Search Publications
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nova in the 1990's; and yet, the remaining data collected by the Karl G. Jansky Very Large Array (VLA) have remained unpublished.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.…
Faraday rotation fluctuations of MESSENGER radio signals through the equatorial lower corona near solar minimum
Jensen, E. A.; Heiles, C.; Hollweg, J. V. +4 more
Faraday rotation (FR) of transcoronal radio transmissions from spacecraft near superior conjunction enables study of the temporal variations in coronal plasma density, velocity, and magnetic field. The MESSENGER spacecraft 8.4 GHz radio, transmitting through the corona with closest line-of-sight approach 1.63-1.89 solar radii and near-equatorial h…
Natural emergence of neutrino masses and dark matter from R-symmetry
Chakraborty, Sabyasachi; Chakrabortty, Joydeep
We propose a supersymmetric extension of the Standard Model (SM) with a continuous global U(1) R symmetry. The R-charges of the SM fields are identified with that of their lepton numbers. As a result, both bilinear and trilinear ` R-parity violating' (RPV) terms could be present at the superpotential. However, R-symmetry is not an exac…
Galactic Kinematics Derived From Data in the RAVE5, UCAC4, PPMXL, and Gaia TGAS Catalogs
Bobylev, V. V.; Bajkova, A. T.; Tsvetkov, A. S. +1 more
The three-dimensional velocities of stars with high-precision positions, proper motions, and parallaxes from the Gaia TGAS catalog and radial velocities from the RAVE5 catalog are examined. A sample of 92395 stars with estimated ages yields the following kinematic parameters: (U, V, W)=(9.42, 20.34, 7.21)±(0.12, 0.10, 0.09) km/s, Ω = 26.29 ± 0.39 …
Mapping the temperature of the intra-cluster medium with the thermal Sunyaev-Zel'dovich effect
Hurier, G.; Tchernin, C.
The hot electrons in the intra-cluster medium produce a spectral distortion of the cosmic microwave background (CMB) black body emission, the thermal Sunyaev-Zel'dovich effect (tSZ). This characteristic spectral distortion is now commonly used to detect and characterize the properties of galaxy clusters. The tSZ effect spectral distortion does not…