Cambridge University Press, 2011-09)
      We summarise recent progress in understanding the star formation activity in early-type galaxies (ETGs), using recent studies that leverage photometry in the rest-frame ultraviolet (UV) wavelengths. While classically thought ...

    • Newborn spheroids at high redshift : When and how did the dominant, old stars in today's massive galaxies form? 

      Kaviraj, S.; Silk, J.; Ellis, R.S.; Cohen, S.; Windhorst, R.A.; Peirani, S.; O'Connell, R.W.; Whitmore, B.C.; Ryan Jr., R.E.; Hathi, N.P.; Dopita, M.A.; Frogel, J.A.; Dekel, A. (2013-01-11)
      We study ~330 massive (M > 10M), newborn spheroidal galaxies (SGs) around the epoch of peak star formation (1 <z <3) to explore the high-redshift origin of SGs and gain insight into when and how the old stellar populations ...

    • A panchromatic catalog of early-type galaxies at intermediate redshift in the Hubble Space Telescope wide field camera 3 early release science field 

      Rutkowski, M.J.; Cohen, S.H.; Windhorst, R.A.; Kaviraj, S.; Crockett, R.M.; Silk, J.; O'Connell, R.W.; Hathi, N.P.; McCarthy, P.J.; Ryan Jr., R.E.; Koekemoer, A.; Bond, H.E.; Whitmore, B.C.; Yan, H.; Kimble, R.A.; Balick, B.; Calzetti, D.; Disney, M.J.; Dopita, M.A.; Frogel, J.A.; Hall, D.N.B.; Holtzman, J. A.; Paresce, F.; Saha, A.; Trauger, J.T.; Walker, A.R.; Young, E.T. (2012-03-01)
      In the first of a series of forthcoming publications, we present a panchromatic catalog of 102 visually selected early-type galaxies (ETGs) from observations in the Early Release Science (ERS) program with the Wide Field ...

    • The size evolution of passive galaxies : observations from the Wide-Field Camera 3 Early Release Science program 

      Ryan Jr., R.E.; McCarthy, P.J.; Cohen, S.H.; Rutkowski, M.J.; Mechtley, M.R.; Windhorst, R.A.; Yan, H.; Hathi, N.P.; Koekemoer, A. M.; Bond, H.E.; Bushouse, H.; MacKenty, J.; Mutchler, M.; Whitmore, B.C.; O'Connell, R.W.; Balick, B.; Calzetti, D.; Crockett, R.M.; Kaviraj, S.; Silk, J.I.; Disney, M.; Dopita, M.A.; Frogel, J.A.; Hall, D.N.B.; Holtzman, J. A.; Kimble, R.A.; Paresce, F.; Saha, A.; Trauger, J.; Walker, A.R.; Young, E. (2012-04-10)
      We present the size evolution of passively evolving galaxies at z 2 identified in Wide-Field Camera 3 imaging from the Early Release Science program. Our sample was constructed using an analog to the passive BzK galaxy ...

    • Triggered star formation in the inner filament of Centaurus A 

      Crockett, R.M.; Shabala, S.S.; Kaviraj, S.; Silk, J.; Antonuccio-Delogu, V.; Mutchler, M.; Whitmore, B.C.; O'Connell, R.W.; Rejkuba, M.; Windhorst, R.A. (2012-04-01)
      We present recent Hubble Space Telescope observations of the inner filament of Centaurus A, using the new Wide Field Camera 3 (WFC3) F225W, F657N and F814W filters. We find a young stellar population near the south-west ...

    • UV bright globular clusters in M87 : More evidence for super-He-rich stellar populations? 

      Kaviraj, S.; Sohn, S.T.; O'Connell, R.W.; Yoon, S.-J.; Lee, Y.W.; Yi, S.K. (2007-05-01)
      We study the ultraviolet (UV) and optical properties of 38 massive globular clusters (GCs) in the Virgo elliptical, M87, imaged using the STIS and WFPC2 instruments onboard the Hubble Space Telescope. The majority of these ...

    • A WFC3 study of globular clusters in NGC 4150 : An early-type minor merger 

      Kaviraj, S.; Mark Crockett, R.; Silk, J.; Whitmore, B.C.; Mutchler, M.; O'Connell, R.W.; Windhorst, R.A.; Rejkuba, M.; Yi, S.; Frogel, J.A.; Calzetti, D. (2012-05-01)
      We combine near-ultraviolet (NUV; 2250 Å) and optical (U, B, V, I) imaging from the Wide Field Camera 3 (WFC3), on-board the Hubble Space Telescope (HST), to study the globular cluster (GC) population in NGC 4150, a sub-L* ...