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A study of extreme C III]1908 & [O III]88/[C II]157 emission in Pox 186: implications for JWST+ALMA (FUV + FIR) studies of distant galaxies
Kumari, Nimisha; Aloisi, Alessandra; Leitherer, Claus +4 more
Carbon spectral features are ubiquitous in the ultraviolet (UV) and far-infrared (FIR) spectra of the reionization-era galaxies. We probe the ionized carbon content of a dwarf galaxy Pox 186 using the UV, optical, mid-infrared, and FIR data taken with Hubble, Gemini, Spitzer, and Herschel, respectively. This local (z ~ 0.0040705) galaxy is likely …
ALMA 2D super-resolution imaging of Taurus-Auriga protoplanetary disks: Probing statistical properties of disk substructures
Tamura, Motohide; Yamaguchi, Masayuki; Nomura, Hideko +6 more
In the past decade, ALMA observations of protoplanetary disks revealed various substructures including gaps and rings. Their origin of substructures may be probed through statistical studies of their physical properties. We present the analyses of archival ALMA Band 6 continuum data of 43 disks (39 Class II and four Herbig Ae) in the Taurus-Auriga…
Revisiting the membership, multiplicity, and age of the Beta Pictoris Moving Group in the Gaia era
van Saders, Jennifer; Gaidos, Eric; Gagné, Jonathan +2 more
Determining the precise ages of young (tens to a few hundred Myr) kinematic ('moving') groups is important for placing star, protoplanetary disc, and planet observations on an evolutionary timeline. The nearby ~25 Myr-old β Pictoris Moving Group (BPMG) is an important benchmark for studying stars and planetary systems at the end of the primordial …
Dust and power: Unravelling the merger-active galactic nucleus connection in the second half of cosmic history
Wang, L.; Davé, R.; Yang, G. +8 more
Aims. Galaxy mergers represent a fundamental physical process under hierarchical structure formation, but their role in triggering active galactic nuclei (AGNs) is still unclear. We aim to investigate the merger-AGN connection using state-of-the-art observations and novel methods for detecting mergers and AGNs. Methods. We selected stellar mass-li…
Radial phase spirals in the Solar neighbourhood
Price-Whelan, Adrian M.; Horta, Danny; Johnston, Kathryn V. +4 more
The second data release of ESA's Gaia mission revealed numerous signatures of disequilibrium in the Milky Way's disc. These signatures are seen in the planar kinematics of stars, which manifest as ridges and ripples in R-vϕ, and in vertical kinematics, where a prominent spiral is seen in the z-vz phase space. In this work, we…
JWST and ALMA Discern the Assembly of Structural and Obscured Components in a High-redshift Starburst Galaxy
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Koekemoer, Anton M. +27 more
We present observations and analysis of the starburst PACS-819 at z = 1.45 (M * = 1010.7 M ⊙), using high-resolution (0.″1; 0.8 kpc) Atacama Large Millimeter/submillimeter Array (ALMA) and multiwavelength JWST images from the COSMOS-Web program. Dissimilar to Hubble Space Telescope (HST) ACS images in the rest-fram…
Broadband X-ray/UV/optical time-resolved spectroscopy of NGC 5548: The origin of the UV/optical variability in active galactic nuclei
Papadakis, I. E.; Dovčiak, M.; Kammoun, E. +1 more
Context. Recently, nearby bright galaxies have been the subject of long monitoring surveys in the X-rays, UV, and optical. All of these campaigns revealed a strong correlation between the various UV and optical bands, with time lags that increase with wavelength. In a series of papers, we have demonstrated that a scenario in which an X-ray source …
Investigating episodic mass loss in evolved massive stars. I. Spectroscopy of dusty massive stars in ten southern galaxies
Zapartas, E.; de Wit, S.; Bonanos, A. Z. +7 more
Context. Episodic mass-loss events such as giant eruptions in luminous blue variables or pre-supernova eruptions in red supergiants drastically alter the evolutionary path of a massive star, resulting in a rich and complex circumstellar environment and IR excess. However, the incidence of these events, and hence their importance in massive star ev…
SMA 200–400 GHz Survey for Dust Properties in the Icy Class II Disks in the Taurus Molecular Cloud
Liu, Hauyu Baobab; Andrews, Sean M.; Long, Feng +4 more
We present a new Submillimeter Array survey of 47 Class II sources in the Taurus–Auriga region. Our observations made 12 independent samples of flux densities over the 200–400 GHz frequency range. We tightly constrained the spectral indices of most sources to a narrow range of 2.0 ± 0.2; only a handful of spatially resolved (e.g., diameter >250…
Discovery of a new blue large-amplitude pulsator in the SkyMapper DR2: SMSS J184506.82-300804.7
Wolf, Christian; Onken, Christopher A.; Bessell, Michael S. +1 more
We report the discovery of a new Blue Large-Amplitude Pulsator (BLAP), SMSS J184506-300804 (SMSS-BLAP-1) in Data Release 2 of the SkyMapper Southern Sky Survey. We conduct high-cadence photometric observations in the u band to confirm a periodic modulation of the light curve. SMSS-BLAP-1 has a ~19-min pulsation period with an amplitude of 0.2 mag …