Search Publications
Missions
Journals
Publication Years
The discrepancy between dynamical and theoretical mass in the triplet-system 2MASS J10364483+1521394
Henning, Thomas; Brandner, Wolfgang; Calissendorff, Per +6 more
We combine new Lucky Imaging astrometry from New Technology Telescope/AstraLux Sur with already published astrometry from the AstraLux Large M-dwarf Multiplicity Survey to compute orbital elements and individual masses of the 2MASS J10364483+1521394 triple system belonging to the Ursa-Major moving group. The system consists of one primary low-mass…
A hard-to-soft state transition of Aquila X-1 observed with Suzaku
Yamaoka, Kazutaka; Makishima, Kazuo; Nakazawa, Kazuhiro +3 more
The recurrent soft X-ray transient Aquila X-1 was observed with Suzaku for a gross duration of 79.9 ks, on 2011 October 21 when the object was in a rising phase of an outburst. During the observation, the source exhibited a clear spectral transition from the hard state to the soft state, on a time scale of ∼30 ks. Across the transition, the 0.8-10…
The Canonical Luminous Blue Variable AG Car and Its Neighbor Hen 3-519 are Much Closer than Previously Assumed
Smith, Nathan; Stassun, Keivan G.
The strong mass loss of Luminous Blue Variables (LBVs) is thought to play a critical role in massive-star evolution, but their place in the evolutionary sequence remains debated. A key to understanding their peculiar instability is their high observed luminosities, which often depends on uncertain distances. Here we report direct distances and spa…
Identification of IGR J01217-7257 with the transient SMC pulsar XTE J0119-731 (SXP 2.16) using XMM-Newton
Haberl, F.; Vasilopoulos, G.; Maggi, P.
The transient IGR J01217-7257 in the Small Magellanic Cloud was found to be in a new outburst during INTEGRAL observations. We triggered an XMM-Newton target of opportunity observation near outburst maximum, which lead to the discovery of X-ray pulsations with a period of 2.165 s. This period is very similar to that detected from XTE J0119-731, su…
The challenging task of determining star formation rates: the case of a massive stellar burst in the brightest cluster galaxy of Phoenix galaxy cluster
McDonald, M.; Bruzual, Gustavo; Mittal, Rupal +1 more
Star formation in galaxies at the centre of cooling-flow galaxy clusters is an important phenomenon in the context of formation and evolution of massive galaxies in the Universe. Yet, star formation rates (SFRs) in such systems continue to be elusive. We use our Bayesian-motivated spectral energy distribution (SED)-fitting code, BAYESCOOL, to esti…
Coherently modulated whistler mode waves simultaneously observed over unexpectedly large spatial scales
Ma, Qianli; Li, Jinxing; Kletzing, Craig A. +10 more
Utilizing simultaneous twin Van Allen Probes observations of whistler mode waves at variable separations, we are able to distinguish the temporal variations from spatial variations, determine the coherence spatial scale, and suggest the possible mechanism of wave modulation. The two probes observed coherently modulated whistler mode waves simultan…
Rearrangements of Open Magnetic Flux and Formation of Polar Coronal Holes in Cycle 24
Golubeva, E. M.; Mordvinov, A. V.
A method of synoptic map assimilation has been developed to study global rearrangements of open magnetic flux and formation of polar coronal holes (PCHs) in the current cycle. The analysis reveals ensembles of coronal holes (ECHs) that appear within unipolar magnetic regions associated with decaying activity complexes (ACs). The cause-effect relat…
NuSTAR Hard X-Ray Observation of the Gamma-Ray Binary Candidate HESS J1832-093
Hailey, Charles J.; Mori, Kaya; Gotthelf, E. V. +13 more
We present a hard X-ray observation of the TeV gamma-ray binary candidate HESS J1832-093, which is coincident with the supernova remnant G22.7-0.2, using the Nuclear Spectroscopic Telescope Array. Non-thermal X-ray emission from XMMU J183245-0921539, the X-ray source associated with HESS J1832-093, is detected up to ∼30 keV and is well-described b…
Galaxy kinematics in the XMMU J2235-2557 cluster field at z 1.4
Böhm, A.; Tanaka, M.; Ziegler, B. +2 more
Aims: The relationship between baryonic and dark components in galaxies varies with the environment and cosmic time. Galaxy scaling relations describe strong trends between important physical properties. A very important quantitative tool in case of spiral galaxies is the Tully-Fisher relation (TFR), which combines the luminosity of the stell…
Trapping mechanism of O2 in water ice as first measured by Rosetta spacecraft
Bar-Nun, Akiva; Laufer, Diana; Ninio Greenberg, Adi
One of the most surprising measurements of the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument on the comet 67P/Churyumov-Gerasimenko was the detection of O2 along with N2 and noble gases which were measured for the first time in comets, along with the major constituents, water, CO, and CO2<…