Astronomy:NGC 3746

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NGC 3746
NGC 3746 (center) with NGC 3745 (left), imaged by Kitt Peak National Observatory
Observation data (J2000 epoch)
ConstellationLeo
Right ascension 11h 37m 43.6312s[1]
Declination+22° 00′ 35.153″[1]
Redshift0.030072[1]
Helio radial velocity9,015 ± 2 km/s[1]
Distance449.2 ± 31.5 Mly (137.72 ± 9.65 Mpc)[1]
Group or clusterCopeland Septet
Apparent magnitude (V)15.01[1]
Characteristics
TypeSB(r)b[1]
Size~44,400 ly (13.62 kpc) (estimated)[1]
Apparent size (V)1.1′ × 0.5′[1]
Other designations
Copeland Septet NED02, HCG 057B, 2MASS J11374363+2200353, UGC 6597, MCG+04-28-005, PGC 35997[1]

NGC 3746 is a large barred spiral galaxy with a ring structure[2] located in the Leo constellation.[3] It is located 449 million light-years from the Solar System and has an approximate diameter of 45,000 light-years.[1] NGC 3746 was discovered by Ralph Copeland on 9 February 1874 with subsequent observations made by Hermann Kobold, Lawrence Parsons and John Louis Emil Dreyer.[4]

The luminosity class of NGC 3746 is II and it has a broad H II region with a recessed core (RET).[1]

Copeland Septet

Copeland Septet with NGC 3746 in bottom right, imaged by Mount Lemmon Observatory

NGC 3746 is a member of the Copeland Septet which comprises 7 galaxies discovered by Copeland in 1874.[5] The other 6 members are NGC 3745, NGC 3748, NGC 3750, NGC 3751, NGC 3753, and NGC 3754. Together, they are known as Hickson 57 and Arp 320.[6]

Supernovae

Two supernovae have been discovered in NGC 3746:

  • SN 2002ar (Type Ia, mag. 16.5)[7] was discovered by Dr W. D. Li from the University of California, Berkeley via unfiltered CCD images which was taken by the 0.8-m Katzman Automatic Imagining Telescope on 3 and 4 February 2002.[8] It was located 3".3 east and 0".5 south of the nucleus.[8][9]
  • SN 2005ba (Type II, mag. 17.5)[10] was discovered on 1 April 2005 by Norwegian scientists Arne Danielsen, Mikkel Steine, and Stale Kildahl via unfiltered images taken from a 'Celestron 14' reflector at Veggli, Norway.[11] It was located 14".6 west and 4".0 north of the nucleus.[12][13]

References

  1. ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 "Your NED Search Results". http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=56895&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1. 
  2. ↑ "HyperLeda -object description". http://atlas.obs-hp.fr/hyperleda/ledacat.cgi?o=NGC%203746. 
  3. ↑ Astronomy, Go. "NGC 3746 | galaxy in Leo | NGC List | GO ASTRONOMY" (in en-US). https://www.go-astronomy.com/ngc.php?ID=3974. 
  4. ↑ "New General Catalog Objects: NGC 3700 - 3749". https://cseligman.com/text/atlas/ngc37.htm#3746. 
  5. ↑ Bakich, Michael E. (2024-01-01). "Copeland's Septet" (in en-US). https://www.astronomy.com/science/copelands-septet/. 
  6. ↑ "Copeland's Septet (Hickson Compact Group 57) – Constellation Guide". https://www.constellation-guide.com/copelands-septet/. 
  7. ↑ "SN 2002ar | Transient Name Server". https://www.wis-tns.org/object/2002ar. 
  8. ↑ 8.0 8.1 Li, W. D. (2002). "Supernova 2002ar in NGC 3746". International Astronomical Union Circular (7819): 1. Bibcode: 2002IAUC.7819....1L. http://www.cbat.eps.harvard.edu/iauc/07800/07819.html#Item1. 
  9. ↑ Filippenko, A. V.; Chornock, R. (2002-02-01). "Supernovae 2002ao, 2002ap, 2002ar, 2002au, 2002av". International Astronomical Union Circular (7825): 1. ISSN 0081-0304. Bibcode: 2002IAUC.7825....1F. http://www.cbat.eps.harvard.edu/iauc/07800/07825.html#Item1. 
  10. ↑ "SN 2005ba | Transient Name Server". https://www.wis-tns.org/object/2005ba. 
  11. ↑ Kildahl, S.; Danielsen, A.; Steine, M.; Trondal, O. (2005-04-01). "Supernova 2005ba in NGC 3746". International Astronomical Union Circular (8503): 2. ISSN 0081-0304. Bibcode: 2005IAUC.8503....2K. https://ui.adsabs.harvard.edu/abs/2005IAUC.8503....2K. 
  12. ↑ "Bright Supernovae - 2005.". https://www.rochesterastronomy.org/sn2005/index.html#2005ba. 
  13. ↑ Foley, R. J.; Ganeshalingam, M.; Wong, D. S.; Swift, B. J.; Filippenko, A. V. (2005-04-01). "Supernova 2005ba in NGC 3746". International Astronomical Union Circular (8510): 2. ISSN 0081-0304. Bibcode: 2005IAUC.8510....2F. https://ui.adsabs.harvard.edu/abs/2005IAUC.8510....2F. 



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