Search Publications
What can we learn about protoplanetary disks from analysis of mid-infrared carbonaceous dust emission?
Ménard, F.; Joblin, C.; Fuente, A. +1 more
Context: The disks of gas and dust that form around young stars and can lead to planet formation contain polycyclic aromatic hydrocarbons (PAHs) and very small grains (VSGs).
Aims: In this paper we analyze the mid-infrared (mid-IR) emission of these very small dust particles in a sample of 12 protoplanetary disks. Our goal is twofold: first we…
Physical Conditions in the Narrow-Line Region of Markarian 3. II. Photoionization Modeling Results
Kraemer, S. B.; Crenshaw, D. M.; Bruhweiler, F. C. +2 more
We have examined the physical conditions in the narrow-line region (NLR) of the Seyfert 2 galaxy Markarian 3, using long-slit spectra obtained with the Hubble Space Telescope/Space Telescope Imaging Spectrograph, and photoionization models. We find three components of photoionized gas in the NLR. Two of these components, characterized by emission …
Interacting Galaxies in the A901/902 Supercluster with Stages
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +22 more
We present a study of galaxy mergers and the influence of environment in the Abell 901/902 supercluster at z~ 0.165, based on 893 bright (R Vega<= 24) intermediate-mass (M * >= 109 M sun) galaxies. We use HST ACS F606W data from the Space Telescope A901/902 Galaxy Evolution Survey, COMBO-17, Spitze…
A Molecular Line Survey of the Highly Evolved Carbon Star CIT 6
Zhang, Yong; Kwok, Sun; Dinh-V-Trung
We present a spectral-line survey of the C-rich envelope CIT 6 in the 2 mm and 1.3 mm bands carried out with the Arizona Radio Observatory 12 m telescope and the Heinrich Hertz Submillimeter Telescope. The observations cover the frequency ranges of 131--160 GHz, 219--244 GHz, and 252--268 GHz with a typical sensitivity limit of TR < …
Magnetic non-potentiality on the quiet Sun and the filigree
Zhao, Meng; Wang, Jing-Xiu; Jin, Chun-Lan +1 more
From the observed vector magnetic fields by the Solar Optical Telescope/Spectro-Polarimeter aboard the satellite Hinode, we have examined whether or not the quiet Sun magnetic fields are non-potential, and how the G-band filigrees and Ca II network bright points (NBPs) are associated with the magnetic non-potentiality. A sizable quiet region in th…
XMM-Newton and Suzaku analysis of the Fe K complex in the type 1 Seyfert galaxy Mrk 509
Maraschi, L.; Bianchi, S.; Cappi, M. +11 more
We report on partially overlapping XMM-Newton (~260 ks) and Suzaku (~100 ks) observations of the iron K band in the nearby, bright type 1 Seyfert galaxy Mrk 509. The source shows a resolved neutral Fe K line, most probably produced in the outer part of the accretion disc. Moreover, the source shows further emission bluewards of the 6.4 keV line du…
Rosetta—one comet rendezvous and two asteroid fly-bys
Schulz, R.
One of the two planetary cornerstone missions of the European Space Agency is the Rosetta mission to comet 67P/Churyumov-Gerasimenko. Rosetta is a rendezvous mission with a comet nucleus, which combines an Orbiter with a Lander. It will monitor the evolution of the comet nucleus and the coma as a function of increasing and decreasing solar flux in…
Deep Optical Photometry of Six Fields in the Andromeda Galaxy
Ferguson, Henry C.; Brown, Thomas M.; Rich, R. Michael +7 more
Using the Advanced Camera for Surveys on the Hubble Space Telescope, we have obtained deep optical images reaching well below the oldest main-sequence turnoff in six fields of the Andromeda Galaxy. The fields fall at four positions on the southeast minor axis, one position in the giant stellar stream, and one position on the northeast major axis. …
The first two transient supersoft X-ray sources in M 31 globular clusters and the connection to classical novae
Della Valle, M.; Stiele, H.; Pietsch, W. +12 more
Context: Classical novae (CNe) have been found to represent the major class of supersoft X-ray sources (SSSs) in our neighbour galaxy M 31.
Aims: We determine the properties and evolution of the two first SSSs ever discovered in the M 31 globular cluster (GC) system.
Methods: We have used XMM-Newton, Chandra and Swift observations of the c…
MARSIS surface reflectivity of the south residual cap of Mars
Plaut, J. J.; Safaeinili, A.; Mouginot, J. +3 more
The south residual cap of Mars is commonly described as a thin and bright layer of CO 2-ice. The Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) is a low-frequency radar on board Mars Express operating at the wavelength between 55 and 230 m in vacuum. The reflection of the radar wave on a stratified medium like the …