Now showing items 1-12 of 12

    • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

      Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
      Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
    • Accretion discs as regulators of stellar angular momentum evolution in the ONC and Taurus-Auriga 

      Davies, Claire; Gregory, Scott; Greaves, Jane Sophia (2014-10-21) - Journal article
      In light of recent substantial updates to spectral type estimations and newly established intrinsic colours, effective temperatures, and bolometric corrections for pre-main sequence (PMS) stars, we re-address the theory ...
    • Can the removal of molecular cloud envelopes by external feedback affect the efficiency of star formation? 

      Lucas, William E.; Bonnell, Ian A.; Forgan, Duncan H. (2017-05) - Journal article
      We investigate how star formation efficiency can be significantly decreased by the removal of a molecular cloud’s envelope by feedback from an external source. Feedback from star formation has difficulties halting the ...
    • Continuum reverberation mapping of the accretion disks in two Seyfert 1 galaxies 

      Fausnaugh, M. M.; Starkey, D. A.; Horne, Keith; Kochanek, C. S.; Peterson, B. M.; Bentz, M. C.; Denney, K. D.; Grier, C. J.; Grupe, D.; Pogge, R. W.; De Rosa, G.; Adams, S. M.; Barth, A. J.; Beatty, Thomas G.; Bhattacharjee, A.; Borman, G. A.; Boroson, T. A.; Bottorff, M. C.; Brown, Jacob E.; Brown, Jonathan S.; Brotherton, M. S.; Coker, C. T.; Crawford, S. M.; Croxall, K. V.; Eftekharzadeh, Sarah; Eracleous, Michael; Joner, M. D.; Henderson, C. B.; Holoien, T. W. -S.; Hutchison, T.; Kaspi, Shai; Kim, S.; King, Anthea L.; Li, Miao; Lochhaas, Cassandra; Ma, Zhiyuan; MacInnis, F.; Manne-Nicholas, E. R.; Mason, M.; Montuori, Carmen; Mosquera, Ana; Mudd, Dale; Musso, R.; Nazarov, S. V.; Nguyen, M. L.; Okhmat, D. N.; Onken, ChristopherA; Ou-Yang, B.; Pancoast, A.; Pei, L.; Penny, Matthew T.; Poleski, Radosław; Rafter, Stephen; Romero-Colmenero, E.; Runnoe, Jessie; Sand, David J.; Schimoia, Jaderson S.; Sergeev, S. G.; Shappee, B. J.; Simonian, Gregory V.; Somers, Garrett; Spencer, M.; Stevens, Daniel J.; Tayar, Jamie; Treu, T.; Valenti, Stefano; Van Saders, J.; Villanueva Jr, S.; Villforth, C.; Weiss, Yaniv; Winkler, H.; Zhu, W. (2018-02-20) - Journal article
      We present optical continuum lags for two Seyfert 1 galaxies, MCG+08-11-011 and NGC 2617, using monitoring data from a reverberation mapping campaign carried out in 2014. Our light curves span the ugriz filters over four ...
    • Correlated X-ray/ultraviolet/optical variability in NGC 6814 

      Troyer, Jon; Starkey, David; Cackett, Edward M.; Bentz, Misty C.; Goad, Michael R.; Horne, Keith; Seals, James E. (2016-03-11) - Journal article
      We present results of a three-month combined X-ray/UV/optical monitoring campaign of the Seyfert 1 galaxy NGC 6814. The object was monitored by Swift from June through August 2012 in the X-ray and UV bands and by the ...
    • The dynamical fate of self-gravitating disc fragments after tidal downsizing 

      Forgan, D.; Parker, R.J.; Rice, K. (2015-02-11) - Journal article
      The gravitational instability model of planet/brown dwarf formation proposes that protostellar discs can fragment into objectswith masses above a few Jupiter masses at large semimajor axis. Tidal downsizing may reduce both ...
    • High-resolution Br γ spectro-interferometry of the transitional Herbig Ae/Be star HD 100546 : a Keplerian gaseous disc inside the inner rim 

      Mendigutía, I.; de Wit, W. J.; Oudmaijer, R. D.; Fairlamb, J. R.; Carciofi, A. C.; Ilee, J. D.; Vieira, R. G. (2015-10-21) - Journal article
      We present spatially and spectrally resolved Br γ emission around the planet-hosting, transitional Herbig Ae/Be star HD 100546. Aiming to gain insight into the physical origin of the line in possible relation to accretion ...
    • Investigating the inner discs of Herbig Ae/Be stars with CO bandhead and Brγ emission 

      Ilee, John D.; Fairlamb, John; Oudmaijer, Rene D.; Mendigutia, Ignacio; van den Ancker, Mario; Kraus, Stefan; Wheelwright, Hugh E. (2014-12-21) - Journal article
      Herbig Ae/Be stars lie in the mass range between low- and high-massyoung stars, and therefore offer a unique opportunity to observe anychanges in the formation processes that may occur across this boundary.This paper ...
    • The relation between accretion rates and the initial mass function in hydrodynamical simulations of star formation 

      Maschberger, T.; Bonnell, I.A.; Clarke, C.J.; Moraux, E. (2014-03-21) - Journal article
      We analyse a hydrodynamical simulation of star formation. Sink particles in the simulations which represent stars show episodic growth, which is presumably accretion from a core that can be regularly replenished in response ...
    • A spectroscopic survey of Herbig Ae/Be stars with X-shooter - I. Stellar parameters and accretion rates 

      Fairlamb, J. R.; Oudmaijer, R. D.; Mendigutía, I.; Ilee, John David; van den Ancker, M. E. (2015-10-11) - Journal article
      Herbig Ae/Be stars (HAeBes) span a key mass range that links low- and high-mass stars, and thus provide an ideal window from which to explore their formation. This paper presents Very Large Telescope/X-shooter spectra of ...
    • A systematic search for changing-look quasars in SDSS 

      MacLeod, Chelsea L.; Ross, Nicholas P.; Lawrence, Andy; Goad, Mike; Horne, Keith; Burgett, William; Chambers, Ken C.; Flewelling, Heather; Hodapp, Klaus; Kaiser, Nick; Magnier, Eugene; Wainscoat, Richard; Waters, Christopher (2016-03-21) - Journal article
      We present a systematic search for changing-look quasars based on repeat photometry from Sloan Digital Sky Survey (SDSS) and Pan-STARRS1, along with repeat spectra from SDSS and SDSS-III Baryon Oscillation Spectroscopic ...
    • The young low-mass star ISO-Oph-50 : extreme variability induced by a clumpy, evolving circumstellar disk 

      Scholz, Alexander; Muzic, Koraljka; Geers, Vincent (2015-07-21) - Journal article
      ISO-Oph-50 is a young low-mass object in the ∼1 Myr old Ophiuchus star-forming region undergoing dramatic changes in its optical/near/mid-infrared brightness by 2–4 mag. We present new multi-band photometry and near-infrared ...