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A survey for variable young stars with small telescopes - IV. Rotation periods of YSOs in IC 5070
Scholz, Aleks; Eislöffel, Jochen; Price, Mark C. +50 more
Studying rotational variability of young stars is enabling us to investigate a multitude of properties of young star-disc systems. We utilize high cadence, multiwavelength optical time series data from the Hunting Outbursting Young Stars citizen science project to identify periodic variables in the Pelican Nebula (IC 5070). A double blind study us…
Core Mass Estimates in Strong Lensing Galaxy Clusters: A Comparison between Masses Obtained from Detailed Lens Models, Single-halo Lens Models, and Einstein Radii
Sharon, K.; Gladders, M. D.; Bleem, L. E. +7 more
The core mass of galaxy clusters is both an important anchor of the radial mass distribution profile and a probe of structure formation. With thousands of strong lensing galaxy clusters being discovered by current and upcoming surveys, timely, efficient, and accurate core mass estimates are needed. We assess the results of two efficient methods to…
Two-Stage Evolution of an Extended C-Class Eruptive Flaring Activity from Sigmoid Active Region NOAA 12734: SDO and Udaipur-CALLISTO Observations
Monstein, Christian; Joshi, Bhuwan; Mitra, Prabir K. +4 more
In this article, we present a multi-wavelength investigation of a C-class flaring activity that occurred in the active region NOAA 12734 on 8 March 2019. The investigation utilizes data from the Atmospheric Imaging Assembly (AIA) and the Helioseismic Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) and the Udaipur-CALLISTO solar…
Searching for Extragalactic Exoplanetary Systems: The Curious Case of BD+20 2457
Limberg, Guilherme; Rossi, Silvia; Borbolato, Lais +4 more
Planets and their host stars carry a long-term memory of their origin in their chemical compositions. Thus, identifying planets formed in different environments improves our understating of planetary formation. Although restricted to detecting exoplanets within the solar vicinity, we might be able to detect planetary systems that formed in small e…
Kinematic complexity around NGC 419: resolving the proper motion of the cluster, the Small Magellanic Cloud, and the Magellanic bridge
Bellini, Andrea; Libralato, Mattia; Massari, Davide +1 more
We present Hubble Space Telescope proper motions in the direction of the star cluster NGC 419 in the Small Magellanic Cloud. Because of the high precision of our measurements, for the first time it is possible to resolve the complex kinematics of the stellar populations located in the field, even along the tangential direction. In fact, the proper…
Estimating black hole masses in obscured AGN using X-rays
Gliozzi, Mario; Williams, James K.; Michel, Dina A.
Determining the black hole masses in active galactic nuclei (AGN) is of crucial importance to constrain the basic characteristics of their central engines and shed light on their growth and co-evolution with their host galaxies. While the black hole mass (MBH) can be robustly measured with dynamical methods in bright type 1 AGN, where t…
Narrow belt of debris around the Sco-Cen star HD 141011
Pinte, C.; Milli, J.; Menard, F. +22 more
Context. We initiated a deep-imaging survey of Scorpius-Centaurus A-F stars in 2015. These stars are predicted to host warm inner and cold outer belts of debris reminiscent of the architecture of emblematic systems such as HR 8799.
Aims: We present resolved images of a ring of debris around the F5-type star HD 141011 that was observed as part…
Energetic Charged Particles in the Terrestrial Magnetosphere: Cluster/RAPID Results
Daly, P. W.; Klecker, B.; Malykhin, A. Yu. +3 more
In this work, we review the results of observations by the Cluster/Research with Adaptive Particle Imaging Detectors (RAPID) energetic charged particle detector (∼>40 keV-∼1 MeV). The origin of energetic ions in the region upstream of the Earth's bow shock is compared under different solar wind conditions. We give a brief overview of the accele…
Multi-wavelength analysis of CME-driven shock and Type II solar radio burst band-splitting
Ebenezer, E.; Lata Soni, Shirsh; lal Yadav, Manohar
It is now well established that Coronal Mass Ejections (CMEs) may produce shocks in near Sun and interplanetary medium. A Type-II radio burst is characterized by shock and associated emission with very slow frequency drift rate (∼0.1 MHz/sec). A CME driven shock and their velocity, acceleration/deceleration signature can be observed by a Type-II s…
The initial properties of young star clusters in M83
Sills, Alison; Webb, Jeremy J.
The initial sizes and masses of massive star clusters provide information about the cluster formation process and also determine how cluster populations are modified and destroyed, which have implications for using clusters as tracers of galaxy assembly. Young massive cluster populations are often assumed to be unchanged since cluster formation; t…