Search Publications
The rise and fall of the UV upturn: z = 0.3, 0.55, and 0.7
Bremer, M. N.; De Propris, R.; Phillipps, S. +1 more
We have analysed the strength of the ultraviolet (UV) upturn in red sequence galaxies with luminosities reaching to below the L* point within four clusters at z = 0.3, 0.55, and 0.7. We find that the incidence and strength of the upturn remains constant up to z = 0.55. In comparison, the prevalence and strength of the UV upturn is significantly di…
Probing star formation and ISM properties using galaxy disk inclination. I. Evolution in disk opacity since z 0.7
Smolčić, V.; Sargent, M. T.; Schinnerer, E. +6 more
Disk galaxies at intermediate redshift (z 0.7) have been found in previous work to display more optically thick behaviour than their local counterparts in the rest-frame B-band surface brightness, suggesting an evolution in dust properties over the past 6 Gyr. We compare the measured luminosities of face-on and edge-on star-forming galaxies at dif…
X-Ray Variability from the Ultraluminous Black Hole Candidate X-Ray Binary in the Globular Cluster RZ 2109
Kundu, Arunav; Dage, Kristen C.; Zepf, Stephen E. +3 more
We present the results of long-term monitoring of the X-ray emission from the ultraluminous X-ray source XMMU J122939.9+075333 in the extragalactic globular cluster RZ2109. The combination of the high X-ray luminosity, short-term X-ray variability, X-ray spectrum, and optical emission suggests that this system is likely an accreting black hole in …
The Cosmic Web around the Brightest Galaxies during the Epoch of Reionization
Trenti, Michele; Mutch, Simon J.; Ren, Keven
The most luminous galaxies at high redshift are generally considered to be hosted in massive dark-matter halos of comparable number density, hence residing at the center of over-densities/protoclusters. We assess the validity of this assumption by investigating the clustering around the brightest galaxies populating the cosmic web at redshift z ∼ …
Ultraviolet Observations of Coronal Mass Ejection Impact on Comet 67P/Churyumov-Gerasimenko by Rosetta Alice
Parker, Joel Wm.; Bertaux, Jean-Loup; Stern, S. Alan +13 more
The Alice ultraviolet spectrograph on the European Space Agency Rosetta spacecraft observed comet 67P/Churyumov-Gerasimenko in its orbit around the Sun for just over two years. Alice observations taken in 2015 October, two months after perihelion, show large increases in the comet’s Lyβ, O I 1304, O I 1356, and C I 1657 Å atomic emission that init…
Measuring the Galactic Cosmic Ray flux with the LISA Pathfinder radiation monitor
Mendes, L.; Russano, G.; Lloro, I. +76 more
Test mass charging caused by cosmic rays will be a significant source of acceleration noise for space-based gravitational wave detectors like LISA. Operating between December 2015 and July 2017, the technology demonstration mission LISA Pathfinder included a bespoke monitor to help characterise the relationship between test mass charging and the l…
Gaia Data Release 2. Short-timescale variability processing and analysis
Audard, M.; Rimoldini, L.; Holl, B. +13 more
Aims: We describe the methods used and the analysis performed in the frame of the Gaia data processing activities to produce the Gaia Data Release 2 (DR2) sample candidates with short-timescale variability together with associated parameters.
Methods: The Gaia DR2 sample of candidates with short-timescale variability results from the inv…
Ion Acceleration by Flux Transfer Events in the Terrestrial Magnetosheath
Vainio, R.; Palmroth, M.; Turc, L. +6 more
We report ion acceleration by flux transfer events in the terrestrial magnetosheath in a global two-dimensional hybrid-Vlasov polar plane simulation of Earth's solar wind interaction. In the model we find that propagating flux transfer events created in magnetic reconnection at the dayside magnetopause drive fast-mode bow waves in the magnetosheat…
A detailed X-ray investigation of ζ Puppis. IV. Further characterization of the variability
Moffat, Anthony F. J.; Stevens, Ian R.; Nazé, Yaël +2 more
Context. One of the optically brightest and closest massive stars, ζ Pup, is also a bright X-ray source. Previously, its X-ray emission was found to be variable with light curves harbouring "trends" with a typical timescale longer than the exposure length, i.e. >1 d. The origin of these changes was proposed to be linked to large-scale structure…
Correlations between age, kinematics, and chemistry as seen by the RAVE survey
Grebel, Eva K.; Steinmetz, Matthias; Bland-Hawthorn, Joss +20 more
We explore the connections between stellar age, chemistry, and kinematics across a Galactocentric distance of 7.5 < R(kpc) < 9.0, using a sample of ∼12 000 intermediate-mass (FGK) turn-off stars observed with the RAdial Velocity Experiment (RAVE) survey. The kinematics of this sample are determined using radial velocity measurements from RAV…