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Dying of the Light: An X-Ray Fading Cold Quasar at z ∼ 0.405
Kirkpatrick, Allison; Trump, Jonathan R.; LaMassa, Stephanie +11 more
Cold quasars are a rare subpopulation observed to host unobscured, X-ray luminous active galactic nuclei (AGN) while also retaining a cold gas supply fueling high star formation rates. These objects are interpreted as AGN early in their evolution. We present new SOFIA HAWC+ far-infrared observations, far-ultraviolet to far-infrared (FUV-FIR) photo…
Broad-band spectral analysis of LMXB XTE J1710-281 with Suzaku
Jain, Chetana; Dutta, Anjan; Sharma, Rahul +1 more
This work presents the broad-band time-averaged spectral analysis of neutron star (NS) low-mass X-ray binary, XTE J1710-281 by using the Suzaku archival data. The source was in a hard or an intermediate spectral state during this observation. This is the first time that a detailed spectral analysis of the persistent emission spectra of XTE J1710-2…
Shapes of stellar activity cycles
Hackman, T.; Käpylä, M. J.; Olspert, N. +4 more
Context. Magnetic activity cycles are an important phenomenon both in the Sun and other stars. The shape of the solar cycle is commonly characterised by a fast rise and a slower decline, but not much attention has been paid to the shape of cycles in other stars.
Aims: Our aim is to study whether the asymmetric shape of the solar cycle is comm…
A Search for Polarized Thermal Emission from Directly Imaged Exoplanets and Brown Dwarf Companions to Nearby Stars
Jensen-Clem, Rebecca; De Rosa, Robert J.; Hinkley, Sasha +15 more
Aerosols in the atmospheres of cloudy gas giant exoplanets and brown dwarfs scatter and polarize these objects' thermal emission. If such an object has an oblate shape or nonuniform cloud distribution, the net degree of linear polarization can show an increase ranging from several tenths of a percent to a few percent. Modern high-contrast imaging …
Reconstructing paleolakes in Nepenthes Mensae, Mars, using the distribution of putative deltas, coastal-like features, and terrestrial analogs
García-Arnay, Ángel; Gutiérrez, Francisco
Nepenthes Mensae is an equatorial region situated north of the Martian dichotomy, northwest of Gale crater. It is characterized by a NW-SE-oriented belt of interconnected depressions, Late Noachian to Early Hesperian in age, with knobby terrains with residual relief. The highlands south of Nepenthes Mensae, Middle Noachian in age, correspond to th…
A kinematically unbiased, all-sky search for nearby, young, low-mass stars
Murphy, Simon J.; Kastner, Joel H.; Principe, David A. +6 more
The past two decades have seen dramatic progress in our knowledge of the population of young stars of age < 200 Myr that lie within 150 pc of the Sun. These nearby, young stars, most of which are found in loose, comoving groups, provide the opportunity to explore (among many other things) the dissolution of stellar clusters and their diffusion …
Forward modeling of galaxy kinematics in slitless spectroscopy
Copin, Y.; Outini, M.
Context. Slitless spectroscopy has long been considered a complicated and confused technique. Nonetheless, with the advent of Hubble Space Telescope (HST) instruments, characterized by a low sky background level and a high spatial resolution (most notably WFC3), slitless spectroscopy has become an adopted survey tool to study galaxy evolution from…
On the Reliability of Photometric and Spectroscopic Tracers of Halo Relaxation
Gozaliasl, Ghassem; Zhoolideh Haghighi, Mohammad H.; Raouf, Mojtaba +2 more
We characterize the relaxation state of galaxy systems by providing an assessment of the reliability of the photometric and spectroscopic probe via the semianalytic galaxy evolution model. We quantify the correlations between the dynamical age of simuglated galaxy groups and popular proxies of halo relaxation in observation, which are mainly eithe…
Applying the Dual-Spacecraft Approach to the Swarm Constellation for Deriving Radial Current Density
Lühr, Hermann; Ritter, Patricia; Kervalishvili, Guram +1 more
One of the Swarm prime mission goals is the estimation of ionospheric currents. Of particular interest in this context are field-aligned currents (FACs). In order to improve our ability of determining FACs, two of the Swarm spacecraft are orbiting side-by-side separated only by 1.4° in longitude. This close-formation flight enables the application…
Space Weather Monitor at the L5 Point: A Case Study of a CME Observed with STEREO B
Mierla, M.; Zhukov, A. N.; Rodriguez, L. +2 more
An important location for future space weather monitoring is the Lagrange point 5 (L5) of the Sun-Earth system. We test the performance of L5 for space weather monitoring using STEREO B observations of an Earth-directed coronal mass ejection (CME), seen as a partial halo by SOHO at L1. STEREO B (located close to L5) continuously tracked the CME. B…