Search Publications
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IV. Rapidly Growing (Super)Massive Black Holes in Extremely Radio-loud Galaxies
Lee, Chien-Hsiu; Schramm, Malte; Ueda, Yoshihiro +19 more
We present the optical and infrared properties of 39 extremely radio-loud galaxies discovered by cross-matching the Subaru/Hyper Suprime-Cam (HSC) deep optical imaging survey and VLA/FIRST 1.4 GHz radio survey. The recent Subaru/HSC strategic survey revealed optically faint radio galaxies (RG) down to gAB ~ 26, opening a new parameter s…
Time domain astronomy with the THESEUS satellite
Mukai, K.; Campana, S.; Della Valle, M. +74 more
THESEUS is a medium size space mission of the European Space Agency, currently under evaluation for a possible launch in 2032. Its main objectives are to investigate the early Universe through the observation of gamma-ray bursts and to study the gravitational waves electromagnetic counterparts and neutrino events. On the other hand, its instrument…
Irradiance Variations of the Sun and Sun-Like Stars - Overview of Topical Collection
Kopp, Greg; Shapiro, Alexander
This topical collection summarizes recent advances in observing and modeling irradiance variations of the Sun and Sun-like stars, emphasizing the links between surface magnetic fields and the resulting solar and stellar variability. In particular, the articles composing this collection summarize recent progress in i) solar-irradiance measurements;…
A review of the SCOSTEP's 5-year scientific program VarSITI—Variability of the Sun and Its Terrestrial Impact
Shiokawa, Kazuo; Georgieva, Katya
The Sun is a variable active-dynamo star, emitting radiation in all wavelengths and solar-wind plasma to the interplanetary space. The Earth is immersed in this radiation and solar wind, showing various responses in geospace and atmosphere. This Sun–Earth connection variates in time scales from milli-seconds to millennia and beyond. The solar acti…
Time-dependent properties of sunspot groups. I. Lifetime and asymmetric evolution
Forgács-Dajka, Emese; Dobos, László; Ballai, István
Aims: In this paper, we aim to study the time dependence of sunspot group areas in a large sample composed of various databases spanning over 130 years, used state-of-the-art statistical methods.
Methods: For a carefully selected but unbiased sample, we use Bayesian modelling to fit the temporal evolution of the combined umbral and penum…
Cloud Properties of Brown Dwarf Binaries across the L/T Transition
Barman, Travis; Stone, Jordan M.; Konopacky, Quinn M. +1 more
We present a new suite of atmosphere models with flexible cloud parameters to investigate the effects of clouds on brown dwarfs across the L/T transition. We fit these models to a sample of 13 objects with well-known masses, distances, and spectral types spanning L3-T5. Our modeling is guided by spatially resolved photometry from the Hubble Space …
The metal-poor end of the Spite plateau. II. Chemical and dynamical investigation
Steffen, M.; Bonifacio, P.; Caffau, E. +7 more
Context. The study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their emission of ionising photons.
Aims: We present a detailed chemical analysis and determination of the kinematic and orbit…
Young giants of intermediate mass. Evidence of rotation and mixing
Mucciarelli, Alessio; Meynet, Georges; Bonifacio, Piercarlo +7 more
Context. In the search of a sample of metal-poor bright giants using Strömgren photometry, we serendipitously found a sample of 26 young (ages younger than 1 Gyr) metal-rich giants, some of which have high rotational velocities.
Aims: We determined the chemical composition and rotational velocities of these stars in order to compare them with…
ALMA resolves giant molecular clouds in a tidal dwarf galaxy
Moore, T. J. T.; Meidt, S. E.; Schinnerer, E. +12 more
Tidal dwarf galaxies (TDGs) are gravitationally bound condensations of gas and stars that formed during galaxy interactions. Here we present multi-configuration ALMA observations of J1023+1952, a TDG in the interacting system Arp 94, where we resolved CO(2-1) emission down to giant molecular clouds (GMCs) at 0.64″∼45 pc resolution. We find a remar…
The Diverse Morphologies and Structures of Dwarf Galaxies Hosting Optically Selected Active Massive Black Holes
Greene, Jenny E.; Geha, Marla; Schutte, Zachary +2 more
We present a study of 41 dwarf galaxies hosting active massive black holes (BHs) using Hubble Space Telescope observations. The host galaxies have stellar masses in the range of M⋆ ∼ 108.5-109.5 M⊙ and were selected to host active galactic nuclei (AGNs) based on narrow emission line ratios derived from S…