Search Publications
Implications of the Stellar Mass Density of High-z Massive Galaxies from JWST on Warm Dark Matter
Gong, Yan; Chen, Xuelei; Lin, Hengjie +1 more
A significant excess of the stellar mass density at high redshift has been discovered from the early data release of James Webb Space Telescope (JWST), and it may require a high star formation efficiency. However, this will lead to large number density of ionizing photons in the epoch of reionization (EoR), so that the reionization history will be…
Two-dimensional Parameter Relationships for W UMa-type Systems Revisited
Poro, Atila; Paki, Ehsan; Hedayatjoo, Mahya +6 more
Reviewing the empirical and theoretical parameter relationships between various parameters is a good way to understand more about contact binary systems. In this investigation, two-dimensional (2D) relationships for P-M V(system), P-L 1,2, M 1,2-L 1,2, and q-L ratio were revisited. The sample…
Quantifying the Tension between Cosmological Models and JWST Red Candidate Massive Galaxies
Wang, Jun-Chao; Huang, Zhi-Qi; Huang, Lu +1 more
We develop a Python tool to estimate the tail distribution of the number of dark matter halos beyond a mass threshold and in a given volume in a light-cone. The code is based on the extended Press–Schechter model and is computationally efficient, typically taking a few seconds on a personal laptop for a given set of cosmological parameters. The hi…
Optical Transient Source AT2021lfa: A Possible "Dirty Fireball"
Jin, Zhi-Ping; Wei, Da-Ming; Ye, Xue-Mei +1 more
AT2021lfa, also known as ZTF21aayokph, was detected by the Zwicky Transient Facility on 2021 May 4, at 05:34:48 UTC. Follow-up observations were conducted using a range of ground-based optical telescopes, as well as Swift/XRT and VLA instruments. AT2021lfa is classified as an "orphan afterglow" candidate due to its rapid flux decline and its redde…
BSEC Method for Unveiling Open Clusters and its Application to Gaia DR3: 83 New Clusters
Li, Zhong-Mu; Mao, Cai-Yan
Open clusters (OCs) are common in the Milky Way, but most of them remain undiscovered. There are numerous techniques, including some machine-learning algorithms, available for the exploration of OCs. However, each method has its limitations and therefore, different approaches to discovering OCs hold significant values. We develop a comprehensive a…
Close Major-merger Pairs at z = 0: Star-forming Galaxies with Pseudobulges
Wang, Wei; Xu, Cong; Fang, Taotao +5 more
We present a study of star-forming galaxies (SFGs) with pseudobulges (bulges with Sérsic index n < 2) in a local close major-merger galaxy pair sample (H-KPAIR). With data from new aperture photometries in the optical and near-infrared bands (aperture size of 7 kpc) and from the literature, we find that the mean Age of central stellar populatio…
The Radcliffe Wave Parameters from Data on Open Star Clusters
Bobylev, V. V.; Bajkova, A. T.
A spectral analysis of the vertical positions and velocities of 374 open star clusters (OSCs) was carried out. We took these OSCs from the Hunt and Reffert catalog; they have an average age of about 10 million years, and are located on the galactic plane XY in a narrow zone inclined by 25° to the galactic axis Y. The following estimates of the par…
Confirmation of a Sub-Saturn-size Transiting Exoplanet Orbiting a G Dwarf: TOI-1194 b and a Very Low Mass Companion Star: TOI-1251 B from TESS
Zheng, Jie; Bieryla, Allyson; Howell, Steve B. +18 more
We report the confirmation of a sub-Saturn-size exoplanet, TOI-1194 b, with a mass of about
Cosmological Constraints on Neutrino Masses in Light of JWST Red and Massive Candidate Galaxies
Su, Yan; Huang, Zhi-Qi; Liu, Jian-Qi
The overabundance of the red and massive candidate galaxies observed by the James Webb Space Telescope (JWST) implies efficient structure formation or large star formation efficiency at high redshift z ∼ 10. In the scenario of a low or moderate star formation efficiency, because massive neutrinos tend to suppress the growth of structure of the uni…
A Statistical Study of Magnetic Flux Emergence in Solar Active Regions Prior to Strongest Flares
Abramenko, Valentina I.; Kutsenko, Alexander S.; Plotnikov, Andrei A.
Using the data on magnetic field maps and continuum intensity for Solar Cycles 23 and 24, we explored 100 active regions (ARs) that produced M5.0 or stronger flares. We focus on the presence/absence of the emergence of magnetic flux in these ARs 2–3 days before the strong flare onset. We found that 29 ARs in the sample emerged monotonically amidst…