The DOI matches its Crossref record; 46 of the 46 references it cites were found in a registry or an index.
THE SIMULTANEOUS OPTICAL-TO-X-RAY SPECTRAL ENERGY DISTRIBUTION OF SOFT X-RAY SELECTED ACTIVE GALACTIC NUCLEI OBSERVED BY SWIFT
Open accessAbstract
We report Swift observations of a sample of 92 bright soft X-ray selected active galactic nuclei (AGN). This sample represents the largest number of AGN observed to study the spectral energy distribution (SED) of AGN with simultaneous optical/UV and X-ray data. The principal motivation of this study is to understand the SEDs of AGN in the optical/UV to X-ray regime and to provide bolometric corrections which are important in determining the Eddington ratio L/Ledd. In particular, we rigorously explore the dependence of the UV-EUV contribution to the bolometric correction on the assumed EUV spectral shape. We find strong correlations of the spectral slopes alpha-x and alpha-UV with L/Ledd. Although Narrow-Line Seyfert 1 galaxies (NLS1s) have steeper alpha-x and higher L/Ledd than Broad-Line Seyfert 1 galaxies (BLS1s), their optical/UV to X-ray spectral slopes alpha-ox and optical/UV slopes alpha-UV are very similar. The mean SED of NLS1s shows that in general this type of AGN appears to be fainter in the UV and at hard X-ray energies than BLS1s. We find a strong correlation between alpha-x and alpha-UV for AGN with X-ray spectral slopes alpha-x<1.6. For AGN with steeper X-ray spectra, both this relation and the relation between alpha-x and L/Ledd break down. At alpha-x$\approx$1.6, L/Ledd reaches unity. We note an offset in the alpha-UV - L/Ledd relation between NLS1s and BLS1s. We argue that alpha-UV is a good estimator of L/Ledd and suggest that alpha-UV can be used to estimate L/Ledd in high-redshift QSOs. Although NLS1s appear to be highly variable in X-rays they only vary marginally in the UV.
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Cites
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Cited by
Shappee, B. J., Prieto, J. L., Grupe, D., Kochanek, C. S., Stanek, K. Z., De Rosa, G., Mathur, S., Zu, Y., Peterson, B. M., Pogge, R. W., et al. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/788/1/48 · Cited by 1,887
Self-citationCosmological constraints from the Hubble diagram of quasars at high redshifts
Risaliti, G., & Lusso, E. (2019) · Nature Astronomy · doi:10.1038/s41550-018-0657-z · Cited by 371
Giustini, M., & Proga, D. (2019) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201833810 · Cited by 166
Metadata
- Authors
- Grupe, D., Komossa, S., Leighly, K. M., & Page, K. L.
- Venue
- The Astrophysical Journal Supplement Series
- Publisher
- American Astronomical Society
- Published
- 2010-02-23
- Volume
- 187
- Issue
- 1
- Pages
- 64-106
- ISSN
- 0067-0049 (ISSN-L)
- 1538-4365
- OpenAlex
- W2001144908
- Cited by
- 271
- References
- 46
- FWCI
- 14.41
- Type
- journal article
- Language
- en
- Open access
- green
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- Grupe, D., Komossa, S., Leighly, K. M., & Page, K. L. (2010). THE SIMULTANEOUS OPTICAL-TO-X-RAY SPECTRAL ENERGY DISTRIBUTION OF SOFT X-RAY SELECTED ACTIVE GALACTIC NUCLEI OBSERVED BY SWIFT. The Astrophysical Journal Supplement Series. https://doi.org/10.1088/0067-0049/187/1/64
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