Search Publications
Application of Double Beltrami states to solar eruptions
Kagan, D.; Mahajan, S. M.
We show that the general class of Double Beltrami (DB) states, which are the lowest energy equilibria of Hall magnetohydrodynamics, can have characteristics similar to those of active regions in the solar corona and is capable of undergoing a catastrophe that can cause a solar eruption, such as a flare or coronal mass ejection (CME). We then show …
Testing PDR models against ISO fine structure line data for extragalactic sources
Barlow, M. J.; Bell, T. A.; Viti, S. +2 more
Far-infrared [CII] 158-µm, [OI] 145-µm and [OI] 63-µm fine structure emission-line fluxes were measured from archival Infrared Space Observatory Long Wavelength Spectrometer spectra of 46 extragalactic sources, with 28 sources providing detections in all three lines. For 12 of the sources, the contribution to the [CII] 158-µ…
Near-infrared/optical identification of five low-luminosity X-ray pulsators
Paul, Biswajit; Wijnands, Rudy; Degenaar, Nathalie +2 more
We present the identification of the most likely near-infrared (NIR)/optical counterparts of five low-luminosity X-ray pulsators (AX J1700.1-4157, AX J1740.1-2847, AX J1749.2-2725, AX J1820.5-1434 and AX J1832.3-0840) which have long pulse periods (>150 s). The X-ray properties of these systems suggest that they are likely members of persistent…
Herschel-ATLAS: far-infrared properties of radio-selected galaxies
Rodighiero, G.; Ivison, R. J.; Clements, D. L. +41 more
We use the Herschel-Astrophysical Terahertz Large Area Survey (ATLAS) science demonstration data to investigate the star formation properties of radio-selected galaxies in the GAMA-9h field as a function of radio luminosity and redshift. Radio selection at the lowest radio luminosities, as expected, selects mostly starburst galaxies. At higher rad…
HerMES: Herschel-SPIRE observations of Lyman break galaxies
Aussel, H.; Elbaz, D.; Pérez-Fournon, I. +64 more
We present first results of a study of the submillimetre (submm) (rest-frame far-infrared) properties of z ~ 3 Lyman break galaxies (LBGs) and their lower redshift counterparts BX/BM galaxies, based on Herschel-SPIRE observations of the Northern field of the Great Observatories Origins Deep Survey (GOODS-N). We use stacking analysis to determine t…
A search for molecules in the atmosphere of HD 189733b
Pinfield, D. J.; Collier Cameron, A.; Barnes, J. R. +7 more
We use signal enhancement techniques and a matched filter analysis to search for the K-band spectroscopic absorption signature of the close orbiting extrasolar giant planet, HD 189733b. With time-series observations taken with the Near Infrared Spectrometer (NIRSPEC) at Keck II, we investigate the relative abundances of H2O and carbon b…
Proper motions and natures of First Byurakan Survey blue stellar objects
Mickaelian, A. M.; Sinamyan, P. K.
A new method for combined calculations of proper motions (PMs) based on accurate measurements of POSS1 and POSS2 epoch plates is given. The positional accuracy of various surveys and catalogues is estimated, and statistical weights for each of them are established. To achieve the best positions, weighted averaging of direct measurements on DSS1/DS…
Accretion disc in the eclipsing binary AU Mon
Djurašević, G.; Vince, I.; Latković, O. +1 more
We analyse the CoRoT and V-passband ground-based light curves of the interacting close binary AU Mon, assuming that there is a geometrically and optically thick accretion disc around the hotter and more massive star, as inferred from the photometric and spectroscopic characteristics of the binary. Our model fits the observations very well and prov…
A galaxy populations study of a radio-selected protocluster at z ~ 3.1
Pentericci, L.; Kajisawa, M.; Tanaka, I. +12 more
We present a population study of several types of galaxies within the protocluster surrounding the radio galaxy MRC 0316-257 at z ~ 3.1. In addition to the known population of Lyα emitters and [OIII] emitters, we use colour-selection techniques to identify protocluster candidates that are Lyman break galaxies (LBG) and Balmer break galaxies (BBGs)…
On the origin of M81 group extended dust emission
Elbaz, D.; Bock, J. J.; Clements, D. L. +57 more
Galactic cirrus emission at far-infrared wavelengths affects many extragalactic observations. Separating this emission from that associated with extragalactic objects is both important and difficult. In this paper we discuss a particular case, the M81 group, and the identification of diffuse structures prominent in the infrared, but also detected …