Search Publications
A Sun-to-Earth Analysis of Magnetic Helicity of the 2013 March 17-18 Interplanetary Coronal Mass Ejection
Gopalswamy, Nat; Akiyama, Sachiko; Yashiro, Seiji +4 more
We compare the magnetic helicity in the 2013 March 17-18 interplanetary coronal mass ejection (ICME) flux rope at 1 au and in its solar counterpart. The progenitor coronal mass ejection (CME) erupted on 2013 March 15 from NOAA active region 11692 and is associated with an M1.1 flare. We derive the source region reconnection flux using the post-eru…
Periodic eclipses of the young star PDS 110 discovered with WASP and KELT photometry
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +28 more
We report the discovery of eclipses by circumstellar disc material associated with the young star PDS 110 in the Ori OB1a association using the SuperWASP and Kilodegree Extremely Little Telescope surveys. PDS 110 (HD 290380, IRAS 05209-0107) is a rare Fe/Ge-type star, an ∼10 Myr-old accreting intermediate-mass star showing strong infrared excess (…
Characterizing the evolving K -band luminosity function using the UltraVISTA, CANDELS and HUDF surveys
Mortlock, Alice; Dunlop, James S.; McLure, Ross J. +5 more
We present the results of a new study of the K-band galaxy luminosity function (KLF) at redshifts z ≤ 3.75, based on a nested combination of the UltraVISTA, Cosmic Assembly Near-infrared Deep Legacy Extragalactic Survey and HUDF surveys. The large dynamic range in luminosity spanned by this new data set (3-4 dex over the full redshift range) is su…
Feedback of atomic jets from embedded protostars in NGC 1333
Güdel, Manuel; Dionatos, Odysseas
Context. The feedback of star formation to the parent cloud is conventionally examined through the study of molecular outflows. Little is known, however, about the effect that atomic ejecta tracing fast shocks can have on small scales or on global cloud properties.
Aims: Our immediate objective is to study the morphology of protostellar eject…
Winds in the Middle Cloud Deck From the Near-IR Imaging by the Venus Monitoring Camera Onboard Venus Express
Fedorova, A. A.; Ignatiev, N. I.; Markiewicz, W. J. +4 more
For more than 8 years the Venus Monitoring Camera (VMC) onboard the Venus Express orbiter performed continuous imaging of the Venus cloud layer in UV, visible and near-IR filters. We applied the correlation approach to sequences of the near-IR images at 965 nm to track cloud features and determine the wind field in the middle and lower cloud (49-5…
Seismic imaging of the Sun's far hemisphere and its applications in space weather forecasting
Lindsey, Charles; Braun, Douglas
The interior of the Sun is filled acoustic waves with periods of about 5 min. These waves, called "p modes," are understood to be excited by convection in a thin layer beneath the Sun's surface. The p modes cause seismic ripples, which we call "the solar oscillations." Helioseismic observatories use Doppler observations to map these oscillations, …
Central Engine and Host Galaxy of RXJ 1301.9+2747: A Multiwavelength View of a Low-mass Black Hole Active Galactic Nuclei with Ultra-soft X-Ray Emission
Shu, X. W.; Wang, J. X.; Wang, T. G. +3 more
RXJ 1301.9+2747 is an optically identified very-low-mass AGN candidate with {M}{BH}∼ 1× {10}6 {M}⊙ , which shows extremely soft X-ray emission and unusual X-ray variability in the form of short-lived flares. We present an analysis of multiwavelength observations of RXJ 1301.9+2747 in order to study the properties o…
A combined view of sterile-neutrino constraints from CMB and neutrino oscillation measurements
Bridle, Sarah; Elvin-Poole, Jack; Evans, Justin +3 more
We perform a comparative analysis of constraints on sterile neutrinos from the Planck experiment and from current and future neutrino oscillation experiments (MINOS, IceCube, SBN). For the first time, we express joint constraints on Neff and meffsterile from the CMB in the Δm2, sin2 2 θ para…
The Significance of the Influence of the CME Deflection in Interplanetary Space on the CME Arrival at Earth
Wang, Yuming; Shen, Chenglong; Zhuang, Bin +5 more
As one of the most violent astrophysical phenomena, coronal mass ejections (CMEs) have strong potential space weather effects. However, not all Earth-directed CMEs encounter the Earth and produce geo-effects. One reason is the deflected propagation of CMEs in interplanetary space. Although there have been several case studies clearly showing such …
X-ray variability of Seyfert 1.8/1.9 galaxies
Guainazzi, M.; Panessa, F.; González-Martín, O. +3 more
Context. Seyfert 1.8/1.9 are sources showing weak broad Hα components in their optical spectra. According to unification schemes, they are seen with an edge-on inclination, similar to type 2 Seyfert galaxies, but with slightly lower inclination angles.
Aims: We aim to test whether Seyfert 1.8/1.9 have similar properties at UV and X…