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The Luminosity Function of Bright QSOs at z ∼ 4 and Implications for the Cosmic Ionizing Background
Grazian, Andrea; Boutsia, Konstantina; Cupani, Guido +8 more
Based on results by recent surveys, the number of bright quasars at redshifts z > 3 is being constantly revised upward. The current consensus is that at bright magnitudes (M1450 ≤ -27) the number densities of such sources could have been underestimated by a factor of 30%-40%. In the framework of the QUBRICS survey, we identified 58 b…
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…
ZTFJ0038+2030: A Long-period Eclipsing White Dwarf and a Substellar Companion
Kulkarni, S. R.; Bell, Keaton J.; Riddle, Reed +12 more
In a search for eclipsing white dwarfs using the Zwicky Transient Facility lightcurves, we identified a deep eclipsing white dwarf with an orbital period of 10.4 hr and an undetected substellar companion. We obtained high-speed photometry and radial velocity measurements to characterize the system. The white dwarf has a mass of 0.50 ± 0.02 M⊙…
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…
Infrared Excesses Around Bright White Dwarfs from Gaia and unWISE. II
Lai, Samuel; Rebassa-Mansergas, Alberto; Xu, Siyi +7 more
Infrared excesses around white dwarf stars indicate the presence of various astrophysical objects of interest, including companions and debris disks. In this second paper of a series, we present follow-up observations of infrared excess candidates from Gaia and unWISE discussed in the first paper, Paper I. We report space-based infrared photometry…
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) …
CO observations of the molecular gas in the Galactic H II region Sh2-48: Evidence for cloud-cloud collision as a trigger of high-mass star formation
Kuno, Nario; Tachihara, Kengo; Fukui, Yasuo +15 more
Sh2-48 is a Galactic H II region, 3.8 kpc distant, with an O9.5-type star identified at its center. As a part of the FOREST Unbiased Galactic plane Imaging survey using the Nobeyama 45 m telescope (FUGIN) project, we obtained a CO J = 1-0 data set for a large area of Sh2-48 at a spatial resolution of 21″ (∼0.4 pc), and used it to find a molecular …
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…
Physics of ULIRGs with MUSE and ALMA: The PUMA project. I. Properties of the survey and first MUSE data results
Maiolino, R.; Colina, L.; Perna, M. +8 more
Context. Ultraluminous infrared galaxies (ULIRGs) are characterised by extreme starburst (SB) and active galactic nucleus (AGN) activity, and are therefore ideal laboratories for studying the outflow phenomena and their feedback effects. We have recently started a project called Physics of ULIRGs with MUSE and ALMA (PUMA), which is a survey of 25 …