Search Publications
SHARDS Frontier Fields: Physical Properties of a Low-mass Lyα Emitter at z = 5.75
Pérez-González, Pablo G.; Richard, Johan; Conselice, Christopher J. +20 more
We analyze the properties of a multiply imaged Lyα (Lyα) emitter at z = 5.75 identified through SHARDS Frontier Fields intermediate-band imaging of the Hubble Frontier Fields (HFF) cluster Abell 370. The source, A370-L57, has low intrinsic luminosity (M UV ∼ -16.5), steep UV spectral index (β = -2.4 ± 0.1), and extreme rest-frame equiva…
Growth rate measurement of ULF waves in the ion foreshock
Hietala, H.; Angelopoulos, V.; Dorfman, S. +1 more
We report the first satellite measurement of the ultralow frequency (ULF) wave growth rate in the upstream region of the Earth's bow shock. We employ the two identical ARTEMIS spacecraft orbiting the Moon to characterize crescent-shaped reflected ion beams and relatively monochromatic ULF waves. The event presented here features spacecraft separat…
Characterizing dw1335-29, a recently discovered dwarf satellite of M83
Bell, Eric F.; Monachesi, Antonela; Bailin, Jeremy +4 more
The number, distribution and properties of dwarf satellites are crucial probes of the physics of galaxy formation at low masses and the response of satellite galaxies to the tidal and gas dynamical effects of their more massive parent. To make progress, it is necessary to augment and solidify the census of dwarf satellites of galaxies outside the …
Gaia eclipsing binary and multiple systems. Supervised classification and self-organizing maps
Rimoldini, L.; Holl, B.; Mowlavi, N. +6 more
Context. Large surveys producing tera- and petabyte-scale databases require machine-learning and knowledge discovery methods to deal with the overwhelming quantity of data and the difficulties of extracting concise, meaningful information with reliable assessment of its uncertainty. This study investigates the potential of a few machine-learning m…
Calibrating the Planck Cluster Mass Scale with Cluster Velocity Dispersions
Chary, Ranga-Ram; Stern, Daniel; Shim, Hyunjin +7 more
We measure the Planck cluster mass bias using dynamical mass measurements based on velocity dispersions of a subsample of 17 Planck-detected clusters. The velocity dispersions were calculated using redshifts determined from spectra that were obtained at the Gemini observatory with the GMOS multi-object spectrograph. We correct our estimates for ef…
Pushing the limits: detecting H2 emission from faint bipolar planetary nebulae in the IPHAS sample
Guerrero, M. A.; Santamaría, E.; Ramos-Larios, G. +1 more
We have obtained deep narrowband images in the near-infrared H2 λ2.122 µm emission line for a sample of 15 faint Isaac Newton Telescope Photometric H α Survey (IPHAS) bipolar planetary nebulae (PNe) to search for molecular material. H2 emission is found in most of them (14 out of 15), mostly associated with rings at the…
The Deflection of the Cartwheel CME: ForeCAT Results
Landi, Enrico; Kay, Christina; Capannolo, Luisa +1 more
We analyze the Cartwheel coronal mass ejection's (CME; 2008 April 9) trajectory in the low corona with the ForeCAT model. This complex event presented a significant rotation in the low corona and a reversal in its original latitude direction. We successfully reproduce the observed CME’s trajectory (latitude and longitude deflection) and speed. Thr…
The Roles of Reconnected Flux and Overlying Fields in CME Speeds
Welsch, Brian T.; Deng, Minda
Researchers have reported i) correlations of coronal mass ejection (CME) speeds and the total photospheric magnetic flux swept out by flare ribbons in flare-associated eruptive events, and, separately, ii) correlations of CME speeds and more rapid decay, with height, of magnetic fields in potential-field coronal models above eruption sites. Here, …
IRTF/TEXES observations of the H II regions H1 and H2 in the Galactic Centre
Wang, Q. Daniel; Dong, Hui; Schödel, Rainer +6 more
We present new [Ne II] (12.8 µm) IRTF/TEXES observations of the Galactic Center H II regions H1 and H2, which are at a projected distance of ∼11 pc from the centre of the Galaxy. The new observations allow us to map the radial velocity distributions of ionized gas. The high spectroscopic resolution (∼4 km s-1) helps us to disentan…
Whistler Mode Waves Below Lower Hybrid Resonance Frequency: Generation and Spectral Features
Balikhin, M. A.; Shklyar, D. R.
Equatorial noise in the frequency range below the lower hybrid resonance frequency, whose structure is shaped by high proton cyclotron harmonics, has been observed by the Cluster spacecraft. We develop a model of this wave phenomenon which assumes (as, in general, has been suggested long ago) that the observed spectrum is excited due to loss cone …