Search Publications
Search for Hydrogenated C60 (Fulleranes) in Circumstellar Envelopes
Zhang, Yong; Kwok, Sun; Sadjadi, SeyedAbdolreza +1 more
The recent detection of fullerene (C60) in space and the positive assignment of five diffuse interstellar bands to {{{C}}}60+ reinforce the notion that fullerene-related compounds can be efficiently formed in circumstellar envelopes and be present in significant quantities in the interstellar medium. Experimental s…
The Relation Between Magnetic Fields and X-ray Emission for Solar Microflares and Active Regions
Kirichenko, A. S.; Bogachev, S. A.
We present the result of a comparison between magnetic field parameters and the intensity of X-ray emission for solar microflares with Geosynchronous Operational Environmental Satellites (GOES) classes from A0.02 to B5.1. For our study, we used the monochromatic MgXII Imaging Spectroheliometer (MISH), the Full-disk EUV Telescope (FET), and the Sol…
Proper Motions of Jets on the Kiloparsec Scale: New Results with HST
Anderson, Jay; Sparks, William B.; Georganopoulos, Markos +7 more
The Hubble Space Telescope recently celebrated 25 years of operation. Some of the first images of extragalactic optical jets were taken by HST in the mid-1990s; with time baselines on the order of 20 years and state-of-the-art astrometry techniques, we are now able to reach accuracies in proper-motion measurements on the order of a tenth of a mill…
The Radial Distributions of the Two Main-sequence Components in the Young Massive Star Cluster NGC 1856
Milone, Antonino P.; Deng, Licai; de Grijs, Richard +1 more
The recent discovery of double main sequences in the young, massive star cluster NGC 1856 has caught significant attention. The observations can be explained by invoking two stellar generations with different ages and metallicities or by a single generation of stars composed of two populations characterized by different rotation rates. We analyzed…
Background derivation and image flattening: getimages
Men'shchikov, A.
Modern high-resolution images obtained with space observatories display extremely strong intensity variations across images on all spatial scales. Source extraction in such images with methods based on global thresholding may bring unacceptably large numbers of spurious sources in bright areas while failing to detect sources in low-background or l…
Nitric oxide nightglow and Martian mesospheric circulation from MAVEN/IUVS observations and LMD-MGCM predictions
Forget, F.; Montmessin, F.; González-Galindo, F. +19 more
We report results from a study of nitric oxide nightglow over the northern hemisphere of Mars during winter, the southern hemisphere during fall equinox, and equatorial latitudes during summer in the northern hemisphere based on observations of the δ and γ bands between 190 and 270 nm by the Imaging UltraViolet Spectrograph (IUVS) on the Mars Atmo…
Detection of meteoroid hypervelocity impacts on the Cluster spacecraft: First results
Mann, Ingrid; Vaverka, Jakub; Pellinen-Wannberg, Asta +5 more
We present the first study of dust impact events on one of the Earth-orbiting Cluster satellites. The events were identified in the measurements of the wide band data (WBD) instrument on board the satellite operating in monopole configuration. Since 2009 the instrument is operating in this configuration due to the loss of three electric probes and…
Nature of shocks revealed by SOFIA OI observations in the Cepheus E protostellar outflow
Godard, B.; Codella, C.; Benedettini, M. +12 more
Context. Protostellar jets and outflows are key features of the star-formation process, and primary processes of the feedback of young stars on the interstellar medium. Understanding the underlying shocks is necessary to explain how jet and outflow systems are launched, and to quantify their chemical and energetic impacts on the surrounding medium…
Magnetic topological analysis of coronal bright points
Madjarska, M. S.; Huang, Z.; Wiegelmann, T. +2 more
Context. We report on the first of a series of studies on coronal bright points which investigate the physical mechanism that generates these phenomena.
Aims: The aim of this paper is to understand the magnetic-field structure that hosts the bright points.
Methods: We use longitudinal magnetograms taken by the Solar Optical Telescope wit…
The dependence of halo mass on galaxy size at fixed stellar mass using weak lensing
Hudson, Michael J.; Balogh, Michael L.; Charlton, Paul J. L. +1 more
Stellar mass has been shown to correlate with halo mass, with non-negligible scatter. The stellar mass-size and luminosity-size relationships of galaxies also show significant scatter in galaxy size at fixed stellar mass. It is possible that, at fixed stellar mass and galaxy colour, the halo mass is correlated with galaxy size. Galaxy-galaxy lensi…