Search Publications
Submillimetre and near-infrared observations of galaxies selected at 170 µm
Dole, H.; Lagache, G.; Puget, J. -L. +5 more
We present results from James Clerk Maxwell Telescope (JCMT) submillimetre (submm) observations of sources selected from the Infrared Space Observatory (ISO) FIRBACK (Far-infrared Background) survey, along with United Kingdom Infrared Telescope (UKIRT) near-infrared imaging of a subsample. This gives valuable insight into the brightest ~10 per cen…
The Orion nebula (M42) Herbig-Haro object, HH 201, within the tip of a molecular finger
Redman, M. P.; Meaburn, J.; Graham, M. F.
The most prominent Herbig-Haro (HH) object, HH 201, in the Orion nebula is investigated using optical spectroscopy along with optical and infrared images. An infrared Subaru H2v= 1-0 S(1) image of the region surrounding the optical line emission of HH 201 has yielded the discovery of a faint H2 finger associated with HH 201. …
TRIFFID observations of the cores of the three globular clusters M15, M92 and NGC 6712
Shearer, A.; Tuairisg, S. Ó.; Butler, R. F. +3 more
We present the results of TRIFFID simultaneous V- and B-band observations of the cores of the globular clusters M15, M92 and NGC 6712. A variability search of their dense centres was made feasible through performing post-exposure image sharpening on the images, increasing the image resolution by a factor of ~2. The ISIS implementation of the image…
The nature of X-ray selected extremely red objects
Ivison, R. J.; Smail, Ian; Page, M. J. +4 more
We report on the X-ray, optical, near-infrared, submillimetre and radio properties of five extremely red objects (EROs) selected at X-ray wavelengths by XMM-Newton in the Lockman Hole field. They all have enough counts in the X-ray band to allow spectral fitting: four are most probably obscured, Compton-thin active galactic nuclei (AGNs) with reds…
An analysis of the emission line spectra of AG Pegasi between phases 7.34 and 9.44
Contini, Marcella
The UV and optical spectra from the HST Faint Object Spectrograph and from the Fast Spectrograph for the Tillinghast Telescope (FAST) spectrograph at the Whipple Observatory reported by Kenyon, Proga & Keyes at different phases are analysed, leading to new results about the configuration of AG Pegasi. The FAST spectra contain both Hα and Hβ li…
Detection of type 2 quasars in the radio galaxies B3 0731+438 and 3C 257
O'Brien, P. T.; Reeves, J. N.; Ward, M. J. +3 more
We present XMM-Newton observations and spectral fitting of two high-redshift, [OIII]-luminous, narrow-line radio galaxies, B3 0731+438 and 3C 257. Their X-ray continua are well fitted by a partial covering model with intrinsically unabsorbed and absorbed power-law components. The spectral models indicate that both objects harbour highly obscured n…
Formation of bulges in very late-type galaxies from super star clusters
Deng, Z. G.; Fu, Y. N.; Huang, J. H.
The dynamical evolution of super star clusters (SSCs) moving in the background of a dark matter halo has been investigated as a possible event responsible for the formation of bulges in late-type spirals. The underlying physical processes include sinking of SSCs due to the dynamical friction and stripping of SSCs on their way to the centre. Our mo…
An XMM-Newton observation of the narrow-line Seyfert 1 galaxy Markarian 896
O'Brien, P. T.; Reeves, J. N.; Page, K. L. +1 more
We present XMM-Newton observations of the narrow-line Seyfert 1 galaxy Markarian 896. Over the 2-10 keV band, an iron emission line, close to 6.4 keV, is seen. The line is just resolved and has an equivalent width of ~170 eV. The broad-band spectrum is well modelled by a power-law slope of Γ~ 2.03, together with two blackbody components to fit the…
Stellar collisions in galactic centres: black hole growth and colour gradients
Yu, Qingjuan
We study the effects of stellar collisions, particularly on feeding massive black holes (BHs) and colour gradients, in realistic galactic centres. We find that the mass released by stellar collisions is not sufficient to account for the present BH mass in galactic centres, especially in bright galaxies. This study, together with the study by Magor…
A high-resolution radio study of neutral gas in the starburst galaxy NGC 520
Beswick, R. J.; Pedlar, A.; Clemens, M. S. +1 more
We present subarcsec angular resolution observations of the neutral gas in the nearby starburst galaxy NGC 520. The central kpc region of NGC 520 contains an area of significantly enhanced star formation. The radio continuum structure of this region resolves into ~10 continuum components. By comparing the flux densities of the brightest of these c…