Search Publications
Dust in the outer layers of the Barnard 5 globule
Il'in, V. B.; Prokopjeva, M. S.; Efimov, Yu S. +2 more
We present the results of our UBVRI polarimetric observations of a dozen stars located close to the well-studied Bok globule Barnard 5 (B5), with several of the stars being seen through its outer layers (with AV up to ∼3 mag). Using recent astrometric, spectroscopic and photometric surveys, we estimate the distance, spectral class and v…
Dust in the eye of Andromeda
Smith, M. W. L.; Eales, S. A.; Marsh, K. A. +2 more
We present new Herschel-derived images of warm dust in the Andromeda galaxy, M31, with unprecedented spatial resolution (∼30 pc), column density accuracy, and constraints on the three-dimensional distributions of dust temperature and dust opacity index (hence grain size and composition), based on the new PPMAP Bayesian analysis procedure. We confi…
Sparse estimation of model-based diffuse thermal dust emission
Irfan, Melis O.; Bobin, Jérôme
Component separation for the Planck High Frequency Instrument (HFI) data is primarily concerned with the estimation of thermal dust emission, which requires the separation of thermal dust from the cosmic infrared background (CIB). For that purpose, current estimation methods rely on filtering techniques to decouple thermal dust emission from CIB a…
Improving catalogue matching by supplementing astrometry with additional photometric information
Wilson, Tom J.; Naylor, Tim
The matching of sources between photometric catalogues can lead to cases where objects of differing brightness are incorrectly assumed to be detections of the same source. The rejection of unphysical matches can be achieved through the inclusion of information about the sources' magnitudes. The method described here uses the additional photometric…
Bright compact bulges at intermediate redshifts
Sachdeva, Sonali; Saha, Kanak
Studying bright (MB < -20), intermediate-redshift (0.4 < z< 1.0), disc-dominated (nB < 2.5) galaxies from Hubble Space Telescope/Advanced Camera for Surveys and Wide Field Camera 3 in Chandra Deep Field-South, in rest-frame B and I band, we found a new class of bulges that is brighter and more compact than ellipti…
Dawn-dusk asymmetry induced by the Parker spiral angle in the plasma dynamics around comet 67P/Churyumov-Gerasimenko
Behar, E.; Nilsson, H.; Tabone, B.
The solar wind and the ionized atmosphere of a comet, exchange energy and momentum on interacting. Our aim is to understand the influence of the average Parker spiral configuration of the solar wind magnetic field on this interaction. We compare the theoretical expectations of an analytical generalized gyromotion with Rosetta observations at comet…
Galactic cartography with SkyMapper - I. Population substructure and the stellar number density of the inner halo
Lewis, Geraint F.; Sharma, Sanjib; Ibata, Rodrigo A. +3 more
The stars within our Galactic halo presents a snapshot of its ongoing growth and evolution, probing galaxy formation directly. Here, we present our first analysis of the stellar halo from detailed maps of Blue Horizontal Branch (BHB) stars drawn from the SkyMapper Southern Sky Survey. To isolate candidate BHB stars from the overall population, we …
First Extended Catalogue of Galactic bubble infrared fluxes from WISE and Herschel surveys
Umana, G.; Riggi, S.; Trigilio, C. +8 more
In this paper, we present the first extended catalogue of far-infrared fluxes of Galactic bubbles. Fluxes were estimated for 1814 bubbles, defined here as the 'golden sample', and were selected from the Milky Way Project First Data Release (Simpson et al.) The golden sample was comprised of bubbles identified within the Wide-field Infrared Survey …
IRAS 22150+6109 - a young B-type star with a large disc
Zakhozhay, Olga V.; Manset, Nadine; Miroshnichenko, Anatoly S. +4 more
We present the results of a spectroscopic analysis and spectral energy distribution (SED) modelling of the optical counterpart of the infrared source IRAS 22150+6109. The source was suggested to be a Herbig Be star located in the star-forming region L 1188. Absorption lines in the optical spectrum indicate a spectral type B3, while weak Balmer emi…
NuSTAR view of the central region of M31
Stiele, H.; Kong, A. K. H.
Our neighbouring large spiral galaxy, the Andromeda galaxy (M31 or NGC 224), is an ideal target to study the X-ray source population of a nearby galaxy. NuSTAR observed the central region of M31 in 2015 and allows studying the population of X-ray point sources at energies higher than 10 keV. Based on the source catalogue of the large XMM-Newton su…