Search Publications

Thermal Structure and Composition

Encrenaz, Thérèse; Smith, Michael D.; Bougher, Stephen W. +2 more

OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2 - III. Galaxy properties across projected phase space in A901/2

Chies-Santos, Ana L.; Wolf, Christian; Aragón-Salamanca, Alfonso +6 more

We conduct a comprehensive projected phase-space analysis of the A901/2 multicluster system at z ∼ 0.165. Aggregating redshifts from spectroscopy, tunable-filter imaging and prism techniques, we assemble a sample of 856 cluster galaxies reaching 10^8.5 M_⊙ in stellar mass. We look for variations in cluster galaxy properties bet…

Stacked Average Far-infrared Spectrum of Dusty Star-forming Galaxies from the Herschel/SPIRE Fourier Transform Spectrometer

Pearson, Chris; Clements, David L.; Valtchanov, Ivan +13 more

We present stacked average far-infrared spectra of a sample of 197 dusty star-forming galaxies (DSFGs) at 0.005< z< 4 using about 90% of the Herschel Space Observatory SPIRE Fourier Transform Spectrometer (FTS) extragalactic data archive based on 3.5 years of science operations. These spectra explore an observed-frame 447-1568 GHz frequency …

Orbiting a binary. SPHERE characterisation of the HD 284149 system

Avenhaus, H.; Fantinel, D.; Messina, S. +53 more

Aims: In this paper we present the results of the SPHERE observation of the HD 284149 system, aimed at a more detailed characterisation of both the primary and its brown dwarf companion.
Methods: We observed HD 284149 in the near-infrared with SPHERE, using the imaging mode (IRDIS+IFS) and the long-s…

A systematic analysis of the XMM-Newton background: I. Dataset and extraction procedures

Tiengo, Andrea; De Luca, Andrea; Marelli, Martino +6 more

XMM-Newton is the direct precursor of the future ESA ATHENA mission. A study of its particle-induced background provides therefore significant insight for the ATHENA mission design. We make use of ∼12 years of data, products from the third XMM-Newton catalog as well as FP7 EXTraS project to avoid celestial sources contamination and to disentangle …

Detection of Extraplanar Diffuse Ionized Gas in M83

Gallagher, J. S., III; Boettcher, Erin; Zweibel, Ellen G.

We present the first kinematic study of extraplanar diffuse ionized gas (eDIG) in the nearby, face-on disk galaxy M83 using optical emission-line spectroscopy from the Robert Stobie Spectrograph on the Southern African Large Telescope. We use a Markov Chain Monte Carlo method to decompose the [N II]λ λ 6548, 6583, Hα, and [S II]λ λ 6717, 6731 emis…

Time-dependent Ionization in a Steady Flow in an MHD Model of the Solar Corona and Wind

Reeves, Katharine K.; Raymond, John C.; Linker, Jon A. +3 more

Time-dependent ionization is important for diagnostics of coronal streamers and pseudostreamers. We describe time-dependent ionization calculations for a three-dimensional magnetohydrodynamic (MHD) model of the solar corona and inner heliosphere. We analyze how non-equilibrium ionization (NEI) influences emission from a pseudostreamer during the W…

Size Dependence of Dust Distribution around the Earth Orbit

Kaneda, Hidehiro; Ishihara, Daisuke; Kondo, Toru +3 more

In the solar system, interplanetary dust particles (IDPs) originating mainly from asteroid collisions and cometary activities drift to Earth orbit due to Poynting-Robertson drag. We analyzed the thermal emission from IDPs that was observed by the first Japanese infrared astronomical satellite, AKARI. The observed surface brightness in the trailing…

Comparing Coronal and Heliospheric Magnetic Fields over Several Solar Cycles

Mursula, K.; Koskela, J. S.; Virtanen, I. I.

Here we use the PFSS model and photospheric data from Wilcox Solar Observatory, SOHO/MDI, SDO/HMI, and SOLIS to compare the coronal field with heliospheric magnetic field measured at 1 au, compiled in the NASA/NSSDC OMNI 2 data set. We calculate their mutual polarity match and the power of the radial decay, p, of the radial field using different s…

Rotationally modulated variability and pulsations of the He-rich star CPD -62°2124 with an extraordinarily strong magnetic field

Ilyin, I.; Hubrig, S.; Zejda, M. +5 more

A longitudinal magnetic field with a strength of 5.2 kG was recently detected in CPD -62°2124, which has a fractional main-sequence lifetime of about 60 per cent. Strongly magnetic early-B type chemically peculiar stars in an advanced evolutionary state are of special interest to understand the evolution of the angular momentum and spin-down time-…