Search Publications
JWST study of the DG Tau B disk-wind candidate. I. Overview and nested H2-CO outflows
Podio, L.; Dougados, C.; Tabone, B. +5 more
Context. The origin of outflows and their impact on protoplanetary disk evolution and planet-formation processes are still crucial open questions. DG Tau B is a Class I protostar associated with a structured disk and a rotating conical CO outflow and was recently identified by ALMA as one of the best CO disk wind candidate. It is therefore a perfe…
O Corona, where art thou? eROSITA's view of UV-optical-IR variability-selected massive black holes in low-mass galaxies
Haberl, F.; Zezas, A.; Georgakakis, A. +16 more
Finding massive black holes (MBHs, MBH ≈ 104-107 M⊙) in the nuclei of low-mass galaxies ≤ft( {{M_*}\mathop {\mathop < \limits_ }\limits_ {{10}10}{M_ ȯ }} \right) is crucial to constrain seeding and growth of black holes over cosmic time, but it is particularly challenging due to their low a…
K2 results for "young" α-rich stars in the Galaxy
Valentini, M.; Chiappini, C.; Tailo, M. +11 more
Context. The origin of apparently young α-rich stars in the Galaxy is still a matter of debate in Galactic archaeology, whether they are genuinely young or might be products of binary evolution, and mergers or mass accretion.
Aims: Our aim is to shed light on the nature of young α-rich stars in the Milky Way by studying their distribution in …
MINDS: The DR Tau disk: II. Probing the hot and cold H2O reservoirs in the JWST-MIRI spectrum
Henning, Thomas; Güdel, Manuel; Tabone, Benoît +14 more
Context. The Medium Resolution Spectrometer (MRS) of the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST) gives insights into the chemical richness and complexity of the inner regions of planet-forming disks. Several disks that are compact in the millimetre dust emission have been found by Spitzer to be particularly bright i…
An absence of binary companions to Wolf-Rayet stars in the Small Magellanic Cloud: Implications for mass loss and black hole masses at low metallicities
Wang, C.; Shenar, T.; Sana, H. +6 more
To predict black hole mass distributions at high redshifts, we need to understand whether very massive single stars (M ≳ 40 M⊙) with low metallicities (Z) lose their hydrogen-rich envelopes, like their metal-rich counterparts, or whether a binary companion is required to achieve this. To test this, we undertook a deep spectroscopic sear…
Witnessing an extreme, highly efficient galaxy formation mode with resolved Lyman-α and Lyman-continuum emission
Chisholm, J.; Schaerer, D.; Marques-Chaves, R. +9 more
J1316+2614 at z = 3.613 is the UV-brightest (MUV = ‑24.7) and strongest Lyman continuum-emitting (fescLyC ≈ 90%) star-forming galaxy known; it also shows signatures of inflowing gas from its blue-dominated Lyα profile. We present high-resolution imaging with the Hubble Space Telescope (HST) and the Very Large Teles…
IXPE observation of PKS 2155–304 reveals the most highly polarized blazar
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +133 more
We report the X-ray polarization properties of the high-synchrotron-peaked (HSP) blazar PKS 2155‑304 based on observations with the Imaging X-ray Polarimetry Explorer (IXPE). We observed the source between Oct 27 and Nov 7, 2023. We also conducted an extensive contemporaneous multiwavelength (MW) campaign. We find that during the first half (T
CHEX-MATE: Robust reconstruction of temperature profiles in galaxy clusters with XMM-Newton
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +25 more
The "Cluster HEritage project with XMM-Newton: Mass Assembly and Thermodynamics at the End point of structure formation" (CHEX-MATE) is a multi-year heritage program to obtain homogeneous XMM-Newton observations of a representative sample of 118 galaxy clusters. The observations are tuned to reconstruct the distribution of the main thermodynamic q…
Complex angular structure of three elliptical galaxies from high-resolution ALMA observations of strong gravitational lenses
Vegetti, S.; McKean, J. P.; Fassnacht, C. D. +4 more
The large-scale mass distributions of galaxy-scale strong lenses have long been assumed to be well described by a singular ellipsoidal power-law density profile with external shear. However, the inflexibility of this model could lead to systematic errors in astrophysical parameters inferred with gravitational lensing observables. Here, we present …
Consistency of JWST black hole observations with NANOGrav gravitational wave measurements
Hütsi, Gert; Ellis, John; Fairbairn, Malcolm +3 more
JWST observations have opened a new chapter in supermassive black hole (SMBH) studies, stimulating discussion of two puzzles: the abundance of high-z SMBHs and the fraction of dual active galactic nuclei (AGNs). We argue that the answers to these puzzles may be linked to an interpretation of the data on the nanohertz gravitational waves (GWs) disc…