Search Publications
The way to a double degenerate: ∼15-20 per cent of 1 M⊙ ≤ M ≤ 8 M⊙ stars have an M > 1 M⊙ companion
Klein, Ygal Y.; Katz, Boaz
We find that ∼15-20 per cent of A-type stars or red giants are bound with a massive companion (Msecondary > 1 M⊙) in an intermediate wide orbit (0.5 < P < 5000 yr). These massive binaries are expected to form wide-orbit, double-degenerate systems (WODDs) within ≲10 Gyr implying that ∼10 per cent of white dwarfs (WDs)…
Spectral and time series analyses of the Seyfert 1 AGN: Zw 229.015
Rakshit, Suvendu; Adegoke, Oluwashina; Mukhopadhyay, Banibrata
We analyse the spectra of the archival XMM-Newton data of the Seyfert 1 AGN Zw 229.015 in the energy range 0.3-10.0 keV. When fitted with a simple power law, the spectrum shows signatures of weak soft excess below 1.0 keV. We find that both thermal Comptonization and relativistically blurred reflection models provide the most acceptable spectral f…
OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2 - III. Galaxy properties across projected phase space in A901/2
Chies-Santos, Ana L.; Wolf, Christian; Aragón-Salamanca, Alfonso +6 more
We conduct a comprehensive projected phase-space analysis of the A901/2 multicluster system at z ∼ 0.165. Aggregating redshifts from spectroscopy, tunable-filter imaging and prism techniques, we assemble a sample of 856 cluster galaxies reaching 108.5 M⊙ in stellar mass. We look for variations in cluster galaxy properties bet…
Rotationally modulated variability and pulsations of the He-rich star CPD -62°2124 with an extraordinarily strong magnetic field
Ilyin, I.; Hubrig, S.; Zejda, M. +5 more
A longitudinal magnetic field with a strength of 5.2 kG was recently detected in CPD -62°2124, which has a fractional main-sequence lifetime of about 60 per cent. Strongly magnetic early-B type chemically peculiar stars in an advanced evolutionary state are of special interest to understand the evolution of the angular momentum and spin-down time-…
The growth of typical star-forming galaxies and their supermassive black holes across cosmic time since z ∼ 2
Smail, Ian; Sobral, David; Harrison, Chris +5 more
Understanding galaxy formation and evolution requires studying the interplay between the growth of galaxies and the growth of their black holes across cosmic time. Here, we explore a sample of Hα-selected star-forming galaxies from the High Redshift Emission Line Survey and use the wealth of multiwavelength data in the Cosmic Evolution Survey fiel…
Search for very high-energy gamma-ray emission from the microquasar Cygnus X-1 with the MAGIC telescopes
Maraschi, L.; Covino, S.; Antonelli, L. A. +144 more
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black hole transient. During the latter, Cygnus X-1 shows a one-sided relativistic radio-jet. Recent detection of the system in the high energy (HE; E ≳ 60 MeV) gamma-ray range with Fermi-LAT associates this emission with the outflow. Former MAGIC observations reve…
Thermophysical characteristics of the large main-belt asteroid (349) Dembowska
Ip, Wing-Huen; Yu, Liang Liang; Ji, Jianghui +1 more
(349) Dembowska is a large, bright main-belt asteroid that has a fast rotation and an oblique spin axis. It might have experienced partial melting and differentiation. We constrain Dembowska's thermophysical properties, such as thermal inertia, roughness fraction, geometric albedo and effective diameter within 3σ uncertainty of Γ =20^{+12}_{-7} Jm…
Near-periodical spin period evolution in the binary system LMC X-4
Tsygankov, S.; Lutovinov, A.; Molkov, S. +2 more
In this paper, we investigated the long-term evolution of the pulse period in the high-mass X-ray binary LMC X-4 by taking advantage of more than 43 yr of measurements in the X-ray domain. Our analysis revealed for the first time that the source is displaying near-periodical variations of its spin period on a time-scale of roughly 6.8 yr, making L…
Characterizing dw1335-29, a recently discovered dwarf satellite of M83
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +4 more
The number, distribution and properties of dwarf satellites are crucial probes of the physics of galaxy formation at low masses and the response of satellite galaxies to the tidal and gas dynamical effects of their more massive parent. To make progress, it is necessary to augment and solidify the census of dwarf satellites of galaxies outside the …
Pushing the limits: detecting H2 emission from faint bipolar planetary nebulae in the IPHAS sample
Guerrero, M. A.; Santamaría, E.; Ramos-Larios, G. +1 more
We have obtained deep narrowband images in the near-infrared H2 λ2.122 µm emission line for a sample of 15 faint Isaac Newton Telescope Photometric H α Survey (IPHAS) bipolar planetary nebulae (PNe) to search for molecular material. H2 emission is found in most of them (14 out of 15), mostly associated with rings at the…