NGC 3125
| Galaxie NGC 3125 | |
|---|---|
 | |
| Aufnahme des Hubble-Weltraumteleskops | |
| AladinLite | |
| Sternbild | Luftpumpe |
| Position Äquinoktium: J2000.0, Epoche: J2000.0 | |
| Rektaszension | 10h 06m 33,4s[1] |
| Deklination | −29° 56′ 05″[1] |
| Erscheinungsbild | |
| Morphologischer Typ | S;BCDG / HII[1] |
| Helligkeit (visuell) | 12,5 mag[2] |
| Helligkeit (B-Band) | 13,5 mag[2] |
| Winkelausdehnung | 1,1′ × 0,7′[2] |
| Positionswinkel | 114°[2] |
| Flächenhelligkeit | 12.3 mag/arcmin²[2] |
| Physikalische Daten | |
| Zugehörigkeit | NGC 3175-Gruppe LGG 189[1][3] |
| Rotverschiebung | 0.003712 ± 0.000023[1] |
| Radialgeschwindigkeit | (1113 ± 7) km/s[1] |
| Hubbledistanz H0 = 73 km/(s • Mpc) | (40 ± 3) · 106 Lj (12,3 ± 0,9) Mpc [1] |
| Geschichte | |
| Entdeckung | John Herschel |
| Entdeckungsdatum | 30. März 1835 |
| Katalogbezeichnungen | |
| NGC 3125 • PGC 29366 • ESO 435-041 • MCG -05-24-022 • IRAS 10042-2941 • 2MASX J10063331-2956073 • SGC 100419-2941.5 • HIPASS J1006-29 • LDCE 683 NED008 | |
NGC 3125 ist eine Zwerggalaxie mit ausgedehnten Sternentstehungsgebieten vom Hubble-Typ Im? im Sternbild Antlia am Südsternhimmel. Sie ist rund 40 Millionen Lichtjahre von der Milchstraße entfernt und hat einen Durchmesser von etwa 10.000 Lichtjahren.
Gemeinsam mit NGC 3113, NGC 3137, NGC 3175 und PGC 29166 bildet sie die kleine NGC 3175-Gruppe.
Das Objekt wurde am 30. März 1835 von John Herschel mit einem 18,7-Zoll-Teleskop entdeckt.[4]
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Autor/Urheber: Judy Schmidt, Lizenz: CC BY 2.0
This irregular blob of a galaxy has some serious star formation going on. The star cluster slightly up and to the right of center is the one <a href="http://archive.stsci.edu/proposal_search.php?mission=hst&id=10400" rel="nofollow">referenced in this proposal</a> as 'The Most Extreme Wolf-Rayet Star Cluster Known in the Local Universe' by Dr. Rupali Chandar. Watch her talking about her findings regarding star clusters in general <a href="https://www.youtube.com/watch?v=70VwTsFjgcw" rel="nofollow">here</a>. They talk about the HLA at the end! I am dubious about ever making a discovery that forever changes the way we view the universe as is used for a closing statement, but yeah, the HLA is pretty sweet.
Anyway, if you dare, you can attempt to read a paper on NGC 3125-A1 <a href="https://arxiv.org/abs/1312.5982" rel="nofollow">here</a>. If not, I will roughly translate it for you in a single sentence: Hot diggity dang, there's a lot of ionized helium there.
Some things to point out: The fuzzy, white "stars" dotting the edges of the galaxy are actually globular clusters, so that gives you a better sense for the scale of the galaxy. It's not a huge galaxy but the the star formation is raging as can be inferred by the red filaments of H-alpha which virtually encompass the whole thing and the usual accompanying hot, young, blue stars. Annotation of star cluster locations is <a href="http://www.geckzilla.com/astro/NGC3125_annotated.jpg" rel="nofollow">here</a>, which I made by referencing the paper I mentioned earlier.
This picture features wideband infrared, green, blue, and ultraviolet filters along with the lovable H-alpha filter. Note I did use the F814W filter across all three channels but mostly it inhabits the red along with the H-alpha.
Red: HST_10400_01_ACS_HRC_F814W_sci + HST_10400_01_ACS_HRC_F658N_sci Green: HST_10400_01_ACS_HRC_F555W_sci Blue: HST_10400_01_ACS_HRC_F435W_sci + HST_10400_01_ACS_HRC_F330W_sci
North is NOT up. It is 26.9° counter-clockwise from up.