Search Publications
Modelling of the surface emission of the low magnetic field magnetar SGR 0418+5729
Rea, N.; Perna, R.; Guillot, S. +2 more
We perform a detailed modelling of the post-outburst surface emission of the low magnetic field magnetar SGR 0418+5729. The dipolar magnetic field of this source, B=6 {× 10^{12}}{ G} estimated from its spin-down rate, is in the observed range of magnetic fields for normal pulsars. The source is further characterized by a high pulse fraction and a …
The velocity distribution in the solar neighbourhood from the LAMOST pilot survey
Zhang, Yong; Xu, Yan; Mao, Shude +5 more
We use about 15 000 F/G nearby dwarf stars selected from the LAMOST pilot survey to map the U-V velocity distribution in the solar neighbourhood. An extreme deconvolution algorithm is applied to reconstruct an empirical multi-Gaussian model. In addition to the well-known substructures, e.g. Sirius, Coma Berenices, Hyades-Pleiades overdensities, se…
Spectral models for early time SN 2011fe observations
Gal-Yam, A.; Wang, L.; Sullivan, M. +12 more
We use observed UV through near-IR spectra to examine whether SN 2011fe can be understood in the framework of Branch-normal Type Ia supernovae (SNe Ia) and to examine its individual peculiarities. As a benchmark, we use a delayed-detonation model with a progenitor metallicity of Z⊙/20. We study the sensitivity of features to variations …
Primordial alignment of elliptical galaxies in intermediate redshift clusters
Rong, Yu; Zhang, Shuang-Nan; Liao, Jin-Yuan
We measure primordial alignments for the red galaxies in the sample of eight massive galaxy clusters in the southern sky from the Cluster Lensing And Supernova survey with Hubble-Very Large Telescope (CLASH-VLT) Large Programme, at a median redshift of 0.375. We find primordial alignment with about 3σ significance in the four dynamically young clu…
The SLUGGS survey: globular cluster kinematics in a `double sigma' galaxy - NGC 4473
Spitler, Lee R.; Forbes, Duncan A.; Romanowsky, Aaron J. +6 more
NGC 4473 is a so-called double sigma (2σ) galaxy, i.e. a galaxy with rare, double peaks in its 2D stellar velocity dispersion. Here, we present the globular cluster (GC) kinematics in NGC 4473 out to ∼10Re (effective radii) using data from combined Hubble Space Telescope/Advanced Camera for Surveys and Subaru/Suprime-Cam imaging and Kec…
The relationship between polycyclic aromatic hydrocarbon emission and far-infrared dust emission from NGC 2403 and M83
Boquien, M.; Fritz, J.; Lebouteiller, V. +13 more
We examine the relation between polycyclic aromatic hydrocarbon (PAH) emission at 8 µm and far-infrared emission from hot dust grains at 24 µm and from large dust grains at 160 and 250 µm in the nearby spiral galaxies NGC 2403 and M83 using data from the Spitzer Space Telescope and Herschel Space Observatory. We find that the PAH…
Infrared identification of hard X-ray sources in the Galaxy
Motch, C.; Pineau, F. -X.; Carrera, F. J. +3 more
The nature of the low- to intermediate-luminosity (LX ∼ 1032-34 erg s-1) source population revealed in hard band (2-10 keV) X-ray surveys of the Galactic plane is poorly understood. To overcome such problem, we cross-correlated the XMM-Newton 3XMM-DR4 survey with the infrared Two Micron All Sky Survey and Galactic …
Observations of free-free and anomalous microwave emission from LDN 1622 with the 100 m Green Bank Telescope
Dickinson, C.; Cleary, K.; Harper, S. E.
LDN 1622 has previously been identified as a possible strong source of dust-correlated anomalous microwave emission (AME). Previous observations were limited by resolution meaning that the radio emission could not be compared with current generation high-resolution infrared data from Herschel, Spitzer or Wide-field Infrared Sky Explorer. This pape…
Far-infrared signatures and inner hole sizes of protoplanetary discs undergoing inside-out dust dispersal
Robitaille, Thomas; Owen, James; Ercolano, Barbara +1 more
By means of radiative transfer simulation, we study the evolution of the far-infrared colours of protoplanetary discs undergoing inside-out dispersal, often referred to as transition discs. We show that a brightening of the mid- and far-infrared emission from these objects is a natural consequence of the removal of the inner disc. Our results can …
Multiwavelength observations of NaSt1 (WR 122): equatorial mass loss and X-rays from an interacting Wolf-Rayet binary
Van Dyk, Schuyler D.; Smith, Nathan; Close, Laird M. +5 more
NaSt1 (aka Wolf-Rayet 122) is a peculiar emission-line star embedded in an extended nebula of [N II] emission with a compact dusty core. The object was previously characterized as a Wolf-Rayet (WR) star cloaked in an opaque nebula of CNO-processed material, perhaps analogous to η Car and its Homunculus nebula, albeit with a hotter central source. …