Search Publications
Separating the Spectral Counterparts in NGC 1275/Perseus Cluster in X-Rays
Fedorova, Elena; Zadorozhna, Lidiia; Tugay, Anatolii +3 more
We present a model-independent method for separating the spectral counterparts of the active galactic nucleus (AGN) NGC 1275 from the surrounding emission of the Perseus cluster, as observed by Suzaku/XIS cameras. The Perseus cluster emission extends to higher energies than typically observed in AGN environments, reaching up to 9–10 keV. This nece…
Eight New Substellar Hyades Candidates from the UKIRT Hemisphere Survey
Cushing, Michael C.; Schneider, Adam C.; Faherty, Jacqueline K. +16 more
We have used the UKIRT Hemisphere Survey combined with the UKIDSS Galactic Cluster Survey, the UKIDSS Galactic Plane Survey, and the CatWISE2020 catalog to search for new substellar members of the nearest open cluster to the Sun, the Hyades. Eight new substellar Hyades candidate members were identified and observed with the Gemini/GNIRS near-infra…
A Preliminary Comparative Study on the Centering Algorithms for Cassini-ISS NAC Images
Zhang, Q. -F.; Liang, T.; Liu, G. -M. +2 more
Obtaining high precision is an important consideration for astrometric studies using images from the Narrow Angle Camera (NAC) of the Cassini Imaging Science Subsystem (ISS). Selecting the best centering algorithm is key to enhancing astrometric accuracy. In this study, we compared the accuracy of five centering algorithms: Gaussian fitting, the m…
Confirming the Tidal Tails of the Young Open Cluster Blanco 1 with TESS Rotation Periods
Huang, Chelsea X.; Bouma, Luke G.; Vanderburg, Andrew M. +1 more
Blanco 1 is an ≈130 Myr open cluster located 240 pc from the Sun, below the Galactic plane. Recent studies have reported the existence of diffuse tidal tails extending 50–60 pc from the cluster center based on the positions and velocities measured by Gaia. To independently assess the reality and extent of this structure, we used light curves gener…
Hybrid Kinetic Modeling of the Magnetosheath Impulsive Plasma Cloud Penetration Through the Magnetopause and Comparison With MMS and Other Spacecraft Observations
Giles, B. L.; Lipatov, A. S.; Gershman, D. J. +1 more
This research examines the plasma processes under penetration of the plasma clouds (plasmoids) across the magnetopause which is modeled as a tangential discontinuity (TD). Cases with the parallel magnetic field in both sides out of the TD are under investigation. Plasma parameters and magnetic field were chosen from the MMS mission and other space…
Suzaku observation of an iron K-shell line in the spiral galaxy NGC 6946
Yamauchi, Shigeo; Inaba, Azusa; Anraku, Yumiko
An emission line at ~6.7 keV is attributable to an He-like iron K-shell transition, which indicates existence of a thin thermal plasma with a temperature of several keV. Using Suzaku archival data, we searched for the iron K-line from the spiral galaxy NGC 6946, and found it at 6.68 ± 0.07 keV at the 3.1σ level in the central $r\le {2.^{\prime }5}…
Formaldehyde observations of the Perseus Molecular Cloud
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
Large-scale observations of the Perseus Molecular Cloud (MC) with Nanshan 26-m telescope are presented using the 6 cm ortho-H2CO (110-111) transition. As a probe of dense gas at low temperatures, the H2CO absorption extends over the main parts of the Perseus MC. A comparison of the H2CO absorp…
Intermittent plasma turbulence in the Martian plasma environment
Fränz, Markus; Echer, Ezequiel; Franco, Adriane M. S. +1 more
Due to the absence of a global intrinsic magnetic field, Mars presents an induced magnetosphere, which is formed by the interaction between the solar wind and the conductive ionosphere of the planet. In that interaction, plasma boundaries and regions are created. Wave activity is present in the Mars plasma environment, and as consequence of non-li…
Ensemble Learning for Stellar Classification and Radius Estimation from Multimodal Data
Luo, A. -Li; Kong, Xiao; Li, Xiang-Ru +2 more
Stellar classification and radius estimation are crucial for understanding the structure of the Universe and stellar evolution. With the advent of the era of astronomical big data, multimodal data are available and theoretically effective for stellar classification and radius estimation. A problem is how to improve the performance of this task by …
Spectral aging analysis of the 3C 219 double-double radio galaxy
Jamrozy, M.; Wolnik, K.; Jurusik, W.
Context. Double-double radio galaxies are characterized by intermittent jet-formation activity. The exact reasons for this behavior are not yet fully understood. Studying these objects and their environment allows us to find common characteristics and compare them with the general population of radio galaxies. 3C 219 is a well-known and thoroughly…