We report the results of narrow band imaging of the bipolar outflow source NGC 2818 in transitions of [NII], [OIII], [SII], and HI. As a consequence, we are...
The density matrix approach to polarized radiative transfer
The density matrix approach to polarized radiative transfer is reviewed, with particular emphasis on the physical assumptions that are at the basis of the...
We present a precise procedure for obtaining predictions of any clustering model for the density of Abell clusters. To this end we use results from the recently...
The Density, Extinction, and Excitation Characteristics of NGC 6445
We have acquired [O III] lambda5007, H I lambdalambda6563 and 4861, and [S II] lambdalambda6717 and 6731 imaging of the bipolar outflow source NGC 6445. As a...
The Density, Extinction, Temperature, and Excitation Structures of NGC 2440
We have observed the planetary nebula NGC 2440 in the transitions [O II] λ3727, He II λ4686, [O III] λλ(4363+5007), H I λλ(4861+6563), He I λ5876, [N II] λ6584...
The dependence of the gradients of oxygen and nitrogen-to-oxygen on stellar age in MaNGA galaxies
We derived the oxygen abundance (O/H), the nitrogen-to-oxygen (N/O) abundance ratio, and their corresponding radial gradients for a sample of 1431 galaxies from...
The dependence of the magnetism of a near-limb sunspot on height
Context. The physical parameters of the sunspot are not fully understood, especially the height dependence of the magnetic field. So far, it is also an open...
The DES view of the Eridanus supervoid and the CMB cold spot
The Cold Spot is a puzzling large-scale feature in the Cosmic Microwave Background temperature maps and its origin has been subject to active debate. As an...
The descent and bouncing path of the Hayabusa2 lander MASCOT at asteroid (162173) Ryugu
Images from the Optical Navigation Camera system (ONC) onboard the Hayabusa2 spacecraft show the MASCOT lander during its descent to the surface of asteroid...