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Connection among environment, cloud-cloud collision speed, and star formation activity in the strongly barred galaxy NGC 1300
Ohta, Kouji; Maeda, Fumiya; Fujimoto, Yusuke +1 more
Cloud-cloud collision (CCC) has been suggested as a mechanism to induce massive star formation. Recent simulations suggest that a CCC speed is different among galactic-scale environments, which is responsible for observed differences in star formation activity. In particular, a high-speed CCC is proposed as a cause of star formation suppression in…
X-ray analysis of SDSS J165202.60+172852.4, an obscured quasar with outflows at peak galaxy formation epoch
Hamann, Fred; Veilleux, Sylvain; Goulding, Andy D. +4 more
We report on deep XMM-Newton and NuSTAR observations of the high redshift, z = 2.94, extremely red quasar (ERQ), SDSS J165202.60+172852.4, with known galactic ionized outflows detected via spatially resolved [O III] emission lines. X-ray observations allow us to directly probe the accretion disc luminosity and the geometry and scale of the circumn…
NGTS clusters survey - III. A low-mass eclipsing binary in the Blanco 1 open cluster spanning the fully convective boundary
Triaud, Amaury H. M. J.; Wheatley, Peter J.; Bayliss, Daniel +27 more
We present the discovery and characterization of an eclipsing binary identified by the Next Generation Transit Survey in the ~115-Myr-old Blanco 1 open cluster. NGTS J0002-29 comprises three M dwarfs: a short-period binary and a companion in a wider orbit. This system is the first well-characterized, low-mass eclipsing binary in Blanco 1. With a l…
Molecular Gas within the Milky Way's Nuclear Wind
Richter, Philipp; Jenkins, Edward B.; Savage, Blair D. +9 more
We report the first direct detection of molecular hydrogen associated with the Galactic nuclear wind. The Far-Ultraviolet Spectroscopic Explorer spectrum of LS 4825, a B1 Ib-II star at l, b = 1.67°,-6.63° lying d = 9.9 ${}_{-0.8}^{+1.4}$ kpc from the Sun, ~1 kpc below the Galactic plane near the Galactic center, shows two high-velocity H2
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 …