Search Publications
Inner heliosphere MHD modeling system applicable to space weather forecasting for the other planets
Futaana, Y.; Kataoka, R.; Shiota, D. +5 more
We developed a magnetohydrodynamic (MHD) solar wind model which can be used for practical use in real-time space weather forecasting at Earth's orbit and those of other planets. The MHD simulation covering 3 years (2007-2009) was performed to test the accuracy, and the numerical results show reasonable agreement with in situ measurements of the so…
The bulge-disc decomposed evolution of massive galaxies at 1 < z < 3 in CANDELS
Ferguson, H. C.; Bowler, R. A. A.; McLure, R. J. +15 more
We present the results of a new and improved study of the morphological and spectral evolution of massive galaxies over the redshift range 1 < z < 3. Our analysis is based on a bulge-disc decomposition of 396 galaxies with M* > 1011 M⊙ uncovered from the Cosmic Assembly Near-infrared Deep Extragalactic Leg…
Coronal Magnetic Field Evolution from 1996 to 2012: Continuous Non-potential Simulations
Yeates, A. R.
Coupled flux transport and magneto-frictional simulations are extended to simulate the continuous magnetic-field evolution in the global solar corona for over 15 years, from the start of Solar Cycle 23 in 1996. By simplifying the dynamics, our model follows the build-up and transport of electric currents and free magnetic energy in the corona, off…
Are X-Ray Emitting Coronae around Supermassive Black Holes Outflowing?
Wang, Jun-Xian; Zhu, Fei-Fan; Zhou, You-Yuan +2 more
Hard X-ray emission in radio-quiet active galactic nuclei (AGNs) is believed to be produced via inverse Compton scattering by hot and compact coronae near the supermassive black hole. However, the origin and physical properties of the coronae, including geometry, kinematics, and dynamics, remain poorly known. In this work, taking [O IV] 25.89 &mic…
Distribution of slow and fast rotators in the Fornax cluster
Pimbblet, Kevin A.; Graham, Alister W.; Cappellari, Michele +3 more
We present integral field spectroscopy of 10 early-type galaxies in the nearby, low-mass, Fornax cluster, from which we derive spatially resolved stellar kinematics. Based on the morphologies of their stellar velocity maps we classify 2/10 galaxies as slow rotators, with the remaining eight galaxies fast rotators. Supplementing our integral field …
The complex distribution of recently formed stars. Bimodal stellar clustering in the star-forming region NGC 346
Gouliermis, Dimitrios A.; Klessen, Ralf S.; Hony, Sacha
We present a detailed stellar clustering analysis with the application of the two-point correlation function on distinct young stellar ensembles. Our aim is to understand how stellar systems are assembled at the earliest stages of their formation. Our object of interest is the star-forming region NGC 346 in the Small Magellanic Cloud. It is a youn…
A Magnified View of the Kinematics and Morphology of RCSGA 032727-132609: Zooming in on a Merger at z = 1.7
Rigby, Jane R.; Sharon, Keren; Gladders, Michael D. +1 more
We present a detailed analysis of multi-wavelength Hubble Space Telescope/Wide Field Camera 3 (WFC3) imaging and Keck/OSIRIS near-infrared adaptive optics-assisted integral field spectroscopy for a highly magnified lensed galaxy at z = 1.70. This young starburst is representative of ultraviolet-selected star-forming galaxies (SFGs) at z ~ 2 and co…
Interstellar and Ejecta Dust in the Cas A Supernova Remnant
Arendt, Richard G.; Hwang, Una; Rho, Jeonghee +2 more
Infrared continuum observations provide a means of investigating the physical composition of the dust in the ejecta and swept up medium of the Cas A supernova remnant (SNR). Using low-resolution Spitzer IRS spectra (5-35 µm), and broad-band Herschel PACS imaging (70, 100, and 160 µm), we identify characteristic dust spectra, associated…
Infrared Tip of the Red Giant Branch and Distances to the Maffei/IC 342 Group
Dolphin, Andrew E.; Wu, Po-Feng; Tully, R. Brent +3 more
In this paper, we extend the use of the tip of the red giant branch (TRGB) method to near-infrared wavelengths from the previously used I-band, using the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3). Upon calibration of a color dependency of the TRGB magnitude, the IR TRGB yields a random uncertainty of ~5% in relative distance. The IR …
Stellar feedback as the origin of an extended molecular outflow in a starburst galaxy
Moustakas, J.; Rudnick, G. H.; Krips, M. +6 more
Recent observations have revealed that starburst galaxies can drive molecular gas outflows through stellar radiation pressure. Molecular gas is the phase of the interstellar medium from which stars form, so these outflows curtail stellar mass growth in galaxies. Previously known outflows, however, involve small fractions of the total molecular gas…