Search Publications
Simulation of Water Vapor Photodissociation during Dust Storm Season on Mars
Medvedev, A. S.; Rodin, A. V.; Shaposhnikov, D. S.
Within the framework of this work, using a three-dimensional numerical model of the general circulation of the Martian atmosphere MAOAM (Martian Atmosphere: Observation and Modeling), also known as MPI-MGCM (Max Planck Institute Martian General Circulation Model), we simulated the planet's hydrological cycle during the 28 and 34 Martian years (MY2…
Improvements to Pan-STARRS1 Astrometry. II. Corrections for Differential Chromatic Refraction
White, Richard L.; Shiao, Bernie; Lubow, Stephen H.
In a previous paper, we applied the Gaia DR2 catalog to improve the astrometric accuracy of about 1.7 billion objects in Pan-STARRS1 Data Release 2 (PS1 DR2). We report here on further improvements made by utilizing Gaia EDR3 and correcting for the effects of differential chromatic refraction (DCR) in decl. We extend the correction algorithm in Pa…
Detection of a Superluminous Spiral Galaxy in the Heart of a Massive Galaxy Cluster
Lovisari, Lorenzo; Ogle, Patrick; Jones, Christine +5 more
It is well established that brightest cluster galaxies (BCGs), residing in the centers of galaxy clusters, are typically massive and quenched galaxies with cD or elliptical morphology. An optical survey suggested that an exotic galaxy population, superluminous spiral and lenticular galaxies, could be the BCGs of some galaxy clusters. Because the c…
Suzaku observations of Fe K-shell lines in the supernova remnant W 51 C and hard X-ray sources in the proximity
Fujita, Yutaka; Nobukawa, Masayoshi; Nobukawa, Kumiko K. +2 more
In this paper, we investigate the Fe K-shell lines in the supernova remnant W 51 C and hard X-ray sources in the proximity. We measure the intensities of the Fe I Kα and Fe XXV Heα lines at 6.40 and 6.68 keV, respectively, and find that the intensity of the 6.68 keV line is consistent with the background level expected from previous studies, while…
Recent Formation of a Spiral Disk Hosting Progenitor Globular Clusters at the Center of the Perseus Brightest Cluster Galaxy. I. Spiral Disk
Ohyama, Youichi; Lim, Jeremy; Yeung, Michael C. H.
We address the nature and origin of a spiral disk at the center of NGC 1275, the giant elliptical galaxy at the center of the Perseus cluster, that spans a radius of ~5 kpc. By comparing stellar absorption lines measured in long-slit optical spectra with synthetic spectra for single stellar populations, we find that fitting of these lines requires…
An investigation into the spectral parameters of ultra-low-frequency (ULF) waves in the polar caps and magnetotail
Nosikova, Nataliya Sergeevna; Yagova, Nadezda Viktorovna; Baddeley, Lisa Jane +2 more
The present case study is focused on fluctuations at ∼ 1.5 mHz observed on open field lines in both of the polar caps in ground-based geomagnetic data and in the electron concentration in the Northern Hemisphere ionosphere. Coherent pulsations with a relatively narrow narrowband-like spectra and a higher fraction of transversal components in the t…
Estimation of the Mass of the Very Massive Galaxy Cluster SRGe CL2305.2-2248 from Strong Lensing
Bikmaev, I. F.; Gilfanov, M. R.; Khamitov, I. M. +10 more
SRGe CL2305.2-2248 (SPT-CL J2305-2248, ACT-CL J2305.1-2248) is one of the most massive galaxy clusters at high redshifts ($z∼eq 0.76$) and is of great interest for cosmology. Deep images have been obtained at the Russian-Turkish 1.5-m telescope (RTT-150) for an optical identification of this cluster. In combination with the open Hubble Space Teles…
New, late-type spectroscopic binaries with X-ray emission
Guillout, P.; Giarrusso, M.; Leone, F. +6 more
In this paper, we present a spectroscopic study of six double-lined binaries, five of which were recently discovered in a high-resolution spectroscopic survey of optical counterparts of stellar X-ray sources. Thanks to high-resolution spectra acquired with CAOS spectropolarimeter during 7 yr, we were able to measure the radial velocities of their …
Searching for Diamagnetic Blob Accretion in the 74 day K2 Observation of V2400 Ophiuchi
Garnavich, Peter; Littlefield, Colin; Szkody, Paula +3 more
Since its discovery in 1995, V2400 Ophiuchi (V2400 Oph) has stood apart from most known intermediate polar cataclysmic variables due to its proposed magnetic field strength (9-27 MG) and diskless accretion. To date, the exact accretion mechanism of the system is still unknown, and standard accretion models fail to accurately predict the peculiar b…
Constraining Mass of M31 Combing Kinematics of Stars, Planetary Nebulae and Globular clusters
Fan, Zhou; Zhu, Ling; Liu, Cheng +2 more
We construct a multiple-population discrete axisymmetric Jeans model for the Andromeda (M31) galaxy, considering three populations of kinematic tracers: 48 supergiants and 721 planetary nebulae (PNe) in the bulge and disk regions, 554 globular clusters extending to ~30 kpc, and halo stars extending to ~150 kpc of the galaxy. The three populations …