Results 31 to 40 of about 6,945 (227)

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

CCD photometry of the active galaxy NGC 1672 [PDF]

, 2022
We obtained CCD photometry of the active galaxy NGC 1672 using the 0.9 m and 1.5 m telescopes at CTIO. We present color maps and we analyzed the photometric components of the galaxy.
Vega, Ema Irene, Feinstein Baigorri, Carlos, Forte, Juan Carlos   +2 more
core  

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 the resolved dwarf galaxy Ho IX [PDF]

, 2004
We present BVR CCD photometry down to limiting magnitude $B=23.5$ mag for 232 starlike objects and 11 diffuse objects in a $5\farcm4 \times 5\farcm4$ field of Ho IX.
D. J. Bomans, T. B. Georgiev
core   +1 more source

Surface photometry of shell galaxies

The Astrophysical Journal, 1986
We present CCD surface photometry in four passbands of shells around three bright elliptical galaxies, NGC 2865, NGC 3923 and NGC 5018. Colors, profiles across the shells, and the precise geometry of the shells are determined. The observations all favor a merger process as the origin of the shells, and the colors are consistent with those of a recently
B. P. Fort, J.-L. Prieur, D. Carter, S. J. Meatheringham, L. Vigroux   +4 more
openaire   +1 more source

Feasibility Study for Application of Digitized Henize Mt. Wilson Michigan Southern Sky Hα$$ \boldsymbol{\alpha} $$ Survey Low‐Dispersive Spectral Plates for Searches for Anomalous and Highly Redshifted Objects

Astronomische Nachrichten, EarlyView.
ABSTRACT The goal of this study is to confirm the feasibility of the use of digitized low dispersive MtWilson Michigan Southern Sky Hα$$ \alpha $$ survey astronomical photographic plates for modern astrophysical research. The detection of highly redshifted objects, such as early galaxies and quasars, is fundamental to understanding the universe's ...
Tauseef Ahmad Zafar, René Hudec, Marta Mara Merono Vidagany, Fehmi Mejri   +3 more
wiley   +1 more source

Surface photometry of early-type galaxies in rich clusters [PDF]

, 1998
This thesis investigates the morphology of early-type galaxies in two rich clusters using 2D surface photometry. In particular, the amount of light in the 'disk' component is focussed upon, as the presence of a disk is the main morphological criterion in
Steel, James, Steel, J.
core  

Galaxy morphoto-Z with neural Networks (GaZNets). I. Optimized accuracy and outlier fraction from Imaging and Photometry [PDF]

, 2022
In the era of large sky surveys, photometric redshifts (photo-z) represent crucial information for galaxy evolution and cosmology studies. In this work, we propose a new Machine Learning (ML) tool called Galaxy morphoto-Z with neural Networks (GaZNet-1),
Amaro, Valeria, Crescenzo Tortora, Valeria Amaro, Stefano Cavuoti, Radovich, Mario, Maciej Bilicki, Ran Li, Linghua Xie, Massimo Brescia, Feng, Haicheng, Li, Ran, Napolitano, Nicola R., Nicola R. Napolitano, Mario Radovich, Xie, Linghua, Tortora, Crescenzo, Cavuoti, Stefano, Li, Rui, Bilicki, Maciej, Rui Li, Haicheng Feng, Brescia, Massimo   +21 more
core   +2 more sources

Stochastic 2-D Galaxy disk Evolution Models. Resolved Stellar Populations in the Galaxy M33

Open Astronomy, 2015
We improved the stochastic 2-D galaxy disk models (Mineikis & Vansevičius 2014a) by introducing enriched gas outflows from galaxies and synthetic color-magnitude diagrams of stellar populations.
Mineikis T., Vansevičius V.
doaj   +1 more source

The ORCA‐TWIN qCMOS Experiment I. Science Case and Commissioning at Calar Alto Observatory

Astronomische Nachrichten, EarlyView.
ABSTRACT We describe a pilot study to explore a new generation of fast and low noise CMOS image sensors for time domain astronomy, using two remote telescopes with a baseline of 1635 km. The experiment involves direct imaging with novel qCMOS image sensor technology that combines fast readout with sub‐electron readout noise.
Martin M. Roth, Paško Roje, Stella Vješnica, Stefan Cikota, Alex J. Brown, Mike Kretlow, Marco Azzaro, Santiago Reinhart, Jesús Aceituno, Harry Dawson, Carsten Denker, Torsten Enßlin, Stephan Geier, Thomas Granzer, Thomas Kupfer, Gianluca Li Causi, Samaya Nissanke, José Luis Ortiz, Fernando Pedichini, Katja Poppenhäger, Axel Schwope   +20 more
wiley   +1 more source