Search Publications
GREAT3 results - I. Systematic errors in shear estimation and the impact of real galaxy morphology
Zhang, Jun; Hogg, David W.; Gavazzi, Raphaël +40 more
We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and …
On the possible environmental effect in distributing heavy elements beyond individual gaseous haloes
Johnson, Sean D.; Chen, Hsiao-Wen; Mulchaey, John S.
We present a study of extended galaxy halo gas through H I and O VI absorption over two decades in projected distance at z ≈ 0.2. The study is based on a sample of 95 galaxies from a highly complete (>80 per cent) survey of faint galaxies (L > 0.1L*) with archival quasar absorption spectra and 53 galaxies from the literature. A cl…
Resolved spectroscopy of gravitationally lensed galaxies: global dynamics and star-forming clumps on ∼100 pc scales at 1 < z < 4
Smail, Ian; Swinbank, A. M.; Bower, R. G. +9 more
We present adaptive optics-assisted integral field spectroscopy around the Hα or Hβ lines of 12 gravitationally lensed galaxies obtained with VLT/SINFONI, Keck/OSIRIS and Gemini/NIFS. We combine these data with previous observations and investigate the dynamics and star formation properties of 17 lensed galaxies at 1 < z < 4. Thanks to gravi…
A tidal disruption flare in a massive galaxy? Implications for the fuelling mechanisms of nuclear black holes
Greiner, J.; Georgakakis, A.; Salvato, M. +6 more
We argue that the `changing look' active galactic nucleus (AGN) recently reported by LaMassa et al. could be a luminous flare produced by the tidal disruption of a supersolar mass star passing just a few gravitational radii outside the event horizon of a ∼108 M⊙ nuclear black hole. This flare occurred in a massive, star-formi…
The nature of the [C II] emission in dusty star-forming galaxies from the SPT survey
Béthermin, M.; Murphy, E. J.; Greve, T. R. +24 more
We present [C II] observations of 20 strongly lensed dusty star-forming galaxies at 2.1 < z < 5.7 using Atacama Pathfinder EXperiment and Herschel. The sources were selected on their 1.4 mm flux (S1.4 mm > 20 mJy) from the South Pole Telescope (SPT) survey, with far-infrared (FIR) luminosities determined from extensive photomet…
Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using ∼180 multiple images
Kneib, J. -P.; Egami, E.; Eckert, D. +11 more
We present a high-precision mass model of galaxy cluster Abell 2744, based on a strong gravitational-lensing analysis of the Hubble Space Telescope Frontier Fields (HFF) imaging data, which now include both Advanced Camera for Surveys and Wide Field Camera 3 observations to the final depth. Taking advantage of the unprecedented depth of the visibl…
The Suzaku view of highly ionized outflows in AGN - II. Location, energetics and scalings with bolometric luminosity
Cappi, M.; Turner, T. J.; Tombesi, F. +4 more
Ongoing studies with XMM-Newton have shown that powerful accretion disc winds, as revealed through highly ionized Fe K-shell absorption at E ≥ 6.7 keV, are present in a significant fraction of active galactic nuclei (AGNs) in the local Universe (Tombesi et al. 2010a). In Gofford et al., we analysed a sample of 51 Suzaku-observed AGNs and independe…
Large-scale filaments associated with Milky Way spiral arms
Ginsburg, Adam; Wang, Ke; Testi, Leonardo +3 more
The ubiquity of filamentary structure at various scales throughout the Galaxy has triggered a renewed interest in their formation, evolution, and role in star formation. The largest filaments can reach up to Galactic scale as part of the spiral arm structure. However, such large-scale filaments are hard to identify systematically due to limitation…
Non-detection of X-ray emission from sterile neutrinos in stacked galaxy spectra
Bregman, Joel N.; Churazov, Eugene; Anderson, Michael E.
We conduct a comprehensive search for X-ray emission lines from sterile neutrino dark matter, motivated by recent claims of unidentified emission lines in the stacked X-ray spectra of galaxy clusters and the centres of the Milky Way and M31. Since the claimed emission lines lie around 3.5 keV, we focus on galaxies and galaxy groups (masking the ce…
Studying the YMC population of M83: how long clusters remain embedded, their interaction with the ISM and implications for GC formation theories
Bastian, N.; Ryon, J. E.; Adamo, A. +4 more
The study of young massive clusters can provide key information for the formation of globular clusters, as they are often considered analogues. A currently unanswered question in this field is how long these massive clusters remain embedded in their natal gas, with important implications for the formation of multiple populations that have been use…