HCG 1
Compact group of galaxies
HCG 1 is a compact group of galaxy in the Hickson Compact Group catalogue identified using a systematic search by the Palomar Observatory Sky Survey lead by Paul Hickson in 1982. This group is composed of four interacting member galaxies, two of which are peculiar.
01Properties
A study proves that HCG 1A is the brightest in this group, having an absolute magnitude of 20.6, Corrected Total Blue Magnitude (B_TC) of 14.43 and Blue minus Red (B-R) 1.29, indicating this galaxy is undergoing vigorous star birth and formation. HCG 1B, 1C and 1D have absolute magnitudes of 20.0, 19.5 and 18.5, suggesting that HCG 1D is in a high chance of being dominated by old, cool and ageing stars. Hickson Compact Group 1 has a Crossing Time (H0tc) of 0.0479 and a Radial Velocity Dispersion (km/s) of 85.1. This proves that HCG 1 is a stable and moderate evolving group and this group has an environment that is conducive to have frequent gravitational interactions, which affect galaxies morphological shape and may increase star formation in certain interaction areas.
A study shows that HCG 1 have a total of 13 foreground stars, 9 foreground unidentified objects and 10 foreground galaxies. Hickson Compact Group 1 has a total of 2 out of 4 galaxies that are spirals, the spiral fraction is exactly 50% or 0.5.
Another study shows that HCG 1A and 1B has a tidal arm, indicating that they are gravitationally interacting within themselves or with other galaxies.
02Members
Hickson Compact Group 1 have 4 members. Their details and information are stated in the table below.
| HGC | Name | Type | Mag. | Right Ascension | Declination | Distance | Major Axis Diameter | Minor Axis Diameter | B_TC | B−R | Redshift | Velocity
(km/s) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1a | PGC 1627 | Sbc? peculiar | 15.0 | 00 26 07.1 | +25 43 31 | 460 Mly | 37.60 | 26.90 | 14.43 | 1.29 | 0.034147 | 10237 |
| 1b | PGC 1625 | S0/a? peculiar | 15.5 | 00 26 06.0 | +25 43 09 | 460 Mly | 42.80 | 10.70 | 15.04 | 1.36 | 0.034227 | 10266 |
| 1c | PGC 1614 | E1 | 15.9 | 00 25 54.4 | +25 43 25 | 450 Mly | 10.70 | 10.70 | 15.57 | 1.69 | 0.033543 | 10056 |
| 1d | PGC 1618 | S0 | 17.4 | 00 25 58.8 | +25 43 31 | 455 Mly | 8.50 | 4.80 | 16.50 | 1.60 | 0.033757 | 10120 |
Sources and credits
This article is adapted from the Wikipedia article “HCG 1”, 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:
- HCG 1 legacy dr10.jpg by Legacy Surveys / D.Lang (Perimeter Institute) & Meli thev, CC BY-SA 4.0
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