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An updated maximum likelihood approach to open cluster distance determination
Luri, X.; Arenou, F.; Masana, E. +1 more
Aims: An improved method for estimating distances to open clusters is presented and applied to Hipparcos data for the Pleiades and the Hyades. The method is applied in the context of the historic Pleiades distance problem, with a discussion of previous criticisms of Hipparcos parallaxes. This is followed by an outlook for Gaia, where the impr…
The occurrence of upstream waves in relation with the solar wind parameters: A statistical approach to estimate the size of the foreshock region
Regi, M.; De Lauretis, M.; Francia, P.
We studied the occurrence of upstream waves in the foreshock region and their relationship with the solar wind and interplanetary magnetic field parameters. To this purpose, we developed a method for a careful identification of the upstream wave events. The results of the statistical analyses based on Cluster data (2003-2010 years) confirm that th…
Distinguishing between inflationary models from cosmic microwave background
Tsujikawa, Shinji
In this paper, inflationary cosmology is reviewed, paying particular attention to its observational signatures associated with large-scale density perturbations generated from quantum fluctuations. In the most general scalar-tensor theories with second-order equations of motion, we derive the scalar spectral index n_s, the tensor-to-scalar ratio r…
Non-Gaussianity of the cosmic infrared background anisotropies - II. Predictions of the bispectrum and constraints forecast
Aghanim, N.; Lacasa, F.; Pénin, A.
Using a full analytical computation of the bispectrum based on the halo model together with the halo occupation number, we derive the bispectrum of the cosmic infrared background (CIB) anisotropies that trace the clustering of dusty-star-forming galaxies. We focus our analysis on wavelengths in the far-infrared and the sub-millimeter typical of th…
Orbits of four visual binaries determined from observations along short arcs
Kiselev, A. A.; Romanenko, L. G.
The orbits of the four visual binaries ADS 246 (GL 15), ADS 7724 ( γ Leo), ADS 10386 (GJ 659), and ADS 14909 (1 Peg) have been determined using the apparent motion parameters (AMP) method. The orbital periods of these stars are 1200, 550, 7500, and 18 000 yr, respectively. The orbits were calculated based on observations along short arcs obtained …
Nature versus Nurture: Luminous Blue Variable Nebulae in and near Massive Stellar Clusters at the Galactic Center
Morris, M. R.; Lau, R. M.; Herter, T. L. +1 more
Three luminous blue variables (LBVs) are located in and near the Quintuplet Cluster at the Galactic center: the Pistol Star, G0.120-0.048, and qF362. We present imaging at 19, 25, 31, and 37 µm of the region containing these three LBVs, obtained with SOFIA using FORCAST. We argue that Pistol and G0.120-0.048 are identical "twins" that exhibi…
Molecular gas properties of UV-bright star-forming galaxies at low redshift
Basu-Zych, Antara; Overzier, Roderik A.; Martin, D. Christopher +2 more
Lyman break analogues (LBAs) are a population of star-forming galaxies at low redshift (z ∼ 0.2) selected in the ultraviolet (UV). These objects present higher star formation rates and lower dust extinction than other galaxies with similar masses and luminosities in the local universe. In this work, we present results from a survey with the Combin…
Probing neutrinos from Planck and forthcoming galaxy redshift surveys
Kadota, Kenji; Takeuchi, Yoshitaka
We investigate how much the constraints on the neutrino properties can be improved by combining the CMB, the photometric and spectroscopic galaxy redshift surveys which include the CMB lensing, galaxy lensing tomography, galaxy clustering and redshift space distortion observables. We pay a particular attention to the constraint on the neutrino mas…
How does pressure gravitate? Cosmological constant problem confronts observational cosmology
Afshordi, Niayesh; Scott, Douglas; Narimani, Ali
An important and long-standing puzzle in the history of modern physics is the gross inconsistency between theoretical expectations and cosmological observations of the vacuum energy density, by at least 60 orders of magnitude, otherwise known as the cosmological constant problem. A characteristic feature of vacuum energy is that it has a pressure …
The Herschel view of circumstellar discs: a multiwavelength study of Chamaeleon-I
Ray, Tom; Scholz, Alexander; Rodgers-Lee, Donna +1 more
We present the results of a multiwavelength study of circumstellar discs around 44 young stellar objects in the 3 myr old nearby Chamaeleon-I star-forming region. In particular, we explore the far-infrared/submm regime using Herschel fluxes. We show that Herschel fluxes at 160-500 µm can be used to derive robust estimates of the disc mass. T…