scholarly journals TYPHOON observations of the Lindsay-Shapley Ring

2011 ◽  
Vol 7 (S284) ◽  
pp. 180-182 ◽  
Author(s):  
Laura K. Sturch ◽  
Barry F. Madore

AbstractWe present the first results of the TYPHOON program on the ring galaxy AM 0644-741. TYPHOON is a program for producing highly resolved spectrophotometric data cubes with wavelength coverage ranging from [OII] 3727A to 7000A. Using the first results of TYPHOON we will show its efficacy in producing images and from that we will create velocity maps, one of the many uses of TYPHOON results. From this program we will deduce the motion of gas in the ring structure of AM 0644-741 to better understand how the galaxy has evolved to its present state.

1989 ◽  
Vol 6 (1) ◽  
pp. 1-12
Author(s):  
Taha Jabir Al Alwani

IntroductionCurrent developments and the many acute problems facing the MuslimUmmah, especially at the intellectual level, present a serious challenge toIslam. This is why an attempt to outline an intellectual Islamic alternativein thought and knowledge has never been so urgent and imperative. Thiwill, insha 'Allah, help in formulating a clear and coordinated policy withregard to cultural transformation based on firm principles and sound strategy.It is also hoped that this policy will lead to scientific findings.By way of introduction, I will give a brief description of the state ofknowledge and thought. and of the educational and cultural systems in thecontemporary Arab and Muslim world.The Present State of ThoughtWhen examining the present state of thought among the Muslim peoples.three basic approaches can be identified:• The first can be described as the traditionalist approach which,by and large, considers the "traditional'' thought of the Ummahto be self-sufficient and capable of being presented asit is or with very little alteration. This approach suggeststhat the Ummah's contemporary intellectual life can be formedand organized and that the structure of its civilization canbe built on this basis. This approach i often described asthe approach of authenticity.• The second approach considers contemporary Western thoughtand its world-view-its concepts of existence, of life and ofman-to be universal, without it a modern culture and civilizationcannot be built. This tendency maintains that Westernthought must be adopted in toto, and any consequent negativeaspects are the price that must be paid if a modern cultureand civilization are to be established. This view is oftendescribed as mcdemistic.• The third trend, or the eclectic approach, advocates yetanother view. It contends that one must select from traditionalthought what is most sound, and from "modern" contemporarythought that which one considers and proves tobe correct, and weld the two to form an intellectual structurethat will provide a guaranteed basis for achieving what isrequired.However, the traditional approach, in the manner it has been presentedand applied, did not help to prevent the Ummah from falling into Lhe stateof decline and failure from which it is still suffering. Likewise, Western thought,as it also is presented and applied, cannot protect the Ummah from its inherentadverse, harmful and even disastrous effects. The advocates of theeclectic selective approach have not yet presented the details of this proposedblend, let alone tried to put it into effect. All this is conducive to the widerangingquestion: Is the Umrnah going through a serious intellectual crisis;and . if so, what is the way out of it? ...


Author(s):  
Michael Ashdown

The present state of the law must now be treated as authoritatively set out by Lord Walker in Pitt v Holt, and to a lesser but still important extent by the earlier judgment of Lloyd LJ in the Court of Appeal in the same case. This chapter, however, is concerned with the earlier development of the Re Hastings-Bass doctrine. Its purpose is to establish the doctrinal legitimacy of the rule in Re Hastings-Bass as an aspect of the English law of trusts. Whilst this is primarily of academic and theoretical concern, in view of the Supreme Court’s reformulation of the law into its present shape, it is also of practical importance. In particular, the future application of the doctrine to novel situations will depend upon understanding the precise nature and scope of the rule propounded by the Supreme Court. That decision cannot simply be divorced from the many decided cases which preceded it, and from its place in the wider compass of the law of trusts.


