Search Publications
Hubble tension or a transition of the Cepheid SnIa calibrator parameters?
Perivolaropoulos, Leandros; Skara, Foteini
We reanalyze the Cepheid data used to infer the value of the Hubble constant H0 by calibrating type Ia supernovae. We do not enforce a universal value of the empirical Cepheid calibration parameters RW (Cepheid Wesenheit color-luminosity parameter) and MHW (Cepheid Wesenheit H-band absolute magnitude). I…
Constraining the baryon abundance with the kinematic Sunyaev-Zel'dovich effect: Projected-field detection using P l a n c k , W M A P , and u n W I S E
Ferraro, Simone; Hill, J. Colin; Kusiak, Aleksandra +2 more
The kinematic Sunyaev-Zel'dovich (kSZ) effect—the Doppler boosting of Cosmic Microwave Background (CMB) photons scattering off free electrons with nonzero line-of-sight velocity—is an excellent probe of the distribution of baryons in the Universe. In this paper, we measure the kSZ effect due to ionized gas traced by infrared-selected galaxies from…
Sum of the masses of the Milky Way and M31: A likelihood-free inference approach
Lahav, Ofer; Hoffman, Yehuda; Whiteway, Lorne +3 more
We use density estimation likelihood-free inference, Λ cold dark matter simulations of ∼2 M galaxy pairs, and data from Gaia and the Hubble Space Telescope to infer the sum of the masses of the Milky Way and Andromeda (M31) galaxies, the two main components of the local group. This method overcomes most of the approximations of the traditional tim…
Gravitational wave detection with photometric surveys
Doré, Olivier; Wang, Yijun; Pardo, Kris +1 more
Gravitational wave (GW) detections have considerably enriched our understanding of the universe. To date, all GW events from individual sources have been found by interferometer-type detectors. In this paper, we study a GW detection technique based on astrometric solutions from photometric surveys and demonstrate that it offers a highly flexible f…
Galactic bulge millisecond pulsars shining in x rays: A γ -ray perspective
Calore, Francesca; Petrucci, Pierre-Olivier; Clavel, Maïca +3 more
If the mysterious Fermi-LAT GeV γ -ray excess is due to an unresolved population of millisecond pulsars (MSP) in the Galactic bulge, one expects this very same population to shine in x rays. For the first time, we address the question of what is the sensitivity of current x-ray telescopes to an MSP population in the Galactic bulge. To this end, we…