Search Publications
Generalized anisotropic κ-cookbook: 2D fitting of Ulysses electron data
Fichtner, H.; Scherer, K.; Lazar, M. +1 more
Observations in space plasmas reveal particle velocity distributions out of thermal equilibrium, with anisotropies (e.g. parallel drifts and/or different temperatures, T∥ - parallel and T⊥ - perpendicular, with respect to the background magnetic field), and multiple quasi-thermal and suprathermal populations with different pr…
Spectroscopic and photometric time series of the bright RRc star T Sex
Pál, András; Sódor, Ádám; Benkő, József M.
We present spectroscopic time series observations on one of the brightest northern RRc stars, namely T Sex. Additionally, we also analysed extended photometric data sets, particularly the recent observations of the TESS space telescope. The main findings of our studies are as follows: T Sex, unlike all RRc stars whose space photometry has been ana…
Absence of obvious tidal tails around the globular cluster NGC 6397
Vitral, Eduardo; Boldrini, Pierre
In this work, we use N-body simulations performed on GPU to trace the past 10 Gyr dynamical history of a globular cluster (GC) similar to NGC 6397 in the tidal field of a Milky Way-like galaxy and we compare our simulated GCs with data from the third Gaia early data release. Our simulations predict, in contrast to what is deduced from the data, th…
The MOSDEF survey: differences in SFR and metallicity for morphologically selected mergers at z ∼ 2
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +15 more
We study the properties of 55 morphologically-identified merging galaxy systems at z ~ 2. These systems are flagged as mergers based on features such as tidal tails, double nuclei, and asymmetry. Our sample is drawn from the MOSFIRE Deep Evolution Field (MOSDEF) survey, along with a control sample of isolated galaxies at the same redshift. We cons…
Absorption-selected galaxies trace the low-mass, late-type, star-forming population at z 2-3
Valentino, F.; Fynbo, J. P. U.; Christensen, L. +5 more
We report on the stellar content, half-light radii and star formation rates of a sample of 10 known high-redshift (z ≳ 2) galaxies selected on strong neutral hydrogen (H I) absorption ($\log ({\rm N_{H\, \rm {I}}\: /\: cm}^{-2})\,\gt\, 19$) towards background quasars. We use observations from the Hubble Space Telescope Wide Field Camera 3 in three…
Resolved spectral variations of the centimetre-wavelength continuum from the ρ Oph W photodissociation region
Hensley, Brandon; Casassus, Simon; White, Glenn J. +5 more
Centimetre-wavelength radio continuum emission in excess of free-free, synchrotron, and Rayleigh-Jeans dust emission (excess microwave emission, EME), and often called 'anomalous microwave emission', is bright in molecular cloud regions exposed to UV radiation, i.e. in photodissociation regions (PDRs). The EME correlates with infrared (IR) dust em…
The relationship between gas and galaxies at z < 1 using the Q0107 quasar triplet
Tejos, Nicolas; Beckett, Alexander; Morris, Simon L. +5 more
We study the distribution and dynamics of the circumgalactic and intergalactic medium using a dense galaxy survey covering the field around the Q0107 system, a unique z ≈ 1 projected quasar triplet. With full Ly α coverage along all three lines-of-sight from z = 0.18 to z = 0.73, more than 1200 galaxy spectra, and two MUSE fields, we examine the s…
Multiwavelength detectability of isolated black holes in the Milky Way
Bertone, Gianfranco; Connors, Riley; Ricotti, Massimo +3 more
Isolated black holes in our Galaxy have eluded detection so far. We present here a comprehensive study on the detectability of isolated stellar-mass astrophysical black holes that accrete interstellar gas from molecular clouds in both the local region and the Central Molecular Zone. We adopt a state-of-the-art model for the accretion physics backe…
Intrinsic metallicity variation in the intermediate mass type II globular cluster NGC 1261
Sarajedini, Ata; Monaco, L.; Geisler, D. +5 more
Globular Clusters (GCs) are now well known to almost universally show multiple populations (MPs). The HST UV Legacy Survey of a large number of Galactic GCs in UV filters optimized to explore MPs finds that a small fraction of GCs, termed Type II, also display more complex, anomalous behaviour. Several well-studied Type II GCs show intrinsic Fe ab…
Detection of an extremely strong magnetic field in the double-degenerate binary merger product HD 144941
Owocki, S. P.; Shultz, M. E.; Kochukhov, O. +2 more
HD 144941 is an extreme He (EHe) star, a rare class of subdwarf OB star formed from the merger of two white dwarf (WD) stars. Uniquely amongst EHe stars, its light curve has been reported to be modulated entirely by rotation, suggesting the presence of a magnetic field. Here, we report the first high-resolution spectropolarimetric observations of …