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Broadband X-ray observations of four gamma-ray narrow-line Seyfert 1 galaxies
Piconcelli, E.; Foschini, L.; Pogge, R. W. +4 more
Narrow-line Seyfert 1 galaxies (NLS1s) is one of the few classes of active galactic nuclei harboring powerful relativistic jets and detected in γ-rays. NLS1s are well-known X-ray sources. While in non-jetted sources the origin of this X-ray emission may be a hot corona surrounding the accretion disk, in jetted objects, especially beamed ones, the …
Annual parallax measurements of a semi-regular variable star SV Pegasus with VERA
Honma, Mareki; Nakagawa, Akiharu; Nagayama, Takahiro +6 more
Many studies have shown that there are clear sequences in the period-luminosity relationship (PLR) for Mira variables and semi-regular variables (SRVs) in the Large Magellanic Cloud (LMC). To investigate the PLR for SRVs in our galaxy, we examined the annual parallax measurement and conducted K'-band photometric monitoring of an SRV star SV Pegasu…
Galactic resonance rings: modelling of motions in the wide solar neighbourhood
Melnik, A. M.
Models of the Galaxy with analytical Ferrers bars can reproduce the residual velocities of OB associations in the Sagittarius, Perseus and Local System star-gas complexes located within 3 kpc of the solar neighbourhood. Ferrers ellipsoids with a density distribution defined by power indices n = 1 and 2 are considered. The successful reproduction o…
RR Lyrae Stars in the Field of Sagittarius II
Rey, Soo-Chang; Jerjen, Helmut; Cha, Sang-Mok +10 more
We present the detection of RR Lyrae variable stars in the field of the Sagittarius II (Sgr II) ultra-faint dwarf (UFD) galaxy. Using B, V time-series photometry obtained with the Korea Microlensing Telescope Network (KMTNet) 1.6 m telescope at CTIO and G-band data from Gaia Data Release 2 (DR2), we identified and characterized two ab-type and fou…
Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have studied a sample containing 6000 OB stars with proper motions and trigonometric parallaxes from the Gaia DR2 catalogue. The following parameters of the angular velocity of Galactic rotation have been found: Ω0 = 29.70 ± 0.11 km s-1 kpc-1, Ω'0 = -4.035 ± 0.031 km s-1 kpc-2, a…
Iron abundance distribution in the hot gas of merging galaxy clusters
Urdampilleta, I.; Simionescu, A.; Kaastra, J. S. +4 more
We present XMM-Newton/EPIC observations of six merging galaxy clusters and study the distributions of their temperature, iron (Fe) abundance and pseudo-entropy along the merging axis. For the first time, we focused simultaneously, and in a comprehensive way, on the chemical and thermodynamic properties of the newly collided intra cluster medium (I…
Creating HiRISE digital elevation models for Mars using the open-source Ames Stereo Pipeline
Hepburn, Adam J.; Holt, Tom; Hubbard, Bryn +1 more
The present availability of sub-decametre digital elevation models on Mars - crucial for the study of surface processes - is scarce. In contrast to low-resolution global datasets, such models enable the study of landforms <10 km in size, which is the primary scale at which geomorphic processes have been active on Mars over the last 10-20 Myr . …
The abundance of massive compact galaxies at 1.0 < z < 3.0 in 3D-HST/CANDELS
Yuan, Qi-Rong; Lu, Shi-Ying; Gu, Yi-Zhou +1 more
Based on a large sample of massive (M * ⩾ 1010 M ⊙) compact galaxies at 1.0 < z < 3.0 in five 3D-HST/CANDELS fields, we quantify the fractional abundance and comoving number density of massive compact galaxies as a function of redshift. The samples of compact quiescent galaxies (cQGs) and compact star-forming…
X-Ray and Radio Variabilities of PSR J2032+4127 near Periastron
Kerr, M.; Wood, K. S.; Gotthelf, E. V. +6 more
We present X-ray and radio monitoring observations of the gamma-ray binary PSR J2032+4127/MT91 213 during its periastron passage in late 2017. Dedicated Chandra, XMM-Newton, NuSTAR X-ray observations, and Very Large Array radio observations of this long orbit (50 yr), 143 ms pulsar/Be star system clearly revealed flux and spectral variability duri…
WASP-190b: Tomographic Discovery of a Transiting Hot Jupiter
Bouchy, F.; Queloz, D.; Ségransan, D. +22 more
We report the discovery of WASP-190b, an exoplanet on a 5.37 day orbit around a mildly evolved F6 IV-V star with V = 11.7, {T}eff} = 6400 ± 100 K, M * = 1.35 ± 0.05 M ⊙, and R * = 1.6 ± 0.1 R ⊙. The planet has a radius of R P = 1.15 ± 0.09 R Jup and a mass of M P