Search Publications
Variations of the ISM Compactness Across the Main Sequence of Star Forming Galaxies: Observations and Simulations
Zezas, A.; Groves, B.; Ashby, M. L. N. +7 more
The majority of star-forming galaxies follow a simple empirical correlation in the star formation rate (SFR) versus stellar mass (M*) plane, of the form {{SFR}}\propto {M}*α , usually referred to as the star formation main sequence (MS). The physics that sets the properties of the MS is currently a subject of debat…
NuSTAR Observations of Magnetar 1E 1048.1-5937
Yang, C.; Guillot, S.; Kaspi, V. M. +5 more
We report on simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR) and XMM-Newton observations of the magnetar 1E 1048.1-5937, along with Rossi X-ray Timing Explorer (RXTE) data for the same source. The NuSTAR data provide a clear detection of this magnetar’s persistent emission up to 20 keV. We detect a previously unreported small secondary…
Testing Relativistic Reflection and Resolving Outflows in PG 1211+143 with XMM-Newton and NuSTAR
Vaughan, S.; Reeves, J. N.; Pounds, K. +1 more
We analyze the broad-band X-ray spectrum (0.3-50 keV) of the luminous Seyfert 1/quasar PG 1211+143—the archetypal source for high-velocity X-ray outflows—using near-simultaneous XMM-Newton and NuSTAR observations. We compare pure relativistic reflection models with a model including the strong imprint of photoionized emission and absorption from a…
Constraining White Dwarf Structure and Neutrino Physics in 47 Tucanae
Kalirai, J. S.; Heyl, J.; Tremblay, P. E. +2 more
We present a robust statistical analysis of the white dwarf cooling sequence in 47 Tucanae. We combine Hubble Space Telescope UV and optical data in the core of the cluster, Modules for Experiments in Stellar Evolution (MESA) white dwarf cooling models, white dwarf atmosphere models, artificial star tests, and a Markov Chain Monte Carlo sampling m…
Multi-wavelength Observations of a Subarcsecond Penumbral Transient Brightening Event
Su, J. T.; Cao, W. D.; Deng, Y. Y. +3 more
We report a subarcsecond penumbral transient brightening event with the high-spatial resolution observations from the 1.6 m New Solar Telescope (NST), Interface Region Imaging Spectrograph (IRIS), and the Solar Dynamics Observatory. The transient brightening, whose thermal energy is in the range of nanoflares, has signatures in the chromosphere, t…
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…