Search Publications
Partially-erupting prominences: a comparison between observations and model-predicted observables
Mason, H. E.; Fletcher, L.; Qiu, J. +4 more
Aims: We investigate several partially-erupting prominences to study their relationship with other CME-associated phenomena and compare these observations with observables predicted by a model of partially-expelled-flux-ropes (Gibson & Fan 2006a, ApJ, 637, L65; 2006b, J. Geophys. Res., 111, 12103).
Methods: We studied 6 selected events wit…
The Young, Massive, Star Cluster Sandage-96 After the Explosion of Supernova 2004dj in NGC 2403
Filippenko, A. V.; Brown, P. J.; Foley, R. J. +12 more
The bright Type II-plateau supernova (SN) 2004dj occurred within the young, massive stellar cluster Sandage-96 in a spiral arm of NGC 2403. New multiwavelength observations obtained with several ground-based and space-based telescopes were combined to study the radiation from Sandage-96 after SN 2004dj faded away. Sandage-96 started to dominate th…
The Seyfert AGN RX J0136.9-3510 and the spectral state of super Eddington accretion flows
Done, Chris; Ward, Martin; Gierliński, Marek +2 more
We have carried out a survey of long 50 ks XMM-Newton observations of a sample of bright, variable active galactic nuclei (AGN). We found a distinctive energy dependence of the variability in RX J0136.9-3510 where the fractional variability increases from 0.3 to 2 keV, and then remains constant. This is in sharp contrast to other AGN where the X-r…
GEMINI 3D spectroscopy of BAL + IR + FeII QSOs - I. Decoupling the BAL, QSO, starburst, NLR, supergiant bubbles and galactic wind in Mrk 231
Taniguchi, Y.; Jahnke, K.; Zheng, W. +9 more
In this paper we present the first results of a study of BAL QSOs (at low and high redshift), based on very deep Gemini GMOS integral field spectroscopy. In particular, the results obtained for the nearest BAL IR-QSO Mrk 231 are presented.
For the nuclear region of Mrk 231, the QSO and host galaxy components were modelled, using a new techniq…North Ecliptic Pole Wide Field Survey of AKARI: Survey Strategy and Data Characteristics
Kim, Seong Jin; Nakagawa, Takao; Oyabu, Shinki +10 more
We present the survey strategy and the data characteristics of the North Ecliptic Pole (NEP) Wide Survey of AKARI. The survey was carried out for about one year starting from 2006 May with 9 passbands from 2.5 to 24µm and the areal coverage of about 5.8degree² centered on NEP. The survey depth reaches to 21.8 AB magnitude near infrared (NIR)…
Suzaku Observations of SS Cygni in Quiescence and Outburst
Hamaguchi, Kenji; Ishida, Manabu; Hayashi, Takayuki +4 more
We present results from the Suzaku observations of the dwarf nova SS Cyg in quiescence and outburst in 2005 November. The high sensitivity of the HXD PIN and the high spectral resolution of the XIS enabled us to determine the plasma parameters with unprecedented precision. The maximum temperature of the plasma in quiescence, 20.4+4.0
The Growth of Black Holes: Insights from Obscured Active Galaxies
Ho, Luis C.; Barth, Aaron J.; Greene, Jenny E. +2 more
Obscured or narrow-line active galaxies offer an unobstructed view of the quasar environment in the presence of a luminous and vigorously accreting black hole (BH). We exploit the large new sample of optically selected luminous narrow-line active galaxies from the Sloan Digital Sky Survey at redshifts 0.1 < z < 0.45, in conjunction with foll…
Characteristics of Saturn's polar atmosphere and auroral electrons derived from HST/STIS, FUSE and Cassini/UVIS spectra
Feldman, P. D.; Gérard, J. -C.; Grodent, D. +3 more
Ultraviolet (UV) spectra of Saturn's aurora obtained with the Hubble Space Telescope Imaging Spectrograph (STIS), the Cassini Ultraviolet Imaging Spectrograph (UVIS) and the Far Ultraviolet Spectroscopic Explorer (FUSE) have been analyzed. Comparisons between the observed spectra and synthetic models of electron-excited H 2 have been us…
Hunting high and low: XMM monitoring of the eclipsing polar HU Aquarii
Dhillon, V. S.; Marsh, T. R.; Littlefair, S. P. +5 more
Aims: We want to study the temporal and spectral behaviour of HU Aqr in the X-ray domain during different accretion states.
Methods: We obtained spectra and light curves from four different XMM-Newton pointings covering intermediate and low states. The X-ray observations were accompanied with high time resolution photometry obtained with the O…
The Jet Heated X-Ray Filament in the Centaurus A Northern Middle Radio Lobe
Hardcastle, M. J.; Croston, J. H.; Birkinshaw, M. +6 more
We present results from a 40 ks XMM-Newton observation of the X-ray filament coincident with the southeast edge of the Centaurus A Northern Middle Radio Lobe (NML). We find that the X-ray filament consists of five spatially resolved X-ray knots embedded in a continuous diffuse bridge. The spectrum of each knot is well fitted by a thermal model wit…