scholarly journals The formation of cD Halos: the case of NGC 3311 in the Hydra I Cluster

2009 ◽  
Vol 5 (H15) ◽  
pp. 86-86
Author(s):  
G. Ventimiglia ◽  
O. Gerhard ◽  
M. Arnaboldi
Keyword(s):  
Imaging Spectroscopy ◽  
Photometric Data ◽  
Spectroscopy Technique ◽  
The Core ◽  
V Band ◽  
North East ◽  
The North ◽  
The Galaxy ◽  
Cd Galaxies ◽  
Dynamical Simulations

We have studied the core of the Hydra I cluster, around its central cD galaxy, NGC 3311. We have analyzed the kinematics a sample of 60 intracluster planetary nebulae (PNs), detected using the multi-slit imaging spectroscopy technique (MSIS, Gerhard et al., 2005, Ventimiglia et al., 2008). PNs are good tracers of light (Coccato et al., 2009) and the MSIS allows to measure their velocities and positions at the same time. The histogram of the PN radial velocities presents several discrete components. We are comparing this result with ΛCDM hydro-dynamical simulations and other data in order to interpret it in the framework of the formation of extended halos around cD galaxies. V band photometric data around NGC 3311 have revealed the presence of an excess of light in the North-East part of the galaxy, which is spatially coincident with most of the PNs contributing to the reddest peak in the PNs LOSVD. We have measured, using Long-Slit data, the velocity of HCC26, a dwarf (DW) galaxy in the middle of the excess of light. The reddest peak in the PNs LOSVD is consistent both with the velocity of HCC 26 and of several other DWs in the same region. We are investigating the possibility that the light in excess has been stripped from these galaxies and now incorporated into the halo of NGC 3311.

STRucture and Evolution of the GAlaxy (STREGA): The case of Pal 3

2019 ◽  
Vol 14 (S351) ◽  
pp. 478-481
Author(s):  
M. I. Moretti ◽  
I. Musella ◽  
M. Marconi ◽  
V. Ripepi ◽  
R. Molinaro
Keyword(s):  
Time Series ◽  
Globular Cluster ◽  
Variable Stars ◽  
Rr Lyrae Stars ◽  
North East ◽  
The North ◽  
Rr Lyrae ◽  
The Galaxy ◽  
Lyrae Stars ◽  
Candidate Variable

AbstractIn the context of the STRucture and Evolution of the GAlaxy survey, we describe the preliminary results obtained for the fields around the globular cluster Pal 3 (about 2.75 square degrees), by exploiting the obtained g, r, i time series photometry. The final aim is to use variable stars as tools to verify and study the presence of streams around Pal 3. We found 20 candidate variable stars of which 7 RR Lyrae stars possibly belonging to Pal 3, also at large distance from the center. The distribution of the candidate RR Lyrae seems to confirm a preferential distribution in the north-east direction, confirming previous results in literature.

Some Romano-British Sculptures from Ancaster and Wilsford, Lincolnshire

1961 ◽  
Vol 41 (3-4) ◽  
pp. 229-231 ◽  
Author(s):  
S. S. Frere
Keyword(s):  
Fourteenth Century ◽  
Twelfth Century ◽  
The Other ◽  
Kind Permission ◽  
The Core ◽  
North East ◽  
The North ◽  
The Face

The purpose of this paper is to record three stones recently brought to my attention. The first was found about twenty years ago by Mr. Benjamin Wyles when digging a dyke in a field called the Long Liner near Slate House Farm, in the parish of Wilsford near Grantham. It is preserved in Wilsford church and is published by the kind permission of the Rector, the Rev. J. D. Smart. The other two, which are fragmentary, were found in the core of the north-east buttress of the east of Ancaster church in the course of reconstruction during August 1960. The wall, which is of the late twelfth century with flat plain buttresses, has had a fourteenth century window inserted into it, and has been repaired and refaced possibly at same time as the insertion of the window. There remain traces of the jamb-shafts and arch-springing of the original triple twelfth-century window. The wall developed serious settlement-cracks, and these were bonded by inserting concrete tie-beams behind the face of the wall, and at the same time grouting the loose core. Both stones are likely to have been built into the buttress in the twelfth century. I am indebted to Mr. L. H. Bond, L.R.I.B.A., for bringing them and the above facts to my notice, and to the Rev. L. W. B. Bacon, Vicar of Ancaster, for permission to publish.

