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Properties of a fading AGN from SDSS-IV MaNGA
Bizyaev, Dmitry; Gu, Qiu-Sheng; Shi, Yong +7 more
We identify a fading AGN SDSS J220141.64+115124.3 from the internal Product Launch-11 (MPL-11) in Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. The central region with a projected radius of $\sim$2.4 kpc is characterized as LINER-like line ratios while the outskirts extended to $\sim$15 kpc show Seyfert-like line ratios. The …
Pulling Back the Curtain on Shocks and Star Formation in NGC 1266 with Gemini-NIFS
Heckman, Timothy; Aalto, Susanne; Ogle, Patrick +21 more
We present Gemini near-infrared integral field spectrograph K-band observations of the central 400 pc of NGC 1266, a nearby (D ≈ 30 Mpc) post-starburst galaxy with a powerful multiphase outflow and a shocked interstellar medium. We detect seven H2 rovibrational emission lines excited thermally to T ∼ 2000 K, and weak Brγ emission, consi…
High-resolution spectroscopy of the variable hot post-AGB star LS 4331 (IRAS 17381‑1616)
Hubrig, Swetlana; Parthasarathy, Mudumba; Sarkar, Geetanjali +2 more
An analysis of the high-resolution (
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…