NGC 5023

Galaxie
NGC 5023
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(c) ESA/Hubble, CC BY 4.0
Hochaufgelöste Aufnahme des zentralen Bereichs der Spiralgalaxie NGC 5023[1] Hubble-Weltraumteleskop
AladinLite
SternbildJagdhunde
Position
Äquinoktium: J2000.0, Epoche: J2000.0
Rektaszension13h 12m 11,600s[2]
Deklination+44° 02′ 28,40″[2]
Erscheinungsbild
Morphologischer TypScd[2]
Helligkeit (visuell)12,1 mag[3]
Helligkeit (B-Band)12,8 mag[3]
Winkel­ausdehnung5,8′ × 0,8′[3]
Positionswinkel28°[3]
Flächen­helligkeit13,6 mag/arcmin²[3]
Physikalische Daten
ZugehörigkeitMessier 51-Gruppe
NGC 5194-Gruppe
LGG 347[2][4]
Rotverschiebung0.001358 ± 0.000003[2]
Radial­geschwin­digkeit(407 ± 1) km/s[2]
Hubbledistanz
H0 = 73 km/(s • Mpc)		(21 ± 2) · 106 Lj
(6,55 ± 0,46) Mpc [2]
Geschichte
EntdeckungWilhelm Herschel
Entdeckungsdatum9. April 1787
Katalogbezeichnungen
NGC 5023 • UGC 8286 • PGC 45849 • CGCG 217-017 • MCG +07-27-043 • IRAS 13099+4418 • GC 3452 • H II 664 • h 1559 • LDCE 867 NED133

NGC 5023 ist eine 12,1 mag helle Spiralgalaxie mit ausgeprägten Emissionslinien vom Hubble-Typ Sc im Sternbild Jagdhunde am Nordsternhimmel. Sie ist schätzungsweise 21 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 30.000 Lichtjahren. Gemeinsam mit neun weiteren Galaxien bildet sie die NGC 5194-Gruppe (LGG 347).

Das Objekt wurde am 9. April 1787 von Wilhelm Herschel mit einem 18,7-Zoll-Spiegelteleskop entdeckt,[5] der sie dabei mit „pB, mE sp-nf, nearly in the meridian, 5′ long, 0.75′ broad“[6] beschrieb.

Weblinks

Commons: NGC 5023 – Sammlung von Bildern, Videos und Audiodateien

Einzelnachweise

  1. ↑ Aladin Lite
  2. ↑ a b c d e NASA/IPAC EXTRAGALACTIC DATABASE
  3. ↑ a b c d e SEDS: NGC 5023
  4. ↑ VizieR
  5. ↑ Seligman
  6. ↑ Auke Slotegraaf: NGC 5023. Deep Sky Observer's Companion, abgerufen am 24. Februar 2015 (englisch).

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Potw1512a.tif
(c) ESA/Hubble, CC BY 4.0
A galaxy on the edge


This NASA/ESA Hubble Space Telescope image shows an edge-on view of the spiral galaxy NGC 5023. Due to its orientation we cannot appreciate its spiral arms, but we can admire the elegant profile of its disc. The galaxy lies over 30 million light-years away from us.

NGC 5023 is part of the M51 group of galaxies. The brightest galaxy in this group is Messier 51, the Whirlpool Galaxy, which has been captured by Hubble many times. NGC 5023 is less fond of the limelight and seems rather unsociable in comparison — it is relatively isolated from the other galaxies in the group.

Astronomers are particularly interested in the vertical structure of discs like these. By analysing the structure above and below the central plane of the galaxy they can make progress in understanding galaxy evolution. Astronomers are able to analyse the distribution of different types of stars within the galaxy and their properties, in particular how well evolved they are on the Hertzsprung–Russell Diagram — a scatter graph of stars that shows their evolution.

NGC 5023 is one of six edge-on spiral galaxies observed as part of a study using Hubble’s Advanced Camera for Surveys. They study this vertical distribution and find a trend which suggests that heating of the disc plays an important role in producing the stars seen away from the plane of the galaxy.

In fact, NGC 5023 is pretty popular when it comes to astronomers, despite its unsociable behaviour. The galaxy is also one of 14 disc galaxies that are part of the GHOSTS survey — a survey which uses Hubble data to study galaxy halos, outer discs and star clusters. It is the largest study to date of star populations in the outskirts of disc galaxies.

The incredible sharp sight of Hubble has allowed scientist to count more than 30 000 individual bright stars in this image. This is only a small fraction of the several billion stars that this galaxy contains, but the others are too faint to detect individually even with Hubble.

Credit:

ESA/Hubble & NASA

Advanced Search About the Image Id: potw1512a Type: Observation Release date: 23 March 2015, 10:00 Size: 4004 x 3444 px About the Object Name: NGC 5023 Type: • Local Universe : Galaxy : Type : Spiral • X - Galaxies Images/Videos Distance: 33 million light years Constellation: Canes Venatici

Coordinates Position (RA): 13 12 12.28 Position (Dec): 44° 2' 24.53" Field of view: 3.33 x 2.86 arcminutes Orientation: North is 70.3° left of vertical

Colours & filters Band Wavelength Telescope Optical V 606 nm Hubble Space Telescope ACS Infrared I 814 nm Hubble Space Telescope

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