The Grange of S. Anna in Montauro: The Employment of a Particular Steel-Concrete Structure in a Borderline Case of Conservation and Restoration for High Seismic Area

2010 ◽  
Vol 133-134 ◽  
pp. 861-866
Author(s):  
Michele Candela ◽  
Roberta Fonti
Keyword(s):  
Great Part ◽  
Borderline Case ◽  
Seismic Events ◽  
East Side ◽  
The Core ◽  
North East ◽  
The North ◽  
High Magnitude ◽  
Seismic Area ◽  
The Church

For at least five hundred years, the majestic grange of St. Anne in Montauro (CZ) has been overlooking the wonderful gulf of Squillace, placed at the core of Calabrian Ionic Coast. Masonry ramparts size (more than 7 metres high and 1,60 wide at the basis) together with the massive presence of four angular towers immediately hit even an inattentive beholder. Unfortunately, the predominant presence of grange results damaged by a clearly visible crack outline, which turned a great part of surrounding wall into a perpendicular heap of huge masonry portions. They appear disconnected and sheer, so that some panel systems are already collapsed on the north-east side of the building, included many internal constructions such as the church. The serious damage is not only due to repeated seismic events of high magnitude, that systematically run over this zone of Calabria. This article will describe in detail the methodologies and techniques of its making safe, considering the seismic and geological risk of the zone.

Rainsborough, Northants, England: Excavations 1961–5

1968 ◽  
Vol 33 ◽  
pp. 207-306 ◽  
Author(s):  
Michael Avery ◽  
J. E. G. Sutton ◽  
J. W. Banks ◽  
M. S. Tite ◽  
J. G. Evans ◽  
...  
Keyword(s):  
Tree Roots ◽  
The West ◽  
Outer Slope ◽  
North West ◽  
Gentle Slope ◽  
The Core ◽  
North East ◽  
The North ◽  
South West ◽  
Visible Part

Rainsborough is 1 mile South of Charlton village, in the parish of Newbottle, S. Northants, 20 miles North of Oxford, (SP 526348). The camp lies atc. 480′ OD, and the area enclosed isc. 6·25 acres.It lies on the edge of a plateau: the approaches to it are flat on the north-east, east, south and south-west, but a gentle slope to the north, north-west and west gives it a wide view across the Cherwell valley, towards Madmarston and Tadmarton (see map, fig. 1 and also pl. XXV). The defences are bivallate: the inner bank stands to 10 feet above the interior, and there is a drop of about 15 feet from the crest into the inner ditch; the second bank is very much lowered by ploughing, but still reaches a height of about 4 feet on the south side, where a hedge line has protected it; the outer ditch is nowhere visible on the surface, except on the west, when it carries a higher growth of weeds. The defences are covered with turf: the inner bank has also trees, bushes and the stumps of large beeches felledc. 1950. The bank is riddled with tree roots, and the sandy character of the core has attracted rabbits: recent attempts to dig and smoke out the warrens have slightly damaged the profile of the bank. A small dry stone wall is visible part way up the outer slope of the inner bank in several places.

