Search Publications
The "C": The large Chameleon-Musca-Coalsack cloud
Alves, João; Zucker, Catherine; Edenhofer, Gordian +2 more
Recent advancements in 3D dust mapping have transformed our understanding of the Milky Way's local interstellar medium, enabling us to explore its structure in three spatial dimensions for the first time. In this Letter, we use the most recent 3D dust map by Edenhofer et al. to study the well-known Chameleon, Musca, and Coalsack cloud complexes, l…
The Morphology of Martian Pyroclastic Ramparts and Their Use in Determining Vent-Proximal Eruption Dynamics
Wilson, L.; Pieterek, B.; Jones, T. J.
High-resolution investigations of Late Amazonian volcanic landforms provide previously unrevealed insights into the dynamics of Martian volcanic eruptions. On Earth, the formation of vent-proximal accumulations of spatter deposits is attributed to low-intensity lava fountaining episodes representing eruptions on the very edge of explosive activity…
Stellar Cycle and Evolution of Polar Spots in an M+WD Binary
Liu, Jifeng; Wang, Song; Zhao, Xinlin +5 more
Stellar activity cycles reveal continuous relaxation and induction of magnetic fields. The activity cycle is typically traced through the observation of cyclic variations in total brightness or Ca H&K emission flux of stars, as well as cyclic variations in the orbital periods of binary systems. In this work, we report the identification of a s…
Lyα Absorption in a "Croissant-like" Heliosphere
Wood, Brian E.; Tenishev, Valeriy; Toth, Gabor +6 more
Lyα absorption profiles have been used to detect astrospheres and heliospheric absorption from the hydrogen wall and heliotail. Using magnetohydrodynamic models of the heliosphere, we can compare simulated to observed Lyα profiles to probe the neutral hydrogen within and near the heliosphere. There is an ongoing controversy whether the heliosphere…
Host galaxy of low-luminosity compact sources
Ciroi, S.; Berton, M.; Sani, E. +6 more
The term 'active galactic nuclei' (AGN) is applied to a huge variety of objects, classified on the basis of their properties at different wavelengths. Peaked sources (PSs) represent a class of AGN at the first stage of evolution, characterised by a peaked radio spectrum. Among these radio sources, low-luminosity compact (LLC) sources can be identi…
Lunar elemental abundances as derived from Chandrayaan-2
Bhatt, M.; Narendranath, S.; Pillai, Netra S. +6 more
The distribution of Mg, Al, Si, Ca and Fe on the lunar surface are important to understand the petrological characteristics of the Moon and its geological evolution. We derived new elemental distribution maps using the Chandrayaan-2 Large Area Soft X-ray Spectrometer (CLASS) experiment onboard the Chandrayaan-2 Orbiter. These are the first set of …
The PSF smoothing effect on concentration-related parameters of high-redshift galaxies in HST and JWST
Ho, Luis C.; Zhuang, Ming-Yang; Li, Zhao-Yu +2 more
Aims: We performed a comprehensive investigation of the PSF smoothing effect on the measurement of concentration-related parameters (C, Gini, and M20) of high-redshift galaxies in the HST and JWST surveys.
Methods: Our sample contains massive galaxies (109.5 M⊙ ≤ M* ≤ 1011.5 M⊙<…
Exploring the properties of the obscured hyperluminous quasar COS-87259 at z = 6.853
Farrah, Duncan; Efstathiou, Andreas; Varnava, Charalambia
In this paper we explore the properties of the
Cluster membership analysis with supervised learning and N-body simulations
Berczik, P.; Pang, X.; Bissekenov, A. +3 more
Context. Membership analysis is an important tool for studying star clusters. There are various approaches to membership determination, including supervised and unsupervised machine-learning (ML) methods. Aims. We perform membership analysis using the supervised ML approach. Methods. We trained and tested our ML models on two sets of star cluster …
Fierce Feedback in an Obscured, Sub-Eddington State of the Seyfert 1.2 Markarian 817
Brandt, W. N.; Zoghbi, Abderahmen; Miller, Jon M. +7 more
Mrk 817 is a bright and variable Seyfert 1.2 active galactic nucleus (AGN). X-ray monitoring of Mrk 817 with the Neil Gehrels Swift Observatory in 2022 revealed that the source flux had declined to a lower level than recorded at any prior point in the then 19 yr mission. We present an analysis of deep XMM-Newton and NuSTAR observations obtained in…