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Morphology and structure of extremely red objects at z ∼ 1 in the CANDELS-COSMOS field
Kong, Xu; Chen, Yang; Fang, Guan-Wen +1 more
Using high-resolution HST/Wide Field Camera 3 F125W imaging from the CANDELS-COSMOS field, we report the structural and morphological properties of extremely red objects (EROs) at z ∼ 1. Based on the UVJ color criteria, we separate EROs into two types: old passive galaxies (OGs) and dusty star-forming galaxies (DGs). For a given stellar mass, we f…
Suzaku observations of the old pulsar wind nebula candidate HESS J1356-645
Dotani, Tadayasu; Bamba, Aya; Hiraga, Junko S. +3 more
A largely extended X-ray emission was discovered around the pulsar PSR J1357-6429 with the Suzaku deep observations. The pulsar, whose characteristic age is 7.3 kyr, is located within the TeV γ-ray source HESS J1356-645. The extended emission is found to have a 1 σ X-ray size of ∼ 4', or ∼ 3 pc at 2.4 kpc, with a small offset from the pulsar. Its …
Magnetopause orientation: Comparison between generic residue analysis and BV method
Dorville, Nicolas; Belmont, Gérard; Rezeau, Laurence +2 more
Determining the direction normal to the magnetopause layer is a key step for any study of this boundary. Various techniques have been developed for this purpose. We focus here on generic residue analysis (GRA) methods, which are based on conservation laws, and the new iterative BV method, where B represents the magnetic field and V refers to the i…
The gaia survey contribution to EChO target selection and characterization
Sozzetti, Alessandro; Damasso, Mario
The scientific output of the proposed EChO mission (in terms of spectroscopic characterization of the atmospheres of transiting extrasolar planets) will be maximized by a careful selection of targets and by a detailed characterization of the main physical parameters (such as masses and radii) of both the planets and their stellar hosts. To achieve…
Eruption of the magnetic flux rope in a quick decaying active region
Yang, Shangbin; Liu, Jihong; Xie, Wenbin
An isolated and quickly decaying active region (NOAA 9729) was observed as it passed across the solar disk. There was only one CME associated with the active region, which provides a good opportunity to investigate the whole process of the CME. A filament in this active region was observed to rise rapidly before stalling and disintegrating into fl…
Ultraviolet Spectroscopy of PQ Gem and V405 Aur from the HST and IUE Satellites
Sanad, M. R.
Ultraviolet spectra of two intermediate polars (IPs), PQ Gem and V405 Aur, observed with Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph and Faint Object Spectrograph and International Ultraviolet Explorer (IUE) satellites were analyzed during the period between 1994-2000. We estimated the reddening of the two systems from the 22…
Simulations of cm-wavelength Sunyaev-Zel'dovich galaxy cluster and point source blind sky surveys and predictions for the RT32/OCRA-f and the Hevelius 100-m radio telescope
Birkinshaw, Mark; Lew, Bartosz; Wilkinson, Peter +1 more
We investigate the effectiveness of blind surveys for radio sources and galaxy cluster thermal Sunyaev-Zel'dovich effects (TSZEs) using the four-pair, beam-switched OCRA-f radiometer on the 32-m radio telescope in Poland. The predictions are based on mock maps that include the cosmic microwave background, TSZEs from hydrodynamical simulations of l…
Astrometric observations of Phobos with the SRC on Mars Express. New data and comparison of different measurement techniques
Oberst, J.; Hoffmann, H.; Willner, K. +7 more
Aims: From April 2008 to August 2011 Mars Express carried out 74 Phobos flybys at distances between 669 and 5579 km. Images taken with the Super Resolution Channel (SRC) were used to determine the spacecraft-centered right ascension and declination of this Martian moon.
Methods: Image positions of Phobos were measured using the limb-fit …
Mass distribution in an assembling super galaxy group at z = 0.37
Tran, Kim-Vy H.; Schrabback, Tim; Moustakas, John +4 more
Aims: We present a weak gravitational lensing analysis of supergroup SG1120-1202, consisting of four distinct X-ray-luminous groups that will merge to form a cluster comparable in mass to Coma at z = 0. These groups lie within a projected separation of 1 to 4 Mpc and within Δv = 550 km s-1 and form a unique protocluster to study th…
A new estimate of the Local Standard of Rest from data on young objects
Bobylev, V. V.; Bajkova, A. T.
To estimate the peculiar velocity of the Sun with respect to the Local Standard of Rest (LSR), we use young objects in the Solar neighborhood with distance measurement errors within 10%--15%. These objects include the nearest Hipparcos O--B2.5 type stars, masers with VLBI trigonometric parallaxes, and two samples consisting of the youngest and mid…