Extreme UV QSOs

Extreme UV QSOs

We present a sample of spectroscopically confirmed QSOs with FUV-NUV color (as measured by GALEX photometry) bluer than canonical QSO templates and than the majority of known QSOs. We analyze their FUV to NIR colors, luminosities and optical spectra. The sample includes a group of 150 objects at low...

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Veröffentlicht in:arXiv.org 2009-01
Hauptverfasser: Bianchi, Luciana, Hutchings, John B, Efremova, Boryana, Herald, James E, Bressan, Alessandro, Martin, Cristopher
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Color
Emission spectra
Ionization
Luminosity
Photometry
Physics - Astrophysics of Galaxies
Physics - Cosmology and Nongalactic Astrophysics
Red shift
Websites
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creator Bianchi, Luciana
Hutchings, John B
Efremova, Boryana
Herald, James E
Bressan, Alessandro
Martin, Cristopher
description We present a sample of spectroscopically confirmed QSOs with FUV-NUV color (as measured by GALEX photometry) bluer than canonical QSO templates and than the majority of known QSOs. We analyze their FUV to NIR colors, luminosities and optical spectra. The sample includes a group of 150 objects at low redshift (z \(
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We analyze their FUV to NIR colors, luminosities and optical spectra. The sample includes a group of 150 objects at low redshift (z \(&lt;\) 0.5), and a group of 21 objects with redshift 1.7\(&lt;\)z\(&lt;\)2.6. For the low redshift objects, the "blue" FUV-NUV color may be caused by enhanced Ly\(\alpha\) emission, since Ly\(\alpha\) transits the GALEX FUV band from z=0.1 to z=0.47. Synthetic QSO templates constructed with Ly\(\alpha\) up to 3 times stronger than in standard templates match the observed UV colors of our low redshift sample. The H\(\alpha\) emission increases, and the optical spectra become bluer, with increasing absolute UV luminosity. The UV-blue QSOs at redshift about 2, where the GALEX bands sample restframe about 450-590A (FUV) and about 590-940A(NUV), are fainter than the average of UV-normal QSOs at similar redshift in NUV, while they have comparable luminosities in other bands. Therefore we speculate that their observed FUV-NUV color may be explained by a combination of steep flux rise towards short wavelengths and dust absorption below the Lyman limit, such as from small grains or crystalline carbon. The ratio of Ly\(\alpha\) to CIV could be measured in 10 objects; it is higher (30% on average) than for UV-normal QSOs, and close to the value expected for shock or collisional ionization. FULL VERSION AVAILABLE FROM AUTHOR'S WEB SITE: http://dolomiti.pha.jhu.edu/papers/2009_AJ_Extreme_UV_QSOs.pdf</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.0901.1896</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Color ; Emission spectra ; Ionization ; Luminosity ; Photometry ; Physics - Astrophysics of Galaxies ; Physics - Cosmology and Nongalactic Astrophysics ; Red shift ; Websites</subject><ispartof>arXiv.org, 2009-01</ispartof><rights>2009. 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Therefore we speculate that their observed FUV-NUV color may be explained by a combination of steep flux rise towards short wavelengths and dust absorption below the Lyman limit, such as from small grains or crystalline carbon. The ratio of Ly\(\alpha\) to CIV could be measured in 10 objects; it is higher (30% on average) than for UV-normal QSOs, and close to the value expected for shock or collisional ionization. FULL VERSION AVAILABLE FROM AUTHOR'S WEB SITE: http://dolomiti.pha.jhu.edu/papers/2009_AJ_Extreme_UV_QSOs.pdf</abstract><cop>Ithaca</cop><pub>Cornell University Library, arXiv.org</pub><doi>10.48550/arxiv.0901.1896</doi><oa>free_for_read</oa></addata></record>
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subjects Color
Emission spectra
Ionization
Luminosity
Photometry
Physics - Astrophysics of Galaxies
Physics - Cosmology and Nongalactic Astrophysics
Red shift
Websites
title Extreme UV QSOs
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