Search Publications
Introducing the Condor Array Telescope. V. Deep Broad- and Narrowband Imaging Observations of the M81 Group
Walter, Frederick M.; Shara, Michael M.; Lanzetta, Kenneth M. +3 more
We used the Condor Array Telescope to obtain deep imaging observations through the luminance broadband and He II 468.6 nm, [O III] 500.7 nm, He I 587.5 nm, Hα, [N II] 658.4 nm, and [S II] 671.6 nm narrowband filters of an extended region comprising 13 "Condor fields" spanning ≈ 8 × 8 deg2 on the sky centered near M81 and M82. Here we de…
The Blue Horizontal-branch Stars from the LAMOST Survey: Atmospheric Parameters
Shi, Jianrong; Huang, Yang; Liu, Chao +4 more
Blue horizontal-branch (BHB) stars are crucial for studying the structure of the Galactic halo. Accurate atmospheric parameters of BHB stars are essential for investigating the formation and evolution of the Galaxy. In this work, a data-driven technique named Stellar Label Machine (SLAM) is used to estimate the atmospheric parameters of Large Sky …
A New X-Ray and Radio Burst Activity from the Magnetar SGR 1935+2154
Ibrahim, Alaa I.; Rehan, Noor S.
SGR 1935+2154 has emerged as the most active magnetar in recent years, exhibiting X-ray burst activity nearly annually and emitting a fast radio burst (FRB 200428 (FRB1)) in its 2020 April activity, for the first time from a Milky Way source, accompanied by an X-ray burst (XFRB1). The source was active again in 2021 September and 2022 J…
Calibrating the Color–Magnitude Relation of M Giants by Using Open Clusters
Hao, C. J.; Xu, Y.; Lin, Z. H. +8 more
M giants, with their distinctive properties such as high luminosity, serve as excellent indicators for mapping the structure of the Milky Way. The distance to distant M giants can be determined by using the color–magnitude relation (CMR), which is derived from color–magnitude diagrams of specific systems in previous studies. In this work, we aimed…
COSMIC-S: A Photometric Catalog of Observed Stars in the Small Magellanic Cloud
Franco, Antonio; Nucita, Achille A.; De Paolis, Francesco +1 more
The Dark Energy Camera (DECam) is a wide-field instrument mounted on the 4 m V. Blanco Telescope (Cerro Tololo Inter-American Observatory). Its impressive technical characteristics make it one of the most suitable ground-based telescopes for the production of accurate stellar photometry, even toward crowded regions such as the Magellanic Clouds. W…
Kinematics of Young Stellar Objects under Various Stellar Feedback
Xu, Y.; Yang, Longhui; Liu, Dejian +6 more
Based on the Gaia Data Release 3 and APOGEE data sets, we investigate the kinematic differences between young stellar objects (YSOs) and their parent clouds in five nearby star-forming regions. Overall, the one-dimensional velocity differences between Class II YSOs and their parent molecular cloud range from [0, 1.4] km s‑1. In feedback…
AstroSat UVIT Survey of M31: New Compact Source Catalog
Leahy, Denis; Ranasinghe, Sujith; Mitra, Saptadwipa +1 more
An ultraviolet survey of M31 was carried out during 2017–2023 with the UltraViolet Imaging Telescope (UVIT) instrument on board the AstroSat Observatory. Here we present far- and near-ultraviolet (FUV and NUV) observations from the M31 UVIT survey, which covers a sky area of ≃3
The Stellar Abundances and Galactic Evolution Survey (SAGES). II. Machine Learning–based Stellar Parameters for 21 Million Stars from the First Data Release
Zhao, Gang; Fan, Zhou; Wang, Wei +14 more
Stellar parameters for large samples of stars play a crucial role in constraining the nature of stars and stellar populations in the Galaxy. An increasing number of medium-band photometric surveys are presently used in estimating stellar parameters. In this study, we present a machine learning approach to derive estimates of stellar parameters, in…
The UNCOVER Survey: A First-look HST + JWST Catalog of 60,000 Galaxies near A2744 and beyond
Papovich, Casey; Maseda, Michael V.; Franx, Marijn +43 more
In 2022 November, the James Webb Space Telescope (JWST) returned deep near-infrared images of A2744-a powerful lensing cluster capable of magnifying distant, incipient galaxies beyond it. Together with existing Hubble Space Telescope (HST) imaging, this publicly available data set opens a fundamentally new discovery space to understand the remaini…
ALMA Lensing Cluster Survey: Deep 1.2 mm Number Counts and Infrared Luminosity Functions at z ≃ 1–8
Ouchi, Masami; Ivison, R. J.; Koekemoer, Anton M. +40 more
We present a statistical study of 180 dust continuum sources identified in 33 massive cluster fields by the Atacama Large Millimeter/submillimeter Array Lensing Cluster Survey (ALCS) over a total of 133 arcmin2 area, homogeneously observed at 1.2 mm. ALCS enables us to detect extremely faint millimeter sources by lensing magnification, …