Search Publications
Searching for further evidence for cloud-cloud collisions in L1188
Menten, K. M.; Lee, M. -Y.; Wang, Y. +9 more
In order to search for further observational evidence of cloud-cloud collisions in one of the promising candidates, L1188, we carried out observations of multiple molecular lines toward the intersection region of the two nearly orthogonal filamentary molecular clouds in L1188. Based on these observations, we find two parallel filamentary structure…
Validation of the HITRAN 2016 and GEISA 2015 line lists using ACE-FTS solar occultation observations
Montmessin, F.; Korablev, O.; Fedorova, A. A. +4 more
The ExoMars Trace Gas Orbiter (TGO) began its nominal science phase at Mars in April 2018, following releases of editions to two major spectroscopic line lists: GEISA 2015 (Gestion et Etude des Informations Spectroscopiques Atmosphériques: Management and Study of Atmospheric Spectroscopic Information), and HITRAN 2016 (High Resolution Transmission…
Association of Calcium Network Bright Points with Underneath Photospheric Magnetic Patches
Pant, Vaibhav; Banerjee, Dipankar; Narang, Nancy +1 more
Recent dedicated Hinode polar region campaigns revealed the presence of concentrated kilogauss patches of the magnetic field in the polar regions of the Sun, which are also shown to be correlated with facular bright points at the photospheric level. In this work, we demonstrate that this spatial intermittency of the magnetic field persists even up…
The evolution of gently sloping mantled deposits on Comet 67P/Churyumov-Gerasimenko
Kossacki, Konrad J.; Jasiak, Aleksander
We investigated the role of local illumination and material parameters that can be important in determining evolution of a gently inclined slopes on the nucleus of comet. The considered material parameters are: size of ice grains, agglomerates and pores in-between, thermal conductivity of dust mantle, size of pores in the dust mantle, presence of …
Tidal disruption events: Past, present, and future
Motch, C.; Komossa, S.; Lira, P. +6 more
The tidal disruption of a star by a nuclear supermassive black hole was predicted in the 1970s and first confirmed by soft X‑ray flares seen from quiescent galaxies in the ROSAT all‑sky survey. We report here on the discovery of a new candidate tidal disruption event, 1RXS J075908.8 + 074835, from the ROSAT bright source catalog, which faded by a …
A Study of the Merger History of the Galaxy Group HCG 62 Based on X-Ray Observations and Smoothed Particle Hydrodynamic Simulations
Hu, Dan; Xu, Haiguang; Zhu, Zhenghao +9 more
We chose the bright compact group HCG 62, which has been found to exhibit both excess X-ray emission and high Fe abundance to the southwest of its core, as an example to study the impact of mergers on chemical enrichment in the intragroup medium. We first reanalyze the high-quality Chandra and XMM-Newton archive data to search for evidence of addi…
Inertia parameter statistics of an uncertain small body shape
Bercovici, Benjamin; McMahon, Jay W.
This paper proposes an analytical formulation of the inertia parameters of Bezier shapes of arbitrary order. Bezier shapes can represent classical polyhedra as well as higher-order surface elements within the same framework. This formulation is linearized so as to yield the expressions of the first variation in the inertia properties of interest. …
Quasars Have Fewer Close Companions than Normal Galaxies
Fan, Xiaohui; McGreer, Ian D.; Huang, Yun-Hsin +2 more
We investigate the distribution of companion galaxies around quasars using Hubble Space Telescope (HST) Advanced Camera for Surveys Wide Field Camera (ACS/WFC) archival images. Our master sample contains 532 quasars that have been observed by HST ACS/WFC, spanning a wide range of luminosity (-31 < M i (z = 2) < -23) and redshift …
The influence of dark matter halo on the stellar stream asymmetry via dynamical friction
Kipper, Rain; Tenjes, Peeter; Tuvikene, Taavi +2 more
We study the effect of dynamical friction on globular clusters (GCs) and on the stars evaporated from the GCs (stellar streams) moving in the Galactic halo. Due to dynamical friction, the position of a GC as a stream progenitor starts to shift with respect to its original position in the reference frame of initial GC orbit. Therefore the stars tha…
Spectrophotometric Redshifts for z ∼ 1 Galaxies and Predictions for Number Densities with WFIRST and Euclid
Hathi, Nimish P.; Cohen, Seth; Windhorst, Rogier A. +3 more
We investigate the accuracy of 4000 Å/Balmer-break based redshifts by combining Hubble Space Telescope (HST) grism data with photometry. The grism spectra are from the Probing Evolution And Reionization Spectroscopically survey with HST using the G800L grism on the Advanced Camera for Surveys. The photometric data come from a compilation by the 3D…