Author(s):  
Jonathon Keats

Of the many challenges facing tourism in space, one of the least obvious is the problem of intergalactic monetary exchange. Far more pressing to the nascent industry are issues such as extraterrestrial transportation and gravity-free accommodations. Charles Simonyi’s twelve-day trip to the International Space Station in 2007 cost him $25 million, more than the budget of an average family vacation. Yet years before even the most optimistic technophiles expect space tourism to be more than a fifteen-minute suborbital joyride on Virgin Galactic, a currency has been established, initially trading on Travelex for $12.50. It’s called the quid. Quid is an acronym for “quasi-universal intergalactic denomination.” Of course it’s also an appropriation of British slang for the pound sterling, and it is this association with the common term for a familiar item that gives it resonance, an evocative word for a provocative concept. One might have expected the new space money to repurpose the official name of an existing currency. The British and French have preferred that strategy when they’ve colonized other countries, and even Douglas Adams, for all his creativity, fell upon the formula when he coined the Altairian dollar in The Hitchhiker’s Guide to the Galaxy. But colonization robs a place of its exoticism. And if space tourism has any purpose, it’s escapism in extremis. Unlike the pound or the dollar, the quid has no inherent allegiances. The word has also been used at various stages as slang for the shilling, the sovereign, and the guinea, as well as the euro and the old Irish punt. Even the origin is “obscure,” according to the Oxford English Dictionary, which cites a characteristic early use of the word in Thomas Shadwell’s Squire of Alsatia: “Let me equip thee with a Quid.” The 1688 publication date of Shadwell’s play overrules one popular folk etymology, which claims that quid is short for Quidhampton, location of a mill that produced paper money for the Bank of England. The Bank of England wasn’t established until 1694.


2000 ◽  
Vol 176 ◽  
pp. 157-160
Author(s):  
E. Antonello ◽  
L. Mantegazza ◽  
D. Fugazza ◽  
M. Bossi ◽  
S. Covino

AbstractA summary of the first results of a search for Cepheids in IC 1613 is reported along with a short discussion of the adopted technique, a comparison of the characteristics of Cepheid light curves in the Galaxy, Magellanic Clouds and IC 1613, and a possible application for a P–L relation derivation. First overtone Cepheids have been identified for the first time in a galaxy farther than the Magellanic Clouds.


2019 ◽  
Vol 35 (18) ◽  
pp. 3453-3460 ◽  
Author(s):  
Anastasia Tyryshkina ◽  
Nate Coraor ◽  
Anton Nekrutenko

Abstract Motivation One of the many technical challenges that arises when scheduling bioinformatics analyses at scale is determining the appropriate amount of memory and processing resources. Both over- and under-allocation leads to an inefficient use of computational infrastructure. Over allocation locks resources that could otherwise be used for other analyses. Under-allocation causes job failure and requires analyses to be repeated with a larger memory or runtime allowance. We address this challenge by using a historical dataset of bioinformatics analyses run on the Galaxy platform to demonstrate the feasibility of an online service for resource requirement estimation. Results Here we introduced the Galaxy job run dataset and tested popular machine learning models on the task of resource usage prediction. We include three popular forest models: the extra trees regressor, the gradient boosting regressor and the random forest regressor, and find that random forests perform best in the runtime prediction task. We also present two methods of choosing walltimes for previously unseen jobs. Quantile regression forests are more accurate in their predictions, and grant the ability to improve performance by changing the confidence of the estimates. However, the sizes of the confidence intervals are variable and cannot be absolutely constrained. Random forest classifiers address this problem by providing control over the size of the prediction intervals with an accuracy that is comparable to that of the regressor. We show that estimating the memory requirements of a job is possible using the same methods, which as far as we know, has not been done before. Such estimation can be highly beneficial for accurate resource allocation. Availability and implementation Source code available at https://github.com/atyryshkina/algorithm-performance-analysis, implemented in Python. Supplementary information Supplementary data are available at Bioinformatics online.


1979 ◽  
Vol 47 ◽  
pp. 337-346 ◽  
Author(s):  
N. R. Walborn

AbstractThe importance of maintaining the greatest possible independence of spectral classification from theoretical or other external information is emphasized anew, with reference to some historical discussions now seen with the benefit of hindsight. This ideal requirement applies equally to the development and to the application of a classification system, although in practice some well-established information may guide one’s intuition in the initial hypothetical formulation. The fundamental position of this principle in the MK approach to classification is a major reason for the value of its spectral types, and for its continuing success in uncovering new phenomena. The ability of a particular technique to produce interesting or useful results is surely the most significant criterion of its value, and from this viewpoint it appears that new techniques and methods will complement rather than replace traditional spectral classification. Finally, the unique importance at this time of applying both new and traditional methods to spectral classification in the Magellanic Clouds is stressed; they provide the only current opportunity for detailed spectroscopic examination of numerous stars in external systems. It is essential that large telescopes be utilized for this work so that the best attainable observational quality may be maintained, and the many fascinating phenomena revealed by spectral classification in the Galaxy can be comparatively investigated to the maximum extent praticable in the Magellanic Clouds


