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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…
The magnetic Bp star 36 Lyncis. I. Magnetic and photospheric properties
Petit, P.; Smith, M. A.; Wade, G. A. +8 more
Aims.This paper reports the photospheric, magnetic and circumstellar gas characteristics of the magnetic B8p star 36 Lyncis (HD 79158).
Methods: .Using archival data and new polarised and unpolarised high-resolution spectra, we redetermine the basic physical properties, the rotational period and the geometry of the magnetic field, and the phot…
The Formation Epoch of Early-Type Galaxies in the z ~ 0.9 Cl 1604 Supercluster
Ford, H. C.; Demarco, R.; Menanteau, F. +12 more
We analyze the cluster color-magnitude relation (CMR) for early-type galaxies in two of the richer clusters in the z~0.9 supercluster system to derive average ages and formation redshifts for the early-type galaxy population. Both clusters were observed with the Advanced Camera for Surveys on board the Hubble Space Telescope through the F606W and …
Imaging extended sources with coded mask telescopes: application to the INTEGRAL IBIS/ISGRI instrument
Terrier, R.; Renaud, M.; Lebrun, F. +4 more
Context: .In coded mask techniques, reconstructed sky images are pseudo-images: they are maps of the correlation between the image recorded on a detector and an array derived from the coded mask pattern.
Aims: .The INTEGRAL /IBIS telescope provides images where the flux of each detected source is given by the height of the local peak in the co…