Josephine Fenske et al 2021 AJ 161 156
A runaway B-type star is identified that may have originated in the high-mass star-forming region NGC 7538, forming one of the ~500 solar-mass elliptical ring structures seen there via its stellar wind.
Debora Pelliccia et al 2021 ApJL 908 L30
A new, spectroscopically confirmed strong-Lyα-emitting primeval galaxy at z = 7.03 shows two distinct components that may represent two stellar populations, possibly due to rejuvenation or merging events.
Fei Wang and Jinping He 2021 ApJ 909 9
The red edge, a spectral fingerprint of light-harvesting vegetation, shows significant diurnal variation on Earth, suggesting it won’t be efficiently detectable on exoplanets without proper observing geometry conditions and time.
Alexander W. Raymond et al 2021 ApJS 253 5
Historical meteorology and radiative transfer analysis is used to evaluate site performance for 40 candidate sites for an expanded Event Horizon Telescope array with improved imaging capabilities.
Elena González et al 2021 ApJL 908 L29
New simulations show that typical young star clusters with low metallicities and high binary fractions in massive stars can form black holes in the upper-mass gap and often form at least one intermediate-mass black hole.
Courtney Carter et al 2021 ApJ 908 208
More than 70% of a sample of 482 very metal poor stars near the galactic disk are on prograde orbits and this fraction increases toward lower metallicities, suggesting a heterogeneous origin for this population.