Astronomy:ESO 325-4
From HandWiki
| ESO 325-G 004 | |
|---|---|
 Hubble Space Telescope image of ESO 325-G004 | |
| Observation data (J2000 epoch) | |
| Constellation | Centaurus |
| Right ascension | 13h 43m 33s[1] |
| Declination | −38° 10′ 33″[1] |
| Redshift | 0.033903±0.000028[2] |
| Distance | 200.8 ± 14.4 Mpc (654.9 ± 46.97 Mly)h−10.6774[2][lower-alpha 1] |
| Group or cluster | Abell S740 |
| Apparent magnitude (B) | 13.89[1] |
| Characteristics | |
| Type | E[1] |
| Size | 545,170 ly × 425,240 ly (167.15 kpc × 130.38 kpc) (diameter; ESO-IV D27.0 B-band isophote)[2][lower-alpha 2] 308,500 ly × 246,800 ly (94.58 kpc × 75.66 kpc) (diameter; 2MASS K-band total isophote)[2][lower-alpha 2] |
| Other designations | |
| ESO 325-G004, 2MASX J13433318-3810336[1] | |
ESO 325-4 (ESO 325-G 004) is an elliptical galaxy located approximately 416 million light-years away in the constellation Centaurus.[1]
ESO 325-4 acts as a strong gravitational lens, bending the light of a
background galaxy into arcs. In 2018, a combined analysis of the lensed arcs
and the motions of the galaxy's own stars was used to test general relativity
on galactic scales, measuring the spacetime curvature generated per unit mass
as γ = 0.97 ± 0.09 — consistent with the value of exactly 1 predicted by
Einstein, and at the time the most precise extragalactic
test of general relativity.[3][4]
Notes
- ↑ The given distance in the overview of NED of 133 ± 8.718 megaparsecs (433.8 ± 28.43 million light-years) was based on an estimate using the Tully-Fischer relation. The distance estimate in this infobox was based on the galaxy's redshift.
- ↑ 2.0 2.1 The quick-look major axis physical diameters given by NED of 110.77 by 86.40 kiloparsecs (361,000 by 282,000 light-years) and 62.67 by 50.14 kiloparsecs (204,000 by 164,000 light-years) were based on a distance estimate of 133 ± 8.718 megaparsecs (433.8 ± 28.43 million light-years). The quoted diameters in this infobox was based on NED's provided scale "Virgo + GA + Shapley" of 973 pc/arcsec multiplied with the given angular diameters.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "ESO 325-G004". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ESO+325-G004.
- ↑ 2.0 2.1 2.2 2.3 "Detailed Information for Object ESO 325-G 004". NASA/IPAC Extragalactic Database. https://ned.ipac.caltech.edu/cgi-bin/objsearch?objname=ESO+325-G+004&extend=no&hconst=67.74&omegam=0.3089&omegav=0.6911&corr_z=1&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES.
- ↑ Collett, Thomas E. (2018). "A precise extragalactic test of General Relativity". Science 360 (6395): 1342–1346. doi:10.1126/science.aao2469. PMID 29930135. Bibcode: 2018Sci...360.1342C.
- ↑ "Most precise test of Einstein's general relativity outside Milky Way". European Southern Observatory. 2018. https://www.eso.org/public/news/eso1819/.
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