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Growing a nuclear star cluster from star formation and cluster mergers: The JWST NIRSpec view of NGC 4654
Arribas, Santiago; Bunker, Andrew J.; Lützgendorf, Nora +10 more
We present a detailed study of the centre of NGC 4654, a Milky Way-like spiral galaxy in the Virgo cluster that has been reported to host a double stellar nucleus, thus promising a rare view of ongoing star cluster infall into a galaxy nucleus. Analysing JWST NIRSpec integral-field spectroscopic data in combination with Hubble Space Telescope Wide…
Testing the surface brightness fluctuation method on dwarf galaxies in the COSMOS field
Taylor, James E.; Blakeslee, John P.; Foster, Lauren M.
Dwarf galaxies are important tracers of small-scale cosmological structure, yet much of our knowledge about these systems comes from the limited sample of dwarf galaxies within the Local Group. To make a comprehensive inventory of dwarf populations in the local Universe, we require effective methods for deriving distance estimates for large number…
A spectroscopic and kinematic survey of fast hot subdwarfs
Rauch, T.; Geier, S.; Gänsicke, B. T. +19 more
Hot subdwarfs (sdO/B) are the stripped helium cores of red giants formed via binary interactions. Close hot subdwarf binaries with massive white dwarf companions have been proposed as possible progenitors of thermonuclear supernovae type Ia (SN Ia). If the supernova is triggered by stable mass transfer from the helium star, the companion should su…
The Ionosphere of Mars After 20 Years of Mars Express Contributions
Pätzold, Martin; González-Galindo, Francisco; Holmström, Mats +6 more
The Martian ionosphere originates from the ionization of the planetary neutral atmosphere by solar radiation. This conductive layer is embedded within the thermosphere and exosphere of Mars where it forms a highly variable interaction region with the solar wind. The Martian ionosphere has been continuously observed by the three plasma instruments …
ExoplaNeT accRetion mOnitoring sPectroscopic surveY (ENTROPY): I. Evidence for magnetospheric accretion in the young isolated planetary-mass object 2MASS J11151597+1937266
Viswanath, Gayathri; Janson, Markus; Szulágyi, Judit +7 more
Context. Accretion among planetary mass companions is a poorly understood phenomenon, due to the lack of both observational and theoretical studies. The detection of emission lines from accreting gas giants facilitates detailed investigations into this process. Aims. This work presents a detailed analysis of Balmer lines from one of the few known …
Complete analysis of the subgiant stellar system: HIP 102029
Mardini, Mohammad K.; Al-Wardat, Mashhoor A.; Abu-Alrob, Enas M. +2 more
In this work, we present a detailed analysis of the individual components of the visual binary system HIP 102029 (R.A. = 20:40:35.32, Dec. = +15:38:35.63). The system was discovered during the European Space Agency Hipparcos mission and has a separation of 220 mas. The analysis uses the ORBITX code and Al-Wardat's method to estimate the orbital, a…
Identification of Planetary and Proto-Planetary Nebulae Candidates Through AKARI Infrared Photometry
Corral, L. J.; Ramos-Larios, G.; Kemp, S. N. +3 more
We utilized photometric data from the space telescope AKARI to identify potential planetary nebulae (PNe) and proto-planetary nebulae (PPNe) candidates. Using the color-color diagram, we found a region with a high concentration of established PNe and PPNe, comprising about 95% of the objects. Based on this, we identified 67 objects within this reg…
An X-Ray Shell Reveals the Supernova Explosion for Galactic Microquasar SS 433
Safi-Harb, Samar; Feng, Hua; Zhou, Ping +5 more
How black holes are formed remains an open and fundamental question in astrophysics. Despite theoretical predictions, it lacks observations to understand whether the black hole formation experiences a supernova explosion. Here we report the discovery of an X-ray shell north of the Galactic microquasar SS 433 harboring a stellar-mass black hole spa…
Primeval very low-mass stars and brown dwarfs - VIII. The first age benchmark L subdwarf, a wide companion to a halo white dwarf
Smart, R. L.; Raddi, R.; Pinfield, D. J. +12 more
We report the discovery of five white dwarf + ultracool dwarf systems identified as common proper motion wide binaries in the Gaia Catalogue of Nearby Stars. The discoveries include a white dwarf + L subdwarf binary, VVV 1256-62AB, a gravitationally bound system located 75.6$^{+1.9}_{-1.8}$ pc away with a projected separation of 1375$^{+35}_{-33}$…
SAGUARO: Time-domain Infrastructure for the Fourth Gravitational-wave Observing Run and Beyond
Sand, David J.; Fong, Wen-fai; Paterson, Kerry +14 more
We present upgraded infrastructure for Searches After Gravitational waves Using ARizona Observatories (SAGUARO) during LIGO, Virgo, and KAGRA's fourth gravitational-wave (GW) observing run (O4). These upgrades implement many of the lessons we learned after a comprehensive analysis of potential electromagnetic counterparts to the GWs discovered dur…