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Strömgren and near-infrared photometry of metal-rich bulge globular clusters. I. NGC 6528 and its surrounding field
Milone, A. P.; Lagioia, E. P.; Zoccali, M. +9 more
We present Strömgren and near-infrared (NIR) photometry of the bulge cluster NGC 6528 and its surrounding field in Baade's Window. uvby images were collected with EFOSC2 on the New Technology Telescope (NTT, La Silla, ESO). The NIR catalogs are based on J,K-band VIRCAM at VISTA (Paranal, ESO) and SOFI at NTT photometry. We matched the aforemention…
The Discovery of a Radio Halo in PLCK G147.3-16.6 at z = 0.65
van Weeren, R. J.; Forman, W. R.; Röttgering, H. J. A. +9 more
Recent X-ray and Sunyaev-Zel'dovich (SZ) observations have dramatically increased the number of known distant galaxy clusters. In some merging, low-redshift (z < 0.4) clusters, centrally located, diffuse, extended radio emission (radio halos) has been found. Using the Giant Metrewave Radio Telescope (GMRT), we report the detection of diffuse ra…
Structual study of Galactic hot gas toward Markarian 421 from X-ray absorption and emission lines
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Wang, Q. Daniel +4 more
We present a structural study of the hot ISM in the Galactic halo along the sight line toward the bright active galactic nucleus Mkn 421. The O VII and O VIII absorption lines were measured with the Low Energy Transmission Grating Spectrograph aboard Chandra toward Mkn 421; the O VII and O VIII emission lines were observed in the adjacent fields o…
Tracking the Complex Absorption in NGC 2110 with Two Suzaku Observations
Okajima, Takashi; Fukazawa, Yasushi; Ueda, Yoshihiro +6 more
We present spectral analysis of two Suzaku observations of the Seyfert 2 galaxy, NGC 2110. This source has been known to show complex, variable absorption which we study in depth by analyzing these two observations set 7 yr apart and by comparing them to previously analyzed observations with the XMM-Newton and Chandra observatories. We find that t…
The Norma Arm Region Chandra Survey Catalog: X-Ray Populations in the Spiral Arms
An, Hongjun; Bauer, Franz E.; Stern, Daniel +6 more
We present a catalog of 1415 X-ray sources identified in the Norma Arm Region Chandra Survey (NARCS), which covers a 2° × 0.°8 region in the direction of the Norma spiral arm to a depth of ≈20 ks. Of these sources, 1130 are point-like sources detected with >=3σ confidence in at least one of three energy bands (0.5-10, 0.5-2, and 2-10 keV), five…
X-ray emission from an FU Orionis star in early outburst: HBC 722
Skinner, Stephen L.; Güdel, Manuel; Green, Joel +1 more
Aims: We conducted the first X-ray observations of the newly erupting FU Ori-type outburst in HBC 722 (V2493 Cyg) with the aim to characterize its X-ray behavior and near-stellar environment during early outburst.
Methods: We used data from the XMM-Newton and Chandra X-ray observatories to measure X-ray source temperatures and luminositi…
The extension of ionospheric holes into the tail of Venus
Fedorov, A.; Barabash, S.; Holmström, M. +8 more
Ionospheric holes are Cytherian nightside phenomena discovered by the NASA Pioneer Venus Orbiter, featuring localized plasma depletions driven by prominent and unexplained enhancements in the draped interplanetary magnetic field. Observed only during solar maximum, the phenomenon remains unexplained, despite their frequent observation during the f…
Detection of galaxies with Gaia
Ducourant, C.; Krone-Martins, A.; Teixeira, R. +2 more
Aims: Besides its major objective tuned to detecting the stellar galactic population, the Gaia mission experiment will also observe a large number of galaxies. In this work we intend to evaluate the number and the characteristics of the galaxies that will effectively pass the on-board selection algorithm of Gaia.
Methods: The detection o…
Interpreting the extended emission around three nearby debris disc host stars
Eiroa, C.; Marshall, J. P.; Montesinos, B. +7 more
Context. Cool debris discs are a relic of the planetesimal formation process around their host star, analogous to the solar system's Edgeworth-Kuiper belt. As such, they can be used as a proxy to probe the origin and formation of planetary systems like our own.
Aims: The Herschel open time key programmes "DUst around NEarby Stars" (DUNES) and…
Measurements of Coronal Faraday Rotation at 4.6 R ⊙
Kooi, Jason E.; Fischer, Patrick D.; Buffo, Jacob J. +1 more
Many competing models for the coronal heating and acceleration mechanisms of the high-speed solar wind depend on the solar magnetic field and plasma structure in the corona within heliocentric distances of 5 R ⊙. We report on sensitive Very Large Array (VLA) full-polarization observations made in 2011 August, at 5.0 and 6.1 GHz (each wi…