NGC 4151
| NGC 4151 | |
|---|---|
 | |
| Pozorovací údaje (Ekvinokcium J2000,0) | |
| Typ | spirální galaxie |
| Třída | SABa[1] |
| Objevitel | William Herschel |
| Datum objevu | 17. března 1787 |
| Rektascenze | 12h 10m 32,6s[2] |
| Deklinace | +39°24′21″[2] |
| Souhvězdí | souhvězdí Honicích psů (lat. CVn) |
| Zdánlivá magnituda (V) | 10,3[3] |
| Úhlová velikost | 6,3′×4,5′[2] |
| Vzdálenost | 18,5Mpc[4] (60 M[4] ly) |
| Plošná jasnost | 13,8[3] |
| Poziční úhel | 146°[3] |
| Rudý posuv | 995 km/s[2] |
| Fyzikální charakteristiky | |
| Absolutní magnituda (V) | -19,4[2] |
| Označení v katalozích | |
| New General Catalogue | NGC 4151 |
| 2MASS | 2MASS J12103258+3924210 |
| IRAS | IRAS S12079+3941, IRAS S12080+3940 a IRAS Z12080+3940 |
| Uppsala General Catalogue | UGC 7166 |
| Principal Galaxies Catalogue | PGC 38739 |
| Jiná označení | NGC 4151, UGC 7166, PGC 38739[2] |
| (V) – měření provedena ve viditelném světle | |
| Některá data mohou pocházet z datové položky. | |
NGC 4151 je spirální galaxie v souhvězdí Honicích psů. Objevil ji William Herschel 17. března 1787.[5] Je to Seyfertova galaxie, která má aktivní galaktické jádro.[6] Středem tohoto jádra je obří černá díra, která roste pohlcováním okolního plynu v galaxii.[6] Proměnnost aktivity jejího jádra způsobuje, že hvězdná velikost galaxie kolísá v rozsahu 10,5 až 12,2.[7]
Na širokospektrálních snímcích má tato galaxie zajímavou strukturu, díky které si mezi astronomy vysloužila přezdívku „Sauronovo oko“.[6]
Reference
- ↑ SIMBAD Astronomical Database: Results for NGC 4151 [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
- ↑ a b c d e f NASA/IPAC Extragalactic Database: Results for NGC 4151 [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
- ↑ a b c FROMMERT, Hartmut. Revised NGC Data for NGC 4151 [online]. SEDS.org [cit. 2020-04-30]. Dostupné online. (anglicky)
- ↑ a b CAPPELLARI, Michele; EMSELLEM, Eric; KRAJNOVIĆ, Davor, et al. The ATLAS3D project - I. A volume-limited sample of 260 nearby early-type galaxies: science goals and selection criteria. S. 813–836. Monthly Notices of the Royal Astronomical Society [online]. Květen 2011 [cit. 2020-04-30]. Roč. 413, čís. 2, s. 813–836. Dostupné online. arXiv 1012.1551. DOI 10.1111/j.1365-2966.2010.18174.x. Bibcode 2011MNRAS.413..813C. (anglicky)
- ↑ SELIGMAN, Courtney. Celestial Atlas: NGC 4151 (= PGC 38739), the "Eye of Sauron" Galaxy [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
- ↑ a b c NGC 4151: An Active Black Hole in the "Eye of Sauron" [online]. NASA, 2011-03-10 [cit. 2020-04-30]. Dostupné online. (anglicky)
- ↑ KODRIŠ, Michal. Průvodce hvězdnou oblohou: Honicí psi [online]. [cit. 2020-04-30]. Dostupné online.
Externí odkazy
Obrázky, zvuky či videa k tématu NGC 4151 na Wikimedia Commons - NASA/IPAC Extragalactic Database: Results for NGC 4151 [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
- SIMBAD Astronomical Database: Results for NGC 4151 [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
- KODRIŠ, Michal. Průvodce hvězdnou oblohou: Honicí psi [online]. [cit. 2020-04-30]. Dostupné online.
- FROMMERT, Hartmut. Revised NGC Data for NGC 4151 [online]. SEDS.org [cit. 2020-04-30]. Dostupné online. (anglicky)
- SELIGMAN, Courtney. Celestial Atlas: NGC 4151 (= PGC 38739), the "Eye of Sauron" Galaxy [online]. [cit. 2020-04-30]. Dostupné online. (anglicky)
Média použitá na této stránce
Autor: Judy Schmidt from USA, Licence: CC BY 2.0
The brightly glowing bar portion of NGC 4151 as seen by Hubble. It is a Seyfert galaxy, which means that it has an actively accreting black hole at its nucleus, which presents itself to us as an intensely bright source. The two brighter portions near the top and bottom of the frame are where the bar terminates, and some fainter spiral arms extend outward from them. A widefield view of the galaxy by Adam Block is available to help with context: Click!
Mitchell Revalski of Georgia State University contacted me regarding the possibility of processing some of the objects he is using in his thesis, and I have been looking through the data to see what I can do. What's important in this galaxy are the brightly illuminated and glowing hydrogen clouds near the nucleus. They are a bit difficult to make out in this image because the narrowband filters required to highlight these structures were not available in a matching field of view, but some older WF/PC2 data of only the nucleus was available, so I made use of that in another image.
An article discussing this galaxy using a radio / visible / x-ray light image is available here: www.nasa.gov/mission_pages/chandra/multimedia/11-029.html
Data from the following proposal were used to create this image: A Cepheid-Based Distance to the Benchmark AGN NGC 4151
Color saturation was greatly enhanced for the whole image.
Luminosity: WFC3/UVIS F350LP Red: WFC3/UVIS F814W Green: Pseudo Blue: WFC3/UVIS F555W
North is NOT up. It is 30° counter-clockwise from up.(c) Adam Block/Mount Lemmon SkyCenter/University of Arizona, CC BY-SA 4.0
Optics 32-inch Schulman Foundation Telescope (RCOS)
Camera SBIG STX16803 CCD Camera Filters Astrodon Gen II Dates March 2016 Location Mount Lemmon SkyCenter Exposure LRGB = 14 : 6 : 5 : 5 Hours Acquisition Astronomer Control Panel (ACP), Maxim DL/CCD (Cyanogen), FlatMan XL (Alnitak) Processing CCDStack, Photoshop, PixInsight Guest Astronomers Cardiff University (England)
Credit Line & Copyright Adam Block/Mount Lemmon SkyCenter/University of ArizonaThis composite image shows the central region of the spiral galaxy NGC 4151, dubbed the "Eye of Sauron" by astronomers for its similarity to the eye of the malevolent character in "The Lord of the Rings". In the "pupil" of the eye, X-rays (blue) from the Chandra X-ray Observatory are combined with optical data (yellow) showing positively charged hydrogen ("H II") from observations with the 1-meter Jacobus Kapteyn Telescope on La Palma. The red around the pupil shows neutral hydrogen detected by radio observations with the NSF's Very Large Array. This neutral hydrogen is part of a structure near the center of NGC 4151 that has been distorted by gravitational interactions with the rest of the galaxy, and includes material falling towards the center of the galaxy. The yellow blobs around the red ellipse are regions where star formation has recently occurred.