Search Publications
On the Connection between Propagating Solar Coronal Disturbances and Chromospheric Footpoints
De Pontieu, B.; Bryans, P.; McIntosh, S. W. +1 more
The Interface Region Imaging Spectrograph (IRIS) provides an unparalleled opportunity to explore the (thermal) interface between the chromosphere, transition region, and the coronal plasma observed by the Atmospheric Imaging Assembly (AIA) of the Solar Dynamics Observatory (SDO). The SDO/AIA observations of coronal loop footpoints show strong recu…
Near-infrared Spectroscopy of the Y0 WISEP J173835.52+273258.9 and the Y1 WISE J035000.32-565830.2: The Importance of Non-equilibrium Chemistry
Tremblin, P.; Saumon, D.; Morley, Caroline V. +5 more
We present new near-infrared spectra, obtained at Gemini Observatory, for two Y dwarfs: WISE J035000.32-565830.2 (W0350) and WISEP J173835.52+273258.9 (W1738). A FLAMINGOS-2 R = 540 spectrum was obtained for W0350, covering 1.0\lt λ µ {{m}} \lt 1.7, and a cross-dispersed Gemini near-infrared spectrograph R = 2800 spectrum was obtained for W1…
Oscillatory Response of the Solar Chromosphere to a Strong Downflow Event above a Sunspot
Chae, Jongchul; Song, Donguk; Madjarska, Maria S. +3 more
We report three-minute oscillations in the solar chromosphere driven by a strong downflow event in a sunspot. We used the Fast Imaging Solar Spectrograph of the 1.6 m New Solar Telescope and the Interface Region Imaging Spectrograph (IRIS). The strong downflow event is identified in the chromospheric and transition region lines above the sunspot u…
Interrupted Eruption of Large Quiescent Filament Associated with a Halo CME
Filippov, Boris; Chandra, Ramesh; Gosain, S. +1 more
We analyze the observations of an eruptive quiescent filament associated with a halo Coronal Mass Ejection (CME). We use observations from the Atmospheric Imaging Assembly (AIA) instrument onboard the Solar Dynamics Observatory (SDO), Solar and Heliospheric Observatory (SOHO)/Large Angle and Spectrometric Coronagraph (LASCO), and the Solar Terrest…
The Stellar Mass Fundamental Plane and Compact Quiescent Galaxies at z < 0.6
Hwang, Ho Seong; Geller, Margaret J.; Damjanov, Ivana +2 more
We examine the evolution of the relation between stellar mass surface density, velocity dispersion, and half-light radius—the stellar mass fundamental plane (MFP)—for quiescent galaxies at z < 0.6. We measure the local relation from galaxies in the Sloan Digital Sky Survey and the intermediate redshift relation from ∼500 quiescent galaxies with…
Unveiling the Physics of Low-luminosity AGNs through X-Ray Variability: LINER versus Seyfert 2
González-Martín, O.; Perea, J.; Márquez, I. +2 more
X-ray variability is very common in active galactic nuclei (AGNs), but these variations may not occur similarly in different families of AGNs. We aim to disentangle the structure of low-ionization nuclear emission-line regions (LINERs) compared to Seyfert 2s by the study of their spectral properties and X-ray variations. We assembled the X-ray spe…
PALOMA: A Magnetic CV between Polars and Intermediate Polars
Pandey, J. C.; Singh, K. P.; Joshi, Arti +1 more
We present analyses of archival X-ray data obtained from the XMM-Newton satellite and optical photometric data obtained from 1 m class telescopes of ARIES, Nainital of a magnetic cataclysmic variable (MCV) Paloma. Two persistent periods at 156 ± 1 minutes and 130 ± 1 minutes are present in the X-ray data, which we interpret as the orbital and spin…
A Solar Flare Disturbing a Light Wall above a Sunspot Light Bridge
Hou, Yijun; Li, Ting; Yang, Shuhong +3 more
With the high-resolution data from the Interface Region Imaging Spectrograph, we detect a light wall above a sunspot light bridge in the NOAA active region (AR) 12403. In the 1330 Å slit-jaw images, the light wall is brighter than the ambient areas while the wall top and base are much brighter than the wall body, and it keeps oscillating above the…
Suzaku X-ray Observations of the Nearest Non-Cool Core Cluster, Antlia: Dynamically Young but with Remarkably Relaxed Outskirts
Sarazin, Craig L.; Reiprich, Thomas H.; Wik, Daniel R. +4 more
We present the results of seven Suzaku mosaic observations (>200 ks in total) of the nearest non-cool core cluster, the Antlia Cluster (or Group), beyond its degree-scale virial radius in its eastern direction. The temperature is consistent with the scaled profiles of many other clusters. Its pressure follows the universal profile. The density …
The Supernova Impostor PSN J09132750+7627410 and Its Progenitor
Zaggia, S.; Ochner, P.; Cappellaro, E. +11 more
We report the results of our follow-up campaign of the supernova impostor PSN J09132750+7627410, based on optical data covering ∼250 days. From the beginning, the transient shows prominent narrow Balmer lines with P-Cygni profiles, with a blueshifted absorption component becoming more prominent with time. Along the ∼3 months of the spectroscopic m…