Search Publications
Revealing a Highly Dynamic Cluster Core in Abell 1664 with Chandra
Baum, Stefi A.; O'Dea, Christopher P.; McNamara, Brian R. +11 more
We present new, deep (245 ks) Chandra observations of the galaxy cluster Abell 1664 (z = 0.1283). These images reveal rich structure, including elongation and accompanying compressions of the X-ray isophotes in the NE-SW direction, suggesting that the hot gas is sloshing in the gravitational potential. This sloshing has resulted in cold fronts, at…
The white dwarf luminosity functions from the Pan-STARRS 1 3π Steradian Survey
Chambers, Kenneth C.; Magnier, Eugene A.; Wainscoat, Richard J. +9 more
A large sample of white dwarfs is selected by both proper motion and colours from the Pan-STARRS 1 3π Steradian Survey Processing Version 2 to construct the white dwarf luminosity functions of the discs and halo in the solar neighbourhood. Four-parameter astrometric solutions were recomputed from the epoch data. The generalized maximum volume meth…
Be and O in the ultra metal-poor dwarf 2MASS J18082002-5104378: the Be-O correlation
Bonifacio, P.; Caffau, E.; Spite, M. +3 more
Context. Measurable amounts of Be could have been synthesised primordially if the Universe were non-homogeneous or in the presence of late decaying relic particles.
Aims: We investigate the Be abundance in the extremely metal-poor star 2MASS J1808-5104 ([Fe/H] = -3.84) with the aim of constraining inhomogeneities or the presence of late decay…
Nuclear angular momentum of early-type galaxies hosting nuclear star clusters
Lyubenova, Mariya; Tsatsi, Athanassia
Context. Nucleation is a common phenomenon in all types of galaxies and at least 70% of them host nuclear star clusters (NSCs) in their centres. Many of the NSCs co-habit with supermassive black holes and follow similar scaling relations with host galaxy properties. Unlike black holes, NSCs, preserve the signature of their evolutionary path imprin…
High-drag Interstellar Objects and Galactic Dynamical Streams
Eubanks, T. M.
The nature of 1I/’Oumuamua (henceforth, 1I), the first interstellar object (ISO) known to pass through the solar system, remains mysterious. Feng & Jones noted that the incoming 1I velocity vector “at infinity” ({v}∞ ) is close to the motion of the Pleiades dynamical stream (or Local Association), and suggested that 1I is a young ob…
Properties of LBGs with [OIII] detection at z ∼ 3.5. The importance of including nebular emission data in SED fitting
Burgarella, Denis; Boquien, Médéric; Yuan, Fang-Ting +3 more
Context. Nebular emission lines are critical to measure physical properties in the ionized gas (e.g., metallicity, the star formation rate, or dust attenuation). They also account for a significant fraction of broadband fluxes, in particular at the highest redshifts, and therefore can strongly affect the determination of other physical properties,…
Exploring the damping of Alfvén waves along a long off-limb coronal loop, up to 1.4 R⊙
Mason, H. E.; Del Zanna, G.; Gupta, G. R.
The Alfvén wave energy flux in the corona can be explored using the electron density and velocity amplitude of the waves. The velocity amplitude of Alfvén waves can be obtained from the non-thermal velocity of spectral line profiles. Previous calculations of the Alfvén wave energy flux with height in active regions and polar coronal holes have pro…
Two years with comet 67P/Churyumov-Gerasimenko: H2O, CO2, and CO as seen by the ROSINA/RTOF instrument of Rosetta
Lasue, J.; Wurz, P.; Altwegg, K. +18 more
Context. The ESA Rosetta mission investigated the environment of comet 67P/Churyumov-Gerasimenko (hereafter 67P) from August 2014 to September 2016. One of the experiments on board the spacecraft, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) included a COmet Pressure Sensor (COPS) and two mass spectrometers to analyze the…
Elemental composition in quiescent prominences
Vial, J. -C.; Parenti, S.; Del Zanna, G.
Context. The first ionization potential (FIP) bias is currently used to trace the propagation of solar features ejected by the wind and solar eruptions (coronal mass ejections). The FIP bias also helps us to understand the formation of prominences, as it is a tracer for the solar origin of prominence plasma.
Aims: This work aims to provide el…
Extra-tidal structures around the Gaia Sausage candidate globular cluster NGC 6779 (M56)
Carballo-Bello, Julio A.; Piatti, Andrés E.
We present results on the stellar density radial profile of the outer regions of NGC 6779, a Milky Way globular cluster recently proposed as a candidate member of the Gaia Sausage structure, a merger remnant of a massive dwarf galaxy with the Milky Way. Taking advantage of the Pan-STARRS PS1 public astrometric and photometric catalogue, we built t…