Intermediate spiral galaxy

An intermediate spiral galaxy is a galaxy that is in between the classifications of a barred spiral galaxy and an unbarred spiral galaxy. It is designated as SAB in the galaxy morphological classification system devised by Gerard de Vaucouleurs.[1] Subtypes are labeled as SAB0, SABa, SABb, or SABc, following a sequence analogous to the Hubble sequence for barred and unbarred spirals. The subtype (0, a, b, or c) is based on the relative prominence of the central bulge and how tightly wound the spiral arms are.

Hubble - de Vaucouleurs Galaxy Morphology Diagram
Diagram of the Hubble - de Vaucouleurs morphological classification system illustrating the class of intermediate spirals.
M83 - Southern Pinwheel
Messier 83 is an intermediate spiral galaxy of type SABc located in the constellation Hydra.

Examples

Example Type Image Information Notes
SAB0- SAB0- is a type of lenticular galaxy
SAB0 SAB0 is a type of lenticular galaxy
SAB0+ SAB0+ is a type of lenticular galaxy
SAB0/a SAB0/a can also be considered a type of intermediate lenticular galaxy
Messier 65 SABa Messier object 065 M65 is an "SAB(rs)a"
NGC 4725 SABab NGC 4725 NGC 4725 is an "SAB(r)ab pec"
Messier 66 SABb Phot-33c-03-fullres M66 is an "SAB(s)b"
Messier 106 SABbc NGC 4258GALEX M106 is an "SAB(s)bc"
Sculptor Galaxy SABc Ngc253 2mass barred spiral Sculptor is an "SAB(s)c"
NGC 2403 SABcd NGC2403 3.6 8.0 24 microns spitzer NGC 2403 is an "SAB(s)cd"
SABd
SABdm SABdm can also be considered a type of intermediate Magellanic spiral
NGC 4625 SABm NGC 4625 I FUV g2006 SABm is a type of Magellanic spiral (Sm) NGC 4625 is an "SAB(rs)m pec"
Fireworks Galaxy SAB(rs)cd NGC6946 Galaxy from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block NGC 4625 is an "SAB(rs)cd"

References

  1. ^ de Vaucouleurs, Gerard (1963). "Revised Classification of 1500 Bright Galaxies". Astrophysical Journal Supplement. 8: 31. Bibcode:1963ApJS....8...31D. doi:10.1086/190084.
IC 1337

IC 1337 is an intermediate spiral galaxy in the constellation Capricornus. It was discovered by Stéphane Javelle on July 22, 1892.

Magellanic spiral

Magellanic spiral galaxies are (usually) dwarf galaxies which are classified as the type Sm (and SAm, SBm, SABm). They are galaxies with one single spiral arm, and are named after their prototype, the Large Magellanic Cloud, an SBm galaxy. They can be considered to be intermediate between dwarf spiral galaxies and irregular galaxies.

NGC 2082

NGC 2082 is an intermediate spiral galaxy in the Dorado constellation. It was originally thought to be part of the Dorado Group of galaxies, but was later removed. It was discovered on November 30, 1834 by John Herschel.

Supernova 1992ba, a Type II, was discovered by Robert Evans in NGC 2082.

NGC 3054

NGC 3054 is an intermediate spiral galaxy in the constellation Hydra. It was discovered by Christian Heinrich Friedrich Peters in 1859. It is probably in the same galaxy group as NGC 2935.

In January 2006, a supernova (SN 2006T) was observed in NGC 3054.

NGC 4102

NGC 4102 is an intermediate spiral galaxy located in the northern constellation of Ursa Major. The galaxy contains a LINER region and a starburst region. The starburst region is 1,000 ly (310 pc) in diameter containing some 3 billion solar masses.

NGC 4216

NGC 4216 is a metal-rich intermediate spiral galaxy located not far from the center of the Virgo Cluster of galaxies, roughly 55 million light-years away. It is seen nearly edge-on.

