2,604 research outputs found
Andosoles canarios : 4. Intergrados andosol-tierra parda oligotrofica : caracteristicas mineralogicas, interpretacion y clasificacion
Andosoles canarios : 8. Andosoles poco diferenciados, vitricos, fuertemente desaturados : caracteristicas mineralogicas, interpretacion y clasificacion
Andosoles canarios : 6. Dystrandepts : caracteristicas mineralogicas, interpretacion y clasificacion
On the Reliability of Cross Correlation Function Lag Determinations in Active Galactic Nuclei
Many AGN exhibit a highly variable luminosity. Some AGN also show a
pronounced time delay between variations seen in their optical continuum and in
their emission lines. In effect, the emission lines are light echoes of the
continuum. This light travel-time delay provides a characteristic radius of the
region producing the emission lines. The cross correlation function (CCF) is
the standard tool used to measure the time lag between the continuum and line
variations. For the few well-sampled AGN, the lag ranges from 1-100 days,
depending upon which line is used and the luminosity of the AGN. In the best
sampled AGN, NGC 5548, the H_beta lag shows year-to-year changes, ranging from
about 8.7 days to about 22.9 days over a span of 8 years. In this paper it is
demonstrated that, in the context of AGN variability studies, the lag estimate
using the CCF is biased too low and subject to a large variance. Thus the
year-to-year changes of the measured lag in NGC 5548 do not necessarily imply
changes in the AGN structure. The bias and large variance are consequences of
finite duration sampling and the dominance of long timescale trends in the
light curves, not due to noise or irregular sampling. Lag estimates can be
substantially improved by removing low frequency power from the light curves
prior to computing the CCF.Comment: To appear in the PASP, vol 111, 1999 Nov; 37 pages; 10 figure
Ultraviolet and optical properties of Narrow-Line Seyfert 1 galaxies
Narrow Line Seyfert 1 (NLS1) galaxies are remarkable for their extreme
continuum and emission line properties which are not well understood. New
results bearing on the spectroscopic characteristics of these objects are
presented here, with the aim of establishing their typical ultraviolet and
optical spectral behavior. We employ HST observations of 22 NLS1s, which
represent a substantial improvement over previous work in terms of data quality
and sample size. High signal-to-noise NLS1 composite spectra are constructed,
allowing accurate measurements of the continuum shape and the strengths,
ratios, and widths for lines, including weak features which are barely
identifiable in other Active Galactic Nuclei (AGN) composites. We find that the
NLS1 sources have redder UV-blue continua than those typically measured in
other quasars and Seyferts. Objects with UV line absorption show redder
spectra, suggesting that dust is important in modifying the continuum shapes.
The data also permit a detailed investigation of the previously proposed link
between NLS1s and z >~ 4 quasars. Direct comparison of their composite spectra,
as well as a Principal Component Analysis, suggest that high-z QSOs do not show
a strong preference toward NLS1 behavior.Comment: 23 pages (incl. 9 figures, 4 tables), to appear in The Publications
of the Astronomical Society of the Pacifi
Circumstellar Emission from Type Ib and Ic Supernovae
The presumed Wolf-Rayet star progenitors of Type Ib/c supernovae have fast,
low density winds and the shock waves generated by the supernova interaction
with the wind are not expected to be radiative at typical times of observation.
The injected energy spectrum of radio emitting electrons typically has an
observed index p=3, which is suggestive of acceleration in cosmic ray dominated
shocks. The early, absorbed part of the radio light curves can be attributed to
synchrotron self-absorption, which leads to constraints on the magnetic field
in the emitting region and on the circumstellar density. The range of
circumstellar densities inferred from the radio emission is somewhat broader
than that for Galactic Wolf-Rayet stars, if similar efficiencies of synchrotron
emission are assumed in the extragalactic supernovae. For the observed and
expected ranges of circumstellar densities to roughly overlap, a high
efficiency of magnetic field production in the shocked region is required
(epsilon_B ~ 0.1). For the expected densities around a Wolf-Rayet star, a
nonthermal mechanism is generally required to explain the observed X-ray
luminosities of Type Ib/c supernovae. Although the inverse Compton mechanism
can explain the observed X-ray emission from SN 2002ap if the wind parameters
are taken from the radio model, the mechanism is not promising for other
supernovae unless the postshock magnetic energy density is much smaller than
the electron energy density. In some cases another mechanism is definitely
needed and we suggest that it is X-ray synchrotron emission in a case where the
shock wave is cosmic ray dominated so that the electron energy spectrum
flattens at high energy. More comprehensive X-ray observations of a Type Ib/c
supernova are needed to determine whether this suggestion is correct.Comment: 31 pages, 2 figures, ApJ, accepted, corrected typ
Probing the Ionizing Continuum of Narrow-Line Seyfert 1 Galaxies. I.Observational Results
We present optical spectra and emission-line ratios of 12 Narrow-Line Seyfert
1 (NLS1) galaxies that we observed to study the ionizing EUV continuum. A
common feature in the EUV continuum of active galactic nuclei is the big blue
bump (BBB), generally associated with thermal accretion disk emission. While
Galactic absorption prevents direct access to the EUV range, it can be mapped
by measuring the strength of a variety of forbidden optical emission lines that
respond to different EUV continuum regions. We find that narrow emission-line
ratios involving [OII]3727, Hbeta, [OIII]5007, [OI]6300, Halpha,[NII]6583, and
[SII]6716,6731 indicate no significant difference between NLS1s and Broad-Line
Seyfert 1 (BLS1) galaxies, which suggests that the spectral energy
distributions of their ionizing EUV - soft X-ray continua are similar. The
relative strength of important forbidden high ionization lines like [NeV]3426
compared to HeII4686 and the relative strength of [FeX]6374 appear to show the
same range as in BLS1 galaxies. However, a trend of weaker
F([OI]6300)/F(Halpha) emission-line ratios is indicated for NLS1s compared to
BLS1s. To recover the broad emission-line profiles we used Gaussian components.
