IC 335
| Galaxie IC 335 | |
|---|---|
 (c) ESA/Hubble, CC BY 4.0 | |
| Aufnahme der Galaxie IC 335 mithilfe des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Chemischer Ofen |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 03h 35m 31,0s[1] |
| Deklination | −34° 26′ 49″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | S0[1] |
| Helligkeit (visuell) | 12,1 mag[2] |
| Helligkeit (B-Band) | 13,1 mag[2] |
| Winkelausdehnung | 2,6′ × 0,7′[2] |
| Positionswinkel | 84°[2] |
| Flächenhelligkeit | 12,6 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | Fornax-Cluster LGG 94[1][3] |
| Rotverschiebung | 0.005400 ± 0.000020[1] |
| Radialgeschwindigkeit | (1619 ± 6) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (67 ± 5) · 106 Lj (20,5 ± 1,4) Mpc [1] |
| Durchmesser | 45.000 Lj |
| Geschichte | |
| Entdeckung | Lewis Swift |
| Entdeckungsdatum | 15. Oktober 1887 |
| Katalogbezeichnungen | |
| IC 335/1963 • PGC 13277 • ESO 358-026 • MCG -06-08-31 • FCC 153 • LDCE 249 NED021 | |
IC 335 = IC 1963 ist eine linsenförmige Galaxie in Kantenstellung vom Hubble-Typ S0 im Sternbild Fornax am Südsternhimmel. Sie ist rund 67 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 45.000 Lichtjahren. Unter der Katalognummer FCC 153 ist das Objekt als Mitglied des Fornax-Galaxienhaufens aufgeführt.
Entdeckt wurde die Galaxie am 15. Oktober 1887 vom US-amerikanischen Astronomen Lewis Swift.[4] 10 Jahre später, am 7. September 1897, wurde sie von Swift erneut beobachtet, jedoch nicht als IC 335 wiedererkannt und somit ein weiteres Mal registriert, diesmal mit dem Namen IC 1963.
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IC 335 - Potw1451a.tif
(c) ESA/Hubble, CC BY 4.0
This new NASA/ESA Hubble Space Telescope image shows the galaxy IC 335 in front of a backdrop of distant galaxies. IC 335 is part of a galaxy group containing three other galaxies, and located in the Fornax Galaxy Cluster 60 million light-years away. As seen in this image, the disc of IC 335 appears edge-on from the vantage point of Earth. This makes it harder for astronomers to classify it, as most of the characteristics of a galaxy’s morphology — the arms of a spiral or the bar across the centre — are only visible on its face. Still, the 45 000 light-year-long galaxy could be classified as an S0 type. These lenticular galaxies are an intermediate state in galaxy morphological classification schemes between true spiral and elliptical galaxies. They have a thin stellar disc and a bulge, like spiral galaxies, but in contrast to typical spiral galaxies they have used up most of the interstellar medium. Only a few new stars can be created out of the material that is left and the star formation rate is very low. Hence, the population of stars in S0 galaxies consists mainly of aging stars, very similar to the star population in elliptical galaxies. As S0 galaxies have only ill-defined spiral arms they are easily mistaken for elliptical galaxies if they are seen inclined face-on or edge-on as IC 335 here. And indeed, despite the morphological differences between S0 and elliptical class galaxies, they share a some common characteristics, like typical sizes and spectral features. Both classes are also early-type galaxies, as they are evolving passively. However, elliptical galaxies may be passively evolving when we observe them, but they had violent interactions with other galaxies in their past. Whereas S0 galaxies are either aging and fading spiral galaxies, which never had any interactions with other galaxies, or they are the aging result of a single merger between two spiral galaxies in the past. The exact nature of these galaxies is still a matter of debate. Links Structure and Formation of S0 and Spheroidal Galaxies Can Early Type Galaxies Evolve from Fading the Disks of Late Types?
(c) ESA/Hubble, CC BY 4.0
This new NASA/ESA Hubble Space Telescope image shows the galaxy IC 335 in front of a backdrop of distant galaxies. IC 335 is part of a galaxy group containing three other galaxies, and located in the Fornax Galaxy Cluster 60 million light-years away. As seen in this image, the disc of IC 335 appears edge-on from the vantage point of Earth. This makes it harder for astronomers to classify it, as most of the characteristics of a galaxy’s morphology — the arms of a spiral or the bar across the centre — are only visible on its face. Still, the 45 000 light-year-long galaxy could be classified as an S0 type. These lenticular galaxies are an intermediate state in galaxy morphological classification schemes between true spiral and elliptical galaxies. They have a thin stellar disc and a bulge, like spiral galaxies, but in contrast to typical spiral galaxies they have used up most of the interstellar medium. Only a few new stars can be created out of the material that is left and the star formation rate is very low. Hence, the population of stars in S0 galaxies consists mainly of aging stars, very similar to the star population in elliptical galaxies. As S0 galaxies have only ill-defined spiral arms they are easily mistaken for elliptical galaxies if they are seen inclined face-on or edge-on as IC 335 here. And indeed, despite the morphological differences between S0 and elliptical class galaxies, they share a some common characteristics, like typical sizes and spectral features. Both classes are also early-type galaxies, as they are evolving passively. However, elliptical galaxies may be passively evolving when we observe them, but they had violent interactions with other galaxies in their past. Whereas S0 galaxies are either aging and fading spiral galaxies, which never had any interactions with other galaxies, or they are the aging result of a single merger between two spiral galaxies in the past. The exact nature of these galaxies is still a matter of debate. Links Structure and Formation of S0 and Spheroidal Galaxies Can Early Type Galaxies Evolve from Fading the Disks of Late Types?