NGC 2007

NGC 2007
Image illustrative de l’article NGC 2007
La galaxie spirale barrée NGC 2007.
Données d’observation
(Époque J2000.0)
Constellation Peintre
Ascension droite (α) 05h 34m 59,2s[1]
Déclinaison (δ) −50° 55′ 18″ [1]
Magnitude apparente (V) 13,4[2]
14,1 dans la Bande B[2]
Brillance de surface 13,42 mag/am2[2]
Dimensions apparentes (V) 1,7′ × 0,6′[2]
Décalage vers le rouge 0,015087 ± 0,000013[1]
Angle de position 83°[2]

Localisation dans la constellation : Peintre

(Voir situation dans la constellation : Peintre)
Astrométrie
Vitesse radiale 4 523 ± 4 km/s [1]
Distance 67,57 ± 4,73 Mpc (∼220 millions d'al) [1]
Caractéristiques physiques
Type d'objet Galaxie spirale barrée
Type de galaxie SB(rs)c?[1] Sc[2],[3]
Dimensions environ 31,60 kpc (∼103 000 al)[1],[a]
Découverte
Découvreur(s) John Herschel[3]
Date [3]
Désignation(s) PGC 17478
ESO 204-19
AM 0533-505[2]
Liste des galaxies spirales barrées
modifier 

NGC 2007 est une galaxie spirale barrée située dans la constellation du Peintre. Sa vitesse par rapport au fond diffus cosmologique est de 4 581 ± 6 km/s, ce qui correspond à une distance de Hubble de 67,6 ± 4,7 Mpc (∼220 millions d'al)[1]. NGC 2007 a été découverte par l'astronome britannique John Herschel en 1834[3].

La classe de luminosité de NGC 2007 est III et elle présente une large raie HI. Elle renferme également des régions d'hydrogène ionisé[1].

À ce jour, neuf mesures non basées sur le décalage vers le rouge (redshift) donnent une distance de 54,311 ± 6,182 Mpc (∼177 millions d'al)[4], ce qui est tout juste à l'extérieur des valeurs de la distance de Hubble. Notons cependant que c'est avec la valeur moyenne des mesures indépendantes, lorsqu'elles existent, que la base de données NASA/IPAC calcule le diamètre d'une galaxie et qu'en conséquence le diamètre de NGC 2007 pourrait être d'environ 39,3 kpc (∼128 000 al) si on utilisait la distance de Hubble pour le calculer.

Selon Soares et ses collègues, NGC 2007 et NGC 2008 forment une paire de galaxies[5]. Cependant, la distance de NGC 2008 est de 152,91 ± 10,70 Mpc (∼499 millions d'al) et cette paire est donc purement optique.

Notes et références

Notes

  1. ↑ Diamètre isophote du relevé ESO-Uppsala Quick Blue"" IIa-O.

Références

  1. ↑ a b c d e f g h et i (en) « Results for object NGC 2007 », NASA/IPAC Extragalactic Database (consulté le ).
  2. ↑ a b c d e f et g « Les données de «Revised NGC and IC Catalog by Wolfgang Steinicke», NGC 2000 à 2099 », sur astrovalleyfield.com (consulté le )
  3. ↑ a b c et d (en) Courtney Seligman, « Celestial Atlas Table of Contents, NGC 2007 » (consulté le ).
  4. ↑ « Your NED Search Results, Distance Results for NGC 2007 », sur ned.ipac.caltech.edu (consulté le )
  5. ↑ D. S. L. Soares, R. E. de Souza, R. R. de Carvalho et T. C. Couto da Silva, « Southern binary galaxies. I. A sample of isolated pairs. », Astronomy and Astrophysics Supplement, vol. 110,‎ , p. 371 (DOI 10.48550/arXiv.astro-ph/9410092, Bibcode 1995A&AS..110..371S, lire en ligne [PDF])

Voir aussi

Articles connexes

Liens externes

NGC 1999  •  NGC 2000  •  NGC 2001  •  NGC 2002  •  NGC 2003  •  NGC 2004  •  NGC 2005  •  NGC 2006  •  NGC 2007  •  NGC 2008  •  NGC 2009  •  NGC 2010  •  NGC 2011  •  NGC 2012  •  NGC 2013  •  NGC 2014  •  NGC 2015

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