Search Publications
Enhanced dust heating in the bulges of early-type spiral galaxies
Roussel, H.; Murphy, E. J.; Armus, L. +38 more
Stellar density and bar strength should affect the temperatures of the cool (T ~ 20-30 K) dust component in the inner regions of galaxies, which implies that the ratio of temperatures in the circumnuclear regions to the disk should depend on Hubble type. We investigate the differences between cool dust temperatures in the central 3 kpc and disk of…
High-resolution X-ray spectroscopy of the Seyfert 1 Mrk 841: insights into the warm absorber and warm emitter
Costantini, E.; Ponti, G.; Boisson, C. +6 more
Context. The Seyfert 1 galaxy Mrk 841 was observed five times between 2001 and 2005 by the XMM-Newton X-ray observatory. The source is well known for showing spectral complexity in the variable iron line and in the soft X-ray excess.
Aims: The availability of multiple exposures obtained by the reflection grating spectrometer (RGS) cameras all…
Radially extended kinematics and stellar populations of the massive ellipticals NGC 1600, NGC 4125, and NGC 7619 . Constraints on the outer dark halo density profile
Saglia, R. P.; Thomas, J.; Bender, R. +3 more
We present high quality long slit spectra along the major and minor axes out to 1.5-2 Re (14-22 kpc) of three bright elliptical galaxies (NGC 1600, NGC 4125, NGC 7619) obtained at the Hobby-Eberly Telescope (HET). We derive stellar kinematic profiles and Lick/IDS indices (Hβ, Mgb, Fe5015, Fe5270, Fe5335,…
Star-galaxy separation by far-infrared color-color diagrams for the AKARI FIS all-sky survey (bright source catalog version β-1)
Takeuchi, T. T.; Pollo, A.; Rybka, P.
Aims: To separate stars and galaxies in the far infrared AKARI all-sky survey data, we have selected a sample with the complete color information available in the low extinction regions of the sky and constructed color-color plots for these data. We looked for the method of separating stars and galaxies using the color information.
Metho…
Tracing the sites of obscured star formation in the Antennae galaxies with Herschel-PACS
Krause, O.; Klaas, U.; Haas, M. +2 more
Aims: FIR imaging of interacting galaxies allows locating even hidden sites of star formation and measuring of the relative strength of nuclear and extra-nuclear star formation. We want to resolve the star-forming sites in the nearby system of the Antennae.
Methods: Thanks to the unprecedented sharpness and depth of the PACS camera onboa…
Observations and modeling of the dust emission from the H2-bright galaxy-wide shock in Stephan's Quintet
Boulanger, F.; Appleton, P. N.; Guillard, P. +3 more
Context. Spitzer Space Telescope observations have detected powerful mid-infrared (mid-IR) H2 rotational line emission from the X-ray emitting large-scale shock (~15 × 35 kpc2) associated with a galaxy collision in Stephan's Quintet (SQ). Because H2 forms on dust grains, the presence of H2 is physically …
Small-scale structure in the Rosette molecular cloud revealed by Herschel
Olofsson, G.; Abergel, A.; André, Ph. +40 more
We present a preliminary analysis of the small-scale structure found in new 70-520 µm continuum maps of the Rosette molecular cloud (RMC), obtained with the SPIRE and PACS instruments of the Herschel Space Observatory. We find 473 clumps within the RMC using a new structure identification algorithm, with sizes up to ~1.0 pc in diameter. A co…
A new type of small-scale downflow patches in sunspot penumbrae
Katsukawa, Y.; Jurčák, J.
Context. Magnetic and flow structures in a sunspot penumbra are created by strong interplay between inclined magnetic fields and photospheric convection. They exhibit a complex nature that cannot always be explained by the well-known Evershed flow.
Aims: A sunspot penumbra is observationally examined to reveal properties of small-scale flow s…
Cool gas and dust in M 33: Results from the HERschel M 33 Extended Survey (HERM33ES)
Boquien, M.; Braine, J.; Calzetti, D. +23 more
We present an analysis of the first space-based far-IR-submm observations of M 33, which measure the emission from the cool dust and resolve the giant molecular cloud complexes. With roughly half-solar abundances, M 33 is a first step towards young low-metallicity galaxies where the submm may be able to provide an alternative to CO mapping to meas…
PACS and SPIRE spectroscopy of the red supergiant VY CMa
Ivison, R. J.; Blommaert, J. A. D. L.; Olofsson, G. +34 more
With a luminosity >105 L⊙ and a mass-loss rate of ~2 × 10-4 M⊙ yr-1, the red supergiant VY CMa truly is a spectacular object. Because of its extreme evolutionary state, it could explode as supernova any time. Studying its circumstellar material, into which the supernova blast will run, prov…