Results 61 to 70 of about 476,629 (275)
Optical and Radio Surface Photometry of NGC 891 [PDF]
Symposium - International Astronomical Union, 1990 A general correlation between the radio and optical continuum surface brightness has been found in the edge-on galaxy NGC 891. This suggests that the relativistic electrons are produced/accelerated in the vicinity of evolved stars or stellar remnants which have a spatial distribution similar to old disk stars.
F. X. Hu +3 more
openaire +3 more sources
Improved GALEX UV Photometry for 700,000 SDSS Galaxies [PDF]
arXiv, 2023 The Galaxy Evolution Explorer (GALEX) satellite performed the first and only large-area UV survey, which in tandem with the Sloan Digital Sky Survey (SDSS) has facilitated modeling of the spectral energy distributions (SEDs) of low-redshift galaxies and the determination of various galaxy properties, in particular the star formation rate.
arxiv
Towards Precision Photometry with Extremely Large Telescopes: the Double Subgiant Branch of NGC 1851 [PDF]
, 2015 The Extremely Large Telescopes currently under construction have a collecting area that is an order of magnitude larger than the present largest optical telescopes.
Andersen, D. R. +6 more
core +2 more sources
New $ubvri$ photometry of 234 M33 star clusters [PDF]
, 2013 This is the second paper of our series. In this paper, we present $UBVRI$ photometry for 234 star clusters in the field of M33. For most of these star clusters, there is photometry in only two bands in previous studies. The photometry of these star clusters is performed using archival images from the Local Group Galaxies Survey, which covers 0.8 deg$^2$
arxiv +1 more source
Galaxy surface photometry [PDF]
Baltic Astron. 8 (1999) 535, 2000 We describe galaxy surface photometry based on fitting ellipses to the isophotes of the galaxies. Example galaxies with different isophotal shapes are used to illustrate the process, including how the deviations from elliptical isophotes are quantified using Fourier expansions.
arxiv +1 more source
Optical photometry and polarimetry and infrared photometry of 3C 345 in outburst
The Astrophysical Journal, 1993 We present V-band CCD photometry, UBVRI photopolarimetry, and near simultaneous JHK photometry of 3C 345 during a renewed outburst in spring of 1992, which reached maximum at the end of April. The observations also show a large and variable polarization.
Masami Okyudo +4 more
openaire +2 more sources
Optical polarimetry and photometry of comet 17P/Holmes [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 11pages, 7 figures, accepted for publication in ...
U. C. Joshi +2 more
openaire +4 more sources
MODERNIZATION OF AZT-22 TELESCOPE OF MAIDANAK HIGH-ALTITUDE OBSERVATORY: TESTING RESULTS
Radio Physics and Radio Astronomy, 2014 The AZT-22 telescope, equipped with the ML09000-65 CCD camera, has shown to be capable of obtaining high-quality images of astronomical objects and thus solving a wide range of observational tasks.
A. V. Sergeev +9 more
doaj +1 more source
Fiber photometry for monitoring cerebral oxygen saturation in freely-moving rodents.
Biomedical Optics Express, 2020 Hemodynamic parameters, such as tissue oxygen saturation and blood volume fraction, are important markers of brain physiology. They are also widely used surrogate markers of electrophysiological activity.
Linhui Yu +5 more
semanticscholar +1 more source
Optical photometry and spectroscopy of the 1987A-like supernova 2009mw [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 We present optical photometric and spectroscopic observations of the 1987A-like supernova (SN) 2009mw. Our $BVRI$ and $g'r'i'z'$ photometry covers 167 days of evolution, including the rise to the light curve maximum, and ends just after the beginning of the linear tail phase.
Aaron P. LaCluyze +14 more
openaire +9 more sources