Search Publications
Missions
Journals
Publication Years
QU Vul: An integral field spectroscopy case study of a nova shell
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
We present GTC MEGARA high-dispersion integral field spectroscopic observations of the nova remnant QU Vul, which provide a comprehensive 3D view of this nova shell. The tomographic analysis of the H α emission reveals a complex physical structure characterized by an inhomogeneous and clumpy distribution of the material within this shell. The over…
New Results from the Spectral Observations of Solar Coronal Type II Radio Bursts
Ramesh, R.; Kathiravan, C.; Natarajan, S. Surya
We carried out a statistical study of twenty-six type II radio bursts from the Sun observed with the Gauribidanur Low-frequency Solar Spectrograph in the frequency range 85-35 MHz during the period 2009-2019. Our results indicate that the average instantaneous bandwidth of the type II bursts in the above frequency range correlates with the angular…
Broadband X-Ray Spectral Analysis of the Dual AGN System Mrk 739
Tanimoto, Atsushi; Ueda, Yoshihiro; Ricci, Claudio +4 more
We present the result of a broadband (0.5-70 keV) X-ray spectral analysis of the late-merger galaxy Mrk 739, which contains a dual active galactic nucleus (AGN), Mrk 739E and Mrk 739W, with a separation of ≈3.4 kpc. The spectra obtained with NuSTAR, Chandra, XMM-Newton, and Swift/BAT are simultaneously analyzed by separating the contributions from…
Spectra of Cosmic-Ray Sodium and Aluminum and Unexpected Aluminum Excess
Jóhannesson, G.; Moskalenko, I. V.; Porter, T. A. +11 more
Since its launch, the Alpha Magnetic Spectrometer-02 (AMS-02) has delivered outstanding quality measurements of the spectra of cosmic-ray (CR) species, $\bar{p}$ , e ±, and nuclei (H-Si, Fe), which resulted in a number of breakthroughs. The most recent AMS-02 result is the measurement of the spectra of CR sodium and aluminum up to ~2 TV…
Discovery of Year-scale Time Variability from Thermal X-Ray Emission in Tycho's Supernova Remnant
Yamaguchi, Hiroya; Uchida, Hiroyuki; Tsuru, Takeshi Go +2 more
Mechanisms of particle heating are crucial to understanding the shock physics in supernova remnants (SNRs). However, there has been little information on time variabilities of thermalized particles so far. Here, we present a discovery of a gradually brightening thermal X-ray emission found in the Chandra data of Tycho's SNR obtained during 2000-20…
Core orientations and magnetic fields in isolated molecular clouds
Soam, Archana; Lee, Chang Won; Sharma, Ekta +2 more
Molecular clouds are sites of star formation. Magnetic fields are believed to play an important role in their dynamics and shaping morphology. We aim to study any possible correlation that might exist between the magnetic fields orientation inside the clouds and the magnetic fields at envelope scales and their connection with respect to the observ…
Polarization from Aligned Dust Grains in the β Pic Debris Disk
Hughes, A. Meredith; Hull, Charles L. H.; Le Gouellec, Valentin J. M. +8 more
We present 870 µm Atacama Large Millimeter/submillimeter Array polarization observations of thermal dust emission from the iconic, edge-on debris disk β Pic. While the spatially resolved map does not exhibit detectable polarized dust emission, we detect polarization at the ~3σ level when averaging the emission across the entire disk. The cor…
An Optical Spectrum of the Diffuse Galactic Light from BOSS and IRIS
Hensley, Brandon S.; Brandt, Timothy D.; Draine, Bruce T. +2 more
We present a spectrum of the diffuse Galactic light (DGL) between 3700 and 10,000 Å, obtained by correlating optical sky intensity with far-infrared dust emission. We use nearly 250,000 blank-sky spectra from BOSS/SDSS-III together with IRIS-reprocessed maps from the IRAS satellite. The larger sample size compared to SDSS-II results in a factor-of…
Observations of cross scale energy transfer in the inner heliosphere by Parker Solar Probe
Parashar, Tulasi N.; Matthaeus, William H.
The solar wind, a continuous flow of plasma from the sun, not only shapes the near Earth space environment but also serves as a natural laboratory to study plasma turbulence in conditions that are not achievable in the lab. Starting with the Mariners, for more than five decades, multiple space missions have enabled in-depth studies of solar wind t…
In the Trenches of the Solar-Stellar Connection. VI. Total EclipSS
Buzasi, Derek; Ayres, Thomas
The Ecliptic poles Stellar Survey (EclipSS; 2018-2019) collected Hubble Space Telescope/Cosmic Origins Spectrograph (COS) 1150-1420 Å spectra of 49 FGK dwarfs at high ecliptic latitudes. These regions are favored by the scanning programs of the Transiting Exoplanet Survey Satellite (TESS; high-precision optical light curves) and Extended Roentgen …