An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 12948 Search : far
galactic disk
  گرده‌ی ِ کهکشان   
gerde-ye kahkešân

Fr.: disque galactique   

The flattened component of a → spiral galaxy which is composed of stars and concentrations of dust and molecules. → Star formation takes place mainly in the disk.

galactic; → disk.

galactic dynamics
  دینامیک ِ کهکشانی   
tavânik-e kakhešâni

Fr.: dynamique galactique   

The study of the → motions of the → stars, → gas, and → dark matter in a → galaxy to explain the main → morphological and → kinematical features of the galaxy.

galactic; → dynamics.

Galactic equator
  هموگار ِ کهکشان   
hamugâr-e kahkešân

Fr.: équateur galactique   

The great circle in the sky defined by the place of the → Galactic plane or the → Milky Way. At an angle of about 62°, the Galactic equator intersects the celestial equator at two points located in the constellations → Monoceros and → Aquila.

galactic; → equator.

Galactic habitable zone
  زنار ِ زیست‌پذیر ِ کهکشان   
zonâr-e zistpazir-e kahkešân

Fr.: zone habitable galactique   

A region of the Galaxy whose boundaries are set by its calm and safe environment and access to the chemical materials necessary for building terrestrial planets similar to the Earth. → circumstellar habitable zone; → habitable zone.

galactic, → habitable; → zone.

Galactic halo
  هاله‌ی ِ کهکشان   
hâle-ye kahkešân

Fr.: halo galactique   

A roughly spherical aggregation of → globular clusters, as well as the oldest stars and unseen mass that surrounds the Galaxy.

galactic, → halo.

Galactic latitude
  ورونای ِ کهکشانی   
varunâ-ye kahkešâni

Fr.: latitude galactique   

In the → Galactic coordinate system, the angle between the line of sight to an object and the → Galactic equator. Galactic latitude, usually represented by the symbol bII, ranges from +90 degrees to -90 degrees.

galactic; → latitude.

Galactic longitude
  درژنا‌ی ِ کهکشانی   
derežnâ-ye kahkešâni

Fr.: longitude galactique   

In the → Galactic coordinate system, the angle between the → Galactic Center and the projection of the object on the → Galactic plane. Galactic longitude, usually represented by the symbol lII, ranges from 0 degrees to 360 degrees.

galactic; → longitude.

galactic nucleus
  هسته‌ی ِ کهکشان   
haste-ye kahkešân

Fr.: noyau de galaxie   

A concentration of stars and gas in the innermost region of a galaxy, sometimes extending over thousands of light-years from the center of the galaxy.

galactic; → nucleus.

galactic outflow
  استچان ِ کهکشانی   
ostacân-e kahkešâni

Fr.: flot galactique   

galactic-scale outflow.

galactic; → outflow.

galactic plane
  هامن ِ کهکشان   
hâmon-e kahkešân

Fr.: plan galactique   

The plane in which the → disk of a → spiral galaxy, such as our → Milky Way, lies.

galactic; → plane.

galactic pole
  قطب ِ کهکشان   
qotb-e kahkešân

Fr.: pôle galactique   

The point on the sky, north or south, at which the galaxy's rotation axis would meet the celestial sphere.

galactic; → pole.

Galactic radio noise
  نوفه‌ی ِ رادیویی ِ کهکشان   
nufe-ye râdioi-ye kahkešân

Fr.: bruit radio de la Galaxie   

A diffuse radio signal that originates outside the solar system. It is strongest in the direction of the Galactic plane.

galactic; → radio; → noise.

galactic rotation
  چرخش ِ کهکشان   
carxeš-e kahkešân

Fr.: rotation galactique   

The revolving of the gaseous and stellar content of a galaxy around its central nucleus. The rotation is not uniform, but differential. One revolution of the Sun within our own Galaxy takes about 220 million years, or one cosmic year.

galactic; → rotation.

galactic structure
  ساختار ِ کهکشان   
sâxtâr-e kahkešân

Fr.: structure galactique   

The global shape and the arrangement of the various parts or constituents of a galaxy.

galactic; → structure.

Galactic system
  راژمان ِ کهکشانی   
râžmân-e kahkešâni

Fr.: système galactique   

Same as → galactic coordinates.

galactic; → system.

galactic wind
  باد ِ کهکشانی   
bâd-e kahkašâni

Fr.: vent galactique   

An outflow of hot gas, analogous to the → solar wind, from a galaxy that has recently undergone a high → burst of star formation or has an → active galactic nucleus. Galactic winds are streams of high speed charged particles blowing out of galaxies with speeds of 300 to 3,000 km s-1. In the case of starbursts, galactic winds are powered by → stellar winds driven by → massive stars and → supernova explosions. Galactic winds contain a mixture of extremely hot metal-enriched supernova ejecta and cooler entrained gas and dust. Outflowing material has been observed at great distances from galaxies (10 to 100 kpc). In some cases they escape the galaxy potential well and pollute the → intergalactic medium with → heavy elements. A prominent example is the → superwind of the starburst galaxy M82.

galactic; → wind.

