1,201 research outputs found
XMM-Newton observations of SDSS J143030.22001115.1: an unusually flat spectrum AGN
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
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 keV, while the compact
core exhibits a very flat spectrum, best approximated by an absorbed power-law
with . 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
There are no author-identified significant results in this report
Detection of moisture and moisture related phenomena from Skylab
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
There are no author-identified significant results in this report
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