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New measurements of the cyclotron line energy in Cen X-3
Paul, Biswajit; Pradhan, Pragati; Tomar, Gunjan
We report results from the analysis of data from two observations of the accreting binary X-ray pulsar Cen X-3 carried out with the broad-band X-ray observatories Suzaku and NuSTAR. The pulse profile is dominated by a broad single peak and show some energy dependence with two additional weak pulse peaks at energies below 15 and 25 keV, respectivel…
Jupiter's Great Red Spot: Strong Interactions With Incoming Anticyclones in 2019
Hansen, C. J.; Hueso, R.; Sánchez-Lavega, A. +19 more
Jupiter's Great Red Spot (GRS), a giant anticyclone, is the largest and longest lived of all the vortices observed in planetary atmospheres. During its history, the GRS has shrunk to half its size since 1879, and encountered many smaller anticyclones and other dynamical features that interacted in a complex way. In 2018-2020, while having a histor…
Photometric and Spectroscopic Analysis of Four Contact Binaries
Joshi, Y. C.; Panchal, A.
We present the photometric and spectroscopic analysis of four W UMa binaries J015829.5+260333 (hereinafter as J0158), J030505.1+293443 (hereinafter as J0305), J102211.7+310022 (hereinafter as J1022), and KW Psc. The VRcIc band photometric observations are carried out with the 1.3 m Devasthal Fast Optical Telescope (DFOT). For…
Surveying the Bright Stars by Optical Interferometry. III. A Magnitude-limited Multiplicity Survey of Classical Be Stars
Hutter, D. J.; Tycner, C.; Zavala, R. T. +3 more
We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar Interferometer. The interferometric observations were used to detect companions in 10 previously known binary systems. For two of these sources (66 Oph and β Cep) …
High-sensitivity radio study of the non-thermal stellar bow shock EB27
del Palacio, Santiago; Benaglia, Paula; Hales, Christopher +1 more
We present a deep radio-polarimetric observation of the stellar bow shock EB27 associated with the massive star BD+43○3654. This is the only stellar bow shock confirmed to have non-thermal radio emission. We used the Jansky Very Large Array in S band (2-4 GHz) to test whether this synchrotron emission is polarized. The unprecedented sen…
An ACA Survey of [C I] 3P1-3P0, CO J = 4 - 3, and Dust Continuum in Nearby U/LIRGs
Ho, Luis C.; Bolatto, Alberto D.; Tadaki, Ken-ichi +11 more
We present the results of surveying [C I] 3P1-3P0, 12CO J = 4 - 3, and 630 µm dust continuum emission for 36 nearby ultra/luminous infrared galaxies (U/LIRGs) using the Band 8 receiver mounted on the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array. We describe t…
A holistic review of a galactic interaction
Laporte, Chervin F. P.; Drimmel, Ronald; Johnston, Kathryn V. +3 more
Our situation as occupants of the Milky Way (MW) Galaxy, bombarded by the Sagittarius dwarf galaxy, provides an intimate view of physical processes that can lead to the dynamical heating of a galactic disc. While this evolution is instigated by Sagittarius, it is also driven by the intertwined influences of the dark matter halo and the disc itself…
Solar Orbiter observations of the Kelvin-Helmholtz waves in the solar wind
Fedorov, A.; Lavraud, B.; Génot, V. +17 more
Context. The Kelvin-HeImholtz (KH) instability is a nonlinear shear-driven instability that develops at the interface between shear flows in plasmas. KH waves have been inferred in various astrophysical plasmas, and have been observed in situ at the magnetospheric boundaries of solar-system planets and through remote sensing at the boundaries of c…
Classifying stars, galaxies, and AGNs in CLAUDS + HSC-SSP using gradient boosted decision trees
Sawicki, Marcin; Goulding, Andy D.; Coupon, Jean +1 more
Classifying catalogue objects as stars, galaxies, or active galactic nuclei (AGNs) is a crucial part of any statistical study of galaxies. We describe our pipeline for binary (star/galaxy) and multiclass (star/galaxy/Type I AGN/Type II AGN) classification developed for the very deep CLAUDS + HSC-SSP u*grizy data set. Our method uses the XGBoost im…
High-resolution LAsMA 12CO and 13CO observation of the G305 giant molecular cloud complex. I. Feedback on the molecular gas
Menten, K. M.; Wyrowski, F.; Thompson, M. A. +3 more
Context. Understanding the effect of feedback, interaction of young massive stars with their parental giant molecular clouds, is of central importance for studies of the interstellar medium and star formation.
Aims: We observed the G305 star-forming complex in the J = 3-2 lines of 12CO and 13CO to investigate how molecul…