Search Publications
Period-age-metallicity and period-age-colour-metallicity relations for classical Cepheids: an application to the Gaia EDR3 sample
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +5 more
Based on updated pulsation models for classical Cepheids, computed for various assumptions about the metallicity and helium abundance, roughly representative of pulsators in the Small Magellanic Cloud (Z = 0.004 and Y = 0.25), Large Magellanic Cloud (Z = 0.008 and Y = 0.25), and M31 (Z = 0.03 and Y = 0.28), and self-consistent updated evolutionary…
The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves
Guterman, P.; Alonso, R.; Deleuil, M. +93 more
The accuracy of theoretical mass, radius, and effective temperature values for M-dwarf stars is an active topic of debate. Differences between observed and theoretical values have raised the possibility that current theoretical stellar structure and evolution models are inaccurate towards the low-mass end of the main sequence. To explore this issu…
Compact, bulge-dominated structures of spectroscopically confirmed quiescent galaxies at z ≈ 3
Daddi, Emanuele; Renzini, Alvio; Onodera, Masato +8 more
We study structural properties of spectroscopically confirmed massive quiescent galaxies at z ≈ 3 with one of the first sizeable samples of such sources, made of ten 10.8 < log (M⋆/M⊙) < 11.3 galaxies at 2.4 < z < 3.2 in the COSMOS field whose redshifts and quiescence are confirmed by Hubble Space Telescope (HST) …
NuSTAR measurement of the cosmic X-ray background in the 3-20 keV energy band
Krivonos, Roman; Sazonov, Sergey; Zoglauer, Andreas +5 more
We present measurements of the intensity of the cosmic X-ray background (CXB) with the Nuclear Spectroscopic Telescope Array (NuSTAR) telescope in the 3-20 keV energy range. Our method uses spatial modulation of the CXB signal on the NuSTAR detectors through the telescope's side aperture. Based on the NuSTAR observations of selected extragalactic …
Dynamical confirmation of a stellar mass black hole in the transient X-ray dipping binary MAXI J1305-704
Rau, A.; Mata Sánchez, D.; Torres, M. A. P. +3 more
MAXI J1305-704 has been proposed as a high-inclination candidate black hole X-ray binary in view of its X-ray properties and dipping behaviour during outburst. We present photometric and spectroscopic observations of the source in quiescence that allow us to reveal the ellipsoidal modulation of the companion star and absorption features consistent…
Measuring the vertical response of the Galactic disc to an infalling satellite
Laporte, Chervin F. P.; Drimmel, Ronald; Johnston, Kathryn V. +3 more
Using N-body simulations of the Milky Way interacting with a satellite similar to the Sagittarius dwarf galaxy, we quantitatively analyse the vertical response of the Galactic disc to the satellite's repeated impacts. We approximate the vertical distortion of the Galactic disc as the sum of the first three Fourier azimuthal terms m = 0, 1, and 2, …
Homogeneous analysis of globular clusters from the APOGEE survey with the BACCHUS code - III. ω Cen
Brownstein, Joel R.; Cunha, Katia; Smith, Verne V. +18 more
We study the multiple populations of ω Cen by using the abundances of Fe, C, N, O, Mg, Al, Si, K, Ca, and Ce from the high-resolution, high signal-to-noise (S/N > 70) spectra of 982 red giant stars observed by the SDSS-IV/APOGEE-2 survey. We find that the shape of the Al-Mg and N-C anticorrelations changes as a function of metallicity, continuo…
The dynamics of the globular cluster NGC 3201 out to the Jacobi radius
Lewis, Geraint F.; de Boer, Thomas; Mackey, Dougal +7 more
As part of a chemodynamical survey of five nearby globular clusters with 2dF/AAOmega on the Anglo-Australian Telescope (AAT), we have obtained kinematic information for the globular cluster NGC 3201. Our new observations confirm the presence of a significant velocity gradient across the cluster which can almost entirely be explained by the high pr…
ALMA Lensing Cluster Survey: a strongly lensed multiply imaged dusty system at z ≥ 6
Wang, T.; Laporte, N.; Bauer, F. E. +20 more
We report the discovery of an intrinsically faint, quintuply-imaged, dusty galaxy MACS0600-z6 at a redshift z = 6.07 viewed through the cluster MACSJ0600.1-2008 (z = 0.46). A ≃ 4σ dust detection is seen at 1.2mm as part of the ALMA Lensing Cluster Survey (ALCS), an on-going ALMA Large programme, and the redshift is secured via [C II] 158 µm …
The VMC survey - XLI. Stellar proper motions within the Small Magellanic Cloud
Sun, Ning-Chen; de Grijs, Richard; Ripepi, Vincenzo +13 more
We used data from the near-infrared Visible and Infrared Telescope for Astronomy (VISTA) survey of the Magellanic Cloud system (VMC) to measure proper motions (PMs) of stars within the Small Magellanic Cloud (SMC). The data analysed in this study comprise 26 VMC tiles, covering a total contiguous area on the sky of ∼40 deg2. Using multi…