1,201 research outputs found

    XMM-Newton observations of SDSS J143030.22−-001115.1: an unusually flat spectrum AGN

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    We present XMM observations of the AGN SDSS 1430-0011. The low S/N spectrum of this source obtained in a snap shot Chandra observation showed an unusually flat continuum. With the follow up XMM observations we find that the source spectrum is complex; it either has an ionized absorber or a partially covering absorber. The underlying power-law is in the normal range observed for AGNs. The low luminosity of the source during Chandra observations can be understood in terms of variations in the absorber properties. The X-ray and optical properties of this source are such that it cannot be securely classified as either a narrow line Seyfert 1 or a broad line Seyfert 1 galaxy.Comment: Submitted to A

    Jet emission in NGC1052 at radio, optical, and X-ray frequencies

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    We present a combined radio, optical, and X-ray study of the nearby LINER galaxy NGC 1052. Data from a short (2.3 ksec) {\it CHANDRA} observation of NGC 1052 reveal the presence of various jet-related X-ray emitting regions, a bright compact core and unresolved knots in the jet structure as well as an extended emitting region inside the galaxy well aligned with the radio synchrotron jet-emission. The spectrum of the extended X-ray emission can best be fitted with a thermal model with kT=(0.4−0.5)kT = (0.4-0.5) keV, while the compact core exhibits a very flat spectrum, best approximated by an absorbed power-law with NH=(0.6−0.8)×1022cm−2N_{\rm H} = (0.6-0.8) \times 10^{22} {\rm cm^{-2}}. We compare the radio structure to an optical ``structure map'' from a {\it Hubble Space Telescope} ({\it HST}) observation and find a good positional correlation between the radio jet and the optical emission cone. Bright, compact knots in the jet structure are visible in all three frequency bands whose spectrum is inconsistent with synchrotron emission.Comment: 8 pages, 5 figures (figure 2 in color), image resolution degraded wrt journal version, needs aa.cls. Accepted for publication in A&

    Detection of moisture and moisture related phenomena from Skylab

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    There are no author-identified significant results in this report

    Detection of moisture and moisture related phenomena from Skylab

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    The author has identified the following significant results. Data from five Skylab passes were combined to give a composite relationship between the S194 antennae temperature and soil moisture content in the surface to one inch layer. The five data sets were comparable and resulted in a correlation coefficient of -0.97. The regression equation was used to predict soil moisture content across the United States for one particular pass on August 5, 1973

    Mapping of snow cover and freeze thaw line

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    There are no author-identified significant results in this report
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