Galactic windows
  روزنه‌های ِ کهکشان   
rowzanehâ-ye kahkešân

Fr.: fenêtres galactiques   

The regions near the Galactic plane where there is low absorption of light by interstellar clouds so that some external galaxies may be seen through them.

galactic; → window.

Galactic year
  سال ِ کهکشانی   
sâl-e kahkešâni (#)

Fr.: année galactique   

The time taken for the Sun to revolve once around the center of the Milky Way, amounting to about 220 million years.

galactic; → year.

galactic-scale outflow
  استچان با مرپل ِ کهکشانی   
ostacân bâ marpel-e kahkešâni

Fr.: flot à l'échelle galactique   

The enormous amounts of → mass and → energy released from active galaxies into the → intergalactic medium. → Supermassive black holes, believed to exist at the centres of active galaxies (→ active galaxy), → accrete matter and liberate huge quantities of energy. The energy output is often observed as → active galactic nuclei (AGN) outflows in a wide variety of forms, e.g. → collimated  → relativistic jets and/or huge overpressured cocoons in → radio, → blueshifted broad → absorption lines in the → ultraviolet and → optical, → warm absorbers and ultrafast outflows in → X-rays, and → molecular gas in → far infrared. Moreover, the processes of → star formation and → supernova explosions release mass/energy into the surroundings. This → stellar feedback heats up, ionizes and drives gas outward, often generating large-scale outflows/→ winds. Galactic outflows are observed at low redshifts reaching a velocity as large as 1000 km s-1 and at high-z up to z ~ 5, sometimes extending over distances of 60-130 kpc. Galactic-scale outflows may be a primary driver of galaxy evolution through the removal of cool gas from star-forming regions to a galaxy's → halo or beyond.

galactic; → scale; → outflow.

galactocentric
  کهکشان-مرکزی   
kahkešân-markazi

Fr.: galactocentrique   

Of or relative to the center of a galaxy.

From galacto-, combining form of → galaxy + centric, adj. of rarr; center.

<< < -es -iv -ti 21- A r abe abs abs acc acc acc act act ada adi adu aff age alc Alf ali all alp alt ama amp ana ang ang ann ano ant ant ape apo app aps arc Arg ari art ass ast ast ast atm ato att aur aut axi B r bac Bal Bar Bar Bay bec Ber Bet Bie bij bin bio bis bla bla blu blu bol Bor bou Bra bre bro Bug C-s cal Cam can car Car Cas cat cav cel cen cer Cha cha cha che cho cir cir cir cla clo clo clu coa coe coh col col col com com com com com com com com com con con con con con con con con con con con coo cor cor cor cos cos cos Cou cou Cra Cre cri cro cub cur cyc cyl dar dat daw de- Deb dec dec dee def deg del Den dep der det deu dew dic dif dif dil dip dir dis dis dis dis dis div dog Dop dou dra dua dus dwa dyn e-m ear ecl eco eff ein Ein elb ele ele ele ele Els emi emp ene enr env epi equ equ Eri est Euc eva evo exc exc exh exo exp exp ext ext f-n Fah fam fau fee Fer fib fil fin fir fix fle flu foc for for for fra fre fre fri fun fuz gal gal gal Gan gau GCN gen geo geo geo geo Gl glo gra gra gra gra gra gre gro GW1 hab hal han HAR haz hea hel hel Hen Her heu Hig Hil hol hop hor hou Hub Hum Hyd hyd hyd hyp hys ide ign ima imp imp inc inc ind ine inf inf inf inh INP ins ins int int int int Int int int int inv ion iri irr iso iso iso Jea Jos Jun K2 Kep key kin Kol lag lam Lan lar las lav lea leg len lev lig lim lin lin lin lis lob loc log lor low lum lun lun Lym Mac mag mag mag mag mag mai Mal mar mas mas mat max mea mea mee Men mer met met met mic mid Mil min Mir mix mod mod mol mon Mor mou mul muo mys nan nat nav nec Nep neu New New NGC nob nom non non nor not nuc nuc num Nyq obj obs obs oce oen OH omn opa ope opt opt opt orb ord Ori ort osc out ove oxy pal pan par Par par par pas pea Pen per per per per per pet pha pho pho pho phy pie Pit Pla pla pla pla ple Poi pol pol pol pol pop pos pos pow pre pre pre Pre pri pri pri pro pro pro pro pro pro Pro pub pul pyr qua qua qua qua Qui rad rad rad rad rad rad ram ran rat rea rec rec rec red ref ref reg reg rel rel rem rep res res res ret rev rho Rie rim riv rol Ros rot rul S a Sah san Sat sca Sch Sch scr sec sec sec sei sel sem sep set sha she sho sid sig sil sim sin sit sky slu sno sof sol sol sol sol sou sou spa spa spe spe spe sph spi spl spr sta sta sta sta sta ste ste sti sto str str sub sub sub sug sun sup sup sup sup sur syl syn sys tal Tay tel ten ter tex the the the thi tho thu tid tim tod top tot tra tra tra tra tri tri tro tru tur twi Typ UFO ult unc uni uni uni upg ura uti val var vec vel ver ver vig vir vis voc von wak Was wav wax wea wei whi Wie win WN6 wom X-r yel you zer zod > >>