Search Publications
IMF dependence of energetic oxygen and hydrogen ion distributions in the near-Earth magnetosphere
Daly, P. W.; Kronberg, E. A.; Nykyri, K. +5 more
Energetic ion distributions in the near-Earth plasma sheet can provide important information for understanding the entry of ions into the magnetosphere and their transportation, acceleration, and losses in the near-Earth region. In this study, 11 years of energetic proton and oxygen observations (> 274 keV) from Cluster/Research with Adaptive P…
Lorentz invariance violation in the neutrino sector: a joint analysis from big bang nucleosynthesis and the cosmic microwave background
Cai, Rong-Gen; Guo, Zong-Kuan; Dai, Wei-Ming +1 more
We investigate constraints on Lorentz invariance violation in the neutrino sector from a joint analysis of big bang nucleosynthesis and the cosmic microwave background. The effect of Lorentz invariance violation during the epoch of big bang nucleosynthesis changes the predicted helium-4 abundance, which influences the power spectrum of the cosmic …
Nearby Young, Active, Late-type Dwarfs in Gaia's First Data Release
Zuckerman, B.; Kastner, Joel H.; Rodriguez, David +3 more
The Galex Nearby Young Star Survey (GALNYSS) has yielded a sample of ∼2000 UV-selected objects that are candidate nearby (D≲ 150 {pc}), young (age ∼ 10-100 Myr), late-type stars. Here, we evaluate the distances and ages of the subsample of (19) GALNYSS stars with Gaia Data Release 1 (DR1) parallax distances D≤slant 120 {pc}. The overall youth of t…
Siriusly, a newly identified intermediate-age Milky Way stellar cluster: a spectroscopic study of Gaia 1
Bernard, E. J.; Tolstoy, E.; Ferguson, A. M. N. +6 more
We confirm the reality of the recently discovered Milky Way stellar cluster Gaia 1 using spectra acquired with the HERMES and AAOmega spectrographs of the Anglo-Australian Telescope. This cluster had been previously undiscovered due to its close angular proximity to Sirius, the brightest star in the sky at visual wavelengths. Our observations iden…
Emission Lines in the Near-infrared Spectra of the Infrared Quintuplet Stars in the Galactic Center
Najarro, F.; Geballe, T. R.; de la Fuente, D. +1 more
We report the detection of a number of emission lines in the 1.0-2.4 µm spectra of four of the five bright-infrared dust-embedded stars at the center of the Galactic center’s (GC) Quintuplet Cluster. Spectroscopy of the central stars of these objects is hampered not only by the large interstellar extinction that obscures all of the objects i…
Prominence Eruption Initiated by Helical Kink Instability of an Embedded Flux Rope
Gopalswamy, N.; Ravindra, B.; Vemareddy, P.
We study the triggering mechanism of a limb-prominence eruption and the associated coronal mass ejection (CME) near AR 12342 using Solar Dynamics Observatory and Large Angle and Spectrometric Coronagraph/Solar Heliospheric Observatory observations. The prominence is seen with an embedded flux thread (FT) at one end and bifurcates from the middle t…
A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU
Hirota, Tomoya; Honma, Mareki; Sorai, Kazuo +7 more
We report on interferometric observations of a face-on accretion system around the high-mass young stellar object, G353.273+0.641. The innermost accretion system of 100 au radius was resolved in a 45 GHz continuum image taken with the Jansky-Very Large Array. Our spectral energy distribution analysis indicated that the continuum could be explained…
Discovery of a Lensed Ultrabright Submillimeter Galaxy at z = 2.0439
Rebolo, R.; Dannerbauer, H.; Díaz-Sánchez, A. +1 more
We report an ultrabright lensed submillimeter galaxy (SMG) at z = 2.0439, WISE J132934.18+224327.3, identified as a result of a full-sky cross-correlation of the AllWISE and Planck compact source catalogs aimed to search for bright analogs of the SMG SMM J2135, the Cosmic Eyelash. Inspection of archival SCUBA-2 observations of the candidates revea…
Structure and dynamics of the molecular gas in M 2-9: a follow-up study with ALMA
Sánchez Contreras, C.; Alcolea, J.; Santander-García, M. +4 more
Context. M 2-9 is a young planetary nebula (PN) that shows the characteristics of its last ejections in unprecedented detail. These last ejections are thought to trigger the post-asymptotic giant branch evolution.
Aims: To assemble an overall picture of how M 2-9 was shaped, we analyzed the characteristics of the different molecular gas compo…
Crossing the Eddington Limit: Examining Disk Spectra at High Accretion Rates
Done, Chris; Soria, Roberto; Swartz, Douglas A. +3 more
The faintest ultraluminous X-ray sources (ULXs), those with 0.3-10 keV luminosities 1< {L}{{X}}/{10}39< 3 {erg} {{{s}}}-1, tend to have X-ray spectra that are disk-like but broader than expected for thin accretion disks. These “broadened disk (BD)” spectra are thought to indicate near- or mildly super-Eddingt…