NGC 4485
| Galaxie NGC 4485 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Jagdhunde |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 12h 30m 31,13s [1] |
| Deklination | +41° 42′ 04,2″ [1] |
| Erscheinungsbild | |
| Morphologischer Typ | IB(s)m / pec / HII[1] |
| Helligkeit (visuell) | 11,7 mag[2] |
| Helligkeit (B-Band) | 12,3 mag[2] |
| Winkelausdehnung | 2,4′ × 1,8′[2] |
| Positionswinkel | 15°[2] |
| Flächenhelligkeit | 13,1 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 4258-Gruppe LGG 290[1][3] |
| Rotverschiebung | 0.001644 ± 0.000023[1] |
| Radialgeschwindigkeit | (493 ± 7) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (24 ± 2) · 106 Lj (7,38 ± 0,53) Mpc [1] |
| Durchmesser | 15.000 Lj |
| Geschichte | |
| Entdeckung | Wilhelm Herschel |
| Entdeckungsdatum | 14. Januar 1788 |
| Katalogbezeichnungen | |
| NGC 4485 • UGC 7648 • PGC 41326 • CGCG 216-007 • MCG +07-26-13 • 2MASX J12303111+4142042 • Arp 269 (zusammen mit NGC 4490) • VV 30b • GC 3041 • H I 197 • h 1306 • KPG 341A • Holm 414B,• LDCE 867 NED116 | |
NGC 4485 ist eine irreguläre Zwerggalaxie vom Hubble-Typ IBm/P mit ausgedehnten Sternentstehungsgebieten im Sternbild Jagdhunde am Nordsternhimmel. Sie ist schätzungsweise 24 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 15.000 Lichtjahren. Gemeinsam mit NGC 4490 bildet sie das wechselwirkende Galaxienpaar (Arp 269), Holm 414 oder KPG 341 und gilt als Mitglied der NGC 4258-Gruppe (LGG 290).
Bei NGC 4485 handelte es sich ursprünglich einmal um eine normale Spiralgalaxie, deren Aussehen sich aber durch die dichte Begegnung mit der Galaxie NGC 4490 drastisch verändert hat. Ein sogenannter Gezeitenarm, der rund 24.000 Lichtjahre ins All ragt verbindet die beiden Galaxien.
Halton Arp gliederte seinen Katalog ungewöhnlicher Galaxien nach rein morphologischen Kriterien in Gruppen. Dieses Galaxienpaar gehört zu der Klasse Doppelgalaxien mit verbundenen Armen.
Das Objekt wurde am 14. Januar 1788 von dem deutsch-britischen Astronomen Wilhelm Herschel entdeckt.[4]
Die Galaxien NGC 4490 (links) und NGC 4485 (rechts) aufgenommen mit dem 81-cm-Spiegelteleskop des Mount-Lemmon-Observatoriums
(c) ESA/Webb, NASA & CSA, A. Adamo (Stockholm University), G. Bortolini, and the FEAST JWST team, CC BY 4.0… und mittels des James Webb-Weltraumteleskops
Literatur
- König, Michael & Binnewies, Stefan (2019): Bildatlas der Galaxien: Die Astrophysik hinter den Astrofotografien, Stuttgart: Kosmos, S. 250
- Jeff Kanipe und Dennis Webb: The Arp Atlas of Peculiar Galaxies – A Chronicle and Observer’s Guide, Richmond 2006, ISBN 978-0-943396-76-7
Weblinks
Commons: NGC 4485 – Sammlung von Bildern, Videos und Audiodateien
- Wechselwirkende Galaxien NGC4485/90
- astronews.com: Bild des Tages 13. Mai 2014
- Starbursts in the wake of a fleeting romance (engl.)
- Spektrum.de: Amateuraufnahmen [1][2]
- ARP ATLAS OF PECULIAR GALAXIES
- Seligman Arp
- Aladin Lite
Einzelnachweise
Auf dieser Seite verwendete Medien
Ngc4485-hst-R606GB435.jpg
Autor/Urheber: Own work, Lizenz: CC BY-SA 3.0
Color rendering is done by by Aladin-software (2000A&AS..143...33B.)
Autor/Urheber: Own work, Lizenz: CC BY-SA 3.0
Color rendering is done by by Aladin-software (2000A&AS..143...33B.)
