Search Publications
The Solar Eruption of 2017 September 10: Wavy with a Chance of Protons
Pizzo, V. J.; de Koning, Curt A.; Seaton, Daniel B.
High-resolution SUVI images reveal an interesting new picture of particle acceleration in powerful solar eruptions. Typically, powerful solar eruptions include a coronal wave component, as well the traditional CME and flare components. At low solar altitudes, coronal waves refract downward, toward the solar surface, because of the slower Alfvén sp…
The CGM-GRB Study. II. Outflow-Galaxy Connection at z 2-6
Cenko, S. Bradley; Veilleux, Sylvain; Perley, Daniel +4 more
We use a sample of 27 gamma-ray bursts (GRBs) at redshift z = 2-6 to probe the outflows in their respective host galaxies (log(M */M ⊙) ~ 9-11) and search for possible relations between the outflow properties and those of the host galaxies, such as M *, the star formation rate (SFR), and the specific SFR (sSFR). Fi…
The Small Separation A-star Companion Population: First Results with CHARA/MIRC-X
Lanthermann, Cyprien; Anugu, Narsireddy; Kraus, Stefan +9 more
We present preliminary results from our long-baseline interferometry (LBI) survey to constrain the multiplicity properties of intermediate-mass A-type stars within 80 pc. Previous multiplicity studies of nearby stars exhibit orbital separation distributions well fitted with a lognormal with peaks >15 au, increasing with primary mass. The A-star…
Identification and Parameter Determination of F-type Herbig Stars from LAMOST DR8
Luo, A. -Li; Hou, Wen; Jiang, Biwei +5 more
We identify 20 F-type Herbig stars and provide a list of 22 pre-main-sequence candidates from LAMOST DR8. The effective temperature, distance, extinction, stellar luminosity, mass, age, and radius are derived for each Herbig star based on optical spectra, photometry, Gaia EDR3 parallaxes, and pre-main-sequence evolutionary tracks. According to spe…
The Radial Evolution of Magnetic Clouds From Helios to Ulysses
Wang, Yuming; Li, Xiaolei; Cai, Qiangwei +5 more
The evolution of a magnetic cloud (MC) from the inner heliosphere to the outer heliosphere has been investigated for decades. Although many studies have reported on the evolution of MCs, there is no relevant statistical study about the continuous parametric evolution of the flux rope model of the Gold-Hoyle solution for MCs from near the Sun to 5.…
Discovery of a Compact X-Ray Object with a 614 s Periodicity in the Direction of the Galactic Center
Gong, Hang
We report on analysis of X-ray, optical, and radio observations of the previously overlooked X-ray source 2CXO J174517.0-321356 located just 3.°2 away from the Galactic center. Timing analysis of X-ray observations of the source with XMM-Newton reveals periodic pulsations with periods of 1228 and 614 s, with the latter being tentatively considered…
Quantitative Evaluation of Coronal Magnetic Field Models Using Tomographic Reconstructions of Electron Density
Arge, C. N.; Henney, C. J.; Wang, T. J. +3 more
We introduce a new quantitative approach for assessing the quality of coronal magnetic field models. The method compares the location of the magnetic neutral line at a specified height in the magnetic field model with the locations of localized density peaks in the coronal electron density, as measured using coronal rotational tomography. This app…
Observations of Current Sheet Heating in X-Ray during a Solar Flare
Reva, A. A.; Kirichenko, A. S.; Ulyanov, A. S. +2 more
In the solar corona, magnetic reconnection occurs due to the finite resistivity of the plasma. At the same time, this resistivity leads to ohmic heating. Therefore, the reconnecting current sheet should heat the surrounding plasma. This paper presents experimental evidence of such plasma heating being caused by magnetic reconnection. We observed t…
Brighter and More Massive Galaxies in the Vicinity of Lyα Nebulae
Wells, Natalie K.; Prescott, Moire K. M.; Finlator, Kristian M.
It has been well established in the local universe that galaxy properties differ based on the large-scale environment in which they reside. As luminous Lyα nebulae have been shown to trace overdense environments at z ~ 2-3, comparing the properties of galaxies within Lyα nebulae systems to those in the field can provide insight into how and when l…
Joint Survey Processing. II. Stellar Proper Motions in the COSMOS Field from Hubble Space Telescope ACS and Subaru Telescope HSC Observations
Fajardo-Acosta, Sergio B.; Faisst, Andreas; Grillmair, Carl J. +4 more
We analyze stellar proper motions in the COSMOS field to assess the presence of bulk motions. At bright magnitudes (G-band 18.5-20.76 AB), we use the proper motions of 1010 stars in the Gaia DR2 catalog. At the faint end, we compute proper motions of 11,519 pointlike objects at i-band magnitudes 19-25 AB using Hubble ACS and Subaru HSC data, which…