Doppler-velocity Drifts Detected in a Solar Prominence
We analyzed multiline observations of a quiescent prominence from the slit spectrograph located at the Ondřejov Observatory. Dopplergrams and integrated...
Dramatic Drop in the X-Ray Polarization of Swift J1727.8–1613 in the Soft Spectral State
Black hole X-ray binaries exhibit different spectral and timing properties in different accretion states. The X-ray outburst of a recently discovered and...
Dual-frequency mapping with the Tenerife cosmic microwave background experiments
We present maps of the sky at intermediate angular resolution (5 deg) of the declination range 35.0-45.0 deg obtained with the Tenerife cosmic microwave...
Dust and Gas Obscuration in ELAIS Deep X-Ray Survey Reddened Quasars
Hard X-ray surveys have uncovered a large population of heavily obscured AGNs. They also reveal a population of quasars with moderate obscuration at both...
Dust around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observations
Spitzer/infrared spectrograph (IRS) spectra from 5 to 37 μm for a complete sample of 31 R Coronae Borealis stars (RCBs) are presented. These spectra are...
Dust Around R Coronae Borealis Stars. II. Infrared Emission Features in an H-poor Environment
Residual Spitzer/Infrared Spectrograph spectra for a sample of 31 R Coronae Borealis (RCB) stars are presented and discussed in terms of narrow emission...
Dust Environment Model of the Interstellar Comet 2I/Borisov
2I/Borisov is the first interstellar comet discovered on 2019 August 30, and it soon showed a coma and a dust tail. This study reports the results of images...
Dust in Clusters: Separating the Contribution of Galaxies and Intracluster Media
We have analyzed a sample of 327 clusters of galaxies, spanning the range of 0.06–0.70 in redshift. Strong constraints on their mean intracluster emission of...
Dust in the Polar Region as a Major Contributor to the Infrared Emission of Active Galactic Nuclei
Dust around active galactic nuclei (AGNs) is distributed over a wide range of spatial scales and can be observed in the infrared (IR). It is generally assumed...