Search Publications
Chemo-dynamical Evolution of Simulated Satellites for a Milky Way–like Galaxy
Beers, Timothy C.; Anguiano, Borja; Ishigaki, Miho N. +5 more
The chemical abundances of Milky Way's (MW's) satellites reflect their star formation histories (SFHs), yet, due to the difficulty of determining the ages of old stars, the SFHs of most satellites are poorly measured. Ongoing and upcoming surveys will obtain around 10 times more medium-resolution spectra for stars in satellites than are currently …
North-South asymmetries in the Galactic thin disc associated with the vertical phase spiral as seen using LAMOST-Gaia stars
Tian, Haijun; Bird, Sarah A.; Liu, Gaochao +5 more
We select 1052 469 (754 635) thin disc stars from Gaia eDR3 and LAMOST DR7 in the range of Galactocentric radius R (guiding centre radius Rg) from 8 to 11 kpc to investigate the asymmetries between the North and South of the disc mid-plane. More specifically, we analyse the vertical velocity dispersion profiles ($\sigma _{v_{z}}(z$)) in…
Modeling X-Ray and Gamma-Ray Emission from Redback Pulsar Binaries
An, Hongjun; Wadiasingh, Zorawar; Sim, Minju
We investigated the multiband emission from the pulsar binaries XSS J12270‑4859, PSR J2039‑5617, and PSR J2339‑0533, which exhibit orbital modulation in the X-ray and gamma-ray bands. We constructed the sources' broadband spectral energy distributions and multiband orbital light curves by supplementing our X-ray measurements with published gamma-r…
Deciphering the Milky Way disc formation time encrypted in the bar chrono-kinematics
Belokurov, Vasily; Ardern-Arentsen, Anke; Zhang, Hanyuan +3 more
We present a novel method to constrain the formation time of the Milky Way disc using the chrono-kinematic signatures of the inner Galaxy. We construct an O-rich Mira variable sample from the Gaia long-period variable catalogue to study the kinematic behaviour of stars with different ages in the inner Galaxy. From the Auriga suite of cosmological …
X-ray spectral properties of dust-obscured galaxies in the XMM-SERVS coverage of the XMM-LSS field
Kayal, Abhijit; Singh, Veeresh
With an aim to unveil the population of obscured active galactic nuclei (AGN) hosted in high-z dust-obscured galaxies (DOGs), we performed X-ray spectral study of 34 DOGs (0.59 ≤ z ≤ 4.65) lying within 5.3 square degrees of the XMM-Spitzer Extragalactic Representative Volume Survey (XMM-SERVS) coverage in the XMM-Large Scale Structure (XMM-LSS) fi…
The S-PLUS Ultra-Short Survey: First data release
Beers, Timothy C.; Placco, Vinicius M.; Limberg, Guilherme +15 more
Context. This paper presents the first public data release of the S-PLUS Ultra-Short Survey (USS), a photometric survey with short exposure times, covering approximately 9300 deg2 of the Southern sky. The USS utilizes the Javalambre 12-band magnitude system, including narrow, medium, and broad-band filters targeting prominent stellar sp…
Sun-like stars produce superflares roughly once per century
Solanki, Sami K.; Notsu, Yuta; Maehara, Hiroyuki +7 more
Stellar superflares are energetic outbursts of electromagnetic radiation that are similar to solar flares but release more energy, up to 1036 erg on main-sequence stars. It is unknown whether the Sun can generate superflares and, if so, how often they might occur. We used photometry from the Kepler space observatory to investigate super…
A statistical and multiwavelength photometric analysis of a young embedded open star cluster: IC 1590
Medhi, Biman J.; Sheikh, A. H.
We present a statistical and multiwavelength photometric studies of young open cluster IC 1590. We identified 91 cluster members using Gaia DR3 astrometry data using ensemble-based unsupervised machine learning techniques. From Gaia EDR3 data, we estimate the best-fitting parameters for IC 1590 using the Automated Stellar Cluster Analysis package …
Investigations of Massive Filaments and Star Formation (INFANT). I. Core Identification and Core Mass Function
Sanhueza, Patricio; Gu, Qilao; Liu, Tie +16 more
Filamentary structures are ubiquitously found in high-mass star-forming clouds. To investigate the relationship between filaments and star formation, we carry out the INFANT (Investigations of Massive Filaments and Sar Formation) survey, a multiscale, multiwavelength survey of massive filamentary clouds with Atacama Large Millimeter/submillimeter …
The frequency and sizes of inner bars and nuclear rings in barred galaxies and their dependence on galaxy properties
Erwin, Peter
Using a volume- and mass-limited (D < 30 Mpc, $\log \, (M_{\star }/M_{\odot })\ge 9.75$) sample of 155 barred S0-Sd galaxies, I determine the fraction with secondary structures within their bars. Some 20 ± 3 per cent have a separate inner bar, making them double-barred; an identical fraction have nuclear rings, with $11^{+3}_{-2}$ per cent host…