Search Publications
The relationship between polycyclic aromatic hydrocarbon emission and far-infrared dust emission from NGC 2403 and M83
Boquien, M.; Fritz, J.; Lebouteiller, V. +13 more
We examine the relation between polycyclic aromatic hydrocarbon (PAH) emission at 8 µm and far-infrared emission from hot dust grains at 24 µm and from large dust grains at 160 and 250 µm in the nearby spiral galaxies NGC 2403 and M83 using data from the Spitzer Space Telescope and Herschel Space Observatory. We find that the PAH…
Infrared identification of hard X-ray sources in the Galaxy
Motch, C.; Pineau, F. -X.; Carrera, F. J. +3 more
The nature of the low- to intermediate-luminosity (LX ∼ 1032-34 erg s-1) source population revealed in hard band (2-10 keV) X-ray surveys of the Galactic plane is poorly understood. To overcome such problem, we cross-correlated the XMM-Newton 3XMM-DR4 survey with the infrared Two Micron All Sky Survey and Galactic …
Deriving physical parameters of unresolved star clusters. III. Application to M 31 PHAT clusters
Narbutis, D.; Vansevičius, V.; de Meulenaer, P. +1 more
Context. This study is the third of a series that investigates the degeneracy and stochasticity problems present in the determination of physical parameters such as age, mass, extinction, and metallicity of partially resolved or unresolved star cluster populations situated in external galaxies when using broad-band photometry.
Aims: This work…
Limited role for thermal erosion by turbulent lava in proximal Athabasca Valles, Mars
Williams, David A.; Dundas, Colin M.; Keszthelyi, Laszlo P. +1 more
The Athabasca Valles flood lava is among the most recent (<50 Ma) and best preserved effusive lava flows on Mars and was probably emplaced turbulently. The Williams et al. (2005) model of thermal erosion by lava has been applied to what we term "proximal Athabasca," the 75 km long upstream portion of Athabasca Valles. For emplacement volumes of…
The extended ROSAT-ESO Flux-Limited X-ray Galaxy Cluster Survey (REFLEX II). VI. Effect of massive neutrinos on the cosmological constraints from clusters
Böhringer, Hans; Chon, Gayoung
Clusters of galaxies are important probes for the large-scale structure that allow us to test cosmological models. With the REFLEX II galaxy cluster survey we previously derived tight constraints on the cosmological parameters for the matter density, Ωm, and the amplitude parameter of the matter density fluctuations, σ8. Wher…
Emission-line-selected galaxies at z = 0.6-2 in GOODS South: Stellar masses, SFRs, and large-scale structure
Milvang-Jensen, B.; Fynbo, J. P. U.; Christensen, L. +7 more
We have obtained deep NIR narrow and broad (J and Y) band imaging data of the GOODS-South field. The narrow band filter is centered at 1060 nm corresponding to redshifts z = 0.62,1.15,1.85 for the strong emission lines Hα, [Oiii]/Hβ and [Oii], respectively. From those data we extract a well defined sample (M(AB) = 24.8 in the narrow band) of objec…
Photospheric Abundances of Polar Jets on the Sun Observed by Hinode
Lee, Kyoung-Sun; Brooks, David H.; Imada, Shinsuke
Many jets are detected at X-ray wavelengths in the Sun's polar regions, and the ejected plasma along the jets has been suggested to contribute mass to the fast solar wind. From in situ measurements in the magnetosphere, it has been found that the fast solar wind has photospheric abundances while the slow solar wind has coronal abundances. Therefor…
Identifying and Tracking of Peripheral and Central Umbral Dots
Yang, Yunfei; Ji, Kaifan; Feng, Song +3 more
Umbral dots (UDs) are small isolated brightening observed in sunspot umbrae. They are usually classified into peripheral UDs (PUDs) and central UDs (CUDs) according to their positions inside an umbra. To accurately investigate the similarities and the distinctions between PUDs and CUDs and better understand their formation mechanisms, we propose a…
Dynamics of CMEs in the LASCO Field of View
Gopalswamy, N.; Bronarska, K.; Michalek, G. +1 more
A large set (16 000) of coronal mass ejections (CMEs) observed during 1996 - 2011 was selected to study their dynamics in the LASCO field of view (LFOV). These events were selected based on the criterion that at least three height-time measurements were available for each CME. The height-time measurements included in the SOHO/LASCO catalog were us…
Sources of Local Time Asymmetries in Magnetodiscs
Jackman, C. M.; Khurana, K. K.; Kane, M. +2 more
The rapidly rotating magnetospheres at Jupiter and Saturn contain a near-equatorial thin current sheet over most local times known as the magnetodisc, resembling a wrapped-up magnetotail. The Pioneer, Voyager, Ulysses, Galileo, Cassini and New Horizons spacecraft at Jupiter and Saturn have provided extensive datasets from which to observationally …