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Title: Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey

Abstract

We present accretion disk size measurements for 15 luminous quasars at 0.7 ≤ z ≤ 1.9 derived from griz light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum emission at a given radius is well described by a single blackbody. Here in the first method we measure the relative lags between the multiband light curves, which provides the relative time lag between shorter and longer wavelength variations. From this, we are only able to constrain upper limits on disk sizes, as many are consistent with no lag the 2σ level. The second method fits the model parameters for the canonical thin disk directly rather than solving for the individual time lags between the light curves. Our measurements demonstrate good agreement with the sizes predicted by this model for accretion rates between 0.3 and 1 times the Eddington rate. Given our large uncertainties, our measurements are also consistent with disk size measurements from gravitational microlensing studies of strongly lensed quasars, as well as other photometric reverberation mapping results, that find disk sizes that are a factormore » of a few (~3) larger than predictions.« less

Authors:
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Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC-21)
Contributing Org.:
DES Collaboration
OSTI Identifier:
1423227
Alternate Identifier(s):
OSTI ID: 1468023
Report Number(s):
arXiv:1711.11588; FERMILAB-PUB-17-506-E
Journal ID: ISSN 1538-4357; 1641493
Grant/Contract Number:  
AC02-07CH11359; AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 862; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Mudd, D., Martini, P., Zu, Y., Kochanek, C., Peterson, B. M., Kessler, R., Davis, T. M., Hoormann, J. K., King, A., Lidman, C., Sommer, N. E., Tucker, B. E., Asorey, J., Hinton, S., Glazebrook, K., Kuehn, K., Lewis, G., Macaulay, E., Moeller, A., O’Neill, C., Zhang, B., Abbott, T. M. C., Abdalla, F. B., Allam, S., Banerji, M., Benoit-Lévy, A., Bertin, E., Brooks, D., Rosell, A. Carnero, Carollo, D., Kind, M. Carrasco, Carretero, J., Cunha, C. E., D’Andrea, C. B., Costa, L. N. da, Davis, C., Desai, S., Doel, P., Fosalba, P., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hartley, W. G., Honscheid, K., James, D. J., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Plazas, A. A., Romer, A. K., Sanchez, E., Schindler, R., Schubnell, M., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., Tucker, D. L., and Walker, A. R. Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aac9bb.
Mudd, D., Martini, P., Zu, Y., Kochanek, C., Peterson, B. M., Kessler, R., Davis, T. M., Hoormann, J. K., King, A., Lidman, C., Sommer, N. E., Tucker, B. E., Asorey, J., Hinton, S., Glazebrook, K., Kuehn, K., Lewis, G., Macaulay, E., Moeller, A., O’Neill, C., Zhang, B., Abbott, T. M. C., Abdalla, F. B., Allam, S., Banerji, M., Benoit-Lévy, A., Bertin, E., Brooks, D., Rosell, A. Carnero, Carollo, D., Kind, M. Carrasco, Carretero, J., Cunha, C. E., D’Andrea, C. B., Costa, L. N. da, Davis, C., Desai, S., Doel, P., Fosalba, P., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hartley, W. G., Honscheid, K., James, D. J., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Plazas, A. A., Romer, A. K., Sanchez, E., Schindler, R., Schubnell, M., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., Tucker, D. L., & Walker, A. R. Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey. United States. doi:10.3847/1538-4357/aac9bb.
Mudd, D., Martini, P., Zu, Y., Kochanek, C., Peterson, B. M., Kessler, R., Davis, T. M., Hoormann, J. K., King, A., Lidman, C., Sommer, N. E., Tucker, B. E., Asorey, J., Hinton, S., Glazebrook, K., Kuehn, K., Lewis, G., Macaulay, E., Moeller, A., O’Neill, C., Zhang, B., Abbott, T. M. C., Abdalla, F. B., Allam, S., Banerji, M., Benoit-Lévy, A., Bertin, E., Brooks, D., Rosell, A. Carnero, Carollo, D., Kind, M. Carrasco, Carretero, J., Cunha, C. E., D’Andrea, C. B., Costa, L. N. da, Davis, C., Desai, S., Doel, P., Fosalba, P., García-Bellido, J., Gaztanaga, E., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hartley, W. G., Honscheid, K., James, D. J., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., McMahon, R. G., Menanteau, F., Miquel, R., Plazas, A. A., Romer, A. K., Sanchez, E., Schindler, R., Schubnell, M., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Thomas, D., Tucker, D. L., and Walker, A. R. Mon . "Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey". United States. doi:10.3847/1538-4357/aac9bb.
@article{osti_1423227,
title = {Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey},
author = {Mudd, D. and Martini, P. and Zu, Y. and Kochanek, C. and Peterson, B. M. and Kessler, R. and Davis, T. M. and Hoormann, J. K. and King, A. and Lidman, C. and Sommer, N. E. and Tucker, B. E. and Asorey, J. and Hinton, S. and Glazebrook, K. and Kuehn, K. and Lewis, G. and Macaulay, E. and Moeller, A. and O’Neill, C. and Zhang, B. and Abbott, T. M. C. and Abdalla, F. B. and Allam, S. and Banerji, M. and Benoit-Lévy, A. and Bertin, E. and Brooks, D. and Rosell, A. Carnero and Carollo, D. and Kind, M. Carrasco and Carretero, J. and Cunha, C. E. and D’Andrea, C. B. and Costa, L. N. da and Davis, C. and Desai, S. and Doel, P. and Fosalba, P. and García-Bellido, J. and Gaztanaga, E. and Gerdes, D. W. and Gruen, D. and Gruendl, R. A. and Gschwend, J. and Gutierrez, G. and Hartley, W. G. and Honscheid, K. and James, D. J. and Kuhlmann, S. and Kuropatkin, N. and Lima, M. and Maia, M. A. G. and Marshall, J. L. and McMahon, R. G. and Menanteau, F. and Miquel, R. and Plazas, A. A. and Romer, A. K. and Sanchez, E. and Schindler, R. and Schubnell, M. and Smith, M. and Smith, R. C. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Swanson, M. E. C. and Tarle, G. and Thomas, D. and Tucker, D. L. and Walker, A. R.},
abstractNote = {We present accretion disk size measurements for 15 luminous quasars at 0.7 ≤ z ≤ 1.9 derived from griz light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum emission at a given radius is well described by a single blackbody. Here in the first method we measure the relative lags between the multiband light curves, which provides the relative time lag between shorter and longer wavelength variations. From this, we are only able to constrain upper limits on disk sizes, as many are consistent with no lag the 2σ level. The second method fits the model parameters for the canonical thin disk directly rather than solving for the individual time lags between the light curves. Our measurements demonstrate good agreement with the sizes predicted by this model for accretion rates between 0.3 and 1 times the Eddington rate. Given our large uncertainties, our measurements are also consistent with disk size measurements from gravitational microlensing studies of strongly lensed quasars, as well as other photometric reverberation mapping results, that find disk sizes that are a factor of a few (~3) larger than predictions.},
doi = {10.3847/1538-4357/aac9bb},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 862,
place = {United States},
year = {Mon Jul 30 00:00:00 EDT 2018},
month = {Mon Jul 30 00:00:00 EDT 2018}
}

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