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J/other/NewA/54.30 NLS1s 2MASS and WISE photometry (Chen+, 2017)
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Beginning of ReadMe :J/other/NewA/54.30 NLS1s 2MASS and WISE photometry (Chen+, 2017)
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Infrared photometric study of SDSS selected narrow line Seyfert 1 galaxies.
Chen P.S., Liu J.Y., Shan H.G.
<New Astron., 54, 30-37 (2017)>
=2017NewA...54...30C (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, optical ; Galaxies, IR ; Photometry, infrared
Keywords: galaxies: photometry - galaxies: Seyfert - infrared: galaxies
Abstract:
The infrared photometric study of SDSS selected Narrow Line Seyfert 1
Galaxies (NLS1s) is presented in this paper. We have made
cross-identifications for such NLS1s with 2MASS and WISE observations.
Finally 992 NLS1s have 2MASS and WISE counterparts. Comparisons of
NLS1s with the Broad Line Seyfert 1 (BLS1s) and Seyfert 2 galaxies are
made. It is shown that from 1um to 5um NLS1s are redder than BLS1s
and Seyfert 2 galaxies possibly due to the richer dust environment in
NLS1 nuclei or to the orientation effect while in the longer
wavelengths those three kinds of sources have quite similar behavior
indicative of radiation mainly from the similar warm starburst-related
dust and the related AGN dust.
In addition, relations between infrared colors and related (to
Hbeta) strengths of some important lines are also investigated. The
results show that the related strengths of [FeII] 4570AA are
positively correlated with infrared colors in the 1-5um region, but
negatively correlated with infrared colors in the 12-22um region; the
related strength of [OIII] 5007AA are negatively correlated with
infrared colors in the 1-5um region, but positively correlated with
infrared colors in the 12-22um region; the related strength of
[NII]6583AA are also negatively correlated with infrared colors in
the 1-5um region, but positively correlated with infrared colors in
the 12-22um region. Therefore it is indicated that the behavior of
[FeII] 4570AA is just opposed to that for [OIII] 5007AA and [NII]
6583AA This result may be caused by different origins of such lines.
Description:
In 2006 Zhou et al. (2006, Cat. J/ApJS/166/128) published the largest
sample of NLS1s selected from SDSS observations. In this sample 2011
NLS1s are presented. This sample is our main sample.