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The [O III] Veil: Astropause of η Carinae's Wind?
Smith, Nathan; Bally, John; Morse, Jon A.
We present narrowband images of η Carinae in the light of [O III] λ5007 obtained with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2, as well as a ground-based image in the same emission line with a larger field of view. These images show a thin veil of [O III] emission around η Car and its ejecta, confirming the existence of an ox…
Why Optically Faint AGNs Are Optically Faint: The Spitzer Perspective
Rigby, J. R.; Barmby, P.; Fazio, G. G. +5 more
Optically faint X-ray sources (those with fX/fR>10) constitute about 20% of X-ray sources in deep surveys and are potentially highly obscured and/or at high redshift. Their faint optical fluxes are generally beyond the reach of spectroscopy. For a sample of 20 optically faint sources in CDFS, we compile 0.4-24 µm pho…
OH megamasers, starburst and AGN activity in Markarian 231
Knapen, J. H.; Richards, A. M. S.; Gray, M. D. +5 more
We present Multi-Element Radio-Linked Interferometer Network (MERLIN) observations of OH maser and radio continuum emission within a few hundred pc of the core of the ultraluminous infrared galaxy (ULIRG) Markarian 231. This is the only known OH megamaser galaxy classed as a Seyfert 1. Maser emission is identified with the 1665- and 1667-MHz trans…
Star formation histories in local group dwarf galaxies [review article]
Skillman, Evan D.
I review observations made with the Hubble Space Telescope which have improved our view of both recent (ages ⩽1 Gyr) and ancient (ages ⩾1 Gyr) star formation histories in dwarf galaxies. The method of reconstructing recent star formation histories has been well tested, and now the major challenge is to build a large database of suitable observatio…
Phase diversity restoration of sunspot images. II. Dynamics around a decaying sunspot
Roudier, Th.; Muller, R.; Márquez, I. +2 more
Two time series, taken simultaneously in the G-band and in white-light, and corrected for telescope aberrations and turbulence perturbations using the method of phase diversity, are employed to study the motions of granules and G-band bright points (GBPs) in the moat of an old regular sunspot. Local correlation tracking and feature tracking have b…
Overtones of silicate and aluminate minerals and the 5-8 µm ice bands of deeply embedded objects
Hofmeister, A. M.; Bowey, J. E.
The distinct patterns, relatively low intensities and peak positions of overtone-combination bands of silicates and oxides suggest that the 5-8 µm spectral region can provide clues for the dust composition when near optically thick conditions exist for the 10-µm silicate feature. We present 1000-2500 cm-1 room-temperature la…
Prometheus and Pandora: masses and orbital positions during the Cassini tour
French, Richard G.; Sicardy, Bruno; Renner, Stéfan
Hubble Space Telescope ( HST) images of Prometheus and Pandora show longitude discrepancies of about 20° with respect to the Voyager ephemerides, with an abrupt change in mean motion at the end of 2000 (French et al., 2003, Icarus 162, 143-170; French and McGhee, 2003, Bull. Am. Astron. Soc. 34, 06.07). These discrepancies are anti-correlated and …
XMM-Newton detection of type I X-ray bursts in M 31
Pietsch, W.; Haberl, F.
We searched for X-ray bursts in XMM-Newton archival data of X-ray sources in
Host Galaxy Evolution in Radio-Loud Active Galactic Nuclei
Urry, C. Megan; O'Dowd, Matthew
We investigate the luminosity evolution of the host galaxies of radio-loud active galactic nuclei (AGNs) through Hubble Space Telescope imaging of 72 BL Lac objects, including new Space Telescope Imaging Spectrograph (STIS) imaging of nine z>0.6 BL Lacs. With their intrinsically low accretion rates and their strongly beamed jets, BL Lac objects…
The ground calibration setup of OMEGA and VIRTIS experiments: description and performances
Langevin, Yves; Gondet, Brigitte; Bonello, Guillaume +4 more
Hyperspectral imagery is an essential technique for remote sensing of surfaces and atmospheres of planetary objects. However, given the instrumental complexity of coupling imaging and spectroscopy, in particular in the infrared, an in-depth ground calibration is mandatory to enable an unbiased and optimized data reduction. This paper presents the …