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Title: UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey

Abstract

We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$$_{\rm{QSO}}\gtrsim$$ 0.5; L$$_{\rm{bol}}>$$ 10$$^{46}$$ergs$$^{-1}$$) broad-line quasars at $1.5 < z < 2.7$. We combine the first year of deep, optical, ground-based observations from the Dark Energy Survey (DES) with the near infrared VISTA Hemisphere Survey (VHS) and UKIDSS Large Area Survey (ULAS) data, from which the reddened quasars were initially identified. We demonstrate that the significant dust reddening towards the quasar in our sample allows host galaxy emission to be detected at the rest-frame UV wavelengths probed by the DES photometry. By exploiting this reddening effect, we disentangle the quasar emission from that of the host galaxy via spectral energy distribution (SED) fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least ten quasars, with a further three quasars exhibiting emission consistent with either star formation or scattered light. From the rest-frame UV emission, we derive instantaneous, dust-corrected star formation rates (SFRs) in the range 25 < SFR$$_{\rm{UV}}$$ < 365 M$$_{\odot}$$yr$$^{-1}$$, with an average SFR$$_{\rm{UV}}$$ = 130 $$\pm$$ 95 M$$_{\odot}$$yr$$^{-1}$$. In conclusion, we find a broad correlation between SFR$$_{\rm{UV}}$$ and the bolometric quasar luminosity. Overall, our results show evidence for coeval star formation and black hole accretion occurring in luminous, reddened quasars at the peak epoch of galaxy formation.

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:
1423223
Alternate Identifier(s):
OSTI ID: 1426563
Report Number(s):
arXiv:1801.02635; FERMILAB-PUB-18-022-A-AD-AE-CD
Journal ID: ISSN 0035-8711; 1647255; TRN: US1801721
Grant/Contract Number:  
AC02-07CH11359; AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 475; Journal Issue: 3; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: evolution; galaxies: high-redshift; quasars: general; galaxies: star formation; ultraviolet: galaxies

Citation Formats

Wethers, C. F., Banerji, M., Hewett, P. C., Lemon, C. A., McMahon, R. G., Reed, S. L., Shen, Y., Abdalla, F. B., Benoit-Lévy, A., Brooks, D., Buckley-Geer, E., Capozzi, D., Carnero Rosell, A., CarrascoKind, M., Carretero, J., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., DePoy, D. L., Desai, S., Doel, P., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Jeltema, T., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., Martini, P., Menanteau, F., Miquel, R., Nichol, R. C., Nord, B., Plazas, A. A., Romer, A. K., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., and Walker, A. R. UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey. United States: N. p., 2018. Web. doi:10.1093/mnras/stx3332.
Wethers, C. F., Banerji, M., Hewett, P. C., Lemon, C. A., McMahon, R. G., Reed, S. L., Shen, Y., Abdalla, F. B., Benoit-Lévy, A., Brooks, D., Buckley-Geer, E., Capozzi, D., Carnero Rosell, A., CarrascoKind, M., Carretero, J., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., DePoy, D. L., Desai, S., Doel, P., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Jeltema, T., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., Martini, P., Menanteau, F., Miquel, R., Nichol, R. C., Nord, B., Plazas, A. A., Romer, A. K., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., & Walker, A. R. UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey. United States. doi:10.1093/mnras/stx3332.
Wethers, C. F., Banerji, M., Hewett, P. C., Lemon, C. A., McMahon, R. G., Reed, S. L., Shen, Y., Abdalla, F. B., Benoit-Lévy, A., Brooks, D., Buckley-Geer, E., Capozzi, D., Carnero Rosell, A., CarrascoKind, M., Carretero, J., Cunha, C. E., D'Andrea, C. B., da Costa, L. N., DePoy, D. L., Desai, S., Doel, P., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gerdes, D. W., Gruen, D., Gruendl, R. A., Gschwend, J., Gutierrez, G., Honscheid, K., James, D. J., Jeltema, T., Kuehn, K., Kuhlmann, S., Kuropatkin, N., Lima, M., Maia, M. A. G., Marshall, J. L., Martini, P., Menanteau, F., Miquel, R., Nichol, R. C., Nord, B., Plazas, A. A., Romer, A. K., Sanchez, E., Scarpine, V., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Soares-Santos, M., Sobreira, F., Suchyta, E., Tarle, G., and Walker, A. R. Fri . "UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey". United States. doi:10.1093/mnras/stx3332. https://www.osti.gov/servlets/purl/1423223.
@article{osti_1423223,
title = {UV-luminous, star-forming hosts of z ~ 2 reddened quasars in the Dark Energy Survey},
author = {Wethers, C. F. and Banerji, M. and Hewett, P. C. and Lemon, C. A. and McMahon, R. G. and Reed, S. L. and Shen, Y. and Abdalla, F. B. and Benoit-Lévy, A. and Brooks, D. and Buckley-Geer, E. and Capozzi, D. and Carnero Rosell, A. and CarrascoKind, M. and Carretero, J. and Cunha, C. E. and D'Andrea, C. B. and da Costa, L. N. and DePoy, D. L. and Desai, S. and Doel, P. and Flaugher, B. and Fosalba, P. and Frieman, J. and García-Bellido, J. and Gerdes, D. W. and Gruen, D. and Gruendl, R. A. and Gschwend, J. and Gutierrez, G. and Honscheid, K. and James, D. J. and Jeltema, T. and Kuehn, K. and Kuhlmann, S. and Kuropatkin, N. and Lima, M. and Maia, M. A. G. and Marshall, J. L. and Martini, P. and Menanteau, F. and Miquel, R. and Nichol, R. C. and Nord, B. and Plazas, A. A. and Romer, A. K. and Sanchez, E. and Scarpine, V. and Schindler, R. and Schubnell, M. and Sevilla-Noarbe, I. and Smith, M. and Smith, R. C. and Soares-Santos, M. and Sobreira, F. and Suchyta, E. and Tarle, G. and Walker, A. R.},
abstractNote