2015ApJ...806..152S

Query : 2015ApJ...806..152S

2015ApJ...806..152S - Astrophys. J., 806, 152 (2015/June-3)

GEMINI/GeMS observations unveil the structure of the heavily obscured globular cluster Liller 1.

SARACINO S., DALESSANDRO E., FERRARO F.R., LANZONI B., GEISLER D., MAURO F., VILLANOVA S., MONI BIDIN C., MIOCCHI P. and MASSARI D.

Abstract (from CDS):


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Journal keyword(s): globular clusters: individual: Liller 1 - stars: evolution - techniques: photometric By exploiting the exceptional high-resolution capabilities of the near-IR camera GSAOI combined with the Gemini Multi-Conjugate Adaptive System at the GEMINI South Telescope, we investigated the structural and physical properties of the heavily obscured globular cluster Liller 1 in the Galactic bulge. We have obtained the deepest and most accurate color-magnitude diagram published so far for this cluster, reaching K_ ∼ 19 (below the main-sequence turnoff level). We used these data to redetermine the center of gravity of the system, finding that it is located about 2".2 southeast from the literature value. We also built new star density and surface brightness profiles for the cluster and rederived its main structural and physical parameters (scale radii, concentration parameter, central mass density, total mass). We find that Liller 1 is significantly less concentrated (concentration parameter c = 1.74) and less extended (tidal radius rt = 298" and core radius rc = 5".39) than previously thought. By using these newly determined structural parameters, we estimated the mass of Liller 1 to be Mtot = 2.3+0.3–0.3 x 106M☉ (Mtot = 1.5+0.2–0.1 x 106 M☉_ for a Kroupa initial mass function), which is comparable to that of the most massive clusters in the Galaxy (ω Centari and Terzan 5). Also, Liller 1 has the second-highest collision rate (after Terzan 5) among all star clusters in the Galaxy, thus confirming that it is an ideal environment for the formation of collisional objects (such as millisecond pulsars).

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
3 M 62 GlC 17 01 12.60 -30 06 44.5           ~ 668 0
4 NAME Rapid Burster LXB 17 33 24.0 -33 23 19           ~ 429 2
5 Liller 1 Cl* 17 33 24.50 -33 23 20.0           ~ 311 0
6 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
7 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
8 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
9 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 644 0
10 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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