Show simple item record

Author
dc.contributor.author
Dobos, L 
Author
dc.contributor.author
Csabai, I 
Author
dc.contributor.author
Yip, CW 
Author
dc.contributor.author
Budavari, T 
Author
dc.contributor.author
Wild, V 
Author
dc.contributor.author
Szalay, AS 
Availability Date
dc.date.accessioned
2020-08-11T09:54:02Z
Availability Date
dc.date.available
2020-08-11T09:54:02Z
Release
dc.date.issued
2012
uri
dc.identifier.uri
http://hdl.handle.net/10831/48275
Abstract
dc.description.abstract
In this work we present an atlas of composite spectra of galaxies based on the data of the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Galaxies are classified by colour, nuclear activity and star formation activity to calculate average spectra of high signal-to-noise ratio (S/N) and resolution ( S/N similar or equal to 132-4760 at Delta lambda= 1 angstrom), using an algorithm that is robust against outliers. Besides composite spectra, we also compute the first five principal components of the distributions in each galaxy class to characterize the nature of variations of individual spectra around the averages. The continua of the composite spectra are fitted with BC03 stellar population synthesis models to extend the wavelength coverage beyond the coverage of the SDSS spectrographs. Common derived parameters of the composites are also calculated: integrated colours in the most popular filter systems, line-strength measurements and continuum absorption indices (including Lick indices). These derived parameters are compared with the distributions of parameters of individual galaxies, and it is shown on many examples that the composites of the atlas cover much of the parameter space spanned by SDSS galaxies. By co-adding thousands of spectra, a total integration time of several months can be reached, which results in extremely low noise composites. The variations in redshift not only allow for extending the spectral coverage bluewards to the original wavelength limit of the SDSS spectrographs, but also make higher spectral resolution achievable. The composite spectrum atlas is available online at http://www.vo.elte.hu/compositeatlas..
Language
dc.language
Angol
Title
dc.title
A high-resolution atlas of composite Sloan Digital Sky Survey galaxy spectra
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-05-25T10:50:39Z
Scope
dc.format.page
1217-1238
Doi ID
dc.identifier.doi
10.1111/j.1365-2966.2011.20109.x
Wos ID
dc.identifier.wos
000299417600023
ID Scopus
dc.identifier.scopus
84856228517
MTMT ID
dc.identifier.mtmt
1931454
Issue Number
dc.identifier.issue
2
abbreviated journal
dc.identifier.jabbrev
MON NOT R ASTRON SOC
Journal
dc.identifier.jtitle
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume Number
dc.identifier.volume
420
Release Date
dc.description.issuedate
2012
department of Author
dc.contributor.institution
Alba Regia Egyetemi Központ
department of Author
dc.contributor.institution
Fizika Doktori Iskola
department of Author
dc.contributor.institution
Fizikai Intézet
department of Author
dc.contributor.institution
Mérnöki Intézet
department of Author
dc.contributor.institution
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Fizikai Intézet


Files in this item

A high-resolution atlas of composite Sloan Digital Sky Survey galaxy spectra
 

This item appears in the following Collection(s)

Show simple item record