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JWST/NIRCam Imaging of Young Stellar Objects. III. Detailed Imaging of the Nebular Environment around the HL Tau Disk
Dong, Ruobing; Wolff, Schuyler G.; Johnstone, Doug +13 more
As part of the James Webb Space Telescope (JWST) Guaranteed Time Observation program "Direct Imaging of YSOs" (program ID 1179), we use JWST NIRCam's direct imaging mode in F187N, F200W, F405N, and F410M to perform high-contrast observations of the circumstellar structures surrounding the protostar HL Tau. The data reveal the known stellar envelop…
An optimal ALMA image of the Hubble Ultra Deep Field in the era of JWST: obscured star formation and the cosmic far-infrared background
Hill, Ryley; Dunlop, James S.; Scott, Douglas +3 more
We combine archival ALMA data targeting the Hubble Ultra Deep Field (HUDF) to produce the deepest currently attainable 1-mm maps of this key region. Our deepest map covers 4.2 arcmin2, with a beamsize of 1.49 arcsec $\, {\times }\, 1.07\,$ arcsec at an effective frequency of 243 GHz (1.23 mm). It reaches an rms of 4.6 µJy beam$^{-…
Quasar 3C 47: Extreme Population B jetted source with double-peaked profiles
Pović, Mirjana; Marziani, Paola; Deconto Machado, Alice +3 more
Context. An optically thick, geometrically thin accretion disk (AD) around a supermassive black hole might contribute to broad-line emission in type 1 active galactic nuclei (AGN). However, the emission line profiles are most often not immediately consistent with the profiles expected from a rotating disk. The extent to which an AD in AGN contribu…
Asteroseismology of the Nearby K Dwarf σ Draconis Using the Keck Planet Finder and TESS
Knutson, Heather; Li, Yaguang; Lee, Chien-Hsiu +76 more
Asteroseismology of dwarf stars cooler than the Sun is very challenging owing to the low amplitudes and rapid timescales of oscillations. Here we present the asteroseismic detection of solar-like oscillations at 4-minute timescales (
Charting the Lyman-α escape fraction in the range 2.9 < z < 6.7 and consequences for the LAE reionisation contribution
Laporte, N.; Nanayakkara, T.; Pello, R. +5 more
Context. The escape of Lyman-α photons at redshifts greater than two is an ongoing subject of study and an important quantity to further understanding of Lyman-α emitters (LAEs), the transmission of Lyman-α photons through the interstellar medium and intergalactic medium, and the impact these LAEs have on cosmic reionisation. Aims. This study aims…
Differential reddening in 48 globular clusters: An end to the quest for the intracluster medium
Bianchi, S.; Hunt, L. K.; Rainer, M. +9 more
For decades, it has been theorized that a tenuous but detectable intracluster medium should be present in globular clusters, which is continuously replenished by the gas and dust ejected by bright giants and periodically cleared by interactions with the Galactic disk. However, dedicated searches, especially in infrared and radio wavelengths, have …
Sky location of Galactic white dwarf binaries in space-based gravitational wave detection
Guo, Pan; Jin, Hong-Bo; Qiao, Cong-Feng +1 more
Quickly localizing the identified white dwarf (WD) binaries is the basic requirement for the space-based gravitational wave (GW) detection. In fact, the amplitude of GW signals are modulated by the periodic motion of GW detectors on the solar orbit. The intensity of the observed signals is enhanced according to the observation time beyond a year t…
The Metallicities of Five Small High-velocity Clouds
Richter, Philipp; Lockman, Felix J.; Fox, Andrew J. +5 more
High-velocity clouds (HVCs) are multiphase gas structures whose velocities (∣v LSR∣ ≥ 100 km s-1) are too high to be explained by Galactic disk rotation. While large HVCs are well characterized, compact and small HVCs (with H I angular sizes of a few degrees) are poorly understood. Possible origins for such small clouds inclu…
Modeling the spectral energy distribution of starburst galaxies. The role of photodissociation regions
Buat, V.; Boquien, M.; Burgarella, D. +3 more
Context. Analyzing multiwavelength observations of galaxies from the far-ultraviolet to the millimeter domains provides a wealth of information on the physical properties of galaxies and their evolution across cosmic time. Existing or upcoming ground-based or space-borne facilities with enhanced sensitivities and resolutions open an unprecedented …
Molecular clouds as hubs in spiral galaxies: gas inflow and evolutionary sequence
Davis, Timothy A.; Dib, Sami; Zhou, J. W.
We decomposed the molecular gas in the spiral galaxy NGC 628 (M74) into multiscale hub-filament structures using the CO (2