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Author
dc.contributor.author
Varga, J 
Author
dc.contributor.author
Csabai, I 
Author
dc.contributor.author
Dobos, L 
Availability Date
dc.date.accessioned
2020-08-11T07:19:50Z
Availability Date
dc.date.available
2020-08-11T07:19:50Z
Release
dc.date.issued
2012
uri
dc.identifier.uri
http://hdl.handle.net/10831/48508
Abstract
dc.description.abstract
More than half of the sources identified by recent radio sky surveys have not been detected by wide-field optical surveys. We present a study, based on our co-added image stacking technique, in which our aim is to detect the optical emission from unresolved, isolated radio sources of the Very Large Array (VLA) Faint Images of the Radio Sky at Twenty-cm (FIRST) survey that have no identified optical counterparts in the Sloan Digital Sky Survey (SDSS) Stripe 82 co-added data set. From the FIRST catalogue, 2116 such radio point sources were selected, and cut-out images, centred on the FIRST coordinates, were generated from the Stripe 82 images. The already co-added cut-outs were stacked once again to obtain images of high signal-to-noise ratio, in the hope that optical emission from the radio sources would become detectable. Multiple stacks were generated, based on the radio luminosity of the point sources. The resulting stacked images show central peaks similar to point sources. The peaks have very red colours with steep optical spectral energy distributions. We have found that the optical spectral index α ν falls in the range -2.9 ≤ α ν ≤ -2.2 (Sν∝ναν), depending only weakly on the radio flux. The total integration times of the stacks are between 270 and 300h, and the corresponding 5σ detection limit is estimated to be about m r ≃ 26.6 mag. We argue that the detected light is mainly from the central regions of dust-reddened Type 1 active galactic nuclei. Dust-reddened quasars might represent an early phase of quasar evolution, and thus they can also give us an insight into the formation of massive galaxies. The data used in the paper are available on-line at http://www.vo.elte.hu/doublestacking. © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS.
Language
dc.language
Angol
Title
dc.title
Revealing a strongly reddened, faint active galactic nucleus population by stacking deep co-added images
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-05-27T13:17:40Z
Scope
dc.format.page
833-850
Doi ID
dc.identifier.doi
10.1111/j.1365-2966.2012.21560.x
Wos ID
dc.identifier.wos
000309456200003
ID Scopus
dc.identifier.scopus
84867058092
MTMT ID
dc.identifier.mtmt
2098930
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
426
Release Date
dc.description.issuedate
2012
department of Author
dc.contributor.institution
Konkoly Thege Miklós Csillagászati Intézet
department of Author
dc.contributor.institution
Fizika Doktori Iskola
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


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Revealing a strongly reddened, faint active galactic nucleus population by stacking deep co-added images
 

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