Search Publications
A Centiparsec-scale Compact Radio Core in the Nearby Galaxy M60
Yang, Jun; Liao, Mai; Dou, Liming +7 more
M60, an elliptical galaxy located 16.5 Mpc away, has an active nucleus with a very low luminosity and an extremely low accretion rate. Its central supermassive black hole (SMBH) has a mass of M BH ~ 4.5 × 109 M ⊙ and a Schwarzschild radius corresponding to R S ~ 5.4 µas. To investigate the nature o…
First Determination in the Extended Corona of the 2D Thermal Evolution of a Current Sheet after a Solar Eruption
Susino, Roberto; Fineschi, Silvano; Stangalini, Marco +26 more
For the first time the evolution of the coronal reconfiguration after a coronal mass ejection (CME) was observed by the multichannel Metis Coronagraph on board the ESA–Solar Orbiter mission. The images acquired in visible light (VL) between 3.0 and 5.4 R ⊙ show the formation after a CME of a bright elongated radial feature interpreted a…
AGN STORM 2. VIII. Investigating the Narrow Absorption Lines in Mrk 817 Using HST-COS Observations
Kaspi, Shai; Filippenko, Alexei V.; Barth, Aaron J. +39 more
We observed the Seyfert 1 galaxy Mrk 817 during an intensive multiwavelength reverberation mapping campaign for 16 months. Here, we examine the behavior of narrow UV absorption lines seen in the Hubble Space Telescope/Cosmic Origins Spectrograph spectra, both during the campaign and in other epochs extending over 14 yr. We conclude that, while the…
The VIRUS-dE Survey. I. Stars in Dwarf Elliptical Galaxies—3D Dynamics and Radially Resolved Stellar Initial Mass Functions
Bender, Ralf; Thomas, Jens; Hill, Gary J. +9 more
We analyze the stellar structure of a sample of dwarf ellipticals (dEs) inhabiting various environments within the Virgo cluster. Integral-field observations with a high spectral resolution allow us to robustly determine their low-velocity dispersions (∼25 km s‑1) and higher-order kinematic moments out to the half-light radius. We find …
Local Proton Heating at Magnetic Discontinuities in Alfvénic and Non-Alfvénic Solar Wind
Bandyopadhyay, R.; Tenerani, A.; Verniero, J. L. +1 more
We investigate the local proton energization at magnetic discontinuities/intermittent structures and the corresponding kinetic signatures in velocity phase space in Alfvénic (high cross helicity) and non-Alfvénic (low cross helicity) wind streams observed by Parker Solar Probe. By means of the partial variance of increments method, we find that th…
JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster
Luhman, K. L.; Tremblin, P.; Parker, R. J. +4 more
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1–5 µm spectra of 22 brown dwarf candidates in the Orion Nebula Cluster, which were selected with archival images from the Hubble Space Telescope. One of the targets was previously classified a…
Constraining the Excitation of Molecular Gas in Two Quasar-starburst Systems at z ∼ 6
Fan, Xiaohui; Neri, Roberto; Menten, Karl M. +15 more
We present NOrthern Extended Millimeter Array observations of CO(8–7), (9–8), and (10–9) lines, as well as the underlying continuum for two far-infrared luminous quasars: SDSS J2054-0005 at z = 6.0389 and SDSS J0129-0035 at z = 5.7788. Both quasars were previously detected in CO (2–1) and (6–5) transitions, making them candidates for studying the …
IS⊙IS Solar γ-Ray Measurements: Initial Observations and Calibrations
Mitchell, D. G.; McComas, D. J.; Mitchell, J. G. +13 more
High-energy neutral solar radiation in the form of γ-rays and neutrons is produced as secondary products in solar flares. The characteristics of this emission can provide key information regarding the energization of charged particles, particularly when primary particles remain trapped in the corona. The Integrated Science Investigation of the Sun…
MIRI MRS Observations of Beta Pictoris. II. The Spectroscopic Case for a Recent Giant Collision
Law, David R.; Chen, Christine H.; Hines, Dean C. +17 more
Modeling observations of the archetypal debris disk around β Pic, obtained in 2023 January with the MIRI Medium Resolution Spectrograph on board JWST, reveals significant differences compared with that obtained with the Infrared Spectrograph on board Spitzer. The bright 5–15 µm continuum excess modeled using a ∼600 K black body has disappear…
Disk Turbulence and Star Formation Regulation in High-z Main-sequence Analog Galaxies
Glazebrook, Karl; Lenkić, Laura; Bolatto, Alberto D. +7 more
The gas-phase velocity dispersions in disk galaxies, which trace turbulence in the interstellar medium, are observed to increase with lookback time. However, the mechanisms that set this rise in turbulence are observationally poorly constrained. To address this, we combine kiloparsec-scale Atacama Large Millimeter/submillimeter Array observations …