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NGC 5364 = NGC 5317, Grand Design Spiral Galaxy in Virgo
NGC 5364 = NGC 5317, Grand Design Spiral Galaxy in Virgo
NGC 5364, also catalogued as NGC 5317, is a "grand-design" spiral galaxy discovered by William Herschel in 1786. Its morphological classification is SA(rs)bc pec, indicating an incomplete ring structure, loosely wound spiral arms, and a peculiar asymmetry of the galactic bulge and the spiral arms which is probably due to gravitational perturbation by its neighbors. The most likely cause is the nearby lenticular galaxy NGC 5360, although some sources suggest that the more distant NGC 5363 also shows evidence of gravitational interaction. Simbad and NED extragalactic databases list for this object an unusually wide range of photometric measurements and especially of redshift-independent distance estimates. Based on the apparent magnitude of 10.53 (V) and the median independent distance of 57.38 Mly, NGC 5364 is about 113,000 ly in diameter and nearly as bright as the Milky Way. Its redshift indicates a recession velocity of 1,265 km/s. Light blue floccules in the spiral arms are OB Associations, or immense clusters of large and very hot young stars. Hubble images of the galaxy also show numerous regions of hydrogen gas partially ionized by ultraviolet radiation emanating from recently formed stars. Above average star formation rate is most likely due to gravitational perturbation by neighboring galaxies.
NGC 5364 and the nearby lenticular galaxy NGC 5363 are major members of a small galaxy group belonging to the Virgo III Galaxy Group, which is itself the E part of the large Virgo Galaxy Cluster.
www.atlasoftheuniverse.com/galgrps/viriii.html
The background is strewn with dozens of remote small galaxies approaching the limiting magnitude of ~20.5, nearly indistinguishable from faint stars, and too numerous to label. Majority lie at light travel distances (lookback time) between 250 million and 1.5 billion light years. The image also contains two hyperluminous quasars (QSOs), J135627 and J135525 at light travel distances of 10.7 and 11.8 billion light years. Their "proper recession velocities" are superluminal. In the present cosmological epoch they lie beyond the "cosmic event horizon", and any light they are now emitting can never reach us. At the present time they seem to be respectively 1 and 1.5 magnitudes brighter than their listed apparent magnitudes. Quasars commonly manifest short and long-term variability depending on the quantity of matter accreting around their central supermassive black holes. For more information, see section 25 here:
www.cloudynights.com/articles/cat/articles/basic-extragal...
Image Details:
-Remote Takahashi TOA 150 x 1105mm, Paramount GT GEM
-OSC 32 x 300 sec, 2x drizzle, 50% linear crop
-Software:
DSS, XnView, StarNet++ v2, StarTools v 1.3 and 1.8,
Extragalactic Cosmological Calculator 2
www.cloudyni...download-links/
NGC 5364 = NGC 5317, Grand Design Spiral Galaxy in Virgo
NGC 5364 = NGC 5317, Grand Design Spiral Galaxy in Virgo
NGC 5364, also catalogued as NGC 5317, is a "grand-design" spiral galaxy discovered by William Herschel in 1786. Its morphological classification is SA(rs)bc pec, indicating an incomplete ring structure, loosely wound spiral arms, and a peculiar asymmetry of the galactic bulge and the spiral arms which is probably due to gravitational perturbation by its neighbors. The most likely cause is the nearby lenticular galaxy NGC 5360, although some sources suggest that the more distant NGC 5363 also shows evidence of gravitational interaction. Simbad and NED extragalactic databases list for this object an unusually wide range of photometric measurements and especially of redshift-independent distance estimates. Based on the apparent magnitude of 10.53 (V) and the median independent distance of 57.38 Mly, NGC 5364 is about 113,000 ly in diameter and nearly as bright as the Milky Way. Its redshift indicates a recession velocity of 1,265 km/s. Light blue floccules in the spiral arms are OB Associations, or immense clusters of large and very hot young stars. Hubble images of the galaxy also show numerous regions of hydrogen gas partially ionized by ultraviolet radiation emanating from recently formed stars. Above average star formation rate is most likely due to gravitational perturbation by neighboring galaxies.
NGC 5364 and the nearby lenticular galaxy NGC 5363 are major members of a small galaxy group belonging to the Virgo III Galaxy Group, which is itself the E part of the large Virgo Galaxy Cluster.
www.atlasoftheuniverse.com/galgrps/viriii.html
The background is strewn with dozens of remote small galaxies approaching the limiting magnitude of ~20.5, nearly indistinguishable from faint stars, and too numerous to label. Majority lie at light travel distances (lookback time) between 250 million and 1.5 billion light years. The image also contains two hyperluminous quasars (QSOs), J135627 and J135525 at light travel distances of 10.7 and 11.8 billion light years. Their "proper recession velocities" are superluminal. In the present cosmological epoch they lie beyond the "cosmic event horizon", and any light they are now emitting can never reach us. At the present time they seem to be respectively 1 and 1.5 magnitudes brighter than their listed apparent magnitudes. Quasars commonly manifest short and long-term variability depending on the quantity of matter accreting around their central supermassive black holes. For more information, see section 25 here:
www.cloudynights.com/articles/cat/articles/basic-extragal...
Image Details:
-Remote Takahashi TOA 150 x 1105mm, Paramount GT GEM
-OSC 32 x 300 sec, 2x drizzle, 50% linear crop
-Software:
DSS, XnView, StarNet++ v2, StarTools v 1.3 and 1.8,
Extragalactic Cosmological Calculator 2
www.cloudyni...download-links/