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Probing Gas Kinematics and PDR Structure around O-type Stars in the Sh 2-305 H II Region
Dewangan, L. K.; Ojha, D. K.; Sharma, Saurabh +3 more
We report an observational study of the Galactic H II region Sh 2-305/S305 using the [C II] 158 µm line data, which are used to examine the gas dynamics and structure of photodissociation regions. The integrated [C II] emission map at [39.4, 49.5] km s-1 spatially traces two shell-like structures (i.e., inner and outer neutral she…
Does ADS 9346 have a low-mass companion?
Kiyaeva, Olga V.; Khovritchev, Maxim Yu.; Kulikova, Agrippina M. +3 more
Based on the photographic and CCD observations of the relative motion of the A and B components of the binary system ADS 9346 obtained with the 26-inch refractor of Pulkovo Observatory during 1979-2019, we discover an invisible companion associated with star A. Comparison of the ephemerides with the positional and spectroscopic observations allowe…
Convex X-ray spectra of PKS 2155-304 and constraints on the minimum electron energy
Ravikumar, C. D.; Jagan, Sitha K.; Sahayanathan, S. +1 more
The convex (concave upward) high-energy X-ray spectra of the blazar PKS 2155-304, observed by XMM-Newton, is interpreted as the signature of subdominant inverse-Compton emission. The spectra can be well fitted by a superposition of two power-law contributions which imitate the emission due to synchrotron and inverse-Compton processes. The methodol…
High-cadence measurements of electron pitch-angle distributions from Solar Orbiter SWA-EAS burst mode operations
Lewis, G. R.; Kataria, D. O.; Livi, S. +17 more
Small-scale kinetic processes associated with turbulence, plasma instabilities, magnetic reconnection, etc., play a major role in dissipating energy and governing the large-scale evolution of the solar wind. However, a general impediment to improving the understanding of the kinetic physics of the solar wind is in the limitations on measurement ca…
Internal Structure of Molecular Gas in a Main-sequence Galaxy With a UV Clump at z = 1.45
Hatsukade, Bunyo; Ohta, Kouji; Yabe, Kiyoto +2 more
We present results of subarcsec Atacama Large Millimeter/submillimeter Array observations of CO(2-1) and CO(5-4) toward a massive main-sequence galaxy at z = 1.45 in the Subaru-XMM/Newton Deep Survey/UDS field, aiming at examining the internal distribution and properties of molecular gas in the galaxy. Our target galaxy consists of the bulge and d…
On the Persistent Poloidal Alfven Waves
Choi, Jiwon; Lee, Dong-Hun
Standing poloidal Alfven waves, radial oscillations with ultralow frequency of 5-20 mHz, are excited by wave-particle interaction in the magnetosphere. It has been a question over several decades why poloidal oscillations often persist and are not quickly converted into toroidal waves even when there is no corresponding particle source. By adoptin…
Searching for Gamma-Ray Binaries in Multiwavelength Catalogs
Luque-Escamilla, Pedro L.; Martí, Josep
The number of gamma-ray binaries currently known is still so small that even a new finding represents a significant expansion of its population. We present a possible hunting strategy based on screening different catalogs to filter potential peculiar stars consistent with gamma-ray sources whose association at lower energies is not yet certain. So…
Re-Analysis of the Cassini RPWS/LP Data in Titan's Ionosphere: 2. Statistics on 57 Flybys
Wahlund, J. -E.; Edberg, N. J. T.; Hadid, L. Z. +5 more
The ionosphere of Titan hosts a complex ion chemistry leading to the formation of organic dust below 1,200 km. Current models cannot fully explain the observed electron temperature in this dusty environment. To achieve new insight, we have re-analyzed the data taken in the ionosphere of Titan by the Cassini Langmuir probe (LP), part of the Radio a…
Detailed studies of IPHAS sources - II. Sab 19, a true planetary nebula and its mimic crossing the Perseus Arm
Guerrero, M. A.; Ramos-Larios, G.; Sabin, L. +2 more
The INT Photometric Hα Survey (IPHAS) has provided us with a number of new emission-line sources, among which planetary nebulae (PNe) constitute an important fraction. Here we present a detailed analysis of the IPHAS nebula Sab 19 (IPHASX J055242.8+262116) based on radio, infrared, and optical images and intermediate- and high-dispersion long-slit…
Unusual enhancement of 30 MeV proton flux in an ICME sheath region
Yashiro, Seiji; Nitta, Nariaki V.; Oka, Mitsuo +3 more
In gradual Solar Energetic Particle (SEP) events, shock waves driven by coronal mass ejections (CMEs) play a major role in accelerating particles, and the energetic particle flux enhances substantially when the shock front passes by the observer. Such enhancements are historically referred to as Energetic Storm Particle (ESP) events, but it remain…