Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266..155d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 266, NO. 1/JAN, P. 155, 1994
Astronomy and Astrophysics
Astronomy
93
Scientific paper
We present the first deep observations with the new Hitchhiker parallel CCD camera. In parallel with scheduled observations, we have observed a field near the North Galactic Pole in four wavebands, with an equivalent total exposure time of 5 h, and obtained galaxy number counts to limiting magnitudes of m_B_ = 26.4, m_V_ = 24.9, m_R_ = 26.3 and m_I_ = 22.5. The data should be complete to about 0.5 mag above these faint limits. We also present B-V, B-R, B-I, V-R and R-I colour histograms for the faint galaxies as a function of B, V or R magnitude. The observations are in good agreement with previous deep CCD data, showing a steep number-count slope in the blue, which gradually decreases for longer wavelength observations, and a gradual blueing (in terms of B - R) of the mean galaxy population at fainter magnitudes. Although the V frame is less deep, so limiting our sensitivity, there is no significant sign of equivalent blueing in V-R, suggesting that the main effect is at the shorter (observed) wavelengths, and supporting the idea that most of the excess blue galaxies are dwarfs at moderately low redshifts. We then present a simple model, based on significant numbers of dwarf galaxies, which accounts successfully for all the number-count and colour data with no evolution. The model underestimates the observed redshift distribution, and appears to be inconsistent with measures of the local luminosity function. We conclude that some level of evolution is required, unless these surveys are biased against dwarf galaxies.
Davies Jonathan I.
Disney Michael J.
Driver Simon. P.
Morgan Ian
Phillipps Steve
No associations
LandOfFree
Multicolour Faint Galaxy Number Counts with the Hitchhiker Parallel CCD Camera does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Multicolour Faint Galaxy Number Counts with the Hitchhiker Parallel CCD Camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multicolour Faint Galaxy Number Counts with the Hitchhiker Parallel CCD Camera will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1681568