Search Publications
ALMA Lensing Cluster Survey: Bright [C II] 158 µm Lines from a Multiply Imaged Sub-L⋆ Galaxy at z = 6.0719
Ono, Yoshiaki; Ouchi, Masami; Richard, Johan +31 more
We present bright [C II] 158 µm line detections from a strongly magnified and multiply imaged (µ ∼ 20-160) sub-L* ( ${M}_{\mathrm{UV}}=-{19.75}_{-0.44}^{+0.55}$ ) Lyman-break galaxy (LBG) at z = 6.0719 ± 0.0004, drawn from the ALMA Lensing Cluster Survey (ALCS). Emission lines are identified at 268.7 GHz at ≥8σ exactly at th…
The Per-Tau Shell: A Giant Star-forming Spherical Shell Revealed by 3D Dust Observations
Alves, João; Zucker, Catherine; Goodman, Alyssa +6 more
A major question in the field of star formation is how molecular clouds form out of the diffuse interstellar medium (ISM). Recent advances in 3D dust mapping are revolutionizing our view of the structure of the ISM. Using the highest-resolution 3D dust map to date, we explore the structure of a nearby star-forming region, which includes the well-k…
Most lithium-rich low-mass evolved stars revealed as red clump stars by asteroseismology and spectroscopy
Zhao, Gang; Zhao, Jing-Kun; Li, Yaguang +19 more
Lithium has confused scientists for decades at almost every scale of the universe. Lithium-rich giants are peculiar stars with lithium abundances greater than model prediction. A large fraction of lithium-rich low-mass evolved stars are traditionally supposed to be red giant branch (RGB) stars. Recent studies, however, report that red clump (RC) s…
The VANDELS survey: The relation between the UV continuum slope and stellar metallicity in star-forming galaxies at z ∼ 3
Cimatti, A.; Schaerer, D.; Franco, M. +23 more
The estimate of stellar metallicities (Z*) of high-z galaxies are of paramount importance in order to understand the complexity of dust effects and the reciprocal interrelations among stellar mass, dust attenuation, stellar age, and metallicity. Benefiting from uniquely deep far-UV spectra of > 500 star-forming galaxies at redshifts …
Eridanus II: A Fossil from Reionization with an Off-center Star Cluster
Brown, Thomas M.; Strader, Jay; Geha, Marla +10 more
We present deep Hubble Space Telescope (HST) photometry of the ultra-faint dwarf galaxy Eridanus II (Eri II). Eri II, which has an absolute magnitude of MV = -7.1, is located at a distance of 339 kpc, just beyond the virial radius of the Milky Way. We determine the star formation history of Eri II and measure the structure of the galaxy…
Correction to: X-Ray Properties of TDEs
Komossa, S.; Jonker, P. G.; Auchettl, K. +1 more
Observational astronomy of tidal disruption events (TDEs) began with the detection of X-ray flares from quiescent galaxies during the ROSAT all-sky survey of 1990-1991. The flares complied with theoretical expectations, having high peak luminosities (Lx up to ≥4 ×1044 erg/s), a thermal spectrum with k T ∼few ×105 K…
The ALPINE-ALMA [CII] survey. The contribution of major mergers to the galaxy mass assembly at z ∼ 5
Cimatti, A.; Rodighiero, G.; Schaerer, D. +25 more
Context. Galaxy mergers are thought to be one of the main mechanisms of the mass assembly of galaxies in the Universe, but there is still little direct observational evidence of how frequent they are at z ≳ 4. Recently, many works have suggested a possible increase in the fraction of major mergers in the early Universe, reviving the debate on whic…
The search for failed supernovae with the Large Binocular Telescope: N6946-BH1, still no star
Kochanek, C. S.; Stanek, K. Z.; Dai, X. +2 more
We present new Large Binocular Telescope, Hubble Space Telescope, and Spitzer Space Telescope data for the failed supernova candidate N6946-BH1. We also report an unsuccessful attempt to detect the candidate with Chandra. The ~300 000 $\, \mathrm{L}_\odot$ red supergiant progenitor underwent an outburst in 2009 and has since disappeared in the opt…
An unusually low density ultra-short period super-Earth and three mini-Neptunes around the old star TOI-561
Scandariato, G.; Pagano, I.; Winn, J. N. +38 more
Based on HARPS-N radial velocities (RVs) and TESS photometry, we present a full characterization of the planetary system orbiting the late G dwarf TOI-561. After the identification of three transiting candidates by TESS, we discovered two additional external planets from RV analysis. RVs cannot confirm the outer TESS transiting candidate, which wo…
Gaia Early Data Release 3. Modelling and calibration of Gaia's point and line spread functions
Mora, A.; Evans, D. W.; Brown, A. G. A. +18 more
Context. The unprecedented astrometric precision of the Gaia mission relies on accurate estimates of the locations of sources in the Gaia data stream. This is ultimately performed by point spread function (PSF) fitting, which in turn requires an accurate reconstruction of the PSF, including calibrations of all the major dependences. These include …