2016A&A...588L...7K


Query : 2016A&A...588L...7K

2016A&A...588L...7K - Astronomy and Astrophysics, volume 588, L7-7 (2016/4-1)

VLT/SPHERE deep insight of NGC 3603's core: Segregation or confusion?

KHORRAMI Z., LANZ T., VAKILI F., LAGADEC E., LANGLOIS M., BRANDNER W., CHESNEAU O., MEYER M.R., CARBILLET M., ABE L., MOUILLET D., BEUZIT J.L., BOCCALETTI A., PERROT C., THALMANN C., SCHMID H.-M., PAVLOV A., COSTILLE A., DOHLEN K., LE MIGNANT D., PETIT C. and SAUVAGE J.F.

Abstract (from CDS):

We present new near-infrared photometric measurements of the core of the young massive cluster NGC 3603 obtained with extreme adaptive optics. The data were obtained with the SPHERE instrument mounted on ESO's Very Large Telescope, and cover three fields in the core of this cluster. We applied a correction for the effect of extinction to our data obtained in the J and K broadband filters and estimated the mass of detected sources inside the field of view of SPHERE/IRDIS, which is 13.5''x13.5''. We derived the mass function (MF) slope for each spectral band and field. The MF slope in the core is unusual compared to previous results based on HST and VLT observations. The average slope in the core is estimated as -1.06±0.26 for the main sequence stars with 3.5M☉ <M<120M☉. Thanks to the SPHERE extreme adaptive optics, 814 low-mass stars were detected to estimate the MF slope for the pre-main sequence stars with 0.6M☉ <M<3.5M☉, γ=-0.54±0.11 in the K-band images in two fields in the core of the cluster. For the first time, we derive the MF of the very core of the NGC 3603 young cluster for masses in the range 0.6-120M☉. Previous studies were either limited by crowding, lack of dynamic range, or a combination of both.

Abstract Copyright: © ESO, 2016

Journal keyword(s): open clusters and associations: individual: NGC 3603 - stars: luminosity function, mass function - stars: massive - instrumentation: adaptive optics

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 Cl* NGC 3603 BLW A1 WR* 11 15 07.31 -61 15 38.4   12.32 11.18     WN6h 60 0
2 HD 97950 Cl* 11 15 07.346 -61 15 38.52 9.64 9.83 9.03 9.69   ~ 186 2
3 Cl* NGC 3603 MDS B WR* 11 15 07.41 -61 15 38.6   12.34 11.33     WN6h 39 0
4 Cl* NGC 3603 MDS C WR* 11 15 07.59 -61 15 38.0   12.94 11.89     WN6h 41 0
5 NGC 3603 OpC 11 15 18.6 -61 15 26           ~ 984 1

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2021.08.01-22:08:57

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