Matches in SemOpenAlex for { <https://semopenalex.org/work/W2515672986> ?p ?o ?g. }
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- W2515672986 abstract "New wide-field u΄g΄r΄i΄z΄Dark Energy Camera observations centred on the nearby giant elliptical galaxy NGC 5128 covering ∼21 deg2 are used to compile a new catalogue of ∼3200 globular clusters (GCs). We report 2404 newly identified candidates, including the vast majority within ∼140 kpc of NGC 5128. We find evidence for a transition at a galactocentric radius of Rgc ≈ 55 kpc from GCs ‘intrinsic’ to NGC 5128 to those likely to have been accreted from dwarf galaxies or that may transition to the intragroup medium of the Centaurus A galaxy group. We fit power-law surface number density profiles of the form |$Sigma _{N, R_{rm gc}}propto R_{rm gc}^Gamma$| and find that inside the transition radius, the red GCs are more centrally concentrated than the blue, with Γinner, red ≈ −1.78 and Γinner, blue ≈ −1.40, respectively. Outside this region both profiles flatten, more dramatically for the red GCs (Γouter, red ≈ −0.33) compared to the blue (Γouter, blue ≈ −0.61), although the former is more likely to suffer contamination by background sources. The median (g΄ − z΄)0 = 1.27 mag colour of the inner red population is consistent with arising from the amalgamation of two giant galaxies each less luminous than present-day NGC 5128. Both inwards and outwards of the transition radius, we find the fraction of blue GCs to dominate over the red GCs, indicating a lively history of minor mergers. Assuming the blue GCs to originate primarily in dwarf galaxies, we model the population required to explain them, while remaining consistent with NGC 5128’s present-day spheroid luminosity. We find that several dozen dwarfs of luminosities Ldw, V ≃ 106–9.3 LV, ⊙, following a Schechter luminosity function with a faint-end slope of −1.50 ≲ α ≲ −1.25 is favoured, many of which may have already been disrupted in NGC 5128’s tidal field." @default.
- W2515672986 created "2016-09-16" @default.
- W2515672986 creator A5015724714 @default.
- W2515672986 creator A5016711043 @default.
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- W2515672986 creator A5039870273 @default.
- W2515672986 creator A5053651548 @default.
- W2515672986 creator A5067301203 @default.
- W2515672986 creator A5068970211 @default.
- W2515672986 creator A5087361329 @default.
- W2515672986 date "2017-04-28" @default.
- W2515672986 modified "2023-10-16" @default.
- W2515672986 title "The Survey of Centaurus A's Baryonic Structures (SCABS) – II. The extended globular cluster system of NGC 5128 and its nearby environment" @default.
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