Search Publications
3D physico-chemical model of a pre-stellar core. I. Environmental and structural impact on the distribution of CH3OH and c-C3H2
Caselli, P.; Jensen, S. S.; Spezzano, S. +2 more
Context. Pre-stellar cores represent the earliest stage of the formation process of stars and planets. By characterizing the physical and chemical structure of these cores, we can establish the initial conditions for star and planet formation and determine to what degree the chemical composition of pre-stellar cores is inherited by the later stage…
Hubble Space Telescope and Hyper-Suprime-Cam Weak-lensing Study of the Equal-mass Dissociative Merger CIZA J0107.7+5408
Clarke, Tracy E.; Giacintucci, Simona; Jee, M. James +6 more
A dissociative merger is formed by the interplay of ram pressure and gravitational forces, which can lead to a spatial displacement of the dark matter and baryonic components of the recently collided subclusters. CIZA J0107.7+5408 is a nearby (z = 0.105) dissociative merger that hosts two X-ray brightness peaks and a bimodal galaxy distribution. A…
The SOUL view of IRAS 20126+4104. Kinematics and variability of the H2 jet from a massive protostar
Sanna, A.; Leurini, S.; Esposito, S. +20 more
Context. We exploit the increased sensitivity of the recently installed adaptive optics SOUL at the LBT to obtain new high-spatial-resolution near-infrared images of the massive young stellar object IRAS20126+4104 and its outflow.
Aims: We aim to derive the jet proper motions and kinematics, as well as to study its photometric variability by …
Estimates of Proton and Electron Heating Rates Extended to the Near-Sun Environment
McComas, D. J.; Bale, S. D.; Cranmer, S. R. +11 more
A central problem of space plasma physics is how protons and electrons are heated in a turbulent, magnetized plasma. The differential heating of charged species due to dissipation of turbulent fluctuations plays a key role in solar wind evolution. Measurements from previous heliophysics missions have provided estimates of proton and electron heati…
Imaging-spectroscopy of a band-split type II solar radio burst with the Murchison Widefield Array
Gallagher, Peter T.; Carley, Eoin P.; Oberoi, Divya +1 more
Type II solar radio bursts are caused by magnetohydrodynamic (MHD) shocks driven by solar eruptive events such as coronal mass ejections (CMEs). Often, both fundamental and harmonic bands of type II bursts are split into sub-bands, which are generally believed to be coming from upstream and downstream regions of the shock; however, this explanatio…
The Local Group's mass: probably no more than the sum of its parts
Johansson, Peter H.; Sawala, Till; Teeriaho, Meri
The total mass of the Local Group and the masses of its primary constituents, the Milky Way (MW) and M31, are important anchors for several cosmological questions. Recent independent measurements have consistently yielded halo masses close to 1012M⊙ for the MW, and 1-2 × 1012M⊙ for M31, while estimates d…
Spatial and dynamical structure of the NGC 2264 star-forming region
Micela, G.; Bonito, R.; Peres, G. +7 more
Context. The formation of stars within molecular clouds and the early stages of stellar evolution (e.g., mass accretion and disk dispersal) are all active research topics. The target of this study, NGC 2264, is a benchmark star-forming region in which these issues can be profitably studied.
Aims: We revisit the structure, dynamics, and star-f…
Demographics of Protoplanetary Disks: A Simulated Population of Edge-on Systems
Perrin, Marshall D.; Ménard, François; Angelo, Isabel +9 more
The structure of protoplanetary disks plays an essential role in planet formation. A disk that is highly inclined, or "edge-on," is of particular interest since its geometry provides a unique opportunity to study the disk's vertical structure and radial extent. Candidate edge-on protoplanetary disks are typically identified via their unique spectr…
ATOMS: ALMA three-millimeter observations of massive star-forming regions - XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ( 1500 M⨀) clump
Tej, Anandmayee; Lee, Chang Won; Liu, Tie +16 more
Whether ionization feedback triggers the formation of massive stars is highly debated. Using ALMA 3-mm observations with a spatial resolution of ~0.05 pc and a mass sensitivity of 1.1 $\rm M_\odot$ per beam at 20 K, we investigate the star formation and gas flow structures within the ionizing feedback-driven structure, a clump-scale massive (≳ 150…
7Be detection in the 2021 outburst of RS Oph
Della Valle, M.; Bonifacio, P.; Hernanz, M. +7 more
The recurrent nova RS Oph underwent a new outburst on 2021 August 8, reaching a visible brightness of V = 4.8 mag. Observations of the 2021 outburst made with the high-resolution UVES spectrograph at the Kueyen-UT2 telescope at ESO-VLT in Paranal enabled detection of the possible presence of 7Be newly made in the thermonuclear runaway r…