Assessment of E-Readiness Challenges of Farmers and Extension Workers in North-East Nigeria

2021 ◽  
pp. 59-72
Author(s):  
Rajasekhara Mouly Potluri ◽  
Narasimha Rao Vajjhala
Keyword(s):  
Information Technology ◽  
Older Age ◽  
Young Generation ◽  
Adoption Of Technology ◽  
Awareness Campaigns ◽  
The Core ◽  
North East ◽  
The North ◽  
East Region ◽  
Information And Communication

The grounded theory study-based chapter comprehensively presents information about the significance of information and communication technology, the e-readiness situation of Nigeria in the field of agri-business. The core purpose of this chapter is to discuss the e-readiness challenges faced by the farmers and extension workers communities of the north-east region of Nigeria. While introducing and application of information technology (IT), numerous challenges like infrastructural constraints including electricity, training facilities, lower literacy rates, language and cultural restrictions, lack of awareness campaigns, expensive telecom services have been facing by farmers and extension workers of the targeted region. The significant adoption of technology in agriculture by the young generation when compared to the older age, also highlighted in the chapter. The authors highlighted the dot.com boom in Africa, particularly in Nigeria, along with stakeholder's role in creating awareness of agricultural information systems.

scholarly journals Sub-luminal Motion in M87

1988 ◽  
Vol 129 ◽  
pp. 37-38
Author(s):  
J. A. Biretta ◽  
M. J. Reid ◽  
W. Junor ◽  
R. Spencer ◽  
T. Muxlow
Keyword(s):  
Dynamic Range ◽  
Complex Structure ◽  
Opening Angle ◽  
The Core ◽  
The North ◽  
Phase Errors ◽  
Vlbi Observations ◽  
The World ◽  
The Galaxy ◽  
Amplitude And Phase Errors

The galaxy M87 (3C274, NGC4486) contains one of the nearest jet sources in the northern hemisphere, and one of our best opportunities to study a jet in detail. We have made MkII VLBI observations of the nuclear jet at 1.66 GHz using 18 stations of the “World Array.” The array included Arecibo which greatly improved the north-south resolution. The data were global fringe fitted, and self-calibrated to remove both antenna and baseline amplitude and phase errors. The resulting map (Fig. 1) has a dynamic range of 2300:1 and reveals a very complex structure. At distances ≥50 mas from the core, the jet is resolved across its width and appears limb-brightened. The brightness centroid oscillates from side to side by an amount roughly equal to the jet's width; this may be caused by brightness variations at the edges of a limb-brightened jet. Within 50 mas of the core the opening angle (at the FWHM points) is 6.5°±0.3°; this is larger than that of the 20″ jet, and suggests there is recollimation between the pc and kpc scales. The jet is aligned within 1° of the 20″ jet. There is no evidence for a counter-jet; the jet/counter-jet brightness ratio is R≥200.

scholarly journals Shaken, not Stirred: the Ancestry of the Starburst Galaxy NGC 253

2010 ◽  
Vol 6 (S277) ◽  
pp. 13-16
Author(s):  
T. J. Davidge
Keyword(s):  
Near Infrared ◽  
Recent History ◽  
Starburst Galaxy ◽  
Agb Stars ◽  
Infrared Images ◽  
North East ◽  
The North ◽  
The Galaxy ◽  
Disk Plane ◽  
History Of

AbstractNear-infrared images obtained with WIRCam are used to investigate the recent history of the starburst galaxy NGC 253. The distribution of stars in the disk is lopsided, with the projected density of young and intermediate age stars in the north east portion of the disk higher than on the opposite side of the galaxy. Bright AGB stars are also detected out to 15 kpc above the disk plane. Comparisons with models suggest that the extraplanar stars formed over a broad range of ages, suggesting that the disk of NGC 253 was disrupted by a tidal encounter.

scholarly journals Populations of filaments from the distribution of galaxies in numerical simulations

2020 ◽  
Vol 641 ◽  
pp. A173 ◽  
Author(s):  
Daniela Galárraga-Espinosa ◽  
Nabila Aghanim ◽  
Mathieu Langer ◽  
Céline Gouin ◽  
Nicola Malavasi
Keyword(s):  
Monte Carlo ◽  
Statistical Study ◽  
Empirical Models ◽  
Density Profiles ◽  
The Core ◽  
The Galaxy ◽  
Dynamical Simulations ◽  
Different Populations ◽  
Average Profile ◽  
Two Populations

