2MASX J00482185−2507365 occulting pair

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]

2MASX J00482185-2507365
The pair as photographed by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationSculptor
Right ascension00h 48m 21.859s [1]
Declination−25° 07′ 36.53″[1]
Redshift0.064011[2]
Helio radial velocity19190 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] Gaia DR2 2345533837084149888

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
  1. 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.
  2. "NED results for object PGC 198197". National Aeronautics and Space Administration / Infrared Processing and Analysis Center. Retrieved 13 December 2016.
  3. "2MASX J00482185–2507365". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 13 December 2016.
  4. 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
  5. Astronomy; "Galaxy's Dark Secret Exposed" ; Daniel Pendick ; pp.20 Vol.37 Issue.1 January 2009 ;


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