This approach indicates that the broad Hbeta profile can be well described with
a broad component (FWHM = 3275 +- 800 km/s) and an intermediate broad component
(FWHM = 1200 +- 300 km/s). The width of the broad component is in the typical
range of normal BLS1s. The emission-line flux that is associated with the broad
component in these NLS1s amounts to at least 60% of the total flux. Thus it
dominates the total line flux, similar to BLS1 galaxies.Comment: 34 pages, 9 figures. accepted for publication in the
Astrophys.Journa
Unveiling the nature of the highly obscured AGN in NGC5643 with XMM-Newton
We present results from an XMM-Newton observation of the nearby Seyfert 2
galaxy NGC5643. The nucleus exhibits a very flat X-ray continuum above 2 keV,
together with a prominent K-alpha fluorescent iron line. This indicates heavy
obscuration. We measure an absorbing column density N_H in the range 6-10 x
10^{23} atoms/cm/cm, either directly covering the nuclear emission, or covering
its Compton-reflection. In the latter case, we might be observing a rather
unusual geometry for the absorber, whereby reflection from the inner far side
of a torus is in turn obscured by its near side outer atmosphere. The nuclear
emission might be then either covered by a Compton-thick absorber, or
undergoing a transient state of low activity. A second source (christened "X-1"
in this paper) at the outskirts of NGC5643 optical surface outshines the
nucleus in X-rays. If belonging to NGC5643, it is the third brightest (L_X ~ 4
x 10^{40} erg/s) known Ultra Luminous X-ray source. Comparison with past large
aperture spectra of NGC 5643 unveils dramatic X-ray spectral changes above 1
keV. We interpret them as due to variability of the active nucleus and of
source X-1 intrinsic X-ray powers by a factor >10 and 5, respectively.Comment: 11 LATEX pages, 12 figures, to appear in Monthly Notices of the Royal
Astronomical Societ
Probing Spectroscopic Variability of Galaxies & Narrow-Line Active Galactic Nuclei in the Sloan Digital Sky Survey
Under the unified model for active galactic nuclei (AGNs), narrow-line (Type
2) AGNs are, in fact, broad-line (Type 1) AGNs but each with a heavily obscured
accretion disk. We would therefore expect the optical continuum emission from
Type 2 AGN to be composed mainly of stellar light and non-variable on the
time-scales of months to years. In this work we probe the spectroscopic
variability of galaxies and narrow-line AGNs using the multi-epoch data in the
Sloan Digital Sky Survey (SDSS) Data Release 6. The sample contains 18,435
sources for which there exist pairs of spectroscopic observations (with a
maximum separation in time of ~700 days) covering a wavelength range of
3900-8900 angstrom. To obtain a reliable repeatability measurement between each
spectral pair, we consider a number of techniques for spectrophotometric
calibration resulting in an improved spectrophotometric calibration of a factor
of two. From these data we find no obvious continuum and emission-line
variability in the narrow-line AGNs on average -- the spectroscopic variability
of the continuum is 0.07+/-0.26 mag in the g band and, for the emission-line
ratios log10([NII]/Halpha) and log10([OIII]/Hbeta), the variability is
0.02+/-0.03 dex and 0.06+/-0.08 dex, respectively. From the continuum
variability measurement we set an upper limit on the ratio between the flux of
varying spectral component, presumably related to AGN activities, and that of
host galaxy to be ~30%. We provide the corresponding upper limits for other
spectral classes, including those from the BPT diagram, eClass galaxy
classification, stars and quasars.Comment: AJ accepte
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