2MASX J00482185−2507365 occulting pair
| 2MASX J00482185-2507365 | |
|---|---|
 The pair as photographed by the Hubble Space Telescope | |
| Observation data (J2000 epoch) | |
| Constellation | Sculptor |
| Right ascension | 00h 48m 21.859s [1] |
| Declination | −25° 07′ 36.53″[1] |
| Redshift | 0.064011[2] |
| Heliocentric radial velocity | 19190 km/s[2] |
| Apparent magnitude (V) | 16.5[2] |
| Characteristics | |
| Apparent size (V) | 0.447' x 0.286'[3] |
| Other designations | |
| 2MASX J00482185–2507365, PGC 198197, 6dFGS gJ004821.8–250737[2] | |
The 2MASX J00482185−2507365 occulting pair is a pair of overlapping spiral galaxies found in the vicinity of NGC 253, the Sculptor Galaxy. Both galaxies are more distant than NGC 253, with the background galaxy, 2MASX J00482185−2507365 (PGC 198197), lying at redshift z=0.06, about 800 million light-years from Earth, and the foreground galaxy lying between NGC 253 and the background galaxy (0.0008 < z < 0.06).[4]
This pair of galaxies illuminates the distribution of galactic dust beyond the visible arms of a spiral galaxy. The heretofore unexpected extent of dust beyond the starry limits of the arms shows new areas for extragalactic astronomical study. The dusty arms extend 6 times the radii of the starry arms of the galaxy, and are shown silhouetted in HST images against the central and core sections of the background galaxy.[5]
See also
References
- ^ a b Skrutskie, M. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.
- ^ a b c d "NED results for object PGC 198197". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 13 December 2016.
- ^ "2MASX J00482185–2507365". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 December 2016.
- ^ arXiv:0810.2646v1 ; "An extended dust disk in a spiral galaxy; An occulting galaxy pair in ANGST" ; Bibcode:2008arXiv0810.2646H ; B. W. Holwerda, W. C. Keel, B. Williams, J. J. Dalcanton, R. S. de Jong ; 15 Oct 2008
- ^ Astronomy; "Galaxy's Dark Secret Exposed" ; Daniel Pendick ; pp.20 Vol.37 Issue.1 January 2009 ;
- Science Daily, Hubble Spies Galaxy Silhouettes, 25 September 2008 ; (accessed 3 Jan 2009)
- Astronomy.com, Galaxy silhouettes ; The Hubble Space Telescope discovers overlapping galaxies, 17 September 2008 ; (accessed 3 Jan 2009)
- SpaceRef.com, Hubble Space Telescope Image: Galaxy Silhouettes, Tuesday, 16 September 2008 (accessed 3 Jan 2009)
External links
- NASA Galaxy Silhouettes[permanent dead link]
- NASA Hubblesite
- NASA Hubble Heritage Project
- SpaceSpin.org Galaxy Silhouettes
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