NGC 4444

NGC 4444 is an intermediate spiral galaxy in the constellation Centaurus. The morphological classification places it midway on the continuum between a barred spiral (SB) and an unbarred spiral (SA), with an inner region that lies between a ring-like (r) and a purely spiral form (s), and medium- (b) to loosely wound (c) outer spiral arms. This makes it a hybrid ringed, barred spiral galaxy. It has an angular size of 2.4 × 1.6 arcminutes and the estimated mass M is given log M = 9.76, yielding 5.8 billion solar masses.

NGC 4559

NGC 4559 (also known as Caldwell 36) is an intermediate spiral galaxy with a weak inner ring structure in the constellation Coma Berenices. Distance estimates for NCG 4559 range from about 29 million light-years to 51 million light-years, averaging about 29 million light-years.NGC 4559 is a member of the Coma I Group.

NGC 4654

NGC 4654 is an intermediate spiral galaxy in the constellation of Virgo at a distance of 55 million light years (16.8 megaparsecs) from the Milky Way that can be spotted with amateur telescopes.

NGC 4780

NGC 4780 is an intermediate spiral galaxy within the constellation Virgo.

NGC 514

NGC 514 is an intermediate spiral galaxy approximately 100 million light-years from the Milky Way and was discovered on 16 October 1784 by astronomer William Herschel. It has a H II nucleus.

NGC 5248

NGC 5248 (also known as Caldwell 45) is a compact intermediate spiral galaxy about 59 million light-years away in the constellation Boötes. It is a member of the NGC 5248 Group of galaxies, itself one of the Virgo III Groups strung out to the east of the Virgo Supercluster of galaxies. Distance measurements to NGC 5248 vary from 41.4 million light-years (12.7 Mpc) to 74.0 million light-years (22.7 Mpc), averaging about 58.7 million light-years (17.7 Mpc).

NGC 5529

NGC 5529 is an edge-on intermediate spiral galaxy in the constellation Boötes. It is located approximately 144 million light-years (44 megaparsecs) away.Polycyclic aromatic hydrocarbons (PAHs) have been detected in the mid-infrared spectrum of NGC 5529.

NGC 5579

NGC 5579 is an intermediate spiral galaxy in the constellation Boötes.

NGC 681

NGC 681 (also known as the Little Sombrero Galaxy) is an intermediate spiral galaxy in the constellation of Cetus, located approximately 66.5 million light-years from Earth. The name Little Sombrero Galaxy is a reference to a much larger and earlier observed sombrero-like galaxy designated M104, or the Sombrero Galaxy.

NGC 7001

NGC 7001 is an intermediate spiral galaxy located about 300 million light-years away in the constellation Aquarius. NGC 7001 has an estimated diameter of 106,000 light-years. It was discovered by English astronomer John Herschel on July 21, 1827 and was also observed by Austrian astronomer Rudolf Spitaler on September 26, 1891.

NGC 7038

NGC 7038 is an intermediate spiral galaxy located about 210 million light-years away in the constellation of Indus. NGC 7038 was discovered by astronomer John Herschel on September 30, 1834.

NGC 7047

NGC 7047 Is an intermediate spiral galaxy located about 270 million light-years away in the constellation of Aquarius. NGC 7047 is also classified as a LINER-type galaxy. NGC 7047 has an estimated diameter of 127,350 light-years. It was discovered by French astronomer Édouard Stephan on August 20, 1873. In 2009 a supernova was found in NGC 7047.

NGC 7060

NGC 7060 is an intermediate spiral galaxy located about 200 million light-years away in the constellation of Microscopium. The spiral arms of NGC 7060 appear to overlap. NGC 7060 was discovered by astronomer John Herschel on September 2, 1836.NGC 7060 is the dominant member of a small group of galaxies known as the NGC 7060 group. Other members of the group are NGC 7057, NGC 7072, and NGC 7072A.

Morphology
Structure
Active nuclei
Energetic galaxies
Low activity
Interaction
Lists
See also

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