NGC 5005

NGC 5005, also known as Caldwell 29, is an inclined spiral galaxy in the constellation Canes Venatici. The galaxy has a relatively bright nucleus and a bright disk that contains multiple dust lanes.[3] The galaxy's high surface brightness makes it an object that is visible to amateur astronomers using large amateur telescopes.

NGC 5005
NGC 5005 imaged by the Hubble Space Telescope
Observation data (J2000 epoch)
ConstellationCanes Venatici[1]
Right ascension13h 10m 56.2s[2]
Declination+37° 03′ 33″[2]
Redshift946 ± 5 km/s[2]
Distance~ 65 e6ly (~ 20 Mpc)[2]
Apparent magnitude (V)10.6[2]
Characteristics
TypeSAB(rs)bc[2]
Apparent size (V)5.8′ × 2.8′[2]
Other designations
UGC 8256,[2] PGC 45749,[2] Caldwell 29

Distance measurements for NGC 5005 vary from 13.7 megaparsecs (45 million light-years) to 34.6 megaparsecs (113 million light-years), averaging about 20 megaparsecs (65 million light-years).[2]

One supernova has been observed in NGC 5005: SN 1996ai (type Ia, mag. 14.5).[4]

Nucleus

NGC 5005 contains a low ionization nuclear emission region (LINER) nucleus.[5] LINER nuclei contain weakly ionized gas. The power source for the LINER emission has been debated extensively, with some researchers suggesting that LINERs are powered by active galactic nuclei that contain supermassive black holes and other researchers suggesting that LINERs are powered by star formation activity.

X-ray emission

X-ray observations of NGC 5005 have revealed that it contains a variable, point-like hard X-ray source in its nucleus.[6] These results imply that NGC 5005 contains a supermassive black hole. The strong, variable X-ray emission is characteristic of the emission expected from the hot, compressed gas in the environment outside a black hole in an active galactic nucleus.

Companion galaxy

NGC 5005 and the nearby spiral galaxy NGC 5033 comprise a physical galaxy pair.[7] The two galaxies weakly influence each other gravitationally, but they are not yet close enough to each other to be distorted by the tidal forces of the gravitational interaction.

Notes
  1. R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN 978-0-933346-51-2.
  2. "NASA/IPAC Extragalactic Database". Results for NGC 5005. Retrieved 2006-08-24.
  3. A. Sandage; J. Bedke (1994). Carnegie Atlas of Galaxies. Washington, D.C.: Carnegie Institution of Washington. ISBN 978-0-87279-667-6.
  4. Transient Name Server entry for SN 1996ai. Retrieved 30 March 2023.
  5. L. C. Ho; A. V. Filippenko; W. L. W. Sargent (1997). "A Search for "Dwarf" Seyfert Nuclei. III. Spectroscopic Parameters and Properties of the Host Galaxies". Astrophysical Journal Supplement. 112 (2): 315–390. arXiv:astro-ph/9704107. Bibcode:1997ApJS..112..315H. doi:10.1086/313041. S2CID 17086638.
  6. Y. Terashima; N. Iyomoto; L. C. Ho; A. F. Ptak (2002). "X-Ray Properties of LINERs and Low-Luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results". Astrophysical Journal Supplement. 139 (1): 1–36. arXiv:astro-ph/0203005. Bibcode:2002ApJS..139....1T. doi:10.1086/324373. S2CID 1749977.
  7. G. Helou; E. E. Salpeter; Y. Terzian (1982). "Neutral hydrogen in binary and multiple galaxies". Astronomical Journal. 87: 1443–1464. Bibcode:1982AJ.....87.1443H. doi:10.1086/113235.
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