Academic Journal
Swift Monitoring of NGC 4151: Evidence for a Second X-Ray/UV Reprocessing
| العنوان: | Swift Monitoring of NGC 4151: Evidence for a Second X-Ray/UV Reprocessing |
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| المؤلفون: | Edelson, R., Gelbord, J., Cackett, E., Connolly, S., Done, C., Fausnaugh, M., Gardner, E., Gehrels, N., Goad, Michael, Horne, K., McHardy, I, Peterson, B. M., Vaughan, Simon, Vestergaard, M., Breeveld, A., Barth, A. J., Bentz, M., Bottorff, M., Brandt, W. N., Crawford, S. M., Bonta, E. D., Emmanoulopoulos, D., Evans, Philip, Jaimes, R. F., Filippenko, A. V., Ferland, G., Grupe, D., Joner, M., Kennea, J., Korista, K. T., Krimm, H. A., Kriss, G., Leonard, D. C., Mathur, S., Netzer, H., Nousek, J., Page, Kate, Romero-Colmenero, E., Siegel, M., Starkey, D. A., Treu, T., Vogler, H. A., Winkler, H., Zheng, W. |
| بيانات النشر: | American Astronomical Society |
| سنة النشر: | 2018 |
| المجموعة: | University of Leicester: Leicester Research Archive (LRA) |
| مصطلحات موضوعية: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: active, galaxies: individual (NGC 4151), galaxies: nuclei, galaxies: Seyfert, ACTIVE GALACTIC NUCLEI, BROAD-LINE REGION, SHORT-TIMESCALE VARIABILITY, BLACK-HOLE MASS, CONTINUUM EMISSION, ACCRETION DISK, MULTIWAVELENGTH OBSERVATIONS, SPACE TELESCOPE, GALAXY NGC-4151, POWER-SPECTRUM |
| الوصف: | Swift monitoring of NGC 4151 with an ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3–50 keV) and six in the ultraviolet (UV)/optical (1900–5500 Å). The three hardest X-ray bands (>2.5 keV) are all strongly correlated with no measurable interband lag, while the two softer bands show lower variability and weaker correlations. The UV/optical bands are significantly correlated with the X-rays, lagging ~3–4 days behind the hard X-rays. The variability within the UV/optical bands is also strongly correlated, with the UV appearing to lead the optical by ~0.5–1 days. This combination of 3 day lags between the X-rays and UV and 1 day lags within the UV/optical appears to rule out the "lamp-post" reprocessing model in which a hot, X-ray emitting corona directly illuminates the accretion disk, which then reprocesses the energy in the UV/optical. Instead, these results appear consistent with the Gardner & Done picture in which two separate reprocessings occur: first, emission from the corona illuminates an extreme-UV-emitting toroidal component that shields the disk from the corona; this then heats the extreme-UV component, which illuminates the disk and drives its variability. ; Peer-reviewed ; Publisher Version |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 0004-637X 1538-4357 |
| Relation: | http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000400915200005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8c4e325952a993be76947405d4bce7d5; Astrophysical Journal, 2017, 840:41; http://iopscience.iop.org/article/10.3847/1538-4357/aa6890/meta; http://hdl.handle.net/2381/42044 |
| DOI: | 10.3847/1538-4357/aa6890/meta |
| DOI: | 10.3847/1538-4357/aa6890 |
| الاتاحة: | http://iopscience.iop.org/article/10.3847/1538-4357/aa6890/meta http://hdl.handle.net/2381/42044 https://doi.org/10.3847/1538-4357/aa6890 |
| Rights: | Copyright © 2017, American Astronomical Society. Deposited with reference to the publisher’s open access archiving policy. (http://www.rioxx.net/licenses/all-rights-reserved) |
| رقم الانضمام: | edsbas.DAB36AFA |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 0004637X 15384357 |
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| DOI: | 10.3847/1538-4357/aa6890/meta |