Search Publications
Gamma-ray signals from multicomponent scalar dark matter decays
Ibarra, Alejandro; Ghosh, Avirup; Mondal, Tanmoy +1 more
Within a multicomponent dark matter scenario, novel gamma-ray signals may arise from the decay of the heavier dark matter component into the lighter. For a scalar dark sector of this kind, the decay phi2→phi1 γ is forbidden by the conservation of angular momentum, but the decay phi2 → phi1 γγ can have a …
Multi-spacecraft Current Estimates at Swarm
Cao, J. -B.; Yang, J. -Y.; Yang, Y. -Y. +2 more
In this chapter the application of the curlometer technique to various regions of the inner magnetosphere and upper ionosphere and for special circumstances of sampling is described. The basic technique is first outlined, together with the caveats of use, covering: the four-spacecraft technique, its quality factor and limitations; the lessons lear…
A Single-chord Stellar Occultation by the Extreme Trans-Neptunian Object (541132) Leleākūhonua
Sicardy, Bruno; Buie, Marc W.; Leiva, Rodrigo +32 more
A stellar occultation by the extreme large-perihelion trans-Neptunian object (541132) Leleākūhonua (also known by the provisional designation of 2015 TG387) was predicted by the Lucky Star project and observed with the Research and Education Collaborative Occultation Network on 2018 October 20 UT. A single detection and a nearby nondete…
Exo-MerCat: A merged exoplanet catalog with Virtual Observatory connection
Claudi, R.; Bignamini, A.; Molinaro, M. +1 more
The heterogeneity of papers dealing with the discovery and characterization of exoplanets makes every attempt to maintain a uniform exoplanet catalog almost impossible. Four sources currently available online (NASA Exoplanet Archive, Exoplanet Orbit Database, Exoplanet Encyclopaedia, and Open Exoplanet Catalogue) are commonly used by the community…
Existence of the Metal-rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Shi, Jianrong; Ma, Jun; Du, Cuihua +3 more
Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity stars that have a relative speed of at least 220 $\mathrm{km}\ {{\rm{s}}}^{-1}$ with respect to the local standard of rest in the Galaxy. The rotational velocity distribut…
Spectral Structures of Type II Solar Radio Bursts and Solar Energetic Particles
Yashiro, Seiji; Nitta, Nariaki V.; Iwai, Kazumasa +1 more
We investigated the relationship between the spectral structures of type II solar radio bursts in the hectometric and kilometric wavelength ranges and solar energetic particles (SEPs). To examine the statistical relationship between type II bursts and SEPs, we selected 26 coronal mass ejection (CME) events with similar characteristics (e.g., initi…
Testing the Fidelity of Simulations of Black Hole-Galaxy Coevolution at z ∼ 1.5 with Observations
Treu, Tommaso; Bhowmick, Aklant K.; Menci, N. +3 more
We examine the scaling relations between the mass of a supermassive black hole (SMBH) and its host galaxy properties at 1.2 < z <1.7 using both observational data and simulations. Recent measurements of 32 X-ray-selected, broad-line active galactic nuclei (AGNs) are compared with two independent state-of-the-art efforts, including the hydrod…
The XXL Survey. XL. Obscuration properties of red AGNs in XXL-N
Chiappetti, L.; Paltani, S.; Pierre, M. +6 more
The combination of optical and mid-infrared (MIR) photometry has been extensively used to select red active galactic nuclei (AGNs). Our aim is to explore the obscuration properties of these red AGNs with both X-ray spectroscopy and spectral energy distributions (SEDs). In this study, we re-visit the relation between optical/MIR extinction and X-ra…
MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384
Kale, R.; Oozeer, N.; Parekh, V. +12 more
We present the discovery of a single radio relic located at the edge of the galaxy cluster A2384, using the MeerKAT radio telescope. A2384 is a nearby (z = 0.092), low-mass, complex bimodal, merging galaxy cluster that displays a dense X-ray filament (∼700 kpc in length) between A2384(N; northern cluster) and A2384(S; southern cluster). The origin…
XO-7 b: A Transiting Hot Jupiter with a Massive Companion on a Wide Orbit
Crouzet, Nicolas; Nielsen, Louise D.; Osborn, Hugh P. +16 more
Transiting planets orbiting bright stars are the most favorable targets for follow-up and characterization. We report the discovery of the transiting hot Jupiter XO-7 b and of a second, massive companion on a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf (V = 10.52, {T}eff}=6250+/- 100 {{K}}, [{Fe}/{{H}}]=0.432+/- 0.0…