Search Publications
Properties of giant molecular clouds in the strongly barred galaxy NGC 1300
Ohta, Kouji; Maeda, Fumiya; Fujimoto, Yusuke +1 more
Star formation activity depends on galactic-scale environments. To understand the variations in star formation activity, comparing the properties of giant molecular clouds (GMCs) among environments with different star formation efficiency (SFE) is necessary. We thus focus on a strongly barred galaxy to investigate the impact of the galactic enviro…
The nature of CR7 revealed with MUSE: a young starburst powering extended Ly α emission at z = 6.6
Richard, Johan; Nanayakkara, Themiya; Sobral, David +11 more
CR7 is among the most luminous Ly α emitters (LAEs) known at z = 6.6 and consists of at least three UV components that are surrounded by Ly α emission. Previous studies have suggested that it may host an extreme ionizing source. Here, we present deep integral field spectroscopy of CR7 with VLT/Multi Unit Spectroscopic Explorer (MUSE). We measure e…
A Habitable-zone Earth-sized Planet Rescued from False Positive Status
Vanderburg, Andrew; Bryson, Steve; Latham, David W. +9 more
We report the discovery of an Earth-sized planet in the habitable zone of a low-mass star called Kepler-1649. The planet, Kepler-1649 c, is 1.06 ${}_{-0.10}^{+0.15}$ times the size of Earth and transits its 0.1977 ± 0.0051 ${M}_{\odot }$ "mid" M-dwarf host star every 19.5 days. It receives 74% ± 3% the incident flux of Earth, giving it an equilibr…
First detection of the carbon chain molecules 13CCC and C13CC towards SgrB2(M)
Giesen, T. F.; Stutzki, J.; Simon, R. +4 more
Context. Carbon molecules and their 13C-isotopologues can be used to determine the 12C/13C abundance ratios in stellar and interstellar objects. C3 is a pure carbon chain molecule found in star-forming regions and in stellar shells of carbon-rich late-type stars. Latest laboratory data of 13C-…
Magnetic Properties of Asteroid (162173) Ryugu
Motschmann, Uwe; Fujimoto, Masaki; Richter, Ingo +22 more
Observations of the magnetization state of asteroids indicate diverse properties. Values between 1.9 × 10-6 Am2/kg (Eros) and 10-2 Am2/kg (Braille) have been reported. A more detailed understanding of asteroidal magnetic properties allows far-reaching conclusions of the magnetization mechanism as well as…
NGTS clusters survey - II. White-light flares from the youngest stars in Orion
Jackman, James A. G.; Wheatley, Peter J.; Moyano, Maximiliano +18 more
We present the detection of high-energy white-light flares from pre-main-sequence stars associated with the Orion Complex, observed as part of the Next Generation Transit Survey (NGTS). With energies up to 5.2 × 1035 erg these flares are some of the most energetic white-light flare events seen to date. We have used the NGTS observations…
Orbital variability of the optical linear polarization of the γ-ray binary LS I +61° 303 and new constraints on the orbital parameters
Piirola, Vilppu; Tsygankov, Sergey S.; Poutanen, Juri +8 more
We studied the variability of the linear polarization and brightness of the γ-ray binary LS I +61° 303. High-precision BVR photopolarimetric observations were carried out with the Dipol-2 polarimeter on the 2.2 m remotely controlled UH88 telescope at Mauna Kea Observatory and the 60 cm Tohoku telescope at Haleakala bservatory (Hawaii) over 140 nig…
Estimating the Temperature and Density of a Spicule from 100 GHz Data Obtained with ALMA
Shibata, Kazunari; Shimojo, Masumi; Narukage, Noriyuki +6 more
We succeeded in observing two large spicules simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA), the Interface Region Imaging Spectrograph (IRIS), and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory. One is a spicule seen in the IRIS Mg II slit-jaw images and AIA 304 Å images (Mg II/304 Å spi…
Follow-up Studies of Five Cataclysmic Variable Candidates Discovered by LAMOST
Thorstensen, John R.
We report follow-up observations of five cataclysmic variable candidates from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) published by Hou et al. LAMOST J024048.51+195226.9 is the most unusual of the five; an early-M type secondary star contributes strongly to its spectrum, and its spectral and photometric behavior are s…
Plasma Diagnostics from Active Region and Quiet-Sun Spectra Observed by Hinode/EIS: Quantifying the Departures from a Maxwellian Distribution
Dudík, Jaroslav; Dzifčáková, Elena; Mason, Helen E. +2 more
We perform plasma diagnostics, including that of the non-Maxwellian κ-distributions, in several structures observed in the solar corona by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on board the Hinode spacecraft. To prevent uncertainties due to the in-flight calibration of EIS, we selected spectral atlases observed shortly after the launc…