Search Publications
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…
SWEET-Cat: A view on the planetary mass-radius relation
Adibekyan, V.; Hoyer, S.; Sousa, S. G. +9 more
Aims. SWEET-Cat (Stars With ExoplanETs Catalog) was originally introduced in 2013, and since then, the number of confirmed exoplanets has increased significantly. A crucial step for a comprehensive understanding of these new worlds is the precise and homogeneous characterization of their host stars. Methods. We used a large number of high-resoluti…
Icarus Revisited: An Ancient, Metal-poor Accreted Stellar Stream in the Disk of the Milky Way
Vitali, Sara; Cignoni, Michele; Lattanzi, Mario G. +2 more
The search for accreted satellites in the Galactic disk is a challenging task, to which Gaia plays a crucial role in synergy with ground-based spectroscopic surveys. In 2021, P. Re Fiorentin et al. discovered five substructures with disk kinematics including Icarus. To gain more insight into the origin of Icarus as a remnant of a dwarf galaxy rath…
The restless population of bright X-ray sources of NGC 3621
Salvaterra, R.; Tiengo, A.; Marelli, M. +9 more
We report on the multi-year evolution of the population of X-ray sources in the nuclear region of NGC 3621 based on Chandra, XMM-Newton, and Swift observations. Among these, two sources, X1 and X5, after their first detection in 2008, seem to have faded below the detectability threshold, a most interesting fact as X1 is associated with the active …