Search Publications
Migratory Outbursting Quasi-Hilda Object 282P/(323137) 2003 BM80
Chandler, Colin Orion; Trujillo, Chadwick A.; Oldroyd, William J.
We report that object 282P/(323137) 2003 BM80 is undergoing a sustained activity outburst, lasting over 15 months thus far. These findings stem in part from our NASA Partner Citizen Science project Active Asteroids (http://activeasteroids.net), which we introduce here. We acquired new observations of 282P via our observing campaign (Vat…
High-resolution, High-sensitivity, Low-frequency uGMRT View of Coma Cluster of Galaxies
Brunetti, G.; Venturi, T.; Churazov, E. M. +12 more
We present high-resolution, high-sensitivity upgraded Giant Metrewave Radio Telescope observations of the Coma cluster (A1656) at 250-500 MHz and 550-850 MHz. At 250-500 MHz, 135 sources have extensions >0.'45 (with peak-to-local-noise ratio >4). Of these, 24 sources are associated with Coma-member galaxies. In addition, we supplement this s…
A Study of Sunspot 3 Minute Oscillations Using ALMA and GST
Yurchyshyn, Vasyl; Gary, Dale E.; Reardon, Kevin P. +1 more
Waves and oscillations are important solar phenomena, not only because they can propagate and dissipate energy in the chromosphere, but also because they carry information about the structure of the atmosphere in which they propagate. The nature of the 3 minute oscillations observed in the umbral region of sunspots is considered to be an effect of…
Two New Black Widow Millisecond Pulsars in M28
Cadelano, Mario; Pallanca, Cristina; Ransom, Scott M. +18 more
We report the discovery of two Black Widow millisecond pulsars in the globular cluster (GC) M28 with the MeerKAT telescope. PSR J1824-2452M (M28M) is a 4.78 ms pulsar in a 5.82 hr orbit, and PSR J1824-2452N (M28N) is a 3.35 ms pulsar in a 4.76 hr orbit. Both pulsars have dispersion measures near 119.30 pc cm-3 and have low-mass companio…
GOALS-JWST: Unveiling Dusty Compact Sources in the Merging Galaxy IIZw096
Inami, Hanae; Böker, Torsten; Kemper, Francisca +30 more
We have used the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) to obtain the first spatially resolved, mid-infrared images of IIZw096, a merging luminous infrared galaxy (LIRG) at z = 0.036. Previous observations with the Spitzer Space Telescope suggested that the vast majority of the total IR luminosity (L IR)…
Is There an Enormous Cold Front at the Virial Radius of the Perseus Cluster?
Fabian, A. C.; Sanders, J. S.; Walker, S. A. +3 more
We present new XMM-Newton observations extending the mosaic of the Perseus cluster out to the virial radius to the west. Previous studies with ROSAT have reported a large excess in surface brightness to the west, possibly the result of large-scale gas sloshing. In our new XMM-Newton observations we have found two X-ray surface brightness edges at …
Late-onset Circumstellar Medium Interactions are Rare: An Unbiased GALEX View of Type Ia Supernovae
Shappee, Benjamin J.; Anand, Gagandeep S.; Tucker, Michael A. +2 more
Using ultraviolet (UV) light curves, we constrain the circumstellar environments of 1080 Type Ia supernovae (SNe Ia) within z < 0.5 from archival Galaxy Evolution Explorer (GALEX) observations. All SNe Ia are required to have pre- and post-explosion GALEX observations to ensure adequate subtraction of the host-galaxy flux. Using the late-time G…
Conditions for Direct Black Hole Seed Collapse near a Radio-loud Quasar 1 Gyr after the Big Bang
Overzier, Roderik A.
Observations of luminous quasars and their supermassive black holes at z ≳ 6 suggest that they formed at dense matter peaks in the early universe. However, few studies have found definitive evidence that the quasars lie at cosmic density peaks, in clear contrast with theory predictions. Here we present new evidence that the radio-loud quasar SDSS …
High-frequency Magnetic Fluctuations in Space Plasmas and the Role of Electron Landau Damping
Telloni, Daniele; Vecchio, Antonio; Lepreti, Fabio +1 more
While low-frequency plasma fluctuations in the interplanetary space have been successfully described in the framework of classical turbulence, high-frequency fluctuations still represent a challenge for theoretical models. At these scales, kinetic plasma processes are at work, but although some of them have been identified in spacecraft measuremen…
Multimessenger Constraints on Magnetic Fields in Merging Black Hole-Neutron Star Binaries
Haiman, Zoltán; D'Orazio, Daniel J.; Vigna-Gómez, Alejandro +2 more
The LIGO-Virgo-KAGRA Collaboration recently detected gravitational waves (GWs) from the merger of black hole-neutron star (BHNS) binary systems GW200105 and GW200115. No coincident electromagnetic (EM) counterparts were detected. While the mass ratio and BH spin in both systems were not sufficient to tidally disrupt the NS outside the BH event hor…