1,378 research outputs found
The optical-ultraviolet continuum of Seyfert 2 galaxies
This paper aims to understand the continuum of Seyfert 2 galaxies. By fitting
the single galaxies in the sample of Heckman et al. (1995) with composite
models (shock+ photoionization from the active center), we show that five main
components characterize the SED of the continuum. Shocks play an important role
since they produce a high temperature zone where soft X-rays are emitted.
We show that in the optical-UV range, the slope of the NLR emission
reproduces the observed values, and may be the main component of the
featureless continuum. The presence of star forming regions cannot be excluded
in the circumnuclear region of various Seyfert galaxies. An attempt is made to
find their fingerprints in the observed AGN spectra. Finally, it is
demonstrated that multi-cloud models are necessary to interpret the spectra of
single objects, even in the global investigation of a sample of galaxies.Comment: 26 pages, LaTeX (including 5 Tables) + 17 PostScript figures. To
appear in "The Astrophysical Journal
The Fornax Spectroscopic Survey: The Number of Unresolved Compact Galaxies
We describe a sample of thirteen bright (18.5<Bj<20.1) compact galaxies at
low redshift (0.05<z<0.21) behind the Fornax Cluster. These galaxies are
unresolved on UK Schmidt sky survey plates, so would be missing from most
galaxy catalogs compiled from this material. The objects were found during
initial observations of The Fornax Spectroscopic Survey. This project is using
the Two-degree Field spectrograph on the Anglo-Australian Telescope to obtain
spectra for a complete sample of all 14000 objects, stellar and non-stellar,
with 16.5<Bj<19.7, in a 12 square degree area centered on the Fornax cluster of
galaxies. The surface density of compact galaxies with magnitudes 16.5<Bj<19.7
is 7+/-3 /sq.deg., representing 2.8+/-1.6% of all local (z<0.2) galaxies to
this limit. There are 12+/-3 /sq.deg. with 16.5<Bj<20.2. They are luminous
(-21.5<Mb<-18.0, for H0=50 km/s/mpc) and most have strong emission lines (H
alpha equivalent widths of 40-200 A) and small sizes typical of luminous HII
galaxies and compact narrow emission line galaxies. Four out of thirteen have
red colors and early-type spectra, so are unlikely to have been detected in any
previous surveys.Comment: LaTeX source; 5 pages including 3 figures; uses emulateapj.st
A Quantitative Evaluation of the Galaxy Component of COSMOS and APM Catalogs
We have carried out an independent quantitative evaluation of the galaxy
component of the "COSMOS/UKST Southern Sky Object Catalogue" (SSC) and the
"APM/UKST J Catalogue" (APM). Using CCD observations our results corroborate
the accuracy of the photometry of both catalogs, which have an overall
dispersion of about 0.2 mag in the range 17 <= b_J <= 21.5. The SSC presents
externally calibrated galaxy magnitudes that follow a linear relation, while
the APM instrumental magnitudes of galaxies, only internally calibrated by the
use of stellar profiles, require second-order corrections. The completeness of
both catalogs in a general field falls rapidly fainter than b_J = 20.0, being
slightly better for APM. The 90% completeness level of the SSC is reached
between b_J = 19.5 and 20.0, while for APM this happens between b_J = 20.5 and
21.0. Both SSC and APM are found to be less complete in a galaxy cluster field.
Galaxies misclassified as stars in the SSC receive an incorrect magnitude
because the stellar ones take saturation into account besides using a different
calibration curve. In both cases, the misclassified galaxies show a large
diversity of colors that range from typical colors of early-types to those of
blue star-forming galaxies. A possible explanation for this effect is that it
results from the combination of low sampling resolutions with properties of the
image classifier for objects with characteristic sizes close to the
instrumental resolution. We find that the overall contamination by stars
misclassified as galaxies is < 5% to b_J = 20.5, as originally estimated for
both catalogs. Although our results come from small areas of the sky, they are
extracted from two different plates and are based on the comparison with two
independent datasets.Comment: 14 pages of text and tables, 8 figures; to be published in the
Astronomical Journal; for a single postscript version file see
ftp://danw.on.br/outgoing/caretta/caretta.p
Testing the Hubble Law with the IRAS 1.2 Jy Redshift Survey
We test and reject the claim of Segal et al. (1993) that the correlation of
redshifts and flux densities in a complete sample of IRAS galaxies favors a
quadratic redshift-distance relation over the linear Hubble law. This is done,
in effect, by treating the entire galaxy luminosity function as derived from
the 60 micron 1.2 Jy IRAS redshift survey of Fisher et al. (1995) as a distance
indicator; equivalently, we compare the flux density distribution of galaxies
as a function of redshift with predictions under different redshift-distance
cosmologies, under the assumption of a universal luminosity function. This
method does not assume a uniform distribution of galaxies in space. We find
that this test has rather weak discriminatory power, as argued by Petrosian
(1993), and the differences between models are not as stark as one might expect
a priori. Even so, we find that the Hubble law is indeed more strongly
supported by the analysis than is the quadratic redshift-distance relation. We
identify a bias in the the Segal et al. determination of the luminosity
function, which could lead one to mistakenly favor the quadratic
redshift-distance law. We also present several complementary analyses of the
