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J/MNRAS/461/1734  HAWK-I JHK photometry of the Orion Nebula Cloud (Drass+, 2016)

The bimodal initial mass function in the Orion nebula cloud. Drass H., Haas M., Chini R., Bayo A., Hackstein M., Hoffmeister V., Godoy N., Vogt N. <Mon. Not. R. Astron. Soc., 461, 1734-1744 (2016)> =2016MNRAS.461.1734D (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Infrared sources ; Photometry, infrared Keywords: brown dwarfs - stars: formation - dust, extinction - infrared: stars Abstract: 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 ∼19.0mag, 22x28 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 0.025M separated by a pronounced dip at the hydrogen burning limit (0.08M), with a depth of about a factor of 2-3 below the log-normal distribution. Apart from ∼920 low-mass stars (M<1.4M) the IMF contains ∼760 brown dwarf candidates and ∼160 isolated planetary mass object candidates with M>0.005M, hence about 10 times more substellar candidates than known before. The substellar IMF peak at 0.025M 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. Description: Using the HAWK-I camera at the VLT on 2008 November 8-11, we obtained a large 22x28arcmin2 and deep image mosaic of the ONC in the JHK filters centred at 1.25, 1.65 and 2.15um (i.e. Ks here for short denoted as K) under good seeing conditions (full width at half-maximum <0.7arcsec). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea1.dat 78 4340 Catalogue of the HAWK-I sources
See also: J/A+A/502/883 : Very low mass ONC stars I photometry (Rodriguez-Ledesma+ 2009) J/AJ/139/950 : JHKs photometry in ONC (Robberto+, 2010) J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010) J/ApJ/733/50 : ONC mid-IR photometric monitoring (Morales-Calderon+, 2011) J/A+A/593/A7 : NH and AV Towards YSOs in the ONC (Hasenberger+, 2016) J/AJ/150/132 : JHK photometry of 1203 variables in ONC (Rice+, 2015) Byte-by-byte Description of file: tablea1.dat
Bytes Format Units Label Explanations
1- 13 F13.10 deg RAdeg Right ascension (J2000) 15- 25 F11.8 deg DEdeg Declination (J2000) 29- 36 F8.5 mag Jmag HAWK-I J magnitude (1.25um) 38- 44 F7.5 mag e_Jmag rms uncertainty on Jmag 46- 53 F8.5 mag Hmag HAWK-I H magnitude (1.65um) 55- 61 F7.5 mag e_Hmag rms uncertainty on Hmag 63- 70 F8.5 mag Ksmag HAWK-I Ks magnitude (2.15um) 72- 78 F7.5 mag e_Ksmag rms uncertainty on Ksmag
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Nov-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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