Search Publications
Nuclear ashes and outflow in the eruptive star Nova Vul 1670
Menten, Karl M.; Kraus, Alexander; Hajduk, Marcin +3 more
CK Vulpeculae was observed in outburst in 1670-1672 (ref. 1), but no counterpart was seen until 1982, when a bipolar nebula was found at its location. Historically, CK Vul has been considered to be a nova (Nova Vul 1670), but its similarity to `red transients', which are more luminous than classical novae and thought to be the results of stellar c…
Frontier Fields Clusters: Chandra and JVLA View of the Pre-merging Cluster MACS J0416.1-2403
Churazov, E.; Zitrin, A.; Rosati, P. +26 more
Merging galaxy clusters leave long-lasting signatures on the baryonic and non-baryonic cluster constituents, including shock fronts, cold fronts, X-ray substructure, radio halos, and offsets between the dark matter (DM) and the gas components. Using observations from Chandra, the Jansky Very Large Array, the Giant Metrewave Radio Telescope, and th…
Reconstruction of Helio-Latitudinal Structure of the Solar Wind Proton Speed and Density
Tokumaru, Munetoshi; Bzowski, Maciej; Swaczyna, Paweł +1 more
The modeling of the heliosphere requires continuous three-dimensional solar wind data. The in-situ out-of-ecliptic measurements are very rare, so that other methods of solar wind detection are needed. We use the remote-sensing data of the solar wind speed from observations of interplanetary scintillation (IPS) to reconstruct spatial and temporal s…
On the nature of Hα emitters at z ∼ 2 from the HiZELS survey: physical properties, Lyα escape fraction and main sequence
Smail, I.; Cepa, J.; Ivison, R. J. +4 more
We present a detailed multiwavelength study (from rest-frame ultraviolet to far-infrared) of narrow-band selected, star-forming (SF) Hα emitters (HAEs) at z ∼ 2.23 taken from the High-Redshift(Z) Emission Line Survey (HiZELS). We find that HAEs have similar properties and colours derived from spectral energy distributions as sBzK galaxies, and pro…
Multiwavelength constraints on the inflationary consistency relation
Hložek, Renée; Hadzhiyska, Boryana; Meerburg, P. Daniel +1 more
We present the first attempt to use a combination of CMB, LIGO, and Pulsar Timing Array (PPTA) data to constrain both the tilt and the running of primordial tensor power spectrum through constraints on the gravitational wave energy density generated in the early universe. Combining measurements at different cosmological scales highlights how compl…
A Steady-state Picture of Solar Wind Acceleration and Charge State Composition Derived from a Global Wave-driven MHD Model
Gombosi, T. I.; Lepri, S. T.; Landi, E. +7 more
The higher charge states found in slow (<400 km s-1) solar wind streams compared to fast streams have supported the hypothesis that the slow wind originates in closed coronal loops and is released intermittently through reconnection. Here we examine whether a highly ionized slow wind can also form along steady and open magnetic field…
On Estimating the High-energy Cutoff in the X-Ray Spectra of Black Holes via Reflection Spectroscopy
Steiner, James F.; McClintock, Jeffrey E.; Wilms, Jörn +3 more
The fundamental parameters describing the coronal spectrum of an accreting black hole are the slope Γ of the power-law continuum and the energy Ecut at which it rolls over. Remarkably, this latter parameter can be accurately measured for values as high as 1 MeV by modeling the spectrum of X-rays reflected from a black hole accretion dis…
A Hard X-Ray Study of the Ultraluminous X-Ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton
Harrison, F. A.; Stern, D.; Fabian, A. C. +16 more
We present the results from coordinated X-ray observations of the ultraluminous X-ray source NGC 5204 X-1 performed by the Nuclear Spectroscopic Telescope Array and XMM-Newton in early 2013. These observations provide the first detection of NGC 5204 X-1 above 10 {keV}, extending the broadband coverage to 0.3-20 {keV}. The observations were carried…
A Circular-ribbon Solar Flare Following an Asymmetric Filament Eruption
Liu, Yang; Liu, Chang; Wang, Haimin +6 more
The dynamic properties of flare ribbons and the often associated filament eruptions can provide crucial information on the flaring coronal magnetic field. This Letter analyzes the GOES-class X1.0 flare on 2014 March 29 (SOL2014-03-29T17:48), in which we found an asymmetric eruption of a sigmoidal filament and an ensuing circular flare ribbon. Init…
Evolution and Consequences of Interacting CMEs of 9 - 10 November 2012 Using STEREO/SECCHI and In Situ Observations
Srivastava, Nandita; Mishra, Wageesh; Chakrabarty, D.
Understanding the kinematic evolution of coronal mass ejections (CMEs) in the heliosphere is important to estimate their arrival time at Earth. The kinematics of CMEs can change when they interact or collide with each other as they propagate in the heliosphere. In this article, we analyze the collision and post-interaction characteristics of two E…