Search Publications
The systematic search for z ≳ 5 active galactic nuclei in the Chandra Deep Field South
Schawinski, Kevin; Koss, Michael; Weigel, Anna K. +3 more
We investigate early black hole (BH) growth through the methodical search for z ≳ 5 active galactic nuclei (AGN) in the Chandra Deep Field South. We base our search on the Chandra 4-Ms data with flux limits of 9.1 × 10-18 (soft, 0.5-2 keV) and 5.5 × 10-17 erg s-1 cm-2 (hard, 2-8 keV). At z ∼ 5, this corr…
Revisiting the rigidly rotating magnetosphere model for σ Ori E - II. Magnetic Doppler imaging, arbitrary field RRM, and light variability
Owocki, S. P.; Wade, G. A.; Kochukhov, O. +6 more
The initial success of the Rigidly Rotating Magnetosphere (RRM) model application to the B2Vp star σ Ori E by Townsend, Owocki & Groote triggered a renewed era of observational monitoring of this archetypal object. We utilize high-resolution spectropolarimetry and the magnetic Doppler imaging (MDI) technique to simultaneously determine the mag…
The nature and origin of substructure in the outskirts of M31 - II. Detailed star formation histories
Lewis, Geraint F.; McConnachie, Alan W.; Ibata, Rodrigo A. +9 more
While wide-field surveys of M31 have revealed much substructure at large radii, understanding the nature and origin of this material is not straightforward from morphology alone. Using deep Hubble Space Telescope/Advanced Camera for Surveys data, we have derived further constraints in the form of quantitative star formation histories (SFHs) for 14…
The evolving relation between star formation rate and stellar mass in the VIDEO survey since z = 3
Vaccari, Mattia; Häußler, Boris; Jarvis, Matt +4 more
We investigate the star formation rate (SFR) and stellar mass, M*, relation of a star-forming (SF) galaxy (SFG) sample in the XMM-LSS field to z ∼ 3.0 using the near-infrared data from the VISTA Deep Extragalactic Observations (VIDEO) survey. Combining VIDEO with broad-band photometry, we use the SED fitting algorithm CIGALE to derive S…
The reversal of the SF-density relation in a massive, X-ray-selected galaxy cluster at z = 1.58: results from Herschel.
Altieri, B.; Elbaz, D.; Valtchanov, I. +8 more
Dusty, star-forming galaxies have a critical role in the formation and evolution of massive galaxies in the Universe. Using deep far-infrared imaging in the range 100-500 µm obtained with the Herschel telescope, we investigate the dust-obscured star formation (SF) in the galaxy cluster XDCP J0044.0-2033 at z = 1.58, the most massive cluster …
SN 2009ib: a Type II-P supernova with an unusually long plateau
Inserra, C.; Smartt, S. J.; Kankare, E. +18 more
We present optical and near-infrared photometry and spectroscopy of SN 2009ib, a Type II-P supernova in NGC 1559. This object has moderate brightness, similar to those of the intermediate-luminosity SNe 2008in and 2009N. Its plateau phase is unusually long, lasting for about 130 d after explosion. The spectra are similar to those of the subluminou…
Iron K and Compton hump reverberation in SWIFT J2127.4+5654 and NGC 1365 revealed by NuSTAR and XMM-Newton
Harrison, F. A.; Stern, D.; Zhang, W. W. +13 more
In the past five years, a flurry of X-ray reverberation lag measurements of accreting supermassive black holes have been made using the XMM-Newton telescope in the 0.3-10 keV energy range. In this work, we use the NuSTAR (Nuclear Spectroscopic Telescope Array) telescope to extend the lag analysis up to higher energies for two Seyfert galaxies, SWI…
Tracing the conversion of gas into stars in Young Massive Cluster Progenitors
Bastian, N.; Longmore, S. N.; Kruijssen, J. M. D. +5 more
Whilst young massive clusters (YMCs; M ≳ 104 M⊙, age ≲ 100 Myr) have been identified in significant numbers, their progenitor gas clouds have eluded detection. Recently, four extreme molecular clouds residing within 200 pc of the Galactic Centre have been identified as having the properties thought necessary to form YMCs. Her…
The origin of ultrafast outflows in AGN: Monte Carlo simulations of the wind in PDS 456
Done, Chris; Gandhi, Poshak; Takahashi, Tadayuki +4 more
Ultrafast outflows (UFOs) are seen in many AGN, giving a possible mode for AGN feedback on to the host galaxy. However, the mechanism(s) for the launch and acceleration of these outflows are currently unknown, with UV line driving apparently strongly disfavoured as the material along the line of sight is so highly ionized that it has no UV transit…
SN 2009ip at late times - an interacting transient at +2 years
Gilmore, Gerard; Fraser, Morgan; Elias-Rosa, Nancy +31 more
We present photometric and spectroscopic observations of the interacting transient SN 2009ip taken during the 2013 and 2014 observing seasons. We characterize the photometric evolution as a steady and smooth decline in all bands, with a decline rate that is slower than expected for a solely 56Co-powered supernova at late phases. No furt…