We present a statistical study of the filamentary structures of the cosmic web in the large hydro-dynamical simulations Illustris-TNG, Illustris, and Magneticum at redshift z = 0. We focus on the radial distribution of the galaxy density around filaments detected using the Discrete Persistent Structure Extractor (DisPerSE). We show that the average profile of filaments presents an excess of galaxy density (> 5σ) up to radial distances of 27 Mpc from the core. The relation between galaxy density and the length of filaments is further investigated showing that short (Lf <  9 Mpc) and long (Lf ≥ 20 Mpc) filaments are two statistically different populations. Short filaments are puffier, denser, and more connected to massive objects, whereas long filaments are thinner, less dense, and more connected to less massive structures. These two populations trace different environments and may correspond to bridges of matter between over-dense structures (short filaments), and to cosmic filaments shaping the skeleton of the cosmic web (long filaments). Through Markov chain Monte Carlo (MCMC) explorations, we find that the density profiles of both short and long filaments can be described by the same empirical models (generalised Navarro, Frenk and White, β-model, a single and a double power law) with different and distinct sets of parameters.

scholarly journals Ionization and Kinematics of the Narrow Line Region in Seyfert Galaxies

1987 ◽  
Vol 121 ◽  
pp. 237-254
Author(s):  
A. S. Wilson
Keyword(s):  
Rotation Axis ◽  
Seyfert Galaxies ◽  
Relativistic Electrons ◽  
Narrow Line ◽  
North East ◽  
The North ◽  
Line Region ◽  
The Galaxy ◽  
Shock Density ◽  
Narrow Line Region

Direct imaging of Seyfert galaxies in emission lines and high resolution radio mapping often show their narrow line regions and linear (double or jet-like) radio sources to be aligned on the hundreds of parsecs scale. This relationship is unlikely to reflect ionization of the thermal gas by the expanding radio components or by their relativistic electrons. The most likely explanation, which is also favored by optical polarization measurements, is that ionizing photons escape preferentially along the rotation axis of the same inner (≲ pc scale) disk as collimates the radio jet. Such a bipolar form may be the most common morphology of the narrow line region. Differences of radio properties between Seyfert type 1's and 2's may be at least partially related to aspect effects. The north east radio lobe of NGC 1068 shows a limb-brightened, conical structure with the magnetic field running parallel to the edge of the cone. This source is modelled in terms of a radiative bow shock wave being driven into the interstellar medium of the galaxy by the radio ejecta. If the pre-shock density is as high as 400 cm−3, as suggested by CO measurements, the shock velocity is found to be ≃ 75 km s−1 and the jet velocity ≃ 4000 km s−1, the latter being close to the emission line widths. The narrow line region in this galaxy is morphologically and kinematically associated with the jet.

Ras al Khaimah: further archaeological discoveries

Antiquity ◽  
1976 ◽  
Vol 50 (200) ◽  
pp. 216-222
Author(s):  
Beatrice De Cardi
Keyword(s):  
United Arab Emirates ◽  
The State ◽  
Focused Attention ◽  
North East ◽  
The North ◽  
History Of ◽  
The City

Ras a1 Khaimah is the most northerly of the seven states comprising the United Arab Emirates and its Ruler, H. H. Sheikh Saqr bin Mohammad al-Qasimi, is keenly interested in the history of the state and its people. Survey carried out there jointly with Dr D. B. Doe in 1968 had focused attention on the site of JuIfar which lies just north of the present town of Ras a1 Khaimah (de Cardi, 1971, 230-2). Julfar was in existence in Abbasid times and its importance as an entrep6t during the sixteenth and seventeenth centuries-the Portuguese Period-is reflected by the quantity and variety of imported wares to be found among the ruins of the city. Most of the sites discovered during the survey dated from that period but a group of cairns near Ghalilah and some long gabled graves in the Shimal area to the north-east of the date-groves behind Ras a1 Khaimah (map, FIG. I) clearly represented a more distant past.

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