NGC4490 Galaxy from the Mount Lemmon SkyCenter Schulman Telescope courtesy Adam Block.jpg
Autor/Urheber: Adam Block/Mount Lemmon SkyCenter/University of Arizona, Lizenz: CC BY-SA 3.0 us
Deep exposure of NGC 4490 using the 0.8m Schulman Telescope at the Mount Lemmon SkyCenter
Autor/Urheber: Adam Block/Mount Lemmon SkyCenter/University of Arizona, Lizenz: CC BY-SA 3.0 us
Deep exposure of NGC 4490 using the 0.8m Schulman Telescope at the Mount Lemmon SkyCenter
- Optics 32-inch Schulman Telescope (RC Optical Systems), Acquired remotely
- Camera SBIG STX 16803 CCD Camera
- Filters AstroDon Gen II
- Dates March - April 2013
- Location Mount Lemmon SkyCenter
- Exposure LRGB = 7:2:2:2 hours
- Acquisition ACP Observatory Control Software (DC-3 Dreams),TheSky (Software Bisque), Maxim DL/CCD (Cyanogen), FlatMan XL (Alnitak)
- Processing CCDStack (CCDWare), Photoshop CS5 (Adobe), PixInsight
- Guest Astronomers Participants of the May 2013 CCD Image Processing Workshop
.jpg)
A dance of dwarf galaxies (potm2511a).jpg
(c) ESA/Webb, NASA & CSA, A. Adamo (Stockholm University), G. Bortolini, and the FEAST JWST team, CC BY 4.0
For this new ESA/Webb Picture of the Month, the NASA/ESA/CSA James Webb Space Telescope has spied a pair of dwarf galaxies engaged in a gravitational dance. These two galaxies are named NGC 4490 and NGC 4485, and they’re located about 24 million light-years away in the constellation Canes Venatici (The Hunting Dogs). Aside from the Milky Way’s own dwarf companions (the Large and Small Magellanic Clouds), this is the closest known interacting dwarf-dwarf system where astronomers have directly observed both a gas bridge and resolved stellar populations. Together NGC 4490 and NGC 4485 form the system Arp 269, which is featured in the Atlas of Peculiar Galaxies. At such a close distance (and with Webb’s impressive ability to peer through dusty cosmic clouds) these galaxies allow astronomers to witness up close the kinds of galaxy interactions that were common billions of years ago.Dwarf galaxies likely share many similarities with young galaxies in the early Universe: they are much less massive than galaxies like the Milky Way, they typically have small amounts of metals (what astronomers call elements heavier than helium), and they contain a lot of gas and relatively few stars. When nearby dwarf galaxies collide, merge, or steal gas from one another, it can tell us how galaxies billions of years ago might have grown and evolved. The nearby dwarf galaxies NGC 4490 and NGC 4485 form an intriguing pair. Nearly three decades ago, astronomers discovered a wispy bridge of gas connecting the two galaxies, showing that they have interacted in the past. Despite many studies with powerful telescopes like the NASA/ESA Hubble Space Telescope, the history between NGC4490 and NGC 4485 has remained mysterious.Recently, Webb observed this curious galactic pair as part of the Feedback in Emerging extrAgalactic Star clusTers (FEAST) programme (#1783; PI: A. Adamo). The FEAST programme used Webb’s sensitive infrared eyes to reveal the formation of new stars in different types of nearby galaxies.This image was developed using data from Webb’s Near-InfraRed Camera (NIRCam) and Mid-InfraRed Instrument (MIRI), as well as a single narrow-band filter from Hubble (657N). It reveals NGC 4490 and NGC 4485 in never-before-seen detail and illuminates the bridge of gas and stars that connects them. NGC 4490 dominates the image as the larger object occupying the left side of the image, while NGC 4485 is the smaller galaxy that hosts the top-right portion of the image. By dissecting these galaxies star by star, researchers were able to map out where young, middle-aged, and old stars reside, and trace the timeline of the galaxies’ interaction.Roughly 200 million years ago, these galaxies whirled close to one another before waltzing away. The larger galaxy, NGC 4490, ensnared a stream of gas from its companion, and this gas now trails between the galaxies like dancers connected by outstretched arms. Along the newly formed bridge of gas and within the two galaxies, this interaction spurred a burst of new stars. The concentrated areas of bright blue that appear throughout the field indicate highly ionised regions of gas by the recently formed star clusters. Just 30 million years ago, these galaxies burst alight with stars once more, with new clusters coalescing where the gas of the two galaxies mixed together.By capturing the history of the galactic dancers NGC 4490 and NGC 4485, Webb has revealed new details in how dwarf galaxies interact, giving us a glimpse of how small galaxies near and far grow and evolve.[Image Description: This Webb image shows two interacting galaxies. NGC 4490 occupies the left side of the image, while NGC 4485 appears as a white glowing hue in the top right of the field. Both galaxies are connected by a bright stream of red stretching from the top left of the image, through the bottom centre, and ending at the right under galaxy NGC 4485. There are regions of bright blue ionised gas visible in concentrated areas of the red stream. The background is black with multiple galaxies in various shapes throughout.]
