Results 11 to 20 of about 1,014 (183)

Galaxy surface photometry [PDF]

Open Astronomy, 1999
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.
Milvang-Jensen Bo, Jørgensen Inger
exaly   +4 more sources

Cosmology with Galaxy Photometry Alone

Astrophysical Journal Letters
We present the first cosmological constraints using only the observed photometry of galaxies. Villaescusa-Navarro et al. recently demonstrated that the internal physical properties of a single simulated galaxy contain a significant amount of cosmological
ChangHoon Hahn, Francisco Villaescusa-Navarro, Peter Melchior, Romain Teyssier   +3 more
exaly   +4 more sources

The DESI PRObabilistic Value-added Bright Galaxy Survey (PROVABGS) Mock Challenge

The Astrophysical Journal, 2023
The PRObabilistic Value-added Bright Galaxy Survey (PROVABGS) catalog will provide measurements of galaxy properties, such as stellar mass ( M _* ), star formation rate (SFR), stellar metallicity ( Z ), and stellar age ( t _age ), for >10 million ...
ChangHoon Hahn, K. J. Kwon, Rita Tojeiro, Malgorzata Siudek, Rebecca E. A. Canning, Mar Mezcua, Jeremy L. Tinker, David Brooks, Peter Doel, Kevin Fanning, Enrique Gaztañaga, Robert Kehoe, Martin Landriau, Aaron Meisner, John Moustakas, Claire Poppett, Gregory Tarle, Benjamin Weiner, Hu Zou   +18 more
doaj   +1 more source

Improved GALEX UV Photometry for 700,000 SDSS Galaxies

The Astrophysical Journal Supplement Series, 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 of low-redshift galaxies and the ...
Chandler Osborne, Samir Salim, Médéric Boquien, Mark Dickinson, Stéphane Arnouts   +4 more
doaj   +1 more source

PopSED: Population-level Inference for Galaxy Properties from Broadband Photometry with Neural Density Estimation

The Astronomical Journal, 2023
We present PopSED , a framework for the population-level inference of galaxy properties from photometric data. Unlike the traditional approach of first analyzing individual galaxies and then combining the results to determine the physical properties of ...
Jiaxuan Li, Peter Melchior, ChangHoon Hahn, Song Huang   +3 more
doaj   +1 more source

Surface Photometry of Nearby Field Galaxies: The Data [PDF]

The Astrophysical Journal Supplement Series, 2000
We have obtained integrated spectra and multi-filter photometry for a repre- sentative sample of ~200 nearby galaxies. These galaxies span the entire Hubble sequence in morphological type, as well as a wide range of luminosities (M_B = -14 to -22) and colors (B-R=0.4 to 1.8).
Jansen, RA, Franx, M, Fabricant, D, Caldwell, N   +3 more
openaire   +3 more sources

The void galaxy survey: photometry, structure and identity of void galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
We analyze photometry from deep B-band images of 59 void galaxies in the Void Galaxy Survey (VGS), together with their near-infrared 3.6$μ$m and 4.5$μ$m Spitzer photometry. The VGS galaxies constitute a sample of void galaxies that were selected by a geometric-topological procedure from the SDSS DR7 data release, and which populate the deep interior of
B. Beygu, R. F. Peletier, J. M. van der Hulst, T. H Jarrett, K. Kreckel, R. van de Weygaert, J. H. van Gorkom, M. A. Aragon-Calvo   +7 more
openaire   +4 more sources

Photometry of Remote Galaxy Clusters [PDF]

Symposium - International Astronomical Union, 1980
New data on the colors of galaxies in distant, rich clusters of galaxies are presented. Of seven clusters examined having z<0.20, all exhibit color distributions indicating that a significant proportion of the member galaxies are undergoing star formation. The one cluster studied with z<0.20 clearly shows a reduced fraction of such galaxies.
H. Butcher, A. Oemler, D. Wells
openaire   +1 more source

The Farmer: A Reproducible Profile-fitting Photometry Package for Deep Galaxy Surveys

The Astrophysical Journal Supplement Series, 2023
While space-borne optical and near-infrared facilities have succeeded in delivering a precise and spatially resolved picture of our Universe, their small survey area is known to underrepresent the true diversity of galaxy populations.
J. R. Weaver, L. Zalesky, V. Kokorev, C. J. R. McPartland, N. Chartab, K. M. L. Gould, M. Shuntov, I. Davidzon, A. Faisst, N. Stickley, P. L. Capak, S. Toft, D. Masters, B. Mobasher, D. B. Sanders, O. B. Kauffmann, H. J. McCracken, O. Ilbert, G. Brammer, A. Moneti   +19 more
doaj   +1 more source

Study photometric properties of spiral galaxy NGC 4448 using CCD camera with multiband filters

Iraqi Journal of Physics, 2018
The goal of our study is to perform detailed multiband surface photometry of the spiral galaxy NGC 4448 and its brightest star-forming regions. The structure and composition of the stellar population in the surface brightness galaxy NGC 4448 was studied
Sinan H. Ali
doaj   +1 more source