Search Publications
The Formation of Filaments and Dense Cores in the Cocoon Nebula (IC 5146)
Kwon, Woojin; Cho, Jungyeon; Chung, Eun Jung +4 more
We present 850 µm linear polarization and C18O (3 ‑ 2) and 13CO (3 ‑ 2) molecular line observations toward the filaments (F13 and F13S) in the Cocoon Nebula (IC 5146) using the JCMT POL-2 and Heterodyne Array Receiver Program instruments. F13 and F13S are found to be thermally supercritical with identified dense cores a…
An Outbursting Protostar: The Environment of L1251 VLA 6
Ábrahám, Péter; Kóspál, Ágnes; Kun, Mária +6 more
Young protostars that undergo episodic accretion can provide insight into the impact on their circumstellar environments while matter is accreted from the disk onto the protostar. IRAS 22343+7501 is a four-component protostar system with one of those being a fading outbursting protostar, which was obseved with the Karl G. Jansky Very Large Array (…
2019 UO14: A Transient Trojan of Saturn
Tholen, David J.; Weryk, Robert; Hui, Man-To +5 more
Saturn has long been the only giant planet in our solar system without any known Trojan members. In this Letter, with serendipitous archival observations and refined orbit determination, we report that 2019 UO14 is a Trojan of the gas giant. However, the object is only a transient Trojan currently librating around the leading Lagrange p…
Astrometric Jitter as a Detection Diagnostic for Recoiling and Slingshot Supermassive Black Hole Candidates
Natarajan, Priyamvada; Gezari, Suvi; Ward, Charlotte +4 more
Supermassive black holes (SMBHs) can be ejected from their galactic centers due to gravitational wave recoil or the slingshot mechanism following a galaxy merger. If an ejected SMBH retains its inner accretion disk, it may be visible as an off-nuclear active galactic nucleus (AGN). At present, only a handful of offset AGNs that are recoil or sling…
A Multiwavelength Study of the Symbiotic Mira HM Sge with SOFIA and HST
Goldman, Steven R.; Montiel, Edward; Sankrit, Ravi +3 more
We have targeted the dusty symbiotic Mira system HM Sge with four instruments from the IR to the UV. We have used these observations along with archival observations to study how the system has been evolving after its 1975 nova-like outburst. We have detected rovibrational water emission in a symbiotic system for the first time using new EXES high…
Spectro-temporal Evolution of 4U 1702-429 Using AstroSat-NICER
Misra, Ranjeev; Chattopadhyay, Suchismito; Mandal, Soma +2 more
We present the broadband spectral and timing properties of the atoll source 4U 1702-429 using two observations of AstroSat with the second one having simultaneous NICER data. For both observations, the spectra can be represented by a Comptonizing medium with a blackbody seed photon source that can be identified with the surface of the neutron star…
Very Long Baseline Array Observations of Parsec-scale Radio Emission in Dual Active Galactic Nuclei
Ho, Luis C.; Zhang, Ming; An, Tao +11 more
It is believed that dual active galactic nuclei (AGN) form during galaxy mergers. Studying dual-AGN emission can provide valuable insights into galaxy merging and evolution. To investigate parsec-scale radio emission properties, we observed eight radio components of four selected dual-AGN systems using the Very Long Baseline Array (VLBA) at 5 GHz …
Study of Plasma Heating Processes in a Coronal Mass Ejection–driven Shock Sheath Region Observed with the Metis Coronagraph
Susino, Roberto; Fineschi, Silvano; Stangalini, Marco +25 more
On 2021 September 28, a C1.6 class flare occurred in active region NOAA 12871, located approximately at 27°S and 51°W on the solar disk with respect to Earth's point of view. This event was followed by a partial halo coronal mass ejection (CME) that caused the deflection of preexisting coronal streamer structures, as observed in visible-light coro…
How Solar Soft X-Ray Irradiance Is Affected by the Size of Field of View
Takeda, Aki; Boland, Shannon
Soft X-ray images of the Sun obtained with multiple broadband filters provide a simple and useful method to calculate averaged coronal temperature and emission measure, from which we can further calculate solar X-ray irradiance in physical units, e.g., watts per square meter. However, X-ray telescopes are often designed for pursuing high spatial r…
The Sun's Magnetic Power Spectra over Two Solar Cycles. II. Cycle Dependence of Active Regions, a Magnetic Network, and Their Relation
Wang, Ruihui; Jiang, Jie; Luo, Yukun
The multiscaled solar magnetic field consists of two major components: active regions (ARs) and magnetic network. Unraveling the cycle-dependent properties and interrelations of these components is crucial for understanding the evolution of the solar magnetic field. In this study, we investigate these components using magnetic power spectra derive…