منابع مشابه
Faint star counts with HST
We describe a program of star counts in the range 19 ∼< I ∼< 26 made with the WFPC cameras aboard the Hubble Space Telescope. Red (V − I > 1.0) stars at these magnitudes are primarily disk and spheroid M dwarfs. The stars are found both on dedicated images as part of the parallel program and by using appropriate archive data. We measure the faint end of the luminosity functions of the disk and ...
متن کاملFaint star counts in the near - infrared
Received ; accepted – 2 – ABSTRACT We discuss near-infrared star counts at the Galactic pole with a view to guiding the NGST and ground-based NIR cameras. Star counts from deep K-band images from the CFHT are presented, and compared with results from the 2MASS survey and some Galaxy models. With appropriate corrections for detector artifacts and galaxies, the data agree with the models down to ...
متن کاملDisk M Dwarf Luminosity Function from Hst Star Counts
We study a sample of 257 Galactic disk M dwarfs (8 MV 18:5) found in images obtained using theHubble Space Telescope (HST). These include 192 stars in 22 elds imaged with the repaired Wide Field Camera (WFC2) with mean limiting mag I = 23:7 and 65 stars in 162 elds imaged with the pre-repair Planetary Camera (PC1) with mean limiting mag V = 21:3. We nd that the disk luminosity function (LF) dro...
متن کاملStar Counts from Hst: Implications for Dark Matter
Star counts made with the Hubble Space Telescope (HST) probe four populations that are important for dark matter: disk, halo, bulge, and intergalactic. The disk mass function falls for masses M < 0.6 M⊙ in sharp contrast to the rising Salpeter function usually assumed. The amount of “observed” disk material is therefore lower than commonly believed which implies the need for disk dark matter. H...
متن کاملD outer bulge structure from near infrared star counts
We attempt to study the characteristics of the different stellar populations present in the Galactic central region. A Monte Carlo method is used to simultaneously fit 11 thin disc and triaxial outer bulge density parameters on (Ks, J-Ks) star count data in almost 100 windows from the DENIS near infrared large scale survey at-8 • <l<12 • and |b|<4 •. Various bulge density profiles and luminosit...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1984
ISSN: 0252-9211
DOI: 10.1017/s0252921100106803