Search Publications
Rapid Flaring in the Galactic-plane Gamma-Ray Transient Fermi J0035+6131
Kaaret, Philip; Pandel, Dirk
We investigate the gamma-ray and X-ray emission from the transient gamma-ray source Fermi J0035+6131, which was discovered with the Fermi Large Area Telescope (LAT) near the Galactic plane at b = 1.°3, and we discuss potential multi-wavelength counterparts of the gamma-ray source. Our analysis of over 9 years of Fermi LAT data revealed two flaring…
The Physical Characteristics of Interstellar Medium in NGC 3665 with Herschel Observations
Gu, Qiu-Sheng; Shi, Yong; Zhao, Yinghe +1 more
We present the analysis of the physical properties of the interstellar medium in the nearby early-type galaxy NGC 3665, based on the far-infrared photometric and spectroscopic data as observed by the Herschel Space Observatory. The fit to the spectral energy distribution reveals a high dust content in the galaxy, with a dust-to-stellar mass ratio …
Proper Motion of the Faint Star near KIC 8462852 (Boyajian's Star)—Not a Binary System
Wright, J. T.; Montgomery, J.; Clemens, Dan P. +4 more
A faint star located 2 arcsec from KIC 8462852 was discovered in Keck 10 m adaptive optics imaging in the JHK near-infrared (NIR) in 2014 by Boyajian et al. (2016). The closeness of the star to KIC 8462852 suggested that the two could constitute a binary, which might have implications for the cause of the brightness dips seen by Kepler and in grou…
Proper Motions of Sunspots’ Umbral Dots at High Temporal and Spatial Resolution
Koutchmy, Serge; Goodarzi, Hadis; Adjabshirizadeh, Ali
To deepen the analysis of the photometric properties of the umbra of a sunspot, we study proper motions of small features such as umbral dots (UDs) inside a single sunspot observed by the Solar Optical Telescope of Hinode close to the disk center. We consider horizontal flows with high precision and details to study the transient motion behavior o…
Three-dimensional Oscillations of 21 Halo Coronal Mass Ejections Using Multi-spacecraft Data
Moon, Y. -J.; Lee, Harim; Nakariakov, V. M. +3 more
We investigate the 3D structure of kinematic oscillations of full halo coronal mass ejections (FHCMEs) using multi-spacecraft coronagraph data from two non-parallel lines of sight. For this, we consider 21 FHCMEs which are simultaneously observed by the Solar and Heliospheric Observatory and the Solar TErrestrial RElations Observatory A or B, from…
Detection of a Star-forming Galaxy in the Center of a Low-mass Galaxy Cluster
Lovisari, Lorenzo; Andrade-Santos, Felipe; Jones, Christine +4 more
Brightest Cluster Galaxies (BCGs) residing in the centers of galaxy clusters are typically quenched giant ellipticals. A recent study hinted that star-forming galaxies with large disks, so-called superluminous spirals and lenticulars, are the BCGs of a subset of galaxy clusters. Based on the existing optical data it was not possible to constrain w…
Toward a Measurement of the Transverse Peculiar Velocity of Galaxy Pairs
Darling, Jeremy; Truebenbach, Alexandra E.
The transverse peculiar velocities caused by the mass distribution of large-scale structure (LSS) provide a test of the theoretical matter power spectrum and the cosmological parameters that contribute to its shape. Typically, the matter density distribution of the nearby universe is measured through redshift or line-of-sight peculiar velocity sur…
Revisiting the Iron Abundance in the Hyper Iron-poor Star HE 1327-2326 with UV COS/HST Data
Ezzeddine, Rana; Frebel, Anna
We present a new iron abundance analysis of the hyper metal-poor star HE 1327-2326, based on Fe II lines detected in its UV spectral range for the first time. In a Cosmic Origins Spectrograph (COS) spectrum, five new Fe II lines could be measured. A Si I line was also detected for the first time. We determine a 1D local thermodynamic equilibrium (…
Chandra Observations of NuSTAR Serendipitous Sources near the Galactic Plane
Aird, James; Stern, Daniel; Rahoui, Farid +8 more
The Nuclear Spectroscopic Telescope Array (NuSTAR) serendipitous survey has already uncovered a large number of active galactic nuclei (AGNs), providing new information about the composition of the cosmic X-ray background. For AGNs off the Galactic plane, it has been possible to use existing X-ray archival data to improve source localizations, ide…
Association between Tornadoes and Instability of Hosting Prominences
Poedts, Stefaan; Shergelashvili, Bidzina M.; Mghebrishvili, Irakli +4 more
We studied the dynamics of all prominence tornadoes detected by the Solar Dynamics Observatory/Atmospheric Imaging Assembly from 2011 January 01 to December 31. In total, 361 events were identified during the whole year, but only 166 tornadoes were traced until the end of their lifetime. Out of 166 tornadoes, 80 (48%) triggered CMEs in hosting pro…