(c) ESA/Webb, NASA & CSA, A. Adamo (Stockholm University), G. Bortolini, and the FEAST JWST team, CC BY 4.0
For this new ESA/Webb Picture of the Month, the NASA/ESA/CSA James Webb Space Telescope has spied a pair of dwarf galaxies engaged in a gravitational dance. These two galaxies are named NGC 4490 and NGC 4485, and they’re located about 24 million light-years away in the constellation Canes Venatici (The Hunting Dogs). Aside from the Milky Way’s own dwarf companions (the Large and Small Magellanic Clouds), this is the closest known interacting dwarf-dwarf system where astronomers have directly observed both a gas bridge and resolved stellar populations. Together NGC 4490 and NGC 4485 form the system Arp 269, which is featured in the Atlas of Peculiar Galaxies. At such a close distance (and with Webb’s impressive ability to peer through dusty cosmic clouds) these galaxies allow astronomers to witness up close the kinds of galaxy interactions that were common billions of years ago.Dwarf galaxies likely share many similarities with young galaxies in the early Universe: they are much less massive than galaxies like the Milky Way, they typically have small amounts of metals (what astronomers call elements heavier than helium), and they contain a lot of gas and relatively few stars. When nearby dwarf galaxies collide, merge, or steal gas from one another, it can tell us how galaxies billions of years ago might have grown and evolved. The nearby dwarf galaxies NGC 4490 and NGC 4485 form an intriguing pair. Nearly three decades ago, astronomers discovered a wispy bridge of gas connecting the two galaxies, showing that they have interacted in the past. Despite many studies with powerful telescopes like the NASA/ESA Hubble Space Telescope, the history between NGC4490 and NGC 4485 has remained mysterious.Recently, Webb observed this curious galactic pair as part of the Feedback in Emerging extrAgalactic Star clusTers (FEAST) programme (#1783; PI: A. Adamo). The FEAST programme used Webb’s sensitive infrared eyes to reveal the formation of new stars in different types of nearby galaxies.This image was developed using data from Webb’s Near-InfraRed Camera (NIRCam) and Mid-InfraRed Instrument (MIRI), as well as a single narrow-band filter from Hubble (657N). It reveals NGC 4490 and NGC 4485 in never-before-seen detail and illuminates the bridge of gas and stars that connects them. NGC 4490 dominates the image as the larger object occupying the left side of the image, while NGC 4485 is the smaller galaxy that hosts the top-right portion of the image. By dissecting these galaxies star by star, researchers were able to map out where young, middle-aged, and old stars reside, and trace the timeline of the galaxies’ interaction.Roughly 200 million years ago, these galaxies whirled close to one another before waltzing away. The larger galaxy, NGC 4490, ensnared a stream of gas from its companion, and this gas now trails between the galaxies like dancers connected by outstretched arms. Along the newly formed bridge of gas and within the two galaxies, this interaction spurred a burst of new stars. The concentrated areas of bright blue that appear throughout the field indicate highly ionised regions of gas by the recently formed star clusters. Just 30 million years ago, these galaxies burst alight with stars once more, with new clusters coalescing where the gas of the two galaxies mixed together.By capturing the history of the galactic dancers NGC 4490 and NGC 4485, Webb has revealed new details in how dwarf galaxies interact, giving us a glimpse of how small galaxies near and far grow and evolve.[Image Description: This Webb image shows two interacting galaxies. NGC 4490 occupies the left side of the image, while NGC 4485 appears as a white glowing hue in the top right of the field. Both galaxies are connected by a bright stream of red stretching from the top left of the image, through the bottom centre, and ending at the right under galaxy NGC 4485. There are regions of bright blue ionised gas visible in concentrated areas of the red stream. The background is black with multiple galaxies in various shapes throughout.]