Search Publications
On the Emission Region of Type II Radio Bursts in Interplanetary Shock Fronts
Aguilar-Rodriguez, E.; Corona-Romero, P.
We analyze Type II radio emissions observed by the Radio and Plasma Waves instrument onboard Wind to determine the emission region in shock fronts, using the blast wave reconstruction technique. Our results suggest that the processes of emission of a Type II radio burst occur not only in the upstream region of the shock, i.e. the region that prece…
ALMA band 8 observations of DLA 2233+131 at z = 3.150
Kajisawa, Masaru; Nagao, Tohru; Kashikawa, Nobunari +8 more
We present our ALMA Band 8 observations of a damped Ly $\alpha$ absorption (DLA) system at $z = 3.150$ observed in the spectrum of the quasar Q2233+131 at $z = 3.295$ . The optical counterpart of this DLA has been identified and it shows a double-peaked Ly $\alpha$ emission line. Since one possible origin of DLAs at high redshift is an outflowing …
Massive Stars in the SDSS-IV-APOGEE Survey: Wolf-Rayet Stars of the WN Type
Minniti, Dante; Hernández, Jesús; Roman-Lopes, Alexandre +3 more
In this paper, we describe the results obtained in our study of Galactic Wolf-Rayet stars of the WN type, using the APOGEE2 spectrographs. The APOGEE2 WN star near-infrared spectra presented here were selected through a careful examination of the APOGEE2 DR16 sample, being compound of at least one exemplar of each Wolf-Rayet star from WN4 to WN11 …
Holding the Cosmos in Your Hand: Developing 3D Modeling and Printing Pipelines for Communications and Research
Arcand, Kimberly K.; Price, Sara R.; Watzke, Megan
Three-dimensional (3D) visualization has opened up a universe of possible scientific data representations. 3D printing has the potential to make seemingly abstract and esoteric data sets accessible, particularly through the lens of translating data into forms that can be explored in the tactile modality for people who are blind or visually impaire…
Flare Expansion to a Magnetic Rope Accompanied by Rare Radio Bursts
Dudík, Jaroslav; Kašparová, Jana; Zemanová, Alena +1 more
We present multispectral analysis (radio, Hα, ultraviolet (UV)/extreme ultraviolet (EUV), and hard X-ray) of a confined flare from 2015 March 12. This flare started within the active region NOAA 12 297 and then it expanded into a large preexisting magnetic rope embedded with a cold filament. The expansion started with several brightenings located …
Magnetic field structure of the Galactic plane from differential analysis of interstellar polarization
Nagata, Tetsuya; Zenko, Tetsuya; Matsunaga, Noriyuki +4 more
A new method for measuring the global magnetic field structure of the Galactic plane is presented. We have determined the near-infrared polarization of field stars around 52 Cepheids found in recent surveys toward the Galactic plane. The Cepheids are located at the galactic longitudes $-10^{\circ} \le l \le +10.^{\!\!\!\circ }5$ and latitudes $-0.…
Spectral Analysis of Forbush Decreases Using a New Yield Function
Livada, M.; Mavromichalaki, H.
The Forbush decreases of the cosmic ray intensity observed on 24 December 2014 and on 8 September 2017 were chosen for cosmic ray spectral analysis. At first an analytical study of the solar and geomagnetic parameters of these events was carried out due to the fact that both are typical cosmic ray events. Hourly cosmic ray data of the neutron moni…
Identifying the lens galaxy B 1152+199 as a ghostly damped Lyman α system by the cosmic origins spectrograph
Chen, Bin; Dai, Xinyu; Bhatiani, Saloni
Strong quasar-galaxy lensing provides a powerful tool to probe the interstellar medium (ISM) of the lens galaxy using radiation from the background quasar. Using the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescope, we study the cold ISM properties of the lens galaxy in B 1152+199 at a redshift of z = 0.4377. Since existing op…
Redshift Determinations from a Self-consistent Grid-based Lens Model for the Hubble Frontiers Field Cluster RXC J2248.7-4431 (AS1063)
Broadhurst, Tom; Coe, Dan; Lim, Jeremy +3 more
We present an iterative method to construct a freeform lens model that self-consistently reproduces the sky positions, geometrically inferred redshifts, and relative brightnesses of all multiply lensed images toward a galaxy cluster. This method is applied to the cluster RXC J2248.7-4431 (z = 0.348) from the Hubble Frontier Fields program, toward …
Solar physics in the 2020s: DKIST, parker solar probe, and solar orbiter as a multi-messenger constellation
Parenti, S.; Andretta, V.; Cranmer, S. R. +20 more
The National Science Foundation (NSF) Daniel K. Inouye Solar Telescope (DKIST) is about to start operations at the summit of Haleakala (Hawaii). DKIST will join the early science phases of the NASA and ESA Parker Solar Probe and Solar Orbiter encounter missions. By combining in-situ measurements of the near-sun plasma environment and detail remote…