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The Kelvin-Helmholtz instability under Parker-Spiral Interplanetary Magnetic Field conditions at the magnetospheric flanks
Adamson, E.; Otto, A.; Nykyri, K.
We have generated fully three-dimensional, high-resolution magnetohydrodynamic (MHD) simulations of the Kelvin-Helmholtz (KH) Instability during Parker-Spiral Interplanetary Magnetic Field (IMF) conditions at the dawnside magnetospheric flank magnetopause. Results of these simulations show that, although the draping of a strong tangential magnetic…
Velocity resolved [C II] spectroscopy of the center and the BCLMP 302 region of M 33 (HerM 33es)
Braine, J.; Ossenkopf, V.; van der Werf, P. +8 more
Context. The forbidden fine structure transition of C+ at 158 µm is one of the major cooling lines of the interstellar medium (ISM).
Aims: We aim to understand the contribution of the ionized, atomic, and molecular phases of the ISM to the [C II] emission from clouds near the dynamical center and the BCLMP302 H II region in t…
The Electron Density in Explosive Transition Region Events Observed by IRIS
Young, P. R.; Doschek, G. A.; Warren, H. P.
We discuss the intensity ratio of the O IV line at 1401.16 Å to the Si IV line at 1402.77 Å in Interface Region Imaging Spectrograph (IRIS) spectra. This intensity ratio is important if it can be used to measure high electron densities that cannot be measured using line intensity ratios of two different O IV lines from the multiplet within the IRI…
Mildly obscured active galaxies and the cosmic X-ray background
Walter, R.; Esposito, V.
Context. The diffuse cosmic X-ray background (CXB) is the sum of the emission of discrete sources, mostly massive black-holes accreting matter in active galactic nuclei (AGN). The CXB spectrum differs from the integration of the spectra of individual sources, calling for a large population, undetected so far, of strongly obscured Compton-thick AGN…
The hot gas content of fossil galaxy clusters
Arnaud, M.; Pointecouteau, E.; Pratt, G. W. +1 more
We investigate the properties of the hot gas in four fossil galaxy systems detected at high significance in the Planck Sunyaev-Zeldovich (SZ) survey. XMM-Newton observations reveal overall temperatures of kT ~ 5-6 keV and yield hydrostatic masses M500,HE ≳ 3.5 × 1014M⊙, confirming their nature as bona fide massive …
Deep Near-IR Observations of the Globular Cluster M4: Hunting for Brown Dwarfs
Knigge, C.; Bedin, L. R.; Rich, R. M. +5 more
We present an analysis of deep Hubble Space Telescope (HST)/Wide Field Camera 3 near-IR (NIR) imaging data of the globular cluster (GC) M4. The best-photometry NIR color-magnitude diagram (CMD) clearly shows the main sequence extending toward the expected end of the hydrogen-burning limit and going beyond this point toward fainter sources. The whi…
Resolved Companions of Cepheids: Testing the Candidates with X-Ray Observations
Schaefer, Gail H.; Bond, Howard E.; Evans, Nancy Remage +7 more
We have made XMM-Newton observations of 14 Galactic Cepheids that have candidate resolved (≥5″) companion stars based on our earlier HST Wide Field Camera 3 (WFC3) imaging survey. Main-sequence stars that are young enough to be physical companions of Cepheids are expected to be strong X-ray producers in contrast to field stars. XMM-Newton exposure…
A giant radio halo in a low-mass SZ-selected galaxy cluster: ACT-CL J0256.5+0006
Bond, J. R.; Menanteau, F.; Bharadwaj, V. +19 more
We present the detection of a giant radio halo (GRH) in the Sunyaev-Zel'dovich (SZ)-selected merging galaxy cluster ACT-CL J0256.5+0006 (z = 0.363), observed with the Giant Metrewave Radio Telescope at 325 and 610 MHz. We find this cluster to host a faint (S610 = 5.6 ± 1.4 mJy) radio halo with an angular extent of 2.6 arcmin, correspond…
SXDF-ALMA 2 arcmin2 deep survey: Resolving and characterizing the infrared extragalactic background light down to 0.5 mJy
Tamura, Yoichi; Kohno, Kotaro; Yun, Min S. +22 more
We present a multiwavelength analysis of five submillimeter sources (S1.1mm = 0.54-2.02 mJy) that were detected during our 1.1 mm deep continuum survey in the Subaru/XMM-Newton Deep Survey Field (SXDF)-UDS-CANDELS field (2 arcmin2, 1σ = 0.055 mJy beam-1) using the Atacama Large Millimeter/submillimeter Array (ALMA)…
Multiwavelength campaign on Mrk 509. XV. Global modeling of the broad emission lines in the optical, UV, and X-ray bands
Kaastra, J. S.; Arav, N.; Bianchi, S. +11 more
Aims: We model the broad emission lines present in the optical, UV, and X-ray spectra of Mrk 509, a bright type 1 Seyfert galaxy. The broad lines were simultaneously observed during a large multiwavelength campaign, using the XMM-Newton-OM for the optical lines, HST-COS for the UV lines, and XMM-Newton-RGS and Epic for the X-ray lines. We als…