218 research outputs found
A new deep SCUBA survey of gravitationally lensing clusters
We have conducted a new deep SCUBA survey, which has targetted 12 lensing
galaxy clusters and one blank field. In this survey we have detected several
sub-mJy sources after correcting for the gravitational lensing by the
intervening clusters. We here present the preliminary results and point out two
highlights.Comment: 4 pages, 2 figures, "Multiwavelength Cosmology" Mykonos, June 2003,
conference proceeding
The Kuiper Belt and Other Debris Disks
We discuss the current knowledge of the Solar system, focusing on bodies in
the outer regions, on the information they provide concerning Solar system
formation, and on the possible relationships that may exist between our system
and the debris disks of other stars. Beyond the domains of the Terrestrial and
giant planets, the comets in the Kuiper belt and the Oort cloud preserve some
of our most pristine materials. The Kuiper belt, in particular, is a
collisional dust source and a scientific bridge to the dusty "debris disks"
observed around many nearby main-sequence stars. Study of the Solar system
provides a level of detail that we cannot discern in the distant disks while
observations of the disks may help to set the Solar system in proper context.Comment: 50 pages, 25 Figures. To appear in conference proceedings book
"Astrophysics in the Next Decade
The torsion of a finite quasigroup quandle is annihilated by its order
We prove that if Q is a finite quasigroup quandle, then |Q| annihilates the
torsion of its homology. It is a classical result in reduced homology of finite
groups that the order of a group annihilates its homology. From the very
beginning of the rack homology (between 1990 and 1995) the analogous result was
suspected. The first general results in this direction were obtained
independently about 2001 by R.A.Litherland and S.Nelson, and P.Etingof and
M.Grana. In Litherland-Nelson paper it is proven that if (Q;*) is a finite
homogeneous rack (this includes quasigroup racks) then the torsion of homology
is annihilated by |Q|^n. In Etingof-Grana paper it is proven that if (X;A) is a
finite rack and N=|G^0_Q| is the order of a group of inner automorphisms of Q,
then only primes which can appear in the torsion of homology are those dividing
N (the case of connected Alexander quandles was proven before by T.Mochizuki).
The result of Litherland-Nelson is generalized by Niebrzydowski and Przytycki
and in particular, they prove that the torsion part of the homology of the
dihedral quandle R_3 is annihilated by 3. In Niebrzydowski-Przytycki paper it
is conjectured that for a finite quasigroup quandle, torsion of its homology is
annihilated by the order of the quandle. The conjecture is proved by T.Nosaka
for finite Alexander quasigroup quandles. In this paper we prove the conjecture
in full generality. For this version, we rewrote the Section 3 totally and
introduced the concept of the precubic homotopy. In Section 2, the main
addition is Corollary 2.2 which summarizes identities observed in the proof of
the main theorem as we use it later in Section 3.Comment: 13 pages, 1 figure; accepted for publication in Journal of Pure and
Applied Algebr
Using membrane computing for obtaining homology groups of binary 2D digital images
Membrane Computing is a new paradigm inspired from cellular communication. Until now, P systems have been used in research areas like modeling chemical process, several ecosystems, etc. In this paper, we apply P systems to Computational Topology within the context of the Digital Image. We work with a variant of P systems called tissue-like P systems to calculate in a general maximally parallel manner the homology groups of 2D images. In fact, homology computation for binary pixel-based 2D digital images can be reduced to connected component labeling of white and black regions. Finally, we use a software called Tissue Simulator to show with some examples how these systems wor
The Vega debris disc: A view from Herschel
We present five band imaging of the Vega debris disc obtained using the Herschel Space Observatory. These data span a wavelength range of 70-500 mu m with full-width half-maximum angular resolutions of 5.6-36.9 ''. The disc is well resolved in all bands, with the ring structure visible at 70 and 160 mu m. Radial profiles of the disc surface brightness are produced, and a disc radius of 11 '' (similar to 85AU) is determined. The disc is seen to have a smooth structure thoughout the entire wavelength range, suggesting that the disc is in a steady state, rather than being an ephemeral structure caused by the recent collision of two large planetesimals
Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society
Erratum: "A Gravitational-wave Measurement of the Hubble Constant Following the Second Observing Run of Advanced LIGO and Virgo" (2021, ApJ, 909, 218)
[no abstract available
Search for Gravitational Waves Associated with Gamma-Ray Bursts Detected by Fermi and Swift during the LIGO-Virgo Run O3b
We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC-2020 March 27 17:00 UTC). We conduct two independent searches: A generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds no evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate. © 2022. The Author(s). Published by the American Astronomical Society
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