Search Publications
Progenitors and explosion properties of supernova remnants hosting central compact objects: I. RCW 103 associated with the peculiar source 1E 161348-5055
Fryer, C. L.; Safi-Harb, S.; Braun, C.
We present a Chandra and XMM-Newton imaging and spectroscopic study of the supernova remnant (SNR) RCW 103 (G332.4-00.4) containing the central compact object 1E 161348-5055. The high-resolution Chandra X-ray images reveal enhanced emission in the south-eastern and north-western regions. Equivalent width line images of Fe L, Mg, Si, and S using XM…
Study of the X-ray properties of the neutron star binary 4U 1728-34 from the soft-to-hard state
Motta, S. E.; Belloni, T. M.; Méndez, Mariano +7 more
We studied five XMM-Newton observations of the neutron star binary 4U 1728-34 covering the hard, intermediate and soft spectral states. By jointly fitting the spectra with several reflection models, we obtained an inclination angle of 25°-53° and an iron abundance up to 10 times the solar. From the fits with reflection models, we found that the fl…
A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959
Brunetti, G.; Shimwell, T. W.; Cassano, R. +9 more
The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, we present new detections of both a radio halo (with a spectral index of α _{143}^{1400}=1.48^{+0.06}_{-0.23}) and a likely ra…
A compact jet at the infrared heart of the prototypical low-luminosity AGN in NGC 1052
Tristram, K. R. W.; Prieto, M. A.; Asmus, D. +4 more
The feeble radiative efficiency characteristic of Low-Luminosity Active Galactic Nuclei (LLAGNs) is ascribed to a sub-Eddington accretion rate, typically at log (Lbol/Ledd) ≲ -3. At the finest angular resolutions that are attainable nowadays using mid-infrared (mid-IR) interferometry, the prototypical LLAGN in NGC 1052 remain…
Hyperluminous starburst gives up its secrets
Ivison, R. J.; Page, M. J.; Mainieri, V. +4 more
HATLAS J084933.4 + 021443 was identified as a dusty starburst via its rest-frame far-infrared (far-IR) emission. Multifrequency imaging and spectroscopy revealed a cluster of four dusty galaxies at z = 2.41, covering 80 kpc. Here, we use Atacama Large Millimetre Array to confirm a more distant, fifth protocluster member, and present X-ray and rest…
Rediscovering the tidal tails of NGC 288 with Gaia DR2
Carlberg, Raymond; Hunt, Jason A. S.; Webb, Jeremy J. +2 more
NGC 288 is a Galactic globular cluster having observed extra-tidal structure, without confirmed tidal tails. Gaia DR2 provides photometric and astrometric data for many of the stars in NGC 288 and its extra-tidal structure. To compare with the Gaia data, we simulate a N-body model of a star cluster with the same orbit as NGC 288 in a Milky Way pot…
Deep ALMA search for CO gas in the HD 95086 debris disc
MacGregor, Meredith A.; Hughes, A. Meredith; Wilner, David J. +7 more
One of the defining properties of debris discs compared to protoplanetary discs used to be their lack of gas, yet small amounts of gas have been found around an increasing number of debris discs in recent years. These debris discs found to have gas tend to be both young and bright. In this paper, we conduct a deep search for CO gas in the system H…
Eigenfunctions of Galactic phase space spirals from dynamic mode decomposition
Widrow, Lawrence M.; Darling, Keir
We investigate the spatiotemporal structure of simulations of the homogeneous slab and isothermal plane models for the vertical motion in the Galactic disc. We use dynamic mode decomposition (DMD) to compute eigenfunctions of the simulated distribution functions for both models, referred to as DMD modes. In the case of the homogeneous slab, we com…
K2-161b: a low-density super-Neptune on an eccentric orbit
Jones, M. I.; Cortés, C.; Rabus, M. +15 more
We report the discovery of K2-161b, which was first identified as a planetary candidate from Kepler K2 photometry of Campaign 14, and whose planetary nature and orbital parameters were then confirmed with precision radial velocities. K2-161b is half as massive as Saturn (M_P= 0.179 ± 0.021 MJ), and has a radius of R_P= 0.840 ± 0.011 R_J…
WASP-180Ab: Doppler tomography of a hot Jupiter orbiting the primary star in a visual binary
Bouchy, F.; Queloz, D.; Ségransan, D. +26 more
We report the discovery and characterization of WASP-180Ab, a hot Jupiter confirmed by the detection of its Doppler shadow and by measuring its mass using radial velocities. We find the 0.9 ± 0.1 MJup, 1.24 ± 0.04 RJup planet to be in a misaligned, retrograde orbit around an F7 star with Teff = 6500 K and a moderat…