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Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
Scholz, R. -D.
Context. Hypervelocity stars (HVSs) unbound to the Galaxy can be formed with extreme stellar interactions, for example close encounters with supermassive black holes or in massive star clusters, supernova explosions in binary systems, or the stripping of dwarf galaxies. Observational evidence comes from measurements of radial velocities (RVs) of o…
Polycyclic aromatic hydrocarbon luminous galaxies in JWST CEERS data
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +9 more
It has been an unanswered question how many dusty galaxies have been undetected from the state-of-the-art observational surveys. JWST enables us to detect faint infrared (IR) galaxies that have prominent polycyclic aromatic hydrocarbon (PAH) features in the mid-IR wavelengths. PAH is a valuable tracer of star formation and dust properties in the m…
Spectroscopic Survey of Faint Planetary-nebula Nuclei. V. The EGB 6-type Central Star of Abell 57
Bond, Howard E.; Ciardullo, Robin; Zeimann, Gregory R. +3 more
During our spectroscopic survey of central stars of faint planetary nebulae (PNe), we found that the nucleus of Abell 57 exhibits strong nebular emission lines. Using synthetic narrowband images, we show that the emission arises from an unresolved compact emission knot (CEK) coinciding with the hot (90,000 K) central star. Thus Abell 57 belongs to…
Narrow absorption line outflow in Seyfert 1 galaxy J1429+4518: outflow's distance from the central source and its energetics
Arav, N.; Dehghanian, M.; Walker, G. +2 more
In the Hubble Space Telescope/Cosmic Origins Spectrograph spectrum of the Seyfert 1 galaxy 2MASX J14292507+4518318, we have identified a narrow absorption line outflow system with a velocity of -151 km s-1. This outflow exhibits absorption troughs from the resonance states of ions like C IV, N V, S IV, and Si II, as well as excited stat…
The HST Nondetection of SN Ia 2011fe 11.5 yr after Explosion Further Restricts Single-degenerate Progenitor Systems
Shappee, B. J.; Tucker, M. A.
We present deep Hubble Space Telescope imaging of the nearby Type Ia supernova (SN Ia) 2011fe obtained 11.5 yr after explosion. No emission is detected at the SN location to a 1σ (3σ) limit of F555W > 30.2 (29.0) mag, or equivalently M V > 1.2 (‑0.1) mag, neglecting the distance uncertainty to M101. We constrain the presence of …
Searching for magnetar binaries disrupted by core-collapse supernovae
El-Badry, Kareem; Connor, Liam; Sharma, Kritti +5 more
Core-collapse supernovae (CCSNe) are considered the primary magnetar formation channel, with 15 magnetars associated with supernova remnants (SNRs). A large fraction of these should occur in massive stellar binaries that are disrupted by the explosion, meaning that $\sim 45~{{\ \rm per\ cent}}$ of magnetars should be nearby high-velocity stars. He…
Pulsar-based map of galactic acceleration
Moran, Abigail; Mingarelli, Chiara M. F.; Van Tilburg, Ken +1 more
Binary pulsars can be used to probe Galactic potential gradients through calculating their line-of-sight accelerations. We present the first data release of direct line-of-sight acceleration measurements for 29 binary pulsars. We validate these data with a local acceleration model, and compare our results to those from earlier works. We find evide…
Front-row Seat of the Recent R Aqr Periastron Passage: X-Ray Multiepoch Spectral and Spatial Analysis
Raymond, John; Sacchi, Andrea; Karovska, Margarita +7 more
We report on the X-ray spectral and spatial evolution of the symbiotic star R Aqr. Through a multiepoch observational campaign performed with Chandra between 2017 and 2022, we study the X-ray emission of this binary system, composed of an evolved red giant star and a white dwarf (WD). This analysis is particularly timely as the WD approached the p…
The Milky Way tomography with Subaru Hyper Suprime-Cam. I. Halo substructures
Komiyama, Yutaka; Takada, Masahiro; Tanaka, Masayuki +7 more
We analyze the photometric data in the Wide layer of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) over ~1200 deg2 to uncover new halo substructures beyond the distance, D⊙ ~ 30 kpc, from the Sun. For this purpose, we develop an isochrone filter for an old, metal-poor stellar system to extract the faint main-sequen…
Star formation in extreme environments: A 200 pc high velocity gas stream in the Galactic centre
Menten, K. M.; Schilke, P.; Fuller, G. A. +9 more
Context. The expanding molecular ring (EMR) manifests itself as a parallelogram in the position-velocity diagram of spectral line emission from the Central Molecular Zone (CMZ) surrounding the Galactic centre (GC). It is a high velocity (| VLSR | > 100 km s‑1) extended molecular gas structure. The formation of the EMR is b…