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Unraveling the birthplaces of NGC 2070's massive stars, tracked with MUSE and revealed with JWST
Castro, N.
The formation of massive O-type stars cannot be simply explained as a scaled-up version of the accretion mechanisms observed in lower-mass stars. Understanding these processes necessitates systematic studies of their early stages, which are challenging to identify. Forming massive stars remain embedded in their dense nursery clouds, and IR instrum…
Importance of the dusk-dawn interplanetary magnetic field component (IMF By) to magnetospheric convection in Earth's magnetotail plasma sheet
Chong, Ghai Siung; Pitkänen, Timo; Kullen, Anita
The solar wind and its embedded magnetic field, the interplanetary magnetic field (IMF) together with magnetic reconnection power the large-scale plasma and magnetic flux circulation in the Earth's magnetosphere-ionosphere system. This circulation is termed as convection and its strength is controlled by the north-south IMF component (IMF Bz). In …
The Sun's Large-Scale Flows I: Measurements of Differential Rotation & Torsional Oscillation
Basu, Sarbani; Pevtsov, Alexei A.; DeRosa, Marc L. +13 more
We have developed a comprehensive catalog of the variable differential rotation measured near the solar photosphere. This catalog includes measurements of these flows obtained using several techniques: direct Doppler, granule tracking, magnetic pattern tracking, global helioseismology, as well as both time-distance and ring-diagram methods of loca…
An Intermediate-mass Black Hole Hidden behind Thick Obscuration
Ricci, Claudio; Stern, Daniel; Pfeifle, Ryan W. +12 more
Recent models suggest approximately half of all accreting supermassive black holes (SMBHs; M BH ≳ 105 M ⊙) are expected to undergo intense growth phases behind Compton-thick (N H > 1.5 × 1024 cm‑2) veils of obscuring gas. However, despite being a viable source for the seeding of …
Hubble Asteroid Hunter. III. Physical properties of newly found asteroids
Popescu, Marcel; Carry, Benoit; Evans, Robin W. +5 more
Context. Determining the size distribution of asteroids is key to understanding the collisional history and evolution of the inner Solar System.
Aims: We aim to improve our knowledge of the size distribution of small asteroids in the main belt by determining the parallaxes of newly detected asteroids in the Hubble Space Telescope (HST) archiv…
The density of the Milky Way's corona at z ≈ 1.6 through ram pressure stripping of the Draco dSph galaxy
Marinacci, Federico; Brown, Anthony G. A.; Helmi, Amina +4 more
Satellite galaxies within the Milky Way's (MW's) virial radius Rvir are typically devoid of cold gas due to ram pressure stripping by the MW's corona. The density of this corona is poorly constrained today and essentially unconstrained in the past, but can be estimated using ram pressure stripping. In this paper, we probe the MW's coron…
Validation of EUHFORIA cone and spheromak coronal mass ejection models
Mierla, M.; Rodriguez, L.; Poedts, S. +15 more
Aims. We present validation results for calculations of arrival times and geomagnetic impact of coronal mass ejections (CMEs) using the cone and spheromak CME models implemented in EUropean Heliospheric FORecasting Information Asset (EUHFORIA). Validating numerical models is crucial for ensuring their accuracy and performance with respect to real …
A Hot Mess: The Rich and Complex Soft Emitting Regions Surrounding the Reflection Dominated Flaring Central Engine of Mrk 1239
Komossa, S.; Gallo, L. C.; Grupe, D. +5 more
Previous X-ray works on Mrk 1239 have revealed a complex narrow-line Seyfert 1 that exhibits substantial absorption and strong emission from both collisionally ionized and photoionized plasmas. Here, we report on deep-pointed observations with XMM-Newton and NuSTAR, along with Swift monitoring, to understand the 0.3–30 keV continuum emission and t…
A Detailed Analysis of a Magnetic Island Observed by WISPR on Parker Solar Probe
Liewer, Paulett C.; Gallagher, Brendan M.; Linton, Mark G. +4 more
We present the identification and physical analysis of a possible magnetic island feature seen in white-light images observed by the Wide-field Imager for Solar Probe (WISPR) on board the Parker Solar Probe. The island is imaged by WISPR during Parker's second solar encounter on 2019 April 6, when Parker was ∼38 R ⊙ from the Sun's cente…
Imaging of the Vega Debris System Using JWST/MIRI
Rieke, George H.; Gáspár, András; Beichman, Charles +6 more
We present images of the Vega planetary debris disk obtained at 15.5, 23, and 25.5 µm with the Mid-Infrared Instrument on JWST. The debris system is remarkably symmetric, smooth, and centered accurately on the star. There is a broad Kuiper-belt-analog ring at ∼80–170 au that coincides with the planetesimal belt detected with the Atacama Larg…