Astronomy:UGC 11397

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UGC 11397
A spiral galaxy, seen at an angle that gives it an oval shape. It has two spiral arms that curl out from the centre. They start narrow but broaden out as they wrap around the galaxy before merging into a faint halo. The galaxy’s disc is golden in the centre with a bright core, and pale blue outside that. A swirl of dark dust strands and speckled blue star-forming regions follow the arms through the disc.
UGC 11397 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationLyra
Right ascension 19h 03m 49.1379s[1]
Declination+33° 50′ 41.178″[1]
Redshift0.015107±0.000009[1]
Helio radial velocity4,529±3 km/s[1]
Distance257.66 ± 3.08 Mly (79.000 ± 0.945 Mpc)[1]
Apparent magnitude (V)13.7[1]
Characteristics
TypeSBa[1]
Size~121,600 ly (37.27 kpc) (estimated)[1]
Apparent size (V)1.1′ × 0.6′[1]
Other designations
IRAS 19019+3346, PGC 62725[1]

UGC 11397 is a barred spiral galaxy in the constellation of Lyra. Its velocity with respect to the cosmic microwave background is 4,361±12 km/s, which corresponds to a Hubble distance of 209.8 ± 14.7 Mly (64.31 ± 4.51 Mpc).[1] However, three non-redshift measurements give a farther distance of 257.66 ± 3.08 Mly (79.000 ± 0.945 Mpc).[2] The first known reference to this galaxy comes from volume III of the Catalogue of Galaxies and of Clusters of Galaxies compiled by Fritz Zwicky in 1966, where it was listed as CGCG 202-003.[3]

UGC 11397 is a Seyfert II Galaxy, i.e. it has a quasar-like nucleus with very high surface brightnesses whose spectra reveal strong, high-ionisation emission lines, but unlike quasars, the host galaxy is clearly detectable.[4][5]

The center of UGC 11397 harbors a supermassive black hole, with a mass of 174 million M☉.[6][7]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 "Results for object UGC 11397". NASA and Caltech. https://ned.ipac.caltech.edu/byname?objname=UGC+11397. 
  2. ↑ "Distance Results for UGC 11397". NASA. https://ned.ipac.caltech.edu/cgi-bin/nDistance?name=UGC+11397. 
  3. ↑ Zwicky, Fritz; Herzog, E. (1966). Catalogue of Galaxies and of Clusters of Galaxies. III. California Institute of Technology. pp. 106–107. Bibcode: 1966cgcg.book.....Z. https://ui.adsabs.harvard.edu/abs/1966cgcg.book.....Z/abstract. Retrieved 22 June 2025. 
  4. ↑ "UGC 11397". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=UGC+11397. 
  5. ↑ Parisi, P.; Masetti, N.; Rojas, A. F.; Jiménez-Bailón, E.; Chavushyan, V.; Palazzi, E.; Bassani, L.; Bazzano, A. et al. (2014). "Accurate classification of 75 counterparts of objects detected in the 54-month Palermo Swift/BAT hard X-ray catalogue". Astronomy and Astrophysics 561: A67. doi:10.1051/0004-6361/201322409. Bibcode: 2014A&A...561A..67P. 
  6. ↑ "Centre of activity". ESA and NASA. 22 June 2025. https://esahubble.org/images/potw2525a/. 
  7. ↑ Arzoumanian, Zaven; Baker, Paul T.; Brazier, Adam; Brook, Paul R.; Burke-Spolaor, Sarah; Becsy, Bence; Charisi, Maria; Chatterjee, Shami et al. (2021-06-01). "The NANOGrav 11 yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500 Mpc". The Astrophysical Journal 914 (2): 121. doi:10.3847/1538-4357/abfcd3. ISSN 0004-637X. Bibcode: 2021ApJ...914..121A. 

Coordinates: Sky map 19h 03m 49.1379s, +33° 50′ 41.178″



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