Search Publications
Magnetic Flux Cancelation as the Trigger of Solar Coronal Jets in Coronal Holes
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We investigate in detail the magnetic cause of minifilament eruptions that drive coronal-hole jets. We study 13 random on-disk coronal-hole jet eruptions, using high-resolution X-ray images from the Hinode/X-ray telescope(XRT), EUV images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA), and magnetograms from the SDO/He…
Likely transiting exocomets detected by Kepler
Vanderburg, A.; Kraus, A.; Rappaport, S. +8 more
We present the first good evidence for exocomet transits of a host star in continuum light in data from the Kepler mission. The Kepler star in question, KIC 3542116, is of spectral type F2V and is quite bright at Kp = 10. The transits have a distinct asymmetric shape with a steeper ingress and slower egress that can be ascribed to objects with a t…
Accretion Disks and Coronae in the X-Ray Flashlight
Maccarone, Thomas J.; Li, Jian; Kretschmar, Peter +10 more
Plasma accreted onto the surface of a neutron star can ignite due to unstable thermonuclear burning and produce a bright flash of X-ray emission called a Type-I X-ray burst. Such events are very common; thousands have been observed to date from over a hundred accreting neutron stars. The intense, often Eddington-limited, radiation generated in the…
The ultraviolet spectroscopic evolution of the low-luminosity tidal disruption event iPTF16fnl
Kochanek, C. S.; Stanek, K. Z.; Shappee, B. J. +14 more
We present the ultraviolet (UV) spectroscopic evolution of a tidal disruption event (TDE) for the first time. After the discovery of the nearby TDE iPTF16fnl, we obtained a series of observations with the Space Telescope Imaging Spectrograph (STIS) onboard the Hubble Space Telescope (HST). The dominant emission features closely resemble those seen…
MAHALO Deep Cluster Survey I. Accelerated and enhanced galaxy formation in the densest regions of a protocluster at z = 2.5
Prochaska, J. Xavier; Cai, Zheng; Suzuki, Tomoko L. +6 more
We carried out deep H α narrowband imaging with 10 h net integrations towards the young protocluster, USS1558-003 at z = 2.53 with the Subaru Telescope. This system is composed of four dense groups with massive local overdensities, traced by 107 H α emitters (HAEs) with stellar masses and dust-corrected star formation rates down to 1 × 108
Electron Power-Law Spectra in Solar and Space Plasmas
Retinò, A.; Khotyaintsev, Y. V.; Eriksson, E. +10 more
Particles are accelerated to very high, non-thermal energies in solar and space plasma environments. While energy spectra of accelerated electrons often exhibit a power law, it remains unclear how electrons are accelerated to high energies and what processes determine the power-law index δ . Here, we review previous observations of the power-law i…
Relieving the tension between weak lensing and cosmic microwave background with interacting dark matter and dark energy models
Feng, Chang; Wang, Bin; An, Rui
We constrain interacting dark matter and dark energy (IDMDE) models using a 450-degree-square cosmic shear data from the Kilo Degree Survey (KiDS) and the angular power spectra from Planck's latest cosmic microwave background measurements. We revisit the discordance problem in the standard Lambda cold dark matter (ΛCDM) model between weak lensing …
The VMC survey - XXVI. Structure of the Small Magellanic Cloud from RR Lyrae stars
van Loon, J. Th.; Clementini, G.; Ripepi, V. +10 more
We present results from the analysis of 2997 fundamental mode RR Lyrae variables located in the Small Magellanic Cloud (SMC). For these objects, near-infrared time series photometry from the VISTA survey of the Magellanic Clouds system (VMC) and visual light curves from the OGLE IV (Optical Gravitational Lensing Experiment IV) survey are available…
Indirect detection of neutrino portal dark matter
Batell, Brian; Han, Tao; Shams Es Haghi, Barmak
We investigate the feasibility of the indirect detection of dark matter in a simple model using the neutrino portal. The model is very economical, with right-handed neutrinos generating neutrino masses through the type-I seesaw mechanism and simultaneously mediating interactions with dark matter. Given the small neutrino Yukawa couplings expected …
Obscured star formation in bright z ≃ 7 Lyman-break galaxies
Bowler, R. A. A.; McLure, R. J.; Dunlop, J. S. +2 more
We present Atacama Large Millimeter/Submillimeter Array observations of the rest-frame far-infrared (FIR) dust continuum emission of six bright Lyman-break galaxies (LBGs) at z ≃ 7. One LBG is detected (5.2σ at peak emission), whilst the others remain individually undetected at the 3σ level. The average FIR luminosity of the sample is found to be …