density field of the sample; the galaxy density field is found to be close to
homogeneous on large scales if the Hubble law is assumed, while this is not the
case with the quadratic redshift-distance relation.Comment: 27 pages Latex (w/figures), ApJ, in press. Uses AAS macros,
postscript also available at
http://www.astro.princeton.edu/~library/preprints/pop682.ps.g
Community Partnerships for Older Adults: A Case Study
Over the past several decades, federal policy has made states and communities increasingly more responsible for providing long-term care for older adults. The Community Partnerships for Older Adults, a national program of The Robert Wood Johnson Foundation, saw this as an opportunity to explore new, sustainable ways to meet current and future needs for community-based long-term care. This initiative focuses on collaborative organizational partnerships, a distinctive philosophy of teaching and learning through the exchange of experience between communities, and program learning focusing on known factors promoting organizational sustainability. Using principles that emphasize the development of social capital and collective efficacy, the authors present a case study of the early experiences of this initiative to address the challenges inherent in meeting the growing supportive service needs of older adults. The implications of this multi-site community intervention for social work education and practice in aging are discussed
General pseudoadditivity of composable entropy prescribed by existence of equilibrium
The concept of composability states that entropy of the total system composed
of independent subsystems is a function of entropies of the subsystems. Here,
the most general pseudoadditivity rule for composable entropy is derived based
only on existence of equilibrium.Comment: 12 page
Fast Edge Corrected Measurement of the Two-Point Correlation Function and the Power Spectrum
We present two related techniques to measure the two-point correlation
function and the power spectrum with edge correction in any spatial dimensions.
The underlying algorithm uses fast Fourier transforms for calculating the
two-point function with an heuristically weighted edge corrected estimator.
Once the correlation function is measured, we estimate the power spectrum via
numerical integration of the Hankel transform connecting the two. We introduce
an efficient numerical technique based on Gauss-Bessel-quadrature and double
exponential transformation. This, combined with our, or any similar, two-point
function estimator leads to a novel edge corrected estimator for power spectra.
The pair of techniques presented are the Euclidean analogs of those developed
and widely used in cosmic microwave background research for spherical maps.Comment: 4 pages, 2 figures, submitted to ApJ
Emission Line Galaxies in the STIS Parallel Survey I: Observations and Data Analysis
In the first three years of operation STIS obtained slitless spectra of
approximately 2500 fields in parallel to prime HST observations as part of the
STIS Parallel Survey (SPS). The archive contains almost 300 fields at high
galactic latitude (|b|>30) with spectroscopic exposure times greater than 3000
seconds. This sample contains 220 fields (excluding special regions and
requiring a consistent grating angle) observed between 6 June 1997 and 21
September 2000, with a total survey area of about 160 square arcminutes. At
this depth, the SPS detects an average of one emission line galaxy per three
fields. We present the analysis of these data, and the identification of 131
low to intermediate redshift galaxies detected by optical emission lines. The
sample contains 78 objects with emission lines that we infer to be redshifted
[OII]3727 emission at 0.43<z<1.7. The comoving number density of these objects
is comparable to that of H-alpha emitting galaxies in the NICMOS parallel
observations. One quasar and three probable Seyfert galaxies are detected. Many
of the emission-line objects show morphologies suggestive of mergers or
interactions. The reduced data are available upon request from the authors.Comment: 58 preprint pages, including 26 figures; accepted for publication in
ApJ
Superconducting Fluxon Pumps and Lenses
We study stochastic transport of fluxons in superconductors by alternating
current (AC) rectification. Our simulated system provides a fluxon pump,
"lens", or fluxon "rectifier" because the applied electrical AC is transformed
into a net DC motion of fluxons. Thermal fluctuations and the asymmetry of the
ratchet channel walls induce this "diode" effect, which can have important
applications in devices, like SQUID magnetometers, and for fluxon optics,
including convex and concave fluxon lenses. Certain features are unique to this
novel two-dimensional (2D) geometric pump, and different from the previously
studied 1D ratchets.Comment: Phys. Rev. Lett. 83, in press (1999); 4 pages, 5 .gif figures;
figures also available at http://www-personal.engin.umich.edu/~nori/ratche
Disorder Induced Diffusive Transport In Ratchets
The effects of quenched disorder on the overdamped motion of a driven
particle on a periodic, asymmetric potential is studied. While for the
unperturbed potential the transport is due to a regular drift, the quenched
disorder induces a significant additional chaotic ``diffusive'' motion. The
spatio-temporal evolution of the statistical ensemble is well described by a
Gaussian distribution, implying a chaotic transport in the presence of quenched
disorder.Comment: 10 pages, 4 EPS figures; submitted to Phys. Rev. Letter
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