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Separating the BL Lac and cluster X-ray emissions in Abell 689 with Chandra
Birkinshaw, M.; Worrall, D. M.; Maughan, B. J. +2 more
We present the results of a Chandra observation of the galaxy cluster Abell 689 (z = 0.279). Abell 689 is one of the most luminous clusters detected in the ROSAT All Sky Survey (RASS), but was flagged as possibly including significant point source contamination. The small point spread function of the Chandra telescope allows us to confirm this and…
The Mass-Richness Relation of MaxBCG Clusters from Quasar Lensing Magnification Using Variability
Baltay, Charles; Rabinowitz, David; Bauer, Anne H. +3 more
Accurate measurement of galaxy cluster masses is an essential component not only in studies of cluster physics but also for probes of cosmology. However, different mass measurement techniques frequently yield discrepant results. The Sloan Digital Sky Survey MaxBCG catalog's mass-richness relation has previously been constrained using weak lensing …
RW Aur A from the X-Wind Point of View: General Features
Liu, Chun-Fan; Shang, Hsien
In this paper, the RW Aur A microjet is studied from the point of view of X-wind models. The archived Hubble Space Telescope/STIS spectra of the optical forbidden lines [O I], [S II], and [N II] from RW Aur A, taken in Cycle 8 with seven parallel slits along the jet axis, spaced at 0farcs07 apart, were analyzed. Images, position-velocity diagrams,…
Disturbed Zone and Piston Shock Ahead of Coronal Mass Ejection
Eselevich, M.; Eselevich, V.
The 2010 June 13 coronal mass ejection (CME) propagating toward the position angle P.A. ≈ 245° (measured counterclockwise from the Sun's north pole) was studied from the SDO/AIA and SOHO/LASCO C2, C3 data. We show that ahead of the CME frontal structure, as a result of its interaction with the undisturbed solar wind, a disturbed region (with an in…
Three-dimensional Structure and Evolution of Extreme-ultraviolet Bright Points Observed by STEREO/SECCHI/EUVI
Moon, Yong-Jae; Chae, Jongchul; Zhang, Jie +4 more
We unveil the three-dimensional structure of quiet-Sun EUV bright points and their temporal evolution by applying a triangulation method to time series of images taken by SECCHI/EUVI on board the STEREO twin spacecraft. For this study we examine the heights and lengths as the components of the three-dimensional structure of EUV bright points and t…
Physical Properties of Lyα Emitters at z ~ 0.3 from UV-to-FIR Measurements
Berta, S.; Magnelli, B.; Lutz, D. +25 more
The analysis of the physical properties of low-redshift Lyα emitters (LAEs) can provide clues in the study of their high-redshift analogs. At z ~ 0.3, LAEs are bright enough to be detected over almost the entire electromagnetic spectrum and it is possible to carry out a more precise and complete study than at higher redshifts. In this work, we exa…
Transiting exoplanets from the CoRoT space mission Resolving the nature of transit candidates for the LRa03 and SRa03 fields
Mazeh, T.; Aigrain, S.; Alonso, R. +47 more
CoRoT is a space telescope which aims at studying internal structure of stars and detecting extrasolar planets. We present here a list of transits detected in the light curves of stars observed by CoRoT in two fields in the anti-center direction: the LRa03 one observed during 148 days from 3 October 2009 to 1 March 2010 followed by the SRa03 one f…
Aperture Photometry Tool Versus SExtractor for Noncrowded Fields
Gorjian, Varoujan; Law, Nicholas M.; Grillmair, Carl +28 more
Outputs from new software program Aperture Photometry Tool (APT) are compared with similar outputs from SExtractor for sources extracted from R-band optical images acquired by the Palomar Transient Factory (PTF), infrared mosaics constructed from Spitzer Space Telescope images, and a processed visible/near-infrared image from the Hubble Legacy Arc…
Radiation-driven winds of hot luminous stars. XVII. Parameters of selected central stars of PN from consistent optical and UV spectral analysis and the universality of the mass-luminosity relation
Pauldrach, A. W. A.; Kaschinski, C. B.; Hoffmann, T. L.
Context. The commonly accepted mass-luminosity relation of central stars of planetary nebulae (CSPNs) might not be universally valid. While the atmospheric parameters Teff, log g, and the He abundances have in the past been determined using fits to photospheric H and He absorption lines from plane-parallel model atmospheres, the masses …
Mapping Titan's surface features within the visible spectrum via Cassini VIMS
Sotin, Christophe; Barnes, Jason W.; Le Mouélic, Stéphane +10 more
Titan shows its surface through many methane windows in the 1-5 µm region. Windows at shorter wavelengths also exist, polluted by scattering off of atmospheric haze that reduces the surface contrast. At visible wavelengths, the surface of Titan has been observed by Voyager I, the Hubble Space Telescope, and ground-based telescopes. We presen…