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Scenarios for the dynamics of comet 67P/Churyumov-Gerasimenko over the past 500 kyr
Guzzo, Massimiliano; Lega, Elena
The complex dynamics of 67P has the typical uncertainties of the Jupiter-family comets. The Rosetta mission provided a unique opportunity to dissipate them with fresh experimental data. We aim to constrain the residence time of the comet in a dynamics dominated by Jupiter and Saturn by comparing statistics of large sets of numerical integrations w…
The cooling, mass and radius of the neutron star in EXO 0748-676 in quiescence with XMM-Newton
Costantini, Elisa; Méndez, Mariano; Cheng, Zheng +1 more
We analyse four XMM-Newton observations of the neutron-star low-mass X-ray binary EXO 0748-676 in quiescence. We fit the spectra with an absorbed neutron-star atmosphere model, without the need for a high-energy (power-law) component; with a 95 per cent confidence the power law contributes less than 1 per cent to the total flux of the source in 0.…
Mapping diffuse interstellar bands in the local ISM on small scales via MUSE 3D spectroscopy. A pilot study based on globular cluster NGC 6397
Richter, Philipp; Brinchmann, Jarle; Weilbacher, Peter M. +6 more
Context. We map the interstellar medium (ISM) including the diffuse interstellar bands (DIBs) in absorption toward the globular cluster NGC 6397 using VLT/MUSE. Assuming the absorbers are located at the rim of the Local Bubble we trace structures on the order of mpc (milliparsec, a few thousand AU).
Aims: We aimed to demonstrate the feasibili…
Adaptive PSF fitting - a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects
Surdej, J.; Nuritdinov, S. N.; Elyiv, A. +12 more
We present new photometric observations of H1413+117 acquired during seasons between 2001 and 2008 in order to estimate the time delays between the lensed quasar images and to characterize at best the on-going micro-lensing events. We propose a highly performing photometric method called the adaptive point spread function fitting and have successf…
Gas Sloshing in Abell 2204: Constraining the Properties of the Magnetized Intracluster Medium
Andrade-Santos, Felipe; Jones, Christine; Li, Zhiyuan +2 more
The rich galaxy cluster Abell 2204 exhibits edges in its X-ray surface brightness at ∼65 and 35 {kpc} west and east of its center, respectively. The presence of these edges, which were interpreted as sloshing cold fronts, implies that the intracluster medium (ICM) was recently disturbed. We analyze the properties of the ICM using multiple Chandra …
Isophote Shapes of Early-type Galaxies in Massive Clusters at z ∼ 1 and 0
Perlmutter, Saul; Morokuma, Tomoki; Doi, Mamoru +5 more
We compare the isophote shape parameter a4 of early-type galaxies (ETGs) between z ∼ 1 and 0 as a proxy for dynamics to investigate the epoch at which the dynamical properties of ETGs are established, using cluster ETG samples with stellar masses of {log}({M}* /{M}⊙ )≥slant 10.5 which have spectroscopic redshifts. …
Ground-based astrometry calibrated by Gaia DR1: new perspectives in asteroid orbit determination
Mignard, F.; Tanga, P.; Altmann, M. +10 more
Context. The Gaia Data Release 1 (GDR1) is a first, important step on the path of evolution of astrometric accuracy towards a much improved situation. Although asteroids are not present in GDR1, this intermediate release already impacts asteroid astrometry.
Aims: Our goal is to investigate how the GDR1 can change the approach to a few typical…
Insights from Synthetic Star-forming Regions. II. Verifying Dust Surface Density, Dust Temperature, and Gas Mass Measurements with Modified Blackbody Fitting
Dale, James E.; Robitaille, Thomas P.; Koepferl, Christine M.
We use a large data set of realistic synthetic observations (produced in Paper I of this series) to assess how observational techniques affect the measurement physical properties of star-forming regions. In this part of the series (Paper II), we explore the reliability of the measured total gas mass, dust surface density and dust temperature maps …
A Radio Emission Analysis of Classical Nova V351 Pup (1991)
Strader, Jay; Chomiuk, Laura; Finzell, Thomas +2 more
Previously, Nova Puppis 1991 (V351 Pup) was measured to host one of the most massive ejections claimed in the literature. Multi-frequency radio detections from one epoch were published for this nova in the 1990's; and yet, the remaining data collected by the Karl G. Jansky Very Large Array (VLA) have remained unpublished. In this paper, we analyze…
Environmental impacts on dust temperature of star-forming galaxies in the local Universe
Nakagawa, Takao; Takita, Satoshi; Koyama, Yusei +1 more
We present infrared views of the environmental effects on the dust properties in star-forming (SF) galaxies at z ∼ 0, using the AKARI Far-Infrared Surveyor all-sky map and the large spectroscopic galaxy sample from Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7). We restrict the sample to those within the redshift range of 0.05 < z < 0.…