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Kinematic analysis of a sample of X-ray luminous distant galaxy clusters. The LX - σv relation in the z > 0.6 universe
Böhringer, H.; Pratt, G. W.; Rosati, P. +11 more
Aims: Observations and cosmological simulations show galaxy clusters as a family of nearly self-similar objects with properties that can be described by scaling relations as a function of mass and time. Here we study the scaling relations between the galaxy velocity dispersion (σv) and X-ray quantities, such as X-ray bolometric lum…
Discovery of new low-excitation planetary nebulae
Zhang, Yong; Hsia, Chih-Hao
We report a multi-wavelength study of four new planetary nebula (PN) candidates selected from the INT/WFC Photometric Hα Survey of the Northern Galactic Plane (IPHAS) and Deep Sky Hunter (DSH) catalogues. We present mid-resolution optical spectra of these PNs. The PN status of our sample was confirmed by optical narrow-band images and mid-resoluti…
Interaction Between Two CMEs During 14 - 15 February 2011 and Their Unusual Radio Signature
Shanmugaraju, A.; Prasanna Subramanian, S.; Ibrahim, M. Syed +1 more
We report a detailed analysis of an interaction between two coronal mass ejections (CMEs) that were observed on 14 - 15 February 2011 and the corresponding radio enhancement, which was similar to the "CME cannibalism" reported by Gopalswamy et al. (Astrophys. J.548, L91, 2001). A primary CME, with a mean field-of-view velocity of 669 km s−1
Magnetic pattern at supergranulation scale: the void size distribution
Berrilli, F.; Del Moro, D.; Scardigli, S.
The large-scale magnetic pattern observed in the photosphere of the quiet Sun is dominated by the magnetic network. This network, created by photospheric magnetic fields swept into convective downflows, delineates the boundaries of large-scale cells of overturning plasma and exhibits "voids" in magnetic organization. These voids include internetwo…
A thin diffuse component of the Galactic ridge X-ray emission and heating of the interstellar medium contributed by the radiation of Galactic X-ray binaries
Molaro, Margherita; Khatri, Rishi; Sunyaev, Rashid A.
We predict a thin diffuse component of the Galactic ridge X-ray emission (GRXE) arising from the scattering of the radiation of bright X-ray binaries (XBs) by the interstellar medium. This scattered component has the same scale height as that of the gaseous disk (~80 pc) and is therefore thinner than the GRXE of stellar origin (scale height ~130 p…
Entropy Flattening, Gas Clumping, and Turbulence in Galaxy Clusters
Lapi, A.; Fusco-Femiano, R.
Several physical processes and formation events are expected in cluster outskirts, a vast region up to now essentially not covered by observations. The recent Suzaku (X-ray) and Planck (Sunyaev-Zel'dovich (SZ) effect) observations out to the virial radius have highlighted in these peripheral regions a rather sharp decline of the intracluster gas t…
Higher prevalence of X-ray selected AGN in intermediate-age galaxies up to z ∼ 1
Barro, Guillermo; Pérez-González, Pablo G.; Nandra, Kirpal +9 more
We analyse the stellar populations in the host galaxies of 53 X-ray selected optically dull active galactic nuclei (AGN) at 0.34 < z < 1.07 with ultradeep (mAB = 26.5, 3σ) optical medium-band (R ∼ 50) photometry from the Survey for High-z Absorption Red and Dead Sources (SHARDS). The spectral resolution of SHARDS allows us to cons…
HST and LAMOST discover a dual active galactic nucleus in J0038+4128
Huang, Y.; Xiang, M. -S.; Yuan, H. -B. +6 more
We report the discovery of a kiloparsec-scale dual active galactic nucleus (AGN) in J0038+4128. From the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) images, we find two optical nuclei with a projection separation of 4.7 kpc (3.44 arcsec). The southern component (J0038+4128S) is spectroscopically observed with the HST Goddard…
Strong lensing in RX J1347.5-1145 revisited
Schmidt, R. W.; Köhlinger, F.
We present a revised strong lensing mass reconstruction of the galaxy cluster RX J1347.5-1145. The X-ray luminous cluster at redshift z = 0.451 has already been studied intensively in the past. Based on information of two such previous (strong-) lensing studies by Halkola et al. and Bradač et al., as well as by incorporating newly available data f…
Dynamics and metallicity of far-infrared selected galaxies
Lutz, D.; Maiolino, R.; Marconi, A. +4 more
We present near-infrared integral field spectroscopy of 10 Herschel selected galaxies at z ∼ 1.5. From detailed mapping of the Hα and [N II] emission lines, we trace the dynamics, star formation rates, metallicities and also investigate gas fractions for these galaxies. For a few galaxies, the distribution of star formation as traced by Hα only tr…