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The Solar Wind Parker Spiral Angle Distributions and Variations at 1 au
Xu, Qi; Xu, Xiaojun; Wang, Jing +8 more
Using the data from the Advanced Composition Explorer (ACE) and Wind spacecraft, we statistically studied the Parker spiral angle (PSA) of the solar wind magnetic field from 1998 to 2019 at 1 au. The PSA occurrences over both a Carrington rotation (CR) and a year can be well fitted by a Gaussian distribution. However, large-scale magnetic structur…
Massive Multi-Mission Statistical Study and Analytical Modeling of the Earth's Magnetopause: 4. On the Near-Cusp Magnetopause Indentation
Lavraud, B.; Jeandet, A.; Aunai, N. +3 more
The shape and location of the magnetopause current sheet in the near-cusp region is still a debated question. Over time, several observations led to contradictory conclusions regarding the presence of an indentation of the magnetopause in that region. As a result several empirical models consider the surface is indented in that region, while some …
Searching Extra-tidal Features around the Globular Cluster Whiting 1
Tian, Haijun; Tian, Hao; Carballo-Bello, Julio A. +14 more
Whiting 1 is a faint and young globular cluster in the halo of the Milky Way, and was suggested to have originated in the Sagittarius spherical dwarf galaxy (Sgr dSph). In this paper, we use the deep DESI Legacy Imaging Surveys to explore tentative spatial connection between Whiting 1 and the Sgr dSph. We redetermine the fundamental parameters of …
The Astrometric Animation of Water Masers toward the Mira Variable BX Cam
Kim, Dong-Jin; Sun, Yan; Orosz, Gabor +20 more
We report very long baseline interferometry (VLBI) monitoring observations of the 22 GHz water (H2O) masers around the Mira variable BX Cam, which were carried out as a part of the EAVN Synthesis of Stellar Maser Animations project. Data of 37 epochs in total were obtained from 2018 May to 2021 June with a time interval of 3-4 weeks, sp…
Catalogue of stars measured in the Geneva seven-colour photometric system
Paunzen, E.
Context. The Geneva seven-colour photometric system is successfully applied to the study of various astrophysical objects. It measures the slope of the Paschen continuum, the Balmer discontinuity, and blocking absorption due to hydrogen or metallic lines. One of its greatest strengths is its intrinsic homogeneity.
Aims: A new catalogue of the…
Dust emissivity in resolved spiral galaxies
Clark, Christopher J. R.; De Looze, Ilse; Baes, Maarten +12 more
Context. The far-infrared (FIR) and sub-millimeter (submm) emissivity, ϵν, of the Milky Way (MW) cirrus is an important benchmark for dust grain models. Dust masses in other galaxies are generally derived from the FIR/submm using the emission properties of these MW-calibrated models.
Aims: We seek to derive the FIR/submm ϵν
L-GALAXIES 2020: the formation and chemical evolution of stellar haloes in Milky Way analogues and galaxy clusters
Yates, Robert M.; Mohamed, Shazrene S.; Murphy, Geoff G.
We present an analysis of the formation and chemical evolution of stellar haloes around (a) Milky Way analogue (MWA) galaxies and (b) galaxy clusters in the L-GALAXIES 2020 semi-analytic model of galaxy evolution. Observed stellar halo properties are better reproduced when assuming a gradual stripping model for the removal of cold gas and stars fr…
The binary system of the spinning-top Be star Achernar
Klement, Robert; Rivinius, Thomas; Mérand, Antoine +16 more
Context. Achernar, the closest and brightest classical Be star, presents rotational flattening, gravity darkening, occasional emission lines due to a gaseous disk, and an extended polar wind. It is also a member of a close binary system with an early A-type dwarf companion.
Aims: We aim to determine the orbital parameters of the Achernar syst…
An estimate of the mass of the Milky Way from the Magellanic Stream
Baum, Stefi; Chakrabarti, Sukanya; Craig, Peter A. +1 more
We present a model for the formation of the Magellanic Stream (MS) due to ram pressure stripping. We model the history of the Small and Large Magellanic Clouds in the recent cosmological past in a static Milky Way (MW) potential with diffuse halo gas, using observationally motivated orbits for the Magellanic Clouds derived from HST proper motions …
Dust scattering halo around the CCO in HESS J1731-347: A detailed analysis
Pühlhofer, G.; Doroshenko, V.; Landstorfer, A.
The supernova remnant (SNR) HESS J1731−347 is one of the few objects exhibiting emission up to the TeV energy band and it stands as a prime target for the study of cosmic ray acceleration in SNRs. It also hosts a central compact object (CCO), which is of interest in the context of the ultra-dense matter equation of state in neutron stars. For both…