Search Publications
Multiple Rings in the Transitional Disk of GM Aurigae Revealed by VLA and ALMA
Schwarz, Kamber R.; Carrasco-González, Carlos; Ribas, Álvaro +6 more
Our understanding of protoplanetary disks is rapidly departing from the classical view of a smooth, axisymmetric disk. This is in part thanks to the high angular resolution that (sub)millimeter observations can provide. Here, we present the combined results of Atacama Large Millimeter/submillimeter Array (ALMA) (0.9 mm) and Very Large Array (VLA) …
A New Tool for CME Arrival Time Prediction using Machine Learning Algorithms: CAT-PUMA
Wang, Yuming; Shen, Chenglong; Liu, Jiajia +2 more
Coronal mass ejections (CMEs) are arguably the most violent eruptions in the solar system. CMEs can cause severe disturbances in interplanetary space and can even affect human activities in many aspects, causing damage to infrastructure and loss of revenue. Fast and accurate prediction of CME arrival time is vital to minimize the disruption that C…
Spectroscopic Observations of a Current Sheet in a Solar Flare
Feng, L.; Gan, W. Q.; Cheng, X. +6 more
The current sheet is believed to be the region of energy dissipation via magnetic reconnection in solar flares. However, its properties, for example, the dynamic process, are not fully understood. Here, we report a current sheet in a solar flare (SOL2017-09-10T16:06) that was clearly observed by the Atmospheric Imaging Assembly on board the Solar …
A Spatially Resolved au-scale Inner Disk around DM Tau
Dong, Ruobing; Liu, Hauyu Baobab; Tsukagoshi, Takashi +5 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the dust continuum emission at 1.3 mm and 12CO J=2\to 1 line emission of the transitional disk around DM Tau. DM Tau’s disk is thought to possess a dust-free inner cavity inside a few au, from the absence of near-infrared excess on its spectral energy distrib…
Baryon Budget of the Hot Circumgalactic Medium of Massive Spiral Galaxies
Bregman, Joel N.; Anderson, Michael E.; Crain, Robert A. +2 more
The baryon content around local galaxies is observed to be much less than is needed in Big Bang nucleosynthesis. Simulations indicate that a significant fraction of these “missing baryons” may be stored in a hot tenuous circumgalactic medium (CGM) around massive galaxies extending to or even beyond the virial radius of their dark matter halos. Pre…
Simultaneous Chandra and VLA Observations of the Transitional Millisecond Pulsar PSR J1023+0038: Anti-correlated X-Ray and Radio Variability
Deller, Adam T.; Bogdanov, Slavko; Hessels, Jason W. T. +6 more
We present coordinated Chandra X-ray Observatory and Karl G. Jansky Very Large Array observations of the transitional millisecond pulsar PSR J1023+0038 in its low-luminosity accreting state. The unprecedented five hours of strictly simultaneous X-ray and radio continuum coverage for the first time unambiguously show a highly reproducible, anti-cor…
Revealing the Environmental Dependence of Molecular Gas Content in a Distant X-Ray Cluster at z = 2.51
Kohno, Kotaro; Daddi, Emanuele; Koyama, Yusei +13 more
We present a census of the molecular gas properties of galaxies in the most distant known X-ray cluster, CLJ1001, at z = 2.51, using deep observations of CO(1-0) with the Karl G. Jansky Very Large Array. In total, 14 cluster members with M * > 1010.5 M ⊙ are detected, including all of the massive star-forming me…
A New Relativistic Component of the Accretion Disk Wind in PDS 456
Reeves, J. N.; Braito, V.; Nardini, E. +3 more
Past X-ray observations of the nearby luminous quasar PDS 456 (at z = 0.184) have revealed a wide angle accretion disk wind, with an outflow velocity of ∼-0.25c. Here, we unveil a new, relativistic component of the wind through hard X-ray observations with NuSTAR and XMM-Newton, obtained in 2017 March when the quasar was in a low-flux state. This …
A Long Decay of X-Ray Flux and Spectral Evolution in the Supersoft Active Galactic Nucleus GSN 069
Shu, X. W.; Wang, J. X.; Wang, T. G. +3 more
GSN 069 is an optically identified very low-mass active galactic nuclei (AGN) that shows supersoft X-ray emission. The source is known to exhibit a huge X-ray outburst, with flux increased by more than a factor of ∼240 compared to the quiescence state. We report its long-term evolution in the X-ray flux and spectral variations over a timescale of …
Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. II. Spatially Resolved Mass Outflow Rates for the QSO2 Markarian 34
Kraemer, S. B.; Crenshaw, D. M.; Gandhi, P. +10 more
We present spatially resolved mass outflow rate measurements ({\dot{M}}out}) for the narrow line region of Markarian 34, the nearest Compton-thick type 2 quasar (QSO2). Spectra obtained with the Hubble Space Telescope and at Apache Point Observatory reveal complex kinematics, with distinct signatures of outflow and rotation within 2 kpc…