Search Publications
Determining the Spectral Content of MOSES Images
Kankelborg, Charles C.; Parker, Jacob D.
The Multi-Order Solar Extreme Ultraviolet Spectrograph (MOSES) sounding rocket was launched from White Sands Missile Range on 2006 February 8th, to capture images of the Sun in the He II 303.8 Å emission line. MOSES is a slitless spectrograph that forms images in multiple spectral orders simultaneously using a concave diffraction grating in an eff…
The Disk Population in a Distant Massive Protocluster
Tobin, John J.; Wang, Junfeng; Fedriani, Rubén +3 more
The unprecedented angular resolution and sensitivity of the Atacama Large Millimeter/submillimeter Array make it possible to unveil disk populations in distant (>2 kpc), embedded young cluster environments. We have conducted an observation toward the central region of the massive protocluster G286.21+0.16 at 1.3 mm. With a spatial resolution of…
The Electric Field outward of Saturn's Main Rings
Krupp, N.; Roussos, E.; Paranicas, C. +5 more
Cassini data are consistent with a global electric field in Saturn's magnetosphere that points approximately antisunward. The inner radial extent of this field was initially established using Saturn orbit insertion data but measurements of ultrarelativistic electrons from that pass cast some doubt on whether the electric field reaches all the way …
Line Profile Studies of Coronal Active Regions in Fe XII λ195.12 Using Hinode/EIS
Raju, K. P.; Prabhakar, Maya
Coronal active regions are studied using Hinode/EIS observations in the EUV line Fe XII λ195.12 by analyzing their line profiles from 2006 December to 2019 December. The period covers the last 2 yr of solar cycle 23 and solar cycle 24 fully. Active regions are the main source of magnetic field in the solar atmosphere, important in its heating and …
Extreme X-Ray Reflection in the Nucleus of the Seyfert Galaxy NGC 5033
Stern, D.; Brandt, W. N.; Fabian, A. C. +7 more
NGC 5033 is an intriguing Seyfert galaxy because its subclassification may change with time, and because optical and submillimeter observations find that the massive black hole does not sit at the dynamical center of the galaxy, pointing to a past merger. We obtained a new optical spectrum of NGC 5033 using the 200″ Hale telescope at Palomar that …
Milliarcsecond X-Ray Astrometry to Resolve Inner Regions of AGN at z > 1 Using Gravitational Lensing
Barnacka, Anna; Spingola, Cristiana; Schwartz, Daniel
We report the localization of the X-ray emission from two strongly lensed AGN, CLASS B0712+472 (z = 1.34) and CLASS B1608+656 (z = 1.394). We obtain milliarcsecond X-ray astrometry by developing a novel method that combines parametric lens modeling with a Bayesian analysis. We spatially locate the X-ray sources in CLASS B0712+472 and CLASS B1608+6…
FAST Search for Circumstellar Atomic Hydrogen. I. The Young Planetary Nebula IC 4997
Zhang, Yong; Zhang, Chuan-Peng; Parker, Quentin A. +3 more
Using the Five-hundred-meter Aperture Spherical radio Telescope in Guizhou, China, we detect the 21 cm neutral atomic hydrogen absorption in the young planetary nebula IC 4997. The absorption arises from a shell that is also associated with Na I D lines. The H I shell has a mass of 1.46 × 10-2 M ⊙ and a dynamic age of 990 yr.…
Extreme Solar Flare-driven Short-wave Fadeout Observed by SuperDARN ZHO Radar
Wang, M.; Liu, J.; Lu, J. Y. +6 more
Based on the observations from the Super Dual Auroral Radar Network at the Zhongshan Station (-74.9 MLAT, 97.2 MLON) and GOES satellites X-ray sensor, we present the first statistical study of the dayside ionospheric short-wave fadeout (SWF) events on the Southern Hemispheric high latitude from the years 2010-2019 and provide a normal characterist…
Spectroscopic Diagnostics of the Mid-infrared Features of the Dark Globule DC 314.8-5.1 with the Spitzer Space Telescope
Stawarz, Ł.; Rocha, W. R. M.; Kosmaczewski, E. +2 more
We present an analysis of the mid-infrared spectra, obtained from the Spitzer Space Telescope, of the dark globule DC 314.8-5.1, which is at the onset of low-mass star formation. The target has a serendipitous association with a B-type field star that illuminates a reflection nebula in the cloud. We focus on the polycyclic aromatic hydrocarbon (PA…
TIC 5724661: A Long-period Binary with a Pulsating sdB Star and δ Scuti Variable
Rappaport, Saul A.; Jayaraman, Rahul; Bieryla, Allyson +8 more
Using TESS 20 s cadence data, we have discovered an unusual combination of pulsating stars in what we infer to be a binary system. The binary consists of a standard δ Scuti star with pulsations over the range 32-41 day-1; this is in a likely wide orbit with a hot subdwarf-B (sdB) star, which itself has a large-amplitude p-mode pulsation…