منابع مشابه
2MASS wide field extinction maps: I. The Pipe nebula
Aims. We present a 8 × 6, high resolution extinction map of the Pipe nebula using 4.5 million stars from the Two Micron All Sky Survey (2MASS) point source catalog. Methods. The use of Nicer (Lombardi & Alves 2001), a robust and optimal technique to map the dust column density, allows us to detect a AV = 0.5 mag extinction at a 3-σ level with a 1 arcmin resolution. Results. (i) We find for the ...
متن کامل2MASS wide field extinction maps: II. The Ophiuchus and the Lupus cloud complexes
We present an extinction map of a ∼ 1 700 deg sq region that encloses the Ophiuchus, the Lupus, and the Pipe dark complexes using 42 million stars from the Two Micron All Sky Survey (2MASS) point source catalog. The use of a robust and optimal near-infrared method to map dust column density (Nicer, described in Lombardi & Alves 2001) allow us to detect extinction as low as AK = 0.05 mag with a ...
متن کاملA Galactic Plane Relative Extinction Map from 2MASS
We present three 14400 square degree relative extinction maps of the Galactic Plane (|b|< 20◦) obtained from 2MASS using accumulative star counts (Wolf diagrams). This method is independent of the colour of the stars and the variation of extinction with wavelength. Stars were counted in 3′ .5× 3′ .5 boxes, every 20′′. 1◦×1◦ surrounding fields were chosen for reference, hence the maps represent ...
متن کاملThe UKIRT Wide Field Camera ZY JHK Photometric System: Calibration from 2MASS
In this paper we describe the photometric calibration of data taken with the nearinfrared Wide Field Camera (WFCAM) on the United Kingdom Infrared Telescope (UKIRT). The broadband ZY JHK data are directly calibrated from 2MASS point sources which are abundant in every WFCAM pointing. We perform an analysis of spatial systematics in the photometric calibration, both interand intra-detector and s...
متن کاملThe 2mass Wide-field T Dwarf Search. Iv. Hunting out T Dwarfs with Methane Imaging
We present first results from a major program of methane filter photometry for low-mass stars and brown dwarfs. The definition of a new methane filter photometric system is described. A recipe is provided for the differential calibration of methane imaging data using existing TwoMicron All Sky Survey (2MASS) photometry. We show that these filters are effective in discriminating T dwarfs from ot...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2011
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201116915