Search Publications
Strong-lensing Analysis of the Powerful Lensing Cluster MACS J2135.2-0102 (z = 0.33)
Broadhurst, Tom; Zitrin, Adi
We present a light-traces-mass (LTM) strong-lensing model of the massive lensing cluster MACS J2135.2-0102 (z = 0.33 hereafter MACS2135), known in part for hosting the cosmic eye galaxy lens. MACS2135 is also known to multiply lens a z = 2.3 sub-millimeter galaxy near the brightest cluster galaxy (BCG), as well as a prominent, triply imaged system…
Redefining the Boundaries of Interplanetary Coronal Mass Ejections from Observations at the Ecliptic Plane
Guerrero, A.; Cid, C.; Saiz, E. +1 more
On 2015 January 6-7, an interplanetary coronal mass ejection (ICME) was observed at L1. This event, which can be associated with a weak and slow coronal mass ejection, allows us to discuss the differences between the boundaries of the magnetic cloud and the compositional boundaries. A fast stream from a solar coronal hole surrounding this ICME off…
Breakout Reconnection Observed by the TESIS EUV Telescope
Reva, A. A.; Ulyanov, A. S.; Kuzin, S. V. +1 more
We present experimental evidence of the coronal mass ejection (CME) breakout reconnection, observed by the TESIS EUV telescope. The telescope could observe solar corona up to 2 R⊙ from the Sun center in the Fe 171 Å line. Starting from 2009 April 8, TESIS observed an active region (AR) that had a quadrupolar structure with an X-point 0.…
Suprathermal Electrons in Titan’s Sunlit Ionosphere: Model-Observation Comparisons
Coates, A. J.; Wahlund, J. -E.; Edberg, N. J. T. +8 more
The dayside ionosphere of the Saturnian satellite Titan is generated mainly from photoionization of N2 and CH4. We compare model-derived suprathermal electron intensities with spectra measured by the Cassini Plasma Spectrometer/Electron Spectrometer (CAPS/ELS) in Titan's sunlit ionosphere (altitudes of 970-1250 km) focusing o…
Ion injection at Quasi-parallel Shocks Seen by the Cluster Spacecraft
Dandouras, I.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
Collisionless shocks in space plasma are known to be capable of accelerating ions to very high energies through diffusive shock acceleration (DSA). This process requires an injection of suprathermal ions, but the mechanisms producing such a suprathermal ion seed population are still not fully understood. We study acceleration of solar wind ions re…
Seasonal Evolution on the Nucleus of Comet C/2013 A1 (Siding Spring)
Samarasinha, Nalin H.; A'Hearn, Michael F.; Bodewits, Dennis +6 more
We observed Comet C/Siding Spring using the Hubble Space Telescope (HST) during its close approach to Mars. The high spatial resolution images obtained through the F689M, F775W, and F845M filters reveal the characteristics of the dust coma. The dust production rate of C/Siding Spring, quantified by Afρ, is 590 ± 30, 640 ± 30, and 670 ± 30 cm in a …
Star Formation in Ultraluminous Infrared Galaxies Probed with AKARI Near-infrared Spectroscopy
Nakagawa, Takao; Isobe, Naoki; Shirahata, Mai +1 more
We conducted systematic observations of the H I Brα line (4.05 µm) and the polycyclic aromatic hydrocarbon (PAH) feature (3.3 µm) in 50 nearby (z\lt 0.3) ultraluminous infrared galaxies (ULIRGs) with AKARI. The Brα line is predicted to be the brightest among the H I lines under conditions of high dust extinction ({A}V\gt 15 …
Bayesian Analysis of Two Stellar Populations in Galactic Globular Clusters. II. NGC 5024, NGC 5272, and NGC 6352
Jefferys, W. H.; Stenning, D. C.; Wagner-Kaiser, R. +5 more
We use Cycle 21 Hubble Space Telescope (HST) observations and HST archival Advanced Camera for Surveys Treasury observations of Galactic Globular Clusters to find and characterize two stellar populations in NGC 5024 (M53), NGC 5272 (M3), and NGC 6352. For these three clusters, both single and double-population analyses are used to determine a best…
From the LIR-T Relation to the Limited Sizes of Dusty Starbursting Regions at High Redshifts
Yan, Haojing; Ma, Zhiyuan
Using the far-infrared (IR) data obtained by the Herschel Space Observatory, we study the relation between the IR luminosity (LIR) and the dust temperature (T) of dusty starbursting galaxies at high redshifts (high-z). We focus on the total IR luminosity from the cold-dust component ({L}{IR}({cd)}), whose emission …
Wide Field CO Mapping in the Region of IRAS 19312+1950
Zhang, Yong; Hsia, Chih-Hao; Yung, Bosco H. K. +3 more
We report the results of wide field CO mapping in the region of IRAS 19312+1950. This Infrared Astronomical Satellite (IRAS) object exhibits SiO/H2O/OH maser emission, and is embedded in a chemically rich molecular component, the origin of which is still unknown. In order to reveal the entire structure and gas mass of the surrounding mo…