Search Publications
Multi-satellite observations of energy transport during an intense geomagnetic storm
Dunlop, M. W.; Duan, Aiying; Ma, Yuduan +1 more
Energy transport during a geomagnetic substorm is a very important process for solar wind-magnetosphere energy coupling and the energy cycle in the magnetotail. In this paper, we use magnetotail data from the five THEMIS probes and two Cluster satellites on the dayside to investigate the energy transport of one intense storm during the period from…
Coronal Dynamic Activities in the Declining Phase of a Solar Cycle
Choe, G. S.; Woods, T. N.; Jang, Minhwan +1 more
It has been known that some solar activity indicators show a double-peak feature in their evolution through a solar cycle, which is not conspicuous in sunspot number. In this Letter, we investigate the high solar dynamic activity in the declining phase of the sunspot cycle by examining the evolution of polar and low-latitude coronal hole (CH) area…
A Robust Measure of Dark Matter Halo Ellipticities
Evslin, Jarah
In simulations of the standard cosmological model (ΛCDM), dark matter halos are aspherical. However, so far the asphericity of an individual galaxy’s halo has never been robustly established. We use the Jeans equations to define a quantity that robustly characterizes a deviation from rotational symmetry. This quantity is essentially the gravitatio…
K band SINFONI spectra of two z ~ 5 submillimeter galaxy systems: upper limits to the unobscured star formation from [O II] optical emission line searches
Arribas, Santiago; Colina, Luis; Storchi-Bergmann, Thaisa +2 more
We present deep SINFONI K-band integral field spectra of two submillimeter galaxy systems (SMG): BR 1202-0725 and J1000+0234, at z = 4.69 and 4.55, respectively. Spectra extracted for each object in the two systems do not show any signature of the [O II]λλ3726, 29 Å emission-lines, placing upper flux limits of 3.9 and 2.5 × 10-18erg s
Observations of the planetary nebula RWT 152 with OSIRIS/GTC
Solano, E.; Ulla, A.; Miranda, L. F. +2 more
RWT 152 is one of the few known planetary nebulae with an sdO central star. We present subarcsecond red tunable filter Hα imaging and intermediate-resolution, long-slit spectroscopy of RWT 152 obtained with OSIRIS/GTC (Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy/Gran Telescopio Canarias) with the goal of anal…
From Exoplanets to Quasars: Detection of Potential Damped Lyα Absorbing Galaxies Using Angular Differential Imaging
Ellison, Sara L.; Johnson-Groh, Mara; Marois, Christian
The advantages of angular differential imaging (ADI) have been previously untested in imaging the host galaxies of damped Lyα (DLA) systems. In this pilot study, we present the first application of ADI to directly image the host galaxy of the DLA seen toward the quasar J1431+3952. K-band imaging of the field surrounding J1431+3952 was obtained on …
In Situ Detection of Organics in the Comet 67P/Churyumov-Gerasimenko
Kaiser, Ralf I.; Bergantini, Alexandre
Comets are fascinating objects transporting complex organic molecules from the outer to the inner solar system. A paper published in Nature by Fray and co-workers presents key results of the Rosetta mission by collecting in situ data of refractory grains from comet 67P/Churyumov-Gerasimenko in 2014.
LYRA Mid-Term Periodicities
Dammasch, I. E.; Dominique, M.; Wauters, L.
The spectra of the PROBA2/LYRA data, similarly to every other solar time series, show predominant periodicities that can be of solar or instrumental origin. In this article, we compare the main periodicities characterizing the LYRA spectrum to those found in the sunspot number, in the 10.7 cm flux, in an X-ray flare index, and in the sunspot area …
XMM-Newton and Chandra Observations of the Filled-center Supernova Remnant G63.7+1.1
Safi-Harb, S.; Kothes, R.; Matheson, H.
Pulsar wind nebulae (PWNe) provide unique opportunities to study relativistic pulsar winds and their interaction with the surrounding medium. G63.7+1.1 is an intriguing supernova remnant studied so far only at radio wavelengths and classified as a PWN candidate based on its nonthermal radio emission. We present the first X-ray study of G63.7+1.1, …
Analysis of luminosity distributions and the shape parameters of strong gravitational lensing elliptical galaxies
Magain, P.; Sluse, D.; Chantry, V. +1 more
Context. The luminosity profiles of galaxies acting as strong gravitational lenses can be tricky to study. Indeed, strong gravitational lensing images display several lensed components, both point-like and diffuse, around the lensing galaxy. Those objects limit the study of the galaxy luminosity to its inner parts. Therefore, the usual fitting met…