We present the results from a multiwavelength campaign of GRS 1915+105 performed from 2000 April 16 to 25. This is one of the largest coordinated set of observations ever performed for this source, covering the wide energy band in radio (13.3–0.3 cm), near-infrared (J-H-K), X-rays and Gamma-rays (from 1 keV to 10 MeV). During the campaign GRS 1915+105 was predominantly in the “plateau” (or low/...

The life test of the 30 cm diameter ion thruster developed by Lanzhou institute physics began in Apr. 2018 and ended Jan. 2020, lasting 6,500 h. This paper introduces results 6,500-h completed on ground, including ground facility for test, variations thrusters working performance, times breakdown power restart, erosion key components. show that performance parameters, such as thrust, specific i...

Abstract Deuterium fractionation provides a window into the thermal history of volatiles in solar system and protoplanetary disks. While evidence active molecular deuteration has been observed toward handful disks, it remains unclear whether this chemistry affects composition forming planetesimals due to limited observational constraints on radial vertical distribution deuterated molecules. To ...

Based on the microlensing variability of the two-image gravitational lens HE 1104–1805 observed between 0.4 and 8 μm, we have measured the size and wavelength-dependent structure of the quasar accretion disk. Modeled as a power law in temperature, T ∝ R, we measure a B-band (0.13 μm in the rest frame) half-light radius of R1/2,B = 6.7 +6.2 −3.2 × 10 15 cm (68% CL) and a logarithmic slope of β =...

In a turbulent proto-planetary disk, dust grains undergo large density fluctuations and under the right circumstances, these grain overdensities can overcome shear, turbulent, and gas pressure support to collapse under self-gravity (forming a “pebble pile” planetesimal). Using a simple analytic model for the fluctuations predicted in simulations, we estimate the rate-of-formation and mass funct...

Massive molecular gas has been discovered in giant elliptical galaxies at the centers of galaxy clusters. To reveal its role active galactic nucleus (AGN) feedback those galaxies, we construct a semianalytical model circulation. This especially focuses on massive (interstellar cold scale ~ 10 kpc) and circumnuclear disk (~< 0.5 kpc). We consider destruction interstellar by star formation gravit...

The Wisconsin H-Alpha Mapper (WHAM) Northern Sky Survey is revealing that many intermediate-velocity (|v LSR | ≤ 100 km s −1) neutral clouds and complexes have an associated ionized component. We present the first map of the Hα emission from an intermediate-or high-velocity structure: Complex K. This large, high-latitude feature stretches from ℓ ≈ 10 • to 70 • , b ≈ +30 • to +70 • and peaks in ...