1983 ◽  
Vol 100 ◽  
pp. 23-26
Author(s):  
E. Brinks

The first results of a new high resolution 21-cm HI line survey of M31 made with the Westerbork Synthesis Radio Telescope are presented. Five areas were mapped, covering the galaxy except for the extreme northern and southern parts, at a resolution of δα × δδ × δV = 24″ × 36″ × 3.2 km s−1. The spatial resolution corresponds to 30 × 120 pc at the distance of M31. This is of the same order as the resolution at the distance of the center or our own galaxy given by a 25-m dish. Consequently the M31 survey is comparable to surveys of the Milky Way galaxy in wealth of detail as well as in amount of data (∼ 1 Gigabyte).


2019 ◽  
Vol 491 (2) ◽  
pp. 2057-2074 ◽  
Author(s):  
Emma K Lofthouse ◽  
Michele Fumagalli ◽  
Matteo Fossati ◽  
John M O’Meara ◽  
Michael T Murphy ◽  
...  

ABSTRACT We present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT), which targets 28 z > 3.2 quasars to investigate the connection between optically thick gas and galaxies at z ∼ 3–4. MAGG maps the environment of 52 strong absorption line systems at z ≳ 3, providing the first statistical sample of galaxies associated with gas-rich structures in the early Universe. In this paper, we study the galaxy population around a very metal poor gas cloud at z ≈ 3.53 towards the quasar J124957.23−015928.8. We detect three Lyα emitters within $\lesssim 200~\rm km~s^{-1}$ of the cloud redshift, at projected separations $\lesssim 185~\rm ~kpc$ (physical). The presence of star-forming galaxies near a very metal-poor cloud indicates that metal enrichment is still spatially inhomogeneous at this redshift. Based on its very low metallicity and the presence of nearby galaxies, we propose that the most likely scenario for this Lyman Limit System (LLS) is that it lies within a filament which may be accreting on to a nearby galaxy. Taken together with the small number of other LLSs studied with MUSE, the observations to date show a range of different environments near strong absorption systems. The full MAGG survey will significantly expand this sample and enable a statistical analysis of the link between gas and galaxies to pin down the origin of these diverse environments at z ≈ 3–4.


1985 ◽  
Vol 19 (1) ◽  
pp. 678-681
Author(s):  
Maarten Schmidt

In the past three years several surveys of optically selected quasars have been published. The Palomar Bright Quasar Survey (Schmift & Green 1983) covers 10,714 deg to a limiting magnitude varyinq with position in the sky, with an effective limiting magnitude B = 16.16. The survey lists 114 objects of which 92 are quasars with Mg < −23. All objects have redshifts less than 2.15 as they were selected for ultraviolet excess. Marshall et al. (1983) have extended the spectroscopic coverage of objects in the Braccesi field (AB) to B = 18.25. They also report first results in the deep Braccesi field (BF) to B = 19.2. Koo (1983) reports on a photometric and spectroscopic survey of quasars to B = 22.5 (see also Koo & Kron [1982]). The present state of quasar surveys is critically discussed by Smith (1983) in a very useful review.


1988 ◽  
Vol 108 ◽  
pp. 295-304
Author(s):  
Manorama Chilukuri ◽  
Robert V. Wagoner

Among the many historic opportunities provided by the recent supernova in the LMC is that to improve our understanding of the physical conditions in the neighborhood of supernova photospheres, even though 1987A was initially characterized by radial and time scales smaller (by a factor 5–10) than “standard” more luminous SNII. Two consequences of this understanding, which we shall focus on in this contribution, are (a) an estimate of the (frequency-dependent) location and thickness of the photosphere and (b) the only direct determination of the distance of the supernova (via the generalized Baade method). We find that the photosphere is sharp enough to allow the use of plane-parallel geometry in the calculation of the emergent continuum spectral flux, if we confine our attention to those epochs (temperature T ~ 5000−6000 K) at which hydrogen is recombining at the photosphere. We also find that the distance to this supernova is 43 ± 4 kpc. The reliability of this determination should improve when accurate spectrophotometric data for dates other than March 1 become available to us.


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