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JWST Photometry of Globular Clusters in A2744. II. Luminosity and Color Distributions
Harris, William E.; Reina-Campos, Marta
Deep JWST imaging of the giant galaxy cluster A2744, at redshift z = 0.308, is used to explore the features of its rich population of globular clusters (GCs), building on our initial survey of the system. We use the photometry of more than 10,000 GCs over a 3 mag range to construct the GC luminosity function and color distribution. These results n…
Surveys of clumps, cores, and condensations in Cygnus-X. SMA observations of SiO (5−4)
Qiu, Keping; Yang, Kai; Pan, Xing
Context. The SiO emissions are usually used to trace high-velocity outflow shocks in star-forming regions. However, several studies have found low-velocity and widespread SiO emissions not associated with outflows in molecular clouds.
Aims: We aim to detect and characterize the SiO emissions in massive dense cores (MDCs), and explore the prop…
Halfway to the Peak: The JWST MIRI 5.6 µm Number Counts and Source Population
Veilleux, Sylvain; Marchesini, Danilo; Alberts, Stacey +9 more
We present an analysis of eight JWST Mid-Infrared Instrument (MIRI) 5.6 µm images with 5σ depths of ≈0.1 µJy. We detect 2854 sources within our combined area of 18.4 arcmin2. We compute the MIRI 5.6 µm number counts, including an analysis of the field-to-field variation. Compared to earlier published MIRI 5.6 µm …
How Small-scale Jetlike Solar Events from Miniature Flux Rope Eruptions Might Produce the Solar Wind
Panesar, Navdeep K.; Moore, Ronald L.; Sterling, Alphonse C.
We consider small-scale jetlike events that might make the solar wind, as has been suggested in recent studies. We show that the events referred to as "coronal jets" and as "jetlets" both fall on a power-law distribution that also includes large-scale eruptions and spicule-sized features; all of the jetlike events could contribute to the solar win…
Evidence for enhanced star formation rates in z ∼ 0.35 cluster galaxies undergoing ram pressure stripping
Richard, Johan; Fritz, Jacopo; Vulcani, Benedetta +6 more
Ram-pressure stripping (RPS) is the mechanism most often invoked to explain the observed differences between cluster and field galaxies. In the local Universe, its effect on the star-forming properties of the galaxies has been largely elucidated and the general consensus is that this process first compresses the gas available in galaxy disks, boos…
CO emission survey of asymptotic giant branch stars with ultraviolet excesses
Sahai, R.; Sánchez Contreras, C.; Alonso-Hernández, J.
Context. The transition from the spherically symmetric envelopes around asymptotic giant branch (AGB) stars to the asymmetric morphologies observed in planetary nebulae is still not well understood, and the shaping mechanisms are a subject of debate. Even though binarity is widely accepted as a promising option, it is limited by the complication o…
3D non-local thermodynamic equilibrium magnesium abundances reveal a distinct halo population
Carlos, M.; Amarsi, A. M.; Nissen, P. E. +1 more
Magnesium is one of the most important elements in stellar physics as an electron donor; in Galactic archaeology, magnesium serves to distinguish different stellar populations. However, previous studies of Mg I and Mg II lines in metal-poor benchmark stars indicate that magnesium abundances inferred from one-dimensional (1D), hydrostatic models of…
The Remarkable X-Ray Spectra and Variability of the Ultraluminous Weak-line Quasar SDSS J1521+5202
Brandt, W. N.; Yu, Zhibo; Zou, Fan +5 more
We present a focused X-ray and multiwavelength study of the ultraluminous weak-line quasar (WLQ) SDSS J1521+5202, one of the few X-ray weak WLQs that is amenable to basic X-ray spectral and variability investigations. J1521+5202 shows striking X-ray variability during 2006–2023, by up to a factor of ≈32 in 0.5–2 keV flux, and our new 2023 Chandra …
Observing the galactic underworld: predicting photometry and astrometry from compact remnant microlensing events
Mérand, Antoine; Tuthill, Peter; Krone-Martins, Alberto +3 more
Isolated black holes (BHs) and neutron stars (NSs) are largely undetectable across the electromagnetic spectrum. For this reason, our only real prospect of observing these isolated compact remnants is via microlensing; a feat recently performed for the first time. However, characterization of the microlensing events caused by BHs and NSs is still …
Gas, not dust: Migration of TESS/Gaia hot Jupiters possibly halted by the magnetospheres of protoplanetary disks
Montesinos, B.; Mendigutía, I.; Huélamo, N. +4 more
Context. The presence of short-period (< 10 days) planets around main sequence (MS) stars has been associated either with the dust-destruction region or with the magnetospheric gas-truncation radius in the protoplanetary disks that surround them during the pre-MS phase. However, previous analyses have only considered low-mass FGK stars, making …