نوشته اصلی توسط
raad
سلام خانم اميري
من هم براي انجام ترجمه براي ويكي نجوم اعلام آمادگي مي كنم
با سلام خدمت شما و ممنون از اعلام آمادگیتون.
لطفا متن زیر را ترجمه کنید. در واقع قسمت انتهایی مسیه 104 است.
Distance
At least two methods have been used to measure the distance to the Sombrero Galaxy.
The first method relies on comparing the measured fluxes from planetary nebulae in the Sombrero Galaxy to the known luminosities of planetary nebulae in the Milky Way. This method gave the distance to the Sombrero Galaxy as 29 ± 2 Mly (8,900 ± 610 kpc).
The other method used is the surface brightness fluctuations method. This method uses the grainy appearance of the galaxy's bulge to estimate the distance to it. Nearby galaxy bulges will appear very grainy, while more distant bulges will appear smooth. Early measurements using this technique gave distances of 30.6 ± 1.3 Mly (9,400 ± 400 kpc). Later, after some refinement of the technique, a distance of 32 ± 3 Mly (9,800 ± 920 kpc) was measured.This was even further refined in 2003 to be 29.6 ± 2.5 Mly (9,100 ± 770 kpc).
The average distance measured through these two techniques is 29.3 ± 1.6 Mly (9,000 ± 490 kpc).
Nearby galaxies and galaxy group information
The Sombrero Galaxy lies within a complex, filament-like cloud of galaxies that extends to the south
of the Virgo Cluster. However, it is unclear whether the Sombrero Galaxy is part of a formal galaxy group. Hierarchical methods for identifying groups, which determine group membership by considering whether individual galaxies belong to a larger aggregate of galaxies, typically produce results showing that the Sombrero Galaxy is part of a group that includes NGC 4487, NGC 4504, NGC 4802, UGCA 289, and possibly a few other galaxies. However, results that rely on the percolation method (i.e. the "friends-of-friends" method), which links individual galaxies together to determine group membership, indicate that either the Sombrero Galaxy is not in a group or that it may only be part of a galaxy pair with UGCA 287.
Amateur astronomy observation information
The Sombrero Galaxy is located 11.5° west of Spica and 5.5° northeast of Eta Corvi.Although the galaxy is visible with 7x35 binoculars or a 4-inch (100 mm) amateur telescope, an 8-inch (200 mm) telescope is needed to distinguish the bulge from the disk, and a 10-or-12-inch (250 or 300 mm) telescope is needed to see the dark dust lane.
منبع
لطفا متن ترجمه شده را در عرض 3-4 روز به صورت پیغام خصوصی به بنده بفرستید.
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با تشکر از خانم شبنم مختاری برای ترجمه خوبشون و با تشکر از خانم gandom برای ویرایش ترجمه.
و این هم ادامه مسیه 104 ترجمه شده توسط ایشون در ویکی نجوم :
مسیه 104
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