Search Publications
The ALMA-ALPAKA survey. I. High-resolution CO and [CI] kinematics of star-forming galaxies at z = 0.5-3.5
Magdis, G. E.; Zanella, A.; Brammer, G. +13 more
Context. Spatially resolved studies of the kinematics of galaxies provide crucial insights into their assembly and evolution, enabling one to infer the properties of the dark matter halos, derive the impact of feedback on the interstellar medium (ISM), as well as measure and characterize the outflow motions. To date, most of the kinematic studies …
Gaia white dwarfs within 40 pc - III. Spectroscopic observations of new candidates in the Southern hemisphere
Hermes, J. J.; Gänsicke, B. T.; Jordan, S. +31 more
We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the Southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Telescope. Almost all candidates were selected from Gaia Data Release 3 (DR3). We find a total of 246 …
PHANGS-JWST First Results: Massive Young Star Clusters and New Insights from JWST Observations of NGC 1365
White, Richard L.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +28 more
A primary new capability of JWST is the ability to penetrate the dust in star-forming galaxies to identify and study the properties of young star clusters that remain embedded in dust and gas. In this Letter we combine new infrared images taken with JWST with our optical Hubble Space Telescope (HST) images of the starbursting barred (Seyfert2) spi…
Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes
Stangalini, Marco; Jess, David B.; Jafarzadeh, Shahin +3 more
Waves and oscillations have been observed in the Sun's atmosphere for over half a century. While such phenomena have readily been observed across the entire electromagnetic spectrum, spanning radio to gamma-ray sources, the underlying role of waves in the supply of energy to the outermost extremities of the Sun's corona has yet to be uncovered. Of…
Stellar Properties of Observed Stars Stripped in Binaries in the Magellanic Clouds
Smith, N.; Crowther, P. A.; de Mink, S. E. +6 more
Massive stars (~8-25 M ⊙) stripped of their hydrogen-rich envelopes via binary interaction are thought to be the main progenitors for merging neutron stars and stripped-envelope supernovae. We recently presented the discovery of the first set of such stripped stars in a companion paper. Here, we fit the spectra of 10 stars with new atmo…
Internal kinematics of Gaia DR3 wide binaries: anomalous behaviour in the low acceleration regime
Hernandez, X.
The Gaia eDR3 catalogue has recently been used to study statistically the internal kinematics of wide binary populations using relative velocities of the two component stars, ΔV, total binary masses, mB, and separations, s. For s ≳ 0.01 pc, these binaries probe the low-acceleration a ≲ 2a0 regime where gravitational anomalies…
Empirical Temperature- and Extinction-dependent Extinction Coefficients for the GALEX, Pan-STARRS 1, Gaia, SDSS, 2MASS, and WISE Passbands
Yuan, Haibo; Zhang, Ruoyi
We have obtained accurate dust reddening from the far-ultraviolet to the mid-infrared for up to 5 million stars by the star-pair algorithm based on LAMOST stellar parameters along with Galaxy Evolution Explorer, Pan-STARRS 1, Gaia, Sloan Digital Sky Survey, Two Micron All Sky Survey, and Wide-field Infrared Survey Explorer photometric data. The ty…
The Puzzling Properties of the MACS1149-JD1 Galaxy at z = 9.11
Stiavelli, Massimo; Treu, Tommaso; Trenti, Michele +6 more
We analyze new JWST NIRCam and NIRSpec data on the redshift 9.11 galaxy MACS1149-JD1 (hereafter JD1). Our NIRCam imaging data reveal that JD1 comprises three spatially distinct components. Our spectroscopic data indicate that JD1 appears dust free but is already enriched, $12+\mathrm{log}({\rm{O}}/{\rm{H}})={7.90}_{-0.05}^{+0.04}$ . We also find t…
Using [Ne V]/[Ne III] to Understand the Nature of Extreme-ionization Galaxies
Papovich, Casey; Finkelstein, Steven L.; Cleri, Nikko J. +14 more
Spectroscopic studies of extreme-ionization galaxies (EIGs) are critical to our understanding of exotic systems throughout cosmic time. These EIGs exhibit spectral features requiring >54.42 eV photons: the energy needed to ionize helium into He2+ fully and emit He II recombination lines. Spectroscopic studies of EIGs can probe exotic…
The hidden side of cosmic star formation at z > 3. Bridging optically dark and Lyman-break galaxies with GOODS-ALMA
Magnelli, B.; Daddi, E.; Elbaz, D. +37 more
Our current understanding of the cosmic star formation history at z > 3 is primarily based on UV-selected galaxies (Lyman-break galaxies, i.e., LBGs). Recent studies of H-dropouts (HST-dark galaxies) have revealed that we may be missing a large proportion of star formation that is taking place in massive galaxies at z > 3. In this work, we e…