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Molecular and ionized gas in the tidal tail in Stephan's Quintet
Duc, P. -A.; Braine, J.; Charmandaris, V. +3 more
We have mapped with the IRAM interferometer at Plateau de Bure (PdBI) the 12CO emission towards intergalactic star forming regions located in the tidal tail stemming from NGC 7319, in the Stephan's Quintet compact group of galaxies. The 13CO emission of the same region was observed with the IRAM 30 m telescope and optical spe…
Reconsidering the Origin of the 21 Micron Feature: Oxides in Carbon-rich Protoplanetary Nebulae?
Mutschke, H.; Posch, Th.; Andersen, A.
The origin of the so-called 21 µm feature that is especially prominent in the spectra of some carbon-rich protoplanetary nebulae (PPNs) is the matter of a lively debate. A large number of potential band carriers have been presented and discarded within the past decade. This paper gives an overview of the problems related to the hitherto prop…
Markarian 1239: A Highly Polarized Narrow-Line Seyfert 1 Galaxy with a Steep X-Ray Spectrum and Strong Ne IX Emission
Komossa, S.; Grupe, D.; Mathur, S.
We report the results of an XMM-Newton observation of the narrow-line Seyfert 1 galaxy Mrk 1239. This optically highly polarized AGN has one of the steepest X-ray spectra found in AGNs, with αX=+3.0 based on ROSAT PSPC data. The XMM-Newton EPIC pn and MOS data confirm this steep X-ray spectrum. The pn data are best fitted by a power law…
Jovian auroral spectroscopy with FUSE: analysis of self-absorption and implications for electron precipitation
Feldman, P. D.; Moos, H. W.; Roueff, E. +12 more
High-resolution ( ∼0.22 Å) spectra of the north jovian aurora were obtained in the 905-1180 Å window with the Far Ultraviolet Spectroscopic Explorer (FUSE) on October 28, 2000. The FUSE instrument resolves the rotational structure of the H 2 spectra and the spectral range allows the study of self-absorption. Below 1100 Å, transitions co…
Detecting Outflows from Cataclysmic Variables in the Optical
Honeycutt, R. K.; Kafka, S.
Cataclysmic variables (CVs) often show evidence of bipolar winds that carry away mass and angular momentum, likely affecting the evolution of the system. For the most part, it has only been possible to study such winds by means of the P Cygni profiles seen in space-UV resonance lines. We demonstrate that optical P Cygni profiles in two He I lines …
XMM-Newton observations of seven soft X-ray excess quasi-stellar objects
Schartel, N.; O'Brien, P. T.; Page, K. L. +1 more
XMM-Newton observations of seven quasi-stellar objects (QSOs) are presented and the EPIC spectra analysed. Five of the active galactic nuclei (AGN) show evidence for Fe Kα emission, with three being slightly better fitted by lines of finite width; at the 99 per cent level they are consistent with being intrinsically narrow, though. The broad-band …
An XMM-Newton Observation of the Seyfert 1 Galaxy 1H 0419-577 in an Extreme Low State
O'Brien, P. T.; Reeves, J. N.; Page, K. L. +1 more
Previous observations of the luminous Seyfert 1 galaxy 1H 0419-577 have found its X-ray spectrum to range from that of a typical Seyfert 1 galaxy with a 2-10 keV power-law index of Γ~1.9 to a much flatter power law of Γ~1.5 or less. We report here a new XMM-Newton observation that allows the low-state spectrum to be studied in much greater detail …
XMM-Newton observations of the ultraluminous nuclear X-ray source in M 33
Rodriguez, J.; Foschini, L.; Ho, L. C. +5 more
We present observations with XMM-Newton of M 33 X-8, the ultraluminous X-ray source (L0.5-10 keV ≈ 2× 1039 erg/s) closest to the centre of the galaxy. The best-fit model is similar to the typical model of Galactic black holes in very high state. Comparison with previous observations indicates that the source is still in a ver…
Dust and Ionized Gas in Nine Nearby Early-Type Galaxies Imaged with the Hubble Space Telescope Advanced Camera for Surveys
Ford, H. C.; Menanteau, F.; Illingworth, G. D. +6 more
We present V and I continuum images and Hα+[N II] maps of nine early-type galaxies observed with the Wide Field Channel of the Advanced Camera for Surveys on the Hubble Space Telescope. Dust and ionized gas are detected in all galaxies. The optical nebulae are primarily concentrated on the nuclei and extend out to radii of a few hundred parsecs in…
Optical Spectroscopy of K-Selected Extremely Red Galaxies
Soifer, B. T.; Yan, Lin; Thompson, David
We have obtained spectroscopic redshifts for 24 sources from a sample of bright, K-selected extremely red objects (EROs) using the Keck I Telescope. These EROs have high-resolution morphologies from the Hubble Space Telescope and were selected with a median Ks magnitude of 18.7 and F814W-Ks>4 mag (Yan & Thompson 2003).…