Search Publications
Dynamical masses and mass-to-light ratios of resolved massive star clusters - II. Results for 26 star clusters in the Magellanic Clouds
Mateo, Mario; Reiter, Megan; Roederer, Ian U. +5 more
We present spectroscopy of individual stars in 26 Magellanic Cloud (MC) star clusters with the aim of estimating dynamical masses and V-band mass-to-light (M/LV) ratios over a wide range in age and metallicity. We obtained 3137 high-resolution stellar spectra with M2FS on the Magellan/Clay Telescope. Combined with 239 published spectros…
SERENA: Particle Instrument Suite for Determining the Sun-Mercury Interaction from BepiColombo
Kallio, E.; Schmidt, W.; Barabash, S. +118 more
The ESA-JAXA BepiColombo mission to Mercury will provide simultaneous measurements from two spacecraft, offering an unprecedented opportunity to investigate magnetospheric and exospheric particle dynamics at Mercury as well as their interactions with solar wind, solar radiation, and interplanetary dust. The particle instrument suite SERENA (Search…
The ALMA Survey of 70 µm Dark High-mass Clumps in Early Stages (ASHES). IV. Star Formation Signatures in G023.477
Jackson, James M.; Sanhueza, Patricio; Lu, Xing +15 more
With a mass of ~1000 M ⊙ and a surface density of ~0.5 g cm-2, G023.477+0.114, also known as IRDC 18310-4, is an infrared dark cloud (IRDC) that has the potential to form high-mass stars and has been recognized as a promising prestellar clump candidate. To characterize the early stages of high-mass star formation, we have obs…
Constraints on warm dark matter from UV luminosity functions of high-z galaxies with Bayesian model comparison
Rudakovskyi, Anton; Mesinger, Andrei; Savchenko, Denys +1 more
The number density of small dark matter (DM) haloes hosting faint high-redshift galaxies is sensitive to the DM free-streaming properties. However, constraining these DM properties is complicated by degeneracies with the uncertain baryonic physics governing star formation. In this work, we use a flexible astrophysical model and a Bayesian inferenc…
The ZTF Source Classification Project. I. Methods and Infrastructure
Kulkarni, S. R.; Duev, Dmitry A.; Riddle, Reed +22 more
The Zwicky Transient Facility (ZTF) has been observing the entire northern sky since the start of 2018 down to a magnitude of 20.5 (5σ for 30 s exposure) in the g, r, and i filters. Over the course of two years, ZTF has obtained light curves of more than a billion sources, each with 50-1000 epochs per light curve in g and r, and fewer in i. To be …
Mass segregation and sequential star formation in NGC 2264 revealed by Herschel
Cunningham, N.; Lumsden, S. L.; Schneider, N. +16 more
Context. The mass segregation of stellar clusters could be primordial rather than dynamical. Despite the abundance of studies of mass segregation for stellar clusters, those for stellar progenitors are still scarce, so the question concerning the origin and evolution of mass segregation is still open.
Aims: Our goal is to characterize the str…
Close-up view of a luminous star-forming galaxy at z = 2.95
Berta, S.; Ivison, R. J.; Omont, A. +35 more
Exploiting the sensitivity of the IRAM NOrthern Extended Millimeter Array (NOEMA) and its ability to process large instantaneous bandwidths, we have studied the morphology and other properties of the molecular gas and dust in the star forming galaxy, H-ATLAS J131611.5+281219 (HerBS-89a), at z = 2.95. High angular resolution (0.″3) image…
The Red Supergiant Binary Fraction as a Function of Metallicity in M31 and M33
Neugent, Kathryn F.
Recent work measuring the binary fraction of evolved red supergiants (RSGs) in the Magellanic Clouds points to a value between 15% and 30%, with the majority of the companions being unevolved B-type stars as dictated by stellar evolution. Here I extend this research to the Local Group galaxies M31 and M33 and investigate the RSG binary fraction as…
Bottlenecks to interstellar sulfur chemistry. Sulfur-bearing hydrides in UV-illuminated gas and grains
Goicoechea, J. R.; Riquelme, D.; Fuente, A. +8 more
Hydride molecules lie at the base of interstellar chemistry, but the synthesis of sulfuretted hydrides is poorly understood and their abundances often crudely constrained. Motivated by new observations of the Orion Bar photodissociation region (PDR) - 1″ resolution ALMA images of SH+; IRAM 30 m detections of bright H232<…
The Age of Westerlund 1 Revisited
Smith, Nathan; Gehrz, Robert D.; Figer, Donald F. +2 more
The cluster Westerlund 1 (Wd1) is host to a large variety of post-main-sequence (MS) massive stars. The simultaneous presence of these stars can only be explained by stellar models if the cluster has a finely tuned age of 4-5 Myr, with several published studies independently claiming ages within this range. At this age, stellar models predict that…