NGC 7549
Galaxy in the constellation Pegasus
NGC 7549 is a peculiar barred spiral galaxy in the constellation of Pegasus. Its velocity with respect to the cosmic microwave background is 4,373±26 km/s, which corresponds to a Hubble distance of 210.4 ± 14.8 Mly (64.50 ± 4.53 Mpc). However, five non-redshift measurements give a closer mean distance of 187.41 ± 14.74 Mly (57.460 ± 4.518 Mpc). It was discovered by Irish engineer Bindon Stoney on 2 November 1850.
NGC 7549 has an active galactic nucleus, i.e. it has a compact region at the center of a galaxy that emits a significant amount of energy across the electromagnetic spectrum, with characteristics indicating that this luminosity is not produced by the stars.
01Hickson Compact Group 93
NGC 7549 is a member of the Hickson Compact Group HCG 93. This five member group of galaxies also contains NGC 7547, NGC 7550, NGC 7553, and NGC 7558.
02Arp 99
NGC 7549 along with NGC 7547 and NGC 7550 are listed together as Arp 99 in Halton Arp's Atlas of Peculiar Galaxies as Arp 99, as an example of spirals with companions attached to spiral arms.
03Supernovae
Two supernovae have been observed in NGC 7549:
- SN 2009nq (Type Ia, mag. 16.2) was discovered by the Robotic Optical Transient Search Experiment (ROTSE) on 28 December 2009.
- SN 2019fya (Type II, mag. 16.3) was discovered by Kōichi Itagaki on 24 May 2019.
Sources and credits
This article is adapted from the Wikipedia article “NGC 7549”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.
Images, from Wikimedia Commons:
- NGC 7549 SDSS2.jpg by Donald Pelletier, CC0
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