Search Publications
The Narrow-Line Region of the Seyfert 2 Galaxy Mrk 78: An Infrared View
Pérez García, A. M.; Acosta-Pulido, J. A.; Ramos Almeida, C. +3 more
We report near-infrared spectroscopic data for the Seyfert 2 galaxy Mrk 78, taken with the LIRIS near-infrared camera/spectrometer at the William Herschel Telescope (WHT). The long-slit spectra clearly show extended emission. The resolution and depth of the near-infrared spectra allow the examination of its morphology and ionization regions, and a…
Interstellar abundances in the neutral and ionized gas of NGC 604
Kunth, D.; Lebouteiller, V.; Vidal-Madjar, A. +5 more
Aims.We present FUSE spectra of the giant H ii region NGC 604 in the spiral galaxy M 33. Chemical abundances are tentatively derived from far-UV absorption lines and compared to those derived from optical emission lines.
Methods: .Absorption lines from neutral hydrogen and heavy elements were observed against the continuum provided by the youn…
XMM-Newton observation of the bright Seyfert 1 galaxy, MCG+8-11-11
de Rosa, A.; Perola, G. C.; Bianchi, S. +2 more
We report on the XMM-Newton observation of the bright Seyfert 1 galaxy, MCG+8-11-11. Data from the EPIC/p-n camera, the Reflection Gratings Spectrometers (RGS), and the Optical Monitor (OM) were analyzed. The p-n spectrum was fitted well by a power law, a spectrally unresolved Fe Kα line, a Compton reflection component (whose high value, when comp…
Spitzer Observations of V838 Monocerotis: Detection of a Rare Infrared Light Echo
Banerjee, D. P. K.; Misselt, K. A.; Su, K. Y. L. +1 more
We present Spitzer observations of the unusual variable V838 Monocerotis. Extended emission is detected around the object at 24, 70, and 160 µm. The extended infrared emission is strongly correlated spatially with the HST optical light echo images taken at a similar epoch. We attribute this diffuse nebulosity to an infrared light echo caused…
An Internet Database of Ultraviolet Continuum Light Curves for Seyfert Galaxies
Dunn, Jay P.; Crenshaw, D. Michael; Farrington, Chris +3 more
Using the Multimission Archive at STScI (MAST), we have extracted spectra and determined continuum light curves for 175 Seyfert galaxies that have been observed with the International Ultraviolet Explorer and the Faint Object Spectrograph on the Hubble Space Telescope. To obtain the light curves as a function of Julian Date, we used fixed bins in …
Global Response of Martian Plasma Environment to an Interplanetary Structure: From Ena and Plasma Observations at Mars
Barabash, S.; Lundin, R.; Futaana, Y. +4 more
As a part of the global plasma environment study of Mars and its response to the solar wind, we have analyzed a peculiar case of the subsolar energetic neutral atom (ENA) jet observed on June 7, 2004 by the Neutral Particle Detector (NPD) on board the Mars Express satellite. The "subsolar ENA jet" is generated by the interaction between the solar …
Multiwavelength Observations of the BL Lacertae Object PKS 2155-304 with XMM-Newton
Maraschi, L.; Treves, A.; Celotti, A. +3 more
The optical/UV and X-ray instruments on board XMM-Newton provide an excellent opportunity to perform simultaneous observations of violently variable objects over a broad wavelength range. The UV- and X-ray-bright BL Lac object PKS 2155-304 has been observed repeatedly with XMM-Newton about twice per year. In this paper, we present a detailed analy…
The K-band properties of Seyfert 2 galaxies
Zhao, Y.; Melnick, J.; Gu, Q. +1 more
Aims. It is well known that the [O iii]λ5007 emission line and hard X-ray (2-10 keV) luminosities are good indicators of AGN activities and that the near and mid-infrared emission of AGN originates from re-radiation of dusty clouds heated by the UV/optical radiation from the accretion disk. In this paper we present a study of the near-infrared K-b…
First high spectral resolution VUV full-Sun spectrum compared to cool stars
Peter, Hardi
This paper reports the first full-Sun vacuum ultraviolet (VUV) emission line profile originating from the transition region from the chromosphere to the corona. It is based on a raster scan of the whole solar disk using SUMER/SOHO. The full-Sun spectrum has a spectral resolution which allows an investigation of details in the line profile as well …
An INTEGRAL hard X-ray survey of the Large Magellanic Cloud
Götz, D.; Mereghetti, S.; Belloni, T. +2 more
Two observation campaigns in 2003 and 2004 with the INTEGRAL satellite have provided the first sensitive survey of the Large Magellanic Cloud with an imaging instrument in the hard X-ray range (15 keV-10 MeV). The high energy flux and long-term variability of the black hole candidate LMC X-1 was measured for the first time without contamination by…