Search Publications
High-resolution ALMA Study of CO J = 2-1 Line and Dust Continuum Emissions in Cluster Galaxies at z = 1.46
Tamura, Yoichi; Kohno, Kotaro; Suzuki, Tomoko L. +11 more
We present new Atacama Large Millimeter/submillimeter Array (ALMA) results obtained from spatially resolved CO J = 2-1 line (0.″4 resolution) and 870 µm continuum (0.″2 resolution) observations of cluster galaxies in XMMXCS J2215.9-1738 at z = 1.46. Our sample comprises 17 galaxies within ~0.5 Mpc (0.6R 200) of the cluster center,…
Kepler-1656b's Extreme Eccentricity: Signature of a Gentle Giant
Howard, Andrew W.; Angelo, Isabel; Naoz, Smadar +4 more
Highly eccentric orbits are one of the major surprises of exoplanets relative to the solar system and indicate rich and tumultuous dynamical histories. One system of particular interest is Kepler-1656, which hosts a sub-Jovian planet with an eccentricity of 0.8. Sufficiently eccentric orbits will shrink in the semimajor axis due to tidal dissipati…
Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44
Koester, D.; Zuckerman, B.; Jura, M. +3 more
Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal 10 elements heavier than helium: C, N, O, Mg, Al, Si, P, S, Ca, and Fe. G238-44 is only the third white dwarf with nitrogen detected in its atmosphere from polluting planetary system material. K…
The post-common-envelope binary central star of the planetary nebula Ou 5: a doubly eclipsing post-red-giant-branch system
Corradi, Romano L. M.; Parsons, Steven G.; Munday, James +10 more
We present a detailed study of the stellar and orbital parameters of the post-common envelope binary central star of the planetary nebula Ou 5. Low-resolution spectra obtained during the primary eclipse - to our knowledge the first isolated spectra of the companion to a post-common-envelope planetary nebula central star - were compared to catalogu…
A Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE). XII. Ionised gas emission in the inner regions of lenticular galaxies
Andreani, P.; Ferrarese, L.; Buat, V. +24 more
As part of the Virgo Cluster Survey Tracing Ionised Gas Emission, a blind narrow-band Hα+[NII] imaging survey of the Virgo cluster carried out with MegaCam at the CFHT, we discovered eight massive (1010 ≲ Mstar ≲ 1011 M⊙) lenticular galaxies with prominent ionised gas emission features in their inner (a …
Moderate-resolution K-band Spectroscopy of the Substellar Companion VHS 1256 b
Macintosh, Bruce; Perrin, Marshall D.; Barman, Travis S. +6 more
We present moderate-resolution (R ~ 4000) K-band spectra of the planetary-mass companion VHS 1256 b. The data were taken with the OSIRIS integral field spectrograph at the W.M. Keck Observatory. The spectra reveal resolved molecular lines from H2O and CO. The spectra are compared to custom PHOENIX atmosphere model grids appropriate for …
MINCE. I. Presentation of the project and of the first year sample
Hansen, C. J.; Bonifacio, P.; Caffau, E. +20 more
Context. In recent years, Galactic archaeology has become a particularly vibrant field of astronomy, with its main focus set on the oldest stars of our Galaxy. In most cases, these stars have been identified as the most metal-poor. However, the struggle to find these ancient fossils has produced an important bias in the observations - in particula…
Black Hole Mass Measurements of Early-type Galaxies NGC 1380 and NGC 6861 through ALMA and HST Observations and Gas-dynamical Modeling
Ho, Luis C.; Barth, Aaron J.; Buote, David A. +6 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 2 observations of CO(2-1) emission from the circumnuclear disks in two early-type galaxies, NGC 1380 and NGC 6861. The disk in each galaxy is highly inclined (i ~ 75°), and the projected velocities of the molecular gas near the galaxy centers are ~300 km s-1 in NGC 138…
Possible Systematic Rotation in the Mature Stellar Population of a z = 9.1 Galaxy
Inoue, Akio K.; Hashimoto, Takuya; Sugahara, Yuma +13 more
We present new observations with the Atacama Large Millimeter/submillimeter Array for a gravitationally lensed galaxy at z = 9.1, MACS1149-JD1. [O III] 88 µm emission is detected at 10σ with a spatial resolution of ~0.3 kpc in the source plane, enabling the most distant morphokinematic study of a galaxy. The [O III] emission is distributed s…
The First Insight-HXMT Gamma-Ray Burst Catalog: The First Four Years
Li, Gang; Ge, Ming-Yu; Ma, Xiang +40 more
The Hard X-ray Modulation Telescope (Insight-HXMT) is China's first X-ray astronomy satellite. It was launched on 2017 June 15. The anticoincidence CsI detectors of the High Energy X-ray telescope (HE) on board Insight-HXMT could serve as an all-sky gamma-ray monitor in about 0.2-3 MeV. In its first four years of operation, Insight-HXMT has detect…