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Propagation and domains of the invariant ion-acoustic solitons in the plasmas
Saberian, E.
Observational pieces of evidence of space probes Voyagers and IBEX to study the Sun's heliosphere, the outer Solar system, and interstellar space beyond the Sun's heliosphere indicate that perturbations in some regions may occur in situations out of the pure thermal equilibrium, e.g., in the outer heliosphere regions, the inner heliosheath regions…
Lyman Continuum Leakers at z > 3 in the GOODS-S Field: Starburst or Not?
Zheng, Zhen-Ya; Yuan, Fang-Ting; Lin, Ruqiu +2 more
We investigate the star-forming properties of 23 Lyman continuum (LyC) leakers at z > 3 in the Great Observatories Origins Deep Survey-South field based on a systematic review of LyC observations from the literature. Using data from the Hubble Space Telescope and the James Webb Space Telescope, we construct the spectral energy distributions for…
H I studies of extremely metal-poor dwarfs in voids - I
Pustilnik, Simon A.; Kurapati, Sushma; Egorova, Evgeniya S.
We present and discuss the results of the Giant Metrewave Radio Telescope H I 21-cm line mapping for five isolated low-mass (M$_{\rm bary}$$\sim$(2-8)$\times 10^7$ M$\odot$) eXtremely Metal Poor dwarfs [12+$\log$(O/H) = 7.13-7.28], selected from the nearby void galaxy sample. All the studied void dwarfs show disturbed morphology in the H I maps wi…
Is the RSGC4 (Alicante 8) Cluster a Real Star Cluster? Peculiar Radial Velocities of Red Supergiant Stars
Lee, Jae-Joon; Myeong, GyuChul; Oh, Heeyoung +1 more
Young massive star clusters, like the six red supergiant clusters in the Scutum complex, provide valuable insights into star formation and galaxy structures. We investigated the high-resolution near-infrared spectra of 60 RSG candidates in these clusters using the Immersion Grating Infrared Spectrograph. Among the candidates in RSGC4, we found sig…
JWST Observations Constrain the Time Evolution of Fine Structure Constants and Dark Energy-electromagnetic Coupling
Feng, Lei; Lei, Lei; Fan, Yi-Zhong +1 more
It was hypothesized in the literature that some physical parameters may be time-evolving and the astrophysical data can serve as a probe. Recently, the James Webb Space Telescope (JWST) released its early observations. In this work, we select the JWST spectroscopic observations of the high redshift (z > 7.1) galaxies with strong [O III] (λ = 49…
J-PLUS: Bayesian object classification with a strum of BANNJOS
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Vázquez Ramió, H. +22 more
Context. With its 12 optical filters, the Javalambre-Photometric Local Universe Survey (J-PLUS) provides an unprecedented multicolor view of the local Universe. The third data release (DR3) covers 3192 deg2 and contains 47.4 million objects. However, the classification algorithms currently implemented in the J-PLUS pipeline are determin…
Nested active regions anchor the heliospheric current sheet and stall the reversal of the coronal magnetic field
Finley, A. J.
Context. During the solar cycle, the Sun's magnetic field polarity reverses due to the emergence, cancellation, and advection of magnetic flux towards the rotational poles. Flux emergence events occasionally cluster together, although it is unclear if this is due to the underlying solar dynamo or simply by chance. Aims. Regardless of the cause, we…
Probing the inner Galactic halo with blue horizontal-branch stars. Gaia DR3-based catalogue with atmospheric and stellar parameters
Geier, S.; Heber, U.; Pelisoli, I. +4 more
Context. Stars that are found on the blue horizontal-branch (BHB) evolved from low-mass stars that have completed their core hydrogen-burning main sequence (MS) stage and undergone the helium flash at the end of their red giant phase. Hence, they are very old objects that can be used as markers in studying galactic structure and formation history.…
TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit
Alonso, R.; Bouchy, F.; Deleuil, M. +129 more
We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine…
A network of cooler white dwarfs as infrared standards for flux calibration
Sahu, Snehalata; Bohlin, Ralph C.; Gentile Fusillo, Nicola Pietro +6 more
The accurate flux calibration of observational data is vital for astrophysics and cosmology because absolute flux uncertainties of stellar standards propagate into scientific results. With the ever higher precision achieved by telescopic missions (e.g. JWST) in the infrared (IR), suitable calibrators are required for this regime. The basis of the …