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Testing cosmic acceleration for w(z) parametrizations using fgas measurements in galaxy clusters
Foëx, G.; Motta, V.; Magaña, Juan +1 more
In this paper, we study the cosmic acceleration for five dynamical dark energy models whose equation of state varies with redshift. The cosmological parameters of these models are constrained by performing a Markov chain Monte Carlo (MCMC) analysis using mainly gas mass fraction, fgas, measurements in two samples of galaxy clusters: one…
Search for grain growth toward the center of L1544
Désert, F. -X.; Spaans, M.; Caselli, P. +4 more
In dense and cold molecular clouds dust grains are surrounded by thick icy mantles. It is not clear, however, if dust growth and coagulation take place before the protostar switches on. This is an important issue as the presence of large grains may affect the chemical structure of dense cloud cores, including the dynamically important ionization f…
The footprint of cometary dust analogues - I. Laboratory experiments of low-velocity impacts and comparison with Rosetta data
Blum, J.; Gundlach, B.; Dominik, C. +8 more
Cometary dust provides a unique window on dust growth mechanisms during the onset of planet formation. Measurements by the Rosetta spacecraft show that the dust in the coma of comet 67P/Churyumov-Gerasimenko has a granular structure at size scales from sub-µmup to several hundreds of µm, indicating hierarchical growth took place across…
A halo substructure in Gaia Data Release 1
Myeong, G. C.; Evans, N. W.; Belokurov, V. +2 more
We identify a halo substructure in the Tycho Gaia Astrometric Solution (TGAS) data set, cross-matched with the Radial Velocity Experiment (RAVE-on) data release. After quality cuts, the stars with large radial action (JR > 800 km s-1 kpc) are extracted. A subset of these stars is clustered in longitude and velocity and can…
An Estimation of the Star Formation Rate in the Perseus Complex
Myers, Philip C.; Sadavoy, Sarah I.; Lee, Katherine I. +1 more
We present the results of our investigation of the star-forming potential in the Perseus star-forming complex. We build on previous starless core, protostellar core, and young stellar object (YSO) catalogs from Spitzer (3.6-70 µm), Herschel (70-500 µm), and SCUBA (850 µm) observations in the literature. We place the cores and YSO…
Hot Molecular Gas in the Circumnuclear Disk
Togi, Aditya; Mills, Elisabeth A. C.; Kaufman, Michael
We present an analysis of archival Infrared Space Observatory observations of H2 for three 14\prime\prime × 20\prime\prime pointings in the central 3 pc of the Galaxy: toward the southwest region and northeast region of the Galactic center circumnuclear disk (CND), and toward the supermassive black hole Sgr A*. We …
[Ultra] luminous infrared galaxies selected at 90 µm in the AKARI deep field: a study of AGN types contributing to their infrared emission
Buat, V.; Małek, K.; Burgarella, D. +6 more
Aims: The aim of this work is to characterize physical properties of ultra luminous infrared galaxies (ULIRGs) and luminous infrared galaxies (LIRGs) detected in the far-infrared (FIR) 90 µm band in the AKARI Deep Field-South (ADF-S) survey. In particular, we want to estimate the active galactic nucleus (AGN) contribution to the LIRGs a…
A non-parametric consistency test of the ΛCDM model with Planck CMB data
Shafieloo, Arman; Aghamousa, Amir; Hamann, Jan
Non-parametric reconstruction methods, such as Gaussian process (GP) regression, provide a model-independent way of estimating an underlying function and its uncertainty from noisy data. We demonstrate how GP-reconstruction can be used as a consistency test between a given data set and a specific model by looking for structures in the residuals of…
A Multiwavelength Study of Nearby Millisecond Pulsar PSR J1400-1431: Improved Astrometry and an Optical Detection of Its Cool White Dwarf Companion
Ray, P. S.; Kaplan, D. L.; Lorimer, D. R. +16 more
In 2012, five high-school students involved in the Pulsar Search Collaboratory discovered the millisecond pulsar (MSP) PSR J1400-1431, and initial timing parameters were published in Rosen et al. a year later. Since then, we have obtained a phase-connected timing solution spanning five years, resolving a significant position discrepancy and measur…
High-latitude Pi2 pulsations associated with kink-like neutral sheet oscillations
Zhang, T. L.; Volwerk, M.; Wang, G. Q. +2 more
A kink-like neutral sheet oscillation event observed by Cluster between 1436 and 1445 UT on 15 October 2004 has been investigated. The oscillations with periods between 40 and 60 s, observed at (-13.1, 8.7, -0.5) RE, are dominant in BX and BY. And they propagate mainly duskward with a velocity of (86, 147, 46) km/s…