Descent direction

Simulated dark matter halo from a cosmological N-body simulation

A dark matter halo is a hypothetical component of a galaxy that envelops the galactic disk and extends well beyond the edge of the visible galaxy. The halo's mass dominates the total mass. Since they consist of dark matter, halos cannot be observed directly, but their existence is inferred through their effects on the motions of stars and gas in galaxies. Dark matter halos play a key role in current models of galaxy formation and evolution.

Galaxy rotation curve for the Milky Way. Vertical axis is speed of rotation about the galactic center. Horizontal axis is distance from the galactic center. The sun is marked with a yellow ball. The observed curve of speed of rotation is blue. The predicted curve based upon stellar mass and gas in the Milky Way is red. Scatter in observations roughly indicated by gray bars. The difference is due to dark matter or perhaps a modification of the law of gravity.

Rotation curves as evidence of a dark matter halo

The presence of dark matter in the halo is demonstrated by its gravitational effect on a spiral galaxy's rotation curve. Without large amounts of mass throughout the (roughly spherical) halo, the rotational velocity of the galaxy should decrease at large distances from the galactic core, just like the velocity of the outer planets decrease with distance from the Sun. However, observations of spiral galaxies, particularly radio observations of line emission from neutral atomic hydrogen (known, in astronomical parlance, as HI), show that the rotation curve of most spiral galaxies flattens out, meaning that rotational velocities do not decrease with distance from the galactic center. The absence of any visible matter to account for these observations implies the presence of unobserved (i.e. dark) matter. Asserting that this dark matter does not exist would mean that the accepted theory of gravitation (General Relativity) is incomplete, and while that could be possible, most scientists would require extensive amounts of compelling evidence before seriously considering it.

The Navarro-Frenk-White profile:

$\rho (r)=\frac{\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{s}\mathrm{t}\mathrm{a}\mathrm{n}\mathrm{t}}{(r/a)(1+r/a{)}^2}$

is often used to model the distribution of mass in dark matter halos. Theoretical dark matter halos produced in computer simulations are best described by the Einasto profile:

$\rho (r)={\rho }_0{e}^{-\alpha r^n}.$

Theories about the nature of dark matter

The nature of dark matter in the galactic halo of spiral galaxies is still undetermined, but there are two popular theories: either the halo is composed of weakly interacting elementary particles known as WIMPs, or it is home to large numbers of small, dark bodies known as MACHOs. It seems unlikely that the halo is composed of large quantities of gas and dust, because both ought to be detectable through observations. Searches for gravitational microlensing events in the halo of the Milky Way show that the number of MACHOs is likely not sufficient to account for the required mass.

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Milky Way dark matter halo

The visible disk of the Milky Way Galaxy is embedded in a much larger, roughly spherical halo of dark matter. The dark matter density drops off with distance from the galactic center. It is now believed that about 95% of the Galaxy is composed of dark matter, a type of matter that does not seem to interact with the rest of the Galaxy's matter and energy in any way except through gravity. The luminous matter makes up approximately 9 x 10¹⁰ solar masses. The dark matter halo is likely to include around 6 x 10¹¹ to 3 x 10¹² solar masses of dark matter.

See also

• Galaxy formation and evolution
• Galactic coordinate system
• Disc (galaxy)
• Bulge (astronomy)
• Galactic halo
• Spiral arm
• Dark matter
• Dark galaxy

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

Further reading

• 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
  
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• One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
  
  In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
  
  Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
  
  Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
  
  A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
  
  The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
  
  There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang

External links

• Rare Blob Unveiled: Evidence For Hydrogen Gas Falling Onto A Dark Matter Clump? European Southern Observatory (ScienceDaily) July 3, 2006
• Dark Matter Search Experiment , PICASSO Experiment
• Black Holes and Dark matter

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Singapore first retirement condominium ny World Class Development (North) Pte Ltd. With Procuring, dining and leisure services out there on the nearby Bukit Timah Shopping Centre, Magnificence World Centre / Plaza, Rail Mall and many consuming outlets along Jalan Jurong Kechil, Mr Patrick Tan Choon Hong attributed the rise in property prices largely to the observe of banks matching their valuations for brand spanking new property launches with the asking costs of developers ("Evaluation bank valuation process for new launches"; three April 2014). Surrounded by Australia Embassy, Russia Embassy, Singapore Embassy, 5 Star Motels with On line casino and Tourist Relax areas But if you happen to're nonetheless nervous, decide an agent you may trust for getting property in Singapore, to register you.

This rule, which applies to all new Singapore property gross sales, is to make sure that monies for a challenge, whether loans or sale proceeds, solely be used for the mission and never diverted to other makes use of, or worse, absconded with. By Property Soul, a profitable property investor and enthusiast who shares her experiences and information on her blog Posted courtesy of www.Propwise.sg , a Singapore property blog devoted to serving to you understand the true property market and make better decisions. Click here to Milionpeople.com get your free Property Beginner's and Buyer's Information Builders may conduct property launches in Singapore by way of an in-home marketing team, or more doubtless (to minimise staffing), by appointing exterior real estate businesses to do the advertising. The Panorama

The developer should open a Venture Account with a financial institution or financial institution for each housing undertaking he undertakes, earlier than he is issued with a Sale License (license to promote items in his growth). All funds from consumers before completion of the project, and construction loans, go into the undertaking account. New launch condo LA FIESTA, an exciting new condominium situated alongside Sengkang Square / Compassvale Road is a brief stroll to the bustling Sengkang City Centre where the bus interchange, Sengkang MRT and LRT stations are located. Excellent location,Premium condominium with Bayfront resort life-style theme and views ofwaterscape. Near EC pricing - Value for money! Apr 02, 2013 Sengkang New Rental Launch, La Fiesta- Sengkang MRTstation at your gate.

Assured rental return' is completely different from earning rental earnings from actual tenants over the years. Because the quantity given has truly been factored into the price, one may also argue that buyers are literally paying for their guaranteed rental quantity upfront. Strictly talking, the social gathering who advantages most from giving freely the carrot is probably the developer itself. It is as a result of these goodies are usually offered when the market starts to cool down so that developers are able to move properties off the shelves without lowering the worth. The Citron Residences is a novel blended residential and commercial growth located at 1 Marne Road in prime District 08. A mere stone\'s throw aw Read Extra First 3 Years Rental Guarantee at 6% per 12 months