SIMBAD references

2016MNRAS.461.1734D - Mon. Not. R. Astron. Soc., 461, 1734-1744 (2016/September-2)

The bimodal initial mass function in the Orion nebula cloud.

DRASS H., HAAS M., CHINI R., BAYO A., HACKSTEIN M., HOFFMEISTER V., GODOY N. and VOGT N.

Abstract (from CDS):

Due to its youth, proximity and richness, the Orion nebula cloud (ONC) is an ideal testbed to obtain a comprehensive view on the initial mass function (IMF) down to the planetary mass regime. Using the HAWK-I camera at the VLT, we have obtained an unprecedented deep and wide near-infrared JHK mosaic of the ONC (90 per cent completeness at K ∼ 19.0 mag, 22 x 28 arcmin2). Applying the most recent isochrones and accounting for the contamination of background stars and galaxies, we find that ONC's IMF is bimodal with distinct peaks at about 0.25 and 0.025 M separated by a pronounced dip at the hydrogen burning limit (0.08 M), with a depth of about a factor of 2-3 below the log-normal distribution. Apart from ∼920 low-mass stars (M < 1.4 M) the IMF contains ∼760 brown dwarf candidates and ∼160 isolated planetary mass object candidates with M > 0.005 M, hence about 10 times more substellar candidates than known before. The substellar IMF peak at 0.025 M could be caused by brown dwarfs and isolated planetary mass objects which have been ejected from multiple systems during the early star formation process or from circumstellar discs.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): brown dwarfs - stars: formation - dust, extinction - infrared: stars - infrared: stars

VizieR on-line data: <Available at CDS (J/MNRAS/461/1734): tablea1.dat>

Status in Simbad:  could be processed

Simbad objects: 6

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2019.12.16-12:03:16

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