Search Publications
Convective Bursts and the Coupling of Saturn's Equatorial Storms and Interior Rotation
Heimpel, Moritz; Aurnou, Jonathan M.
Temporal variations of Saturn's equatorial jet and magnetic field hint at rich dynamics coupling the atmosphere and the deep interior. However, it has been assumed that rotation of the interior dynamo must be steady over tens of years of modern observations. Here we use a numerical convection model and scaling estimates to show how equatorial conv…
Spatially Resolved Kinematics of the Central Regions of M83: Hidden Mass Signatures and the Role of Supernovae
Colina, L.; Davies, R.; Orban de Xivry, G. +1 more
The barred grand-design spiral M83 (NGC 5236) is one of the most studied galaxies given its proximity, orientation, and particular complexity. Nonetheless, many aspects of the central regions remain controversial, conveying our limited understanding of the inner gas and stellar kinematics, and ultimately of the nucleus evolution. In this work, we …
Relaxation of Magnetic Field Relative to Plasma Density Revealed from Microwave Zebra Patterns Associated with Solar Flares
Yu, Sijie; Tan, Baolin; Yan, Yihua
It is generally considered that the emission of microwave zebra pattern (ZP) structures requires high density and high temperature, which is similar to the situation of the flaring region where primary energy is released. Therefore, a parameter analysis of ZPs may reveal the physical conditions of the flaring source region. This work investigates …
Deep Ultraviolet Luminosity Functions at the Infall Region of the Coma Cluster
Hornschemeier, A. E.; Smith, R.; Mobasher, B. +5 more
We have used deep GALEX observations at the infall region of the Coma cluster to measure the faintest ultraviolet (UV) luminosity functions (LFs) presented for a rich galaxy cluster thus far. The Coma UV LFs are measured to M UV = -10.5 in the GALEX FUV and NUV bands, or 3.5 mag fainter than previous studies, and reach the dwarf early-t…
The Taiwan ECDFS Near-Infrared Survey: Very Bright End of the Luminosity Function at z > 7
Tsai, Chao-Wei; Yan, Haojing; Ho, Paul T. P. +5 more
The primary goal of the Taiwan ECDFS Near-Infrared Survey (TENIS) is to find well-screened galaxy candidates at z > 7 (z' dropout) in the Extended Chandra Deep Field-South (ECDFS). To this end, TENIS provides relatively deep J and Ks data (~25.3 ABmag, 5σ) for an area of 0.5 × 0.5 deg. Leveraged with existing data at mid-infrared to …
Nuclear X-Ray Properties of the Peculiar Radio-loud Hidden AGN 4C+29.30
Cheung, C. C.; Stawarz, Ł.; Migliori, G. +4 more
We present results from a study of nuclear emission from a nearby radio galaxy, 4C+29.30, over a broad 0.5-200 keV X-ray band. This study used new XMM-Newton (~17 ks) and Chandra (~300 ks) data, and archival Swift/BAT data from the 58 month catalog. The hard (>2 keV) X-ray spectrum of 4C+29.30 can be decomposed into an intrinsic hard power law …
X-Ray Investigation of the Diffuse Emission around Plausible γ-Ray Emitting Pulsar Wind Nebulae in Kookaburra Region
Takahashi, Tadayuki; Bamba, Aya; Uchiyama, Yasunobu +2 more
We report on the results from Suzaku X-ray observations of the radio complex region called Kookaburra, which includes two adjacent TeV γ-ray sources HESS J1418-609 and HESS J1420-607. The Suzaku observation revealed X-ray diffuse emission around a middle-aged pulsar PSR J1420-6048 and a plausible pulsar wind nebula (PWN) Rabbit with elongated size…
The Observational and Theoretical Tidal Radii of Globular Clusters in M87
Sills, Alison; Harris, William E.; Webb, Jeremy J.
Globular clusters have linear sizes (tidal radii) which theory tells us are determined by their masses and by the gravitational potential of their host galaxy. To explore the relationship between observed and expected radii, we utilize the globular cluster population of the Virgo giant M87. Unusually deep, high signal-to-noise images of M87 are us…
Chandra Observations and Classification of Active Galactic Nucleus Candidates Correlated with Auger UHECRs
Zaw, Ingyin; Terrano, William A.; Farrar, Glennys R.
We report on Chandra X-ray observations of possible active galactic nuclei (AGNs) which have been correlated with ultrahigh energy cosmic rays (UHECRs) observed by the Pierre Auger Collaboration. Combining our X-ray observations with optical observations, we conclude that one-third of the 21 Veron-Cetty Veron (VCV) galaxies correlating with UHECRs…
Looking Deep into the Cat's Eye: Structure and Rotation in the Fast Wind of the PN Central Star of NGC 6543
Prinja, R. K.; Cantiello, M.; Massa, D. L.
We present HST/STIS time-series spectroscopy of the central star of the "Cat's Eye" planetary nebula NGC 6543. Intensive monitoring of the UV lines over a 5.8 hr period reveals well-defined details of large-scale structure in the fast wind, which are exploited to provide new constraints on the rotation rate of the central star. We derive character…