Search Publications
The cosmic-ray content of the Orion-Eridanus superbubble
Casandjian, J. M.; Grenier, I. A.; Schlickeiser, R. +2 more
Aims: The nearby Orion-Eridanus superbubble, which was blown by multiple supernovae several million years ago, has likely produced cosmic rays. Its turbulent medium is still energised by massive stellar winds and it can impact cosmic-ray transport locally. The γ radiation produced in interactions between cosmic rays and interstellar gas can b…
The properties of radio and mid-infrared detected galaxies and the effect of environment on the co-evolution of AGN and star formation at z ∼ 1
Shen, Lu; Wu, Po-Feng; Fassnacht, Christopher D. +10 more
In this study, we investigate 179 radio-infrared (IR) galaxies drawn from a sample of spectroscopically confirmed galaxies, which are detected in radio and mid-IR (MIR) in the redshift range of 0.55 ≤ z ≤ 1.30 in the Observations of Redshift Evolution in Large Scale Environments (ORELSE) survey. We constrain the active galactic nuclei (AGN) contri…
The population of rotational fission clusters inside asteroid collisional families
Spoto, F.; Carruba, V.; Aljbaae, S. +3 more
Asteroid families are groups of objects sharing similar orbits. They are mostly the results of past collisions between two asteroids. Recent studies have shown that some asteroid families can also be the outcome of the spin-up-induced fission of a critically rotating parent body (fission clusters). In at least four young fission clusters, more tha…
Identification of 3XMM J000511.8+634018 as a new polar at Porb = 133.5 min - is it inside or outside the period gap?
Webb, N. A.; Guillot, S.; Schwope, A. D. +2 more
Aims: We aimed to identify the variable X-ray source 3XMM J000511.8+634018, which was serendipitously discovered through routine inspections while the 3XMM catalogue was compiled.
Methods: We analysed the archival XMM-Newton observation of the source, obtained BUSCA photometry in three colours, and performed optical spectroscopy with the…
Distance mapping applied to four well-known planetary nebulae and a nova shell
Gonçalves, Denise R.; Akras, Stavros; Steffen, Wolfgang +1 more
Accurate distance estimates of astrophysical objects such as planetary nebulae (PNe), and nova and supernova remnants, among others, allow us to constrain their physical characteristics, such as size, mass, luminosity, and age. An innovative technique based on the expansion parallax method, the so-called distance mapping technique (DMT), provides …
A complex storm system in Saturn's north polar atmosphere in 2018
Hueso, R.; Sánchez-Lavega, A.; Simon, A. A. +15 more
Saturn's convective storms usually fall in two categories. One consists of mid-sized storms ∼2,000 km wide, appearing as irregular bright cloud systems that evolve rapidly, on scales of a few days. The other includes the Great White Spots, planetary-scale giant storms ten times larger than the mid-sized ones, which disturb a full latitude band, en…
A single galaxy population? Statistical evidence that the star-forming main sequence might be the tip of the iceberg
Ascasibar, Y.; López-Sánchez, Á. R.; Corcho-Caballero, P.
According to their specific star formation rate (sSFR), galaxies are often divided into 'star-forming' and 'passive' populations. It is argued that the former define a narrow 'main sequence of star-forming galaxies' (MSSF) of the form sSFR(M*), whereas 'passive' galaxies feature negligible levels of star formation activity. Here we use …
The stringent upper limit on jet power in the persistent soft-state source 4U 1957+11
Maccarone, Thomas J.; McHardy, Ian M.; Miller-Jones, James C. A. +5 more
We present extremely deep upper limits on the radio emission from 4U 1957+11, an X-ray binary that is generally believed to be a persistently accreting black hole that is almost always in the soft state. We discuss a more comprehensive search for Type I bursts than in past work, revealing a stringent upper limit on the burst rate, bolstering the c…
K2 observations of the pulsating subdwarf B stars UY Sex and V1405 Ori
Reed, M. D.; Jeffery, C. S.; Baran, A. S. +5 more
We processed and analysed K2 observations of the pulsating subdwarf-B (sdBV) stars UY Sex and V1405 Ori. We detect 97 p-mode pulsations in UY Sex while we discover V1405 Ori to be a rare rich hybrid pulsator with over 100 p-mode pulsations and 19 g-mode pulsations. We detect frequency multiplets, which we use to identify pulsation modes as well as…
High-amplitude γ Doradus variables
Paunzen, Ernst; Hambsch, Franz-Josef; Hümmerich, Stefan +3 more
According to most literature sources, the amplitude of the pulsational variability observed in γ Doradus stars does not exceed 0.1 mag in Johnson V. We have analysed fifteen high-amplitude γ Doradus stars with photometric peak-to-peak amplitudes well beyond this limit, with the aim of unraveling the mechanisms behind the observed high amplitudes a…