NGC 4731
| Galaxie NGC 4731 | |
|---|---|
 | |
| AladinLite | |
| Sternbild | Jungfrau |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 12h 51m 01,09s [1] |
| Deklination | −06° 23′ 35,0″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | SB(s)cd[1] |
| Helligkeit (visuell) | 11,5 mag[2] |
| Helligkeit (B-Band) | 12,2 mag[2] |
| Winkelausdehnung | 6,6′ × 4,2′[2] |
| Positionswinkel | 95°[2] |
| Flächenhelligkeit | 15,0 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 4697-Gruppe LGG 314[1][3] |
| Rotverschiebung | 0.004967 ± 0.000010[1] |
| Radialgeschwindigkeit | (1489 ± 3) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (62 ± 4) · 106 Lj (19,0 ± 1,3) Mpc [1] |
| Durchmesser | 80.000 Lj[4] |
| Geschichte | |
| Entdeckung | William Herschel |
| Entdeckungsdatum | 25. April 1784 |
| Katalogbezeichnungen | |
| NGC 4731 • PGC 43507/1033347 • MCG -01-33-026 • IRAS 12484-0607 • 2MASX J12510109-0623349 • GC 3254 • H I 41 • h 1452 • HIPASS J1251-06 • LDCE 904 NED261 • Holm 472A | |
NGC 4731 ist eine Balken-Spiralgalaxie vom Hubble-Typ SBc/P im Sternbild Jungfrau auf der Ekliptik. Sie ist schätzungsweise 62 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 80.000 Lichtjahren. Gemeinsam mit PGC 43526 bildet sie das wechselwirkende Galaxienpaar Holm 472.
Im selben Himmelsareal befinden sich u. a. die Galaxien NGC 4775, NGC 4786, NGC 4697, IC 3812, PGC 43697.[5]
Das Objekt wurde am 25. April 1784 von Wilhelm Herschel entdeckt.[6]
(c) ESA/Hubble, CC BY 4.0Hochaufgelöste Aufnahme des Zentralbereichs mithilfe des Hubble-Weltraumteleskops
Literatur
- König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 256
Weblinks
Einzelnachweise
Auf dieser Seite verwendete Medien
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The lights of a galactic bar (potw2422a).jpg
(c) ESA/Hubble, CC BY 4.0
This week, an image of the broad and sweeping spiral galaxy NGC 4731 is the Hubble Picture of the Week. This galaxy lies among the galaxies of the Virgo cluster, in the constellation Virgo, and is located 43 million light-years from Earth. This highly detailed image was created using six different filters. The abundance of colour illustrates the galaxy's billowing clouds of gas, dark dust bands, bright pink star-forming regions and, most obviously, the long, glowing bar with trailing arms.Barred spiral galaxies outnumber both regular spirals and elliptical galaxies put together, numbering around 60% of all galaxies. The visible bar structure is a result of orbits of stars and gas in the galaxy lining up, forming a dense region that individual stars move in and out of over time. This is the same process that maintains a galaxy's spiral arms, but it is somewhat more mysterious for bars: spiral galaxies seem to form bars in their centres as they mature, accounting for the large number of bars we see today, but can also lose them later on as the accumulated mass along the bar grows unstable. The orbital patterns and the gravitational interactions within a galaxy that sustain the bar also transport matter and energy into it, fuelling star formation. Indeed, the observing programme studying NGC 4731 seeks to investigate this flow of matter in galaxies.Beyond the bar, the spiral arms of NGC 4731 stretch out far past the confines of this close-in Hubble view. The galaxy’s elongated arms are thought to result from gravitational interactions with other, nearby galaxies in the Virgo cluster.[Image Description: A close-in view of a barred spiral galaxy. The bright, glowing bar crosses the centre of the galaxy, with spiral arms curving away from its ends and continuing out of view. It’s surrounded by bright patches of light where stars are forming, as well as dark lines of dust. The galaxy’s clouds of gas spread out from the arms and bar, giving way to a dark background with some foreground stars and small, distant galaxies.]
(c) ESA/Hubble, CC BY 4.0
This week, an image of the broad and sweeping spiral galaxy NGC 4731 is the Hubble Picture of the Week. This galaxy lies among the galaxies of the Virgo cluster, in the constellation Virgo, and is located 43 million light-years from Earth. This highly detailed image was created using six different filters. The abundance of colour illustrates the galaxy's billowing clouds of gas, dark dust bands, bright pink star-forming regions and, most obviously, the long, glowing bar with trailing arms.Barred spiral galaxies outnumber both regular spirals and elliptical galaxies put together, numbering around 60% of all galaxies. The visible bar structure is a result of orbits of stars and gas in the galaxy lining up, forming a dense region that individual stars move in and out of over time. This is the same process that maintains a galaxy's spiral arms, but it is somewhat more mysterious for bars: spiral galaxies seem to form bars in their centres as they mature, accounting for the large number of bars we see today, but can also lose them later on as the accumulated mass along the bar grows unstable. The orbital patterns and the gravitational interactions within a galaxy that sustain the bar also transport matter and energy into it, fuelling star formation. Indeed, the observing programme studying NGC 4731 seeks to investigate this flow of matter in galaxies.Beyond the bar, the spiral arms of NGC 4731 stretch out far past the confines of this close-in Hubble view. The galaxy’s elongated arms are thought to result from gravitational interactions with other, nearby galaxies in the Virgo cluster.[Image Description: A close-in view of a barred spiral galaxy. The bright, glowing bar crosses the centre of the galaxy, with spiral arms curving away from its ends and continuing out of view. It’s surrounded by bright patches of light where stars are forming, as well as dark lines of dust. The galaxy’s clouds of gas spread out from the arms and bar, giving way to a dark background with some foreground stars and small, distant galaxies.]
NGC 4731 legacy dr10.jpg
Autor/Urheber: Legacy Surveys / D.Lang (Perimeter Institute) & Meli thev, Lizenz: CC BY-SA 4.0
NGC 4731 with Legacy Surveys DR10
Autor/Urheber: Legacy Surveys / D.Lang (Perimeter Institute) & Meli thev, Lizenz: CC BY-SA 4.0
NGC 4731 with Legacy Surveys DR10
Image Credit: Legacy Surveys / D. Lang (Perimeter Institute), NERSC
Filters: g, r, z
Download websites: https://portal.nersc.gov/cfs/cosmo/data/legacysurvey/dr10/south/coadd/192/1926m062/
https://portal.nersc.gov/cfs/cosmo/data/legacysurvey/dr10/south/coadd/192/1926m065/
Found via: https://www.legacysurvey.org/viewer?ra=192.7545&dec=-6.3916&layer=ls-dr10-grz&zoom=13&bricks&ngc
I created this image with FITS-Files with SAO Image DS9 & Photoshop Elements