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Assessing the potential of cluster edges as a standard ruler on constraining dark energy models
Wang, Deng
We assess comprehensively the potential of galaxy cluster edges as a standard ruler in measuring cosmological distances and probing exotic physics. Confronting five alternative cosmological models with cluster edges from the near-future Dark Energy Spectroscopic Instrument survey, we conclude that cluster edges can serve as a promising probe to co…
Fundamental Parameters of the Eclipsing Binary DD CMa and Evidence for Mass Exchange
González, J. F.; Mennickent, R. E.; Cabezas, M. +5 more
We present a detailed photometric and spectroscopic analysis of DD CMa, based on published survey photometry and new spectroscopic data. We find an improved orbital period of Po = 2.0084530(6) days. Our spectra reveal Hβ and Hα absorptions with weak emission shoulders, and we also find a color excess in the Wide-field Infrared Survey Ex…
Exploration of the Origin of Galactic and Extragalactic Star Clusters through Simulated H-R Diagrams
Chattopadhyay, Tanuka; Mondal, Sreerup; Paul, Suman +2 more
The present work explores the origin of the formation of star clusters in our Galaxy and in the Small Magellanic Cloud (SMC) through simulated H-R diagrams and compare those with observed star clusters. The simulation study produces synthetic H-R diagrams through the Markov Chain Monte Carlo (MCMC) technique using the star formation history (SFH),…
The Dark Side of Pluto
White, Oliver L.; Bertrand, Tanguy; McKinnon, William B. +10 more
During its departure from Pluto, New Horizons used its LORRI camera to image a portion of Pluto's southern hemisphere that was in a decades-long seasonal winter darkness, but still very faintly illuminated by sunlight reflected by Charon. Recovery of this faint signal was technically challenging. The bright ring of sunlight forward-scattered by ha…
1H 0707-495: An AGN is dimming its X-ray light
Boller, Thomas
We report on one of the first science observations obtained during the Calibration and Verification phase of extended ROentgen Survey with an Imaging Telescope Array (eROSITA) aboard the Spectrum-Roentgen-Gamma (SRG) mission on the famous Narrow-Line Seyfert 1 Galaxy 1H 0707-495. 1H 0707-495 is a highly variable AGN, with a complex, steep X-ray sp…
Signatures of coronal hole substructure in the solar wind: combined Solar Orbiter remote sensing and in situ measurements
Livi, S.; Solanki, S. K.; Zhukov, A. N. +21 more
Context. The Sun's complex corona is the source of the solar wind and interplanetary magnetic field. While the large scale morphology is well understood, the impact of variations in coronal properties on the scale of a few degrees on properties of the interplanetary medium is not known. Solar Orbiter, carrying both remote sensing and in situ instr…
Study of the open cluster Alessi-Teutsch 9 (ASCC 10) using multiband photometry and Gaia EDR3
Sánchez, Néstor; López-Martínez, Fátima; Ocando, Sandra +1 more
There is a growing interest in the automated characterization of open clusters using data from the Gaia mission. This work evidences the importance of choosing an appropriate sampling radius (the radius of the circular region around the cluster used to extract the data) and the usefulness of additional multiband photometry in order to achieve accu…
Characterisation of cosmic ray induced noise events in AstroSat-CZT imager
Rao, A. R.; Ratheesh, A.; Mithun, N. P. S. +6 more
The Cadmium Zinc Telluride (CZT) Imager onboard AstroSat consists of pixelated CZT detectors, which are sensitive to hard X-rays above 20 keV. The individual pixels are triggered by ionising events occurring in them, and the detectors operate in a self-triggered mode, recording each event separately with information about its time of incidence, de…
Probing Polarization and the Role of Magnetic Fields in Cloud Destruction in the Keyhole Nebula
Dowell, C. Darren; Majumdar, Liton; Goldsmith, Paul F. +2 more
We present polarimetric observations of the Keyhole Nebula in the Carina Nebula Complex carried out using the Stratospheric Observatory for Infrared Astronomy. The Keyhole Nebula, located to the west of η Carinae, is believed to be disturbed by the stellar winds from the massive star. We observed the Keyhole Nebula at 89 µm wavelength with t…
Tailward Flows in the Vicinity of Fast Earthward Flows
Gunell, H.; Hamrin, M.; Pitkänen, T. +3 more
The occurrence of tailward flows in the magnetotail plasma sheet is closely linked to the dynamics of earthward bursty bulk flows (BBFs). Tailward flows that are observed in the vicinity of these BBFs (or TWABs - Tailward flows around BBFs) may hold unique information on its origin. In this study, we conduct a statistical survey on TWABs by using …