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Prompt Emission Polarimetry of Gamma-Ray Bursts with the AstroSat CZT Imager
Rao, A. R.; Bhalerao, Varun; Mate, Sujay +10 more
X-ray and gamma-ray polarization measurements of the prompt emission of gamma-ray bursts (GRBs) are believed to be extremely important for testing various models of GRBs. So far, the available measurements of hard X-ray polarization of GRB prompt emission have not significantly constrained the GRB models, particularly because of the difficulty of …
Ellerman bombs and UV bursts: transient events in chromospheric current sheets
Carlsson, M.; Pereira, T. M. D.; Hansteen, V. +3 more
Context. Ellerman bombs (EBs), observed in the photospheric wings of the Hα line, and UV bursts, observed in the transition region Si IV line, are both brightenings related to flux emergence regions and specifically to magnetic flux of opposite polarity that meet in the photosphere. These two reconnection-related phenomena, nominally formed far ap…
The ALMA Fornax Cluster Survey I: stirring and stripping of the molecular gas in cluster galaxies
de Looze, Ilse; Baes, Maarten; Bendo, George J. +15 more
We present the first results of the ALMA Fornax Cluster Survey: a complete ALMA survey of all members of the Fornax galaxy cluster that were detected in H I or in the far-infrared with Herschel. The sample consists of a wide variety of galaxy types, ranging from giant ellipticals to spiral galaxies and dwarfs, located in all (projected) areas of t…
Gas flow and accretion via spiral streamers and circumstellar disks in a young binary protostar
Caselli, P.; Segura-Cox, D.; Zhao, B. +4 more
The majority of stars are part of gravitationally bound stellar systems, such as binaries. Observations of protobinary systems constrain the conditions that lead to stellar multiplicity and subsequent orbital evolution. We report high-angular resolution observations of the circumbinary disk around [BHB2007] 11, a young binary protostar system. The…
The Gas-Star Formation Cycle in Nearby Star-forming Galaxies. I. Assessment of Multi-scale Variations
Kruijssen, J. M. Diederik; Rosolowsky, Erik; Chevance, Mélanie +21 more
The processes regulating star formation in galaxies are thought to act across a hierarchy of spatial scales. To connect extragalactic star formation relations from global and kiloparsec-scale measurements to recent cloud-scale resolution studies, we have developed a simple, robust method that quantifies the scale dependence of the relative spatial…
The multiphase gas structure and kinematics in the circumnuclear region of NGC 5728
Lutz, D.; Genzel, R.; Sturm, E. +22 more
We report on our combined analysis of HST, VLT/MUSE, VLT/SINFONI, and ALMA observations of the local Seyfert 2 galaxy, NGC 5728 to investigate in detail the feeding and feedback of the active galactic nucleus (AGN). The data sets simultaneously probe the morphology, excitation, and kinematics of the stars, ionized gas, and molecular gas over a lar…
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies
Carilli, Chris; Somerville, Rachel S.; Bacon, Roland +31 more
We analyze the interstellar medium properties of a sample of 16 bright CO line emitting galaxies identified in the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This CO-selected galaxy sample is complemented by two additional CO line emitters in the UDF that are identified based on their Multi-Unit Spectroscopic …
Titan's gravity field and interior structure after Cassini
Iess, L.; Durante, Daniele; Hemingway, D. J. +2 more
Since its arrival at Saturn in 2004, Cassini performed nine flybys devoted to the determination of Titan's gravity field and its tidal variations. Here we present an updated gravity solution based on the final data set collected during the gravity-dedicated passes, before Cassini's plunge into Saturn's atmosphere. The data set includes an addition…
Quiet Sun magnetic fields: an observational view
Orozco Suárez, David; Bellot Rubio, Luis
The quiet Sun is the region of the solar surface outside of sunspots, pores, and plages. In continuum intensity it appears dominated by granular convection. However, in polarized light the quiet Sun exhibits impressive magnetic activity on a broad range of scales, from the 30,000 km of supergranular cells down to the smallest magnetic features of …
Uniformly hot nightside temperatures on short-period gas giants
Dang, Lisa; Cowan, Nicolas B.; Keating, Dylan
Short-period gas giants (hot Jupiters) on circular orbits are expected to be tidally locked into synchronous rotation, with permanent daysides that face their host stars and permanent nightsides that face the darkness of space1. Thermal flux from the nightside of several hot Jupiters has been detected, meaning energy is transported from…