Search Publications
NGC 4104: A shell galaxy in a forming fossil group
Adami, C.; Martinet, N.; Cuillandre, J. -C. +4 more
Context. Groups are the most common association of galaxies in the Universe and they are found in different configuration states, such as loose, compact, and fossil groups.
Aims: We studied the galaxy group MKW 4s, dominated by the giant early-type galaxy NGC 4104 at z = 0.0282, with the aim of understanding the evolutionary stage of this gro…
Comparison of terrestrial and Martian TEC at dawn and dusk during solstices
Witasse, Olivier; Sánchez-Cano, Beatriz; Burrell, Angeline G. +2 more
This paper used the similarities between the ionospheres on Mars and Earth, the most similar of the terrestrial planets, to examine the relative importance of photochemical and transport processes at dawn and dusk. The amount of plasma present in the ionosphere, as measured by the total electron content (TEC), was examined at different locations f…
Schumann resonance on Titan: A critical Re-assessment
Lorenz, Ralph D.; Le Gall, Alice
Extremely Low Frequency (ELF) electric field signals recorded by the Huygens probe have previously been interpreted as indicating a Schumann Resonance (SR) in the ionosphere-ocean cavity. This interpretation required accommodation of a number of anomalous features with respect to the terrestrial SR, namely a lack of observed lightning discharges w…
A Strong-lensing Model for the WMDF JWST/GTO Very Rich Cluster A1489
Finkelstein, Steven L.; Koekemoer, Anton M.; Larson, Rebecca L. +19 more
We present a first strong-lensing model for the galaxy cluster RM J121218.5+273255.1 (z = 0.35; hereafter RMJ1212; also known as A1489). This cluster is among the top 0.1% richest clusters in the redMaPPer catalog; it is significantly detected in X-ray and through the Sunyaev-Zel'dovich effect in ROSAT and Planck data, respectively, and its optica…
NGC 6712: the variable star population of a tidally disrupted globular cluster
Arellano Ferro, A.; Calderón, J. H.; Lázaro, C. +4 more
We present an analysis of {VI} CCD time-series photometry of globular cluster NGC 6712. Our main goal is to study the variable star population as indicators of the cluster mean physical parameters. We employed the Fourier decomposition of RR Lyrae light curves to confirm that {}[Fe/H]_{UVES} = -1.0 ± 0.05 is a solid estimate. We estimated the redd…
Non-interacting coronal mass ejections and solar energetic particles near the quadrature configuration of Solar TErrestrial RElations Observatory
Ravishankar, Anitha; Michałek, Grzegorz
We present our results on the correlation of non-interacting coronal mass ejections (CMEs) and solar energetic particles (SEPs). A statistical analysis was conducted on 25 SEP events and the associated CME and flare during the ascending phase of solar cycle 24, i.e., 2009-2013, which marks the quadrature configuration of Solar TErrestrial RElation…
Flickering of the jet‑ejecting symbiotic star MWC 560
Stoyanov, K. A.; Latev, G.; Boeva, S. +4 more
We analyzed the optical photometric data of short‑term variability (flickering) of the accreting white dwarf in the jet‑ejecting symbiotic star MWC 560. The observations were obtained on 17 nights during the period November 2011 to October 2019. The color‑magnitude diagram shows that the hot component of the system becomes redder as it gets bright…
Eruptions from coronal hole bright points: Observations and non-potential modelling
Madjarska, Maria S.; Mackay, Duncan H.; Galsgaard, Klaus +2 more
Context. We report on the third part of a series of studies on eruptions associated with small-scale loop complexes named coronal bright points (CBPs).
Aims: A single case study of a CBP in an equatorial coronal hole with an exceptionally large size is investigated to expand on our understanding of the formation of mini-filaments, their desta…
Spectropolarimetric follow-up of 8 rapidly rotating, X-ray bright FK Comae candidates
Wade, G. A.; Mason, E.; Sikora, J. +2 more
Our understanding of the evolved, rapidly rotating, magnetically active, and apparently single FK Comae stars is significantly hindered by their extreme rarity: only two stars in addition to FK Com itself are currently considered to be members of this class. Recently, a sample of more than 20 candidate FK Comae type stars was identified within the…
Yonsei Evolutionary Population Synthesis (YEPS) Model. III. Surface Brightness Fluctuation of Normal and Helium-enhanced Simple Stellar Populations
Chung, Chul; Lee, Sang-Yoon; Yoon, Suk-Jin +2 more
We present an evolutionary population synthesis model of the surface brightness fluctuation (SBF) for normal and He-enriched simple stellar populations (SSPs). While our SBF model for the normal He population agrees with other existing models, the He-rich population, containing hotter horizontal branch stars and brighter red clump stars than the n…