30,558 datasets found

We present detailed criteria for the classification of subtypes of B-type supergiants and apply them to 97 supergiants chosen manually from the LAMOST DR5 data set. We obtained...

Studying the physical and chemical properties of cold and dense molecular clouds is crucial for the understanding of how stars form. Under the typical conditions of infrared...

The accuracy in determining the spatial-kinematical parameters of open clusters makes them ideal tracers of the Galactic structure. Young open clusters (YOCs) are the main...

It is generally assumed that galaxies are a bimodal population in both star formation and structure; star-forming galaxies are disks, while passive galaxies host large bulges or...

The dynamical states of molecular clouds may affect the properties of the stars they form. In the vicinity of the Trifid Nebula (d=1180+/-25pc), the main star cluster (Trifid...

We use Gaia DR3 data to study the Collinder 132-Gulliver 21 region via the machine-learning algorithm StarGO and find eight subgroups of stars (ASCC 32, Collinder 132 gp 1-6,...

Observations of some starburst-driven galactic superwinds suggest that strong radiative cooling could play a key role in the nature of feedback and the formation of stars and...

We present new light curves for the four bright images of the five image cluster-lensed quasar gravitational lens system SDSS J1004+4112. The light curves span 14.5yr and allow...

Although a large number of Galactic open clusters (OCs) have been identified, the internal kinematic properties (e.g., rotation) of almost all the known OCs are still far from...

We present an entirely new sample of 388 low-mass galaxies (M_<=10^10^M{sun}) that have spectroscopic signatures indicating the presence of massive black holes (BHs) in the...

Galaxy sizes and their evolution over cosmic time have been studied for decades and serve as key tests of galaxy formation models. However, at z>~1 these studies have been...

We present X-ray, UV, optical, and radio observations of the nearby (~78Mpc) tidal disruption event AT2021ehb/ZTF21aanxhjv during its first 430 days of evolution. AT2021ehb...

Using Hubble Space Telescope/ACS H{alpha} images of SNR 0509-67.5 taken ~10yr apart, we measure the forward shock (FS) proper motions (PMs) at 231 rim locations. The average...

In this paper, an investigation on the relative importance of the thermal gas, radiation, and (minimum-energy) magnetic pressures around ~200 star-forming regions in a sample of...

Observations of high-redshift galaxies (z>5) have shown that these galaxies have extreme emission lines with equivalent widths much larger than their local star-forming...

We report the serendipitous discovery of an elliptical shell of CO associated with the faint stellar object SSTc2d J163134.1-240060 as part of the "Ophiuchus Disk Survey...

We present photometric and spectroscopic observations of the nearby (D~28Mpc) interacting supernova (SN) 2019esa, discovered within hours of explosion and serendipitously...

We present observations of the J=1-0 transition lines of ^12^CO, ^13^CO, and C^18^O toward the Galactic region of 153.60{deg}<=l<=156.50{deg} and...

We present the results from an Atacama Large Millimeter/submillimeter Array (ALMA) 1.3mm continuum and ^12^CO (J=2-1) line survey spread over 10deg^2^ in the Serpens...

The orbital-period (Porb) gap in the population of cataclysmic variables (CVs) informs the theoretical narrative of CV evolution, yet a complete understanding of the driving...