spiral galaxy Comparison Table

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spiral galaxy comparison table

Subject has purpose has apparent dimension has number of galaxie is part of is a kind of has catalog has abundance has number of Cepheid is an instance of has apparent magnitude has synonym has definition has distance has Messier number

barred spiral spiral galaxy galaxy catalog 20% of spiral galaxies are barred spiral (in Hubble's (1936) classification, SB: in Morgan's classification, B) A spiral galaxy whose nucleus is in the shape of a bar, at the ends of which the spiral arms start.

Milky Way Local Group galaxy catalog hypergalaxy A softly glowing band of light that bisects the skies of Earth, produced by light from stars and nebulae in the galactic disk. determined from Cepheid period-luminosity relation

Sa spiral spiral galaxy galaxy catalog early-type spiral In Hubble's classification, a spiral with a large nuclear bulge and closely coiled arms.

Sb spiral spiral galaxy galaxy catalog Spiral galaxy with arms spread out from the nucleus.

Sc spiral spiral galaxy galaxy catalog Spiral galaxy with arms widely spread out from the nucleus.

Seyfert galaxy spiral galaxy galaxy catalog One of a small class of galaxies (many of which are spirals) of very high luminosity and very blue continuum radiation with small, intensely bright nuclei whose spectra show strong, broad, high-excitation emission lines probably caused by discrete clouds moving at velocities that are higher than the escape velocity. Seyferts possess many of the properties of QSOs, such as the ultraviolet excess of the continuum, the wide emission lines, and the strong infrared luminosity. The energy sources in their nuclei are unexplained; presumably the energy input can be associated with some process that liberates gravitational binding energy to accelerate relativistic particles. Seyferts comprise about 1 percent of the bright galaxies. The brightest Seyfert known is NGC 1068. Weedman-Khachikian classification: class 1 Seyferts have broad Balmer line wings; class 2 have no obvious Balmer line wings.

Sombrero galaxy originally to catalog all objects which could be confused with a comet celestial sphere Messier catalog Messier object NGC 4594 A spiral galaxy in the constellation Virgo. It was the first galaxy whose rotation was detected. from Earth 104

Next galaxy: starburst galaxy Up: galaxy Previous galaxy: S0 galaxy

Subject	has purpose	has apparent dimension	has number of galaxie	is part of	is a kind of	has catalog	has abundance	has number of Cepheid	is an instance of	has apparent magnitude	has synonym	has definition	has distance	has Messier number
barred spiral					spiral galaxy	galaxy catalog	20% of spiral galaxies are barred spiral					(in Hubble's (1936) classification, SB: in Morgan's classification, B) A spiral galaxy whose nucleus is in the shape of a bar, at the ends of which the spiral arms start.
Milky Way				Local Group		galaxy catalog			hypergalaxy			A softly glowing band of light that bisects the skies of Earth, produced by light from stars and nebulae in the galactic disk.	determined from Cepheid period-luminosity relation
Sa spiral					spiral galaxy	galaxy catalog					early-type spiral	In Hubble's classification, a spiral with a large nuclear bulge and closely coiled arms.
Sb spiral					spiral galaxy	galaxy catalog						Spiral galaxy with arms spread out from the nucleus.
Sc spiral					spiral galaxy	galaxy catalog						Spiral galaxy with arms widely spread out from the nucleus.
Seyfert galaxy					spiral galaxy	galaxy catalog						One of a small class of galaxies (many of which are spirals) of very high luminosity and very blue continuum radiation with small, intensely bright nuclei whose spectra show strong, broad, high-excitation emission lines probably caused by discrete clouds moving at velocities that are higher than the escape velocity. Seyferts possess many of the properties of QSOs, such as the ultraviolet excess of the continuum, the wide emission lines, and the strong infrared luminosity. The energy sources in their nuclei are unexplained; presumably the energy input can be associated with some process that liberates gravitational binding energy to accelerate relativistic particles. Seyferts comprise about 1 percent of the bright galaxies. The brightest Seyfert known is NGC 1068. Weedman-Khachikian classification: class 1 Seyferts have broad Balmer line wings; class 2 have no obvious Balmer line wings.
Sombrero galaxy	originally to catalog all objects which could be confused with a comet			celestial sphere		Messier catalog			Messier object		NGC 4594	A spiral galaxy in the constellation Virgo. It was the first galaxy whose rotation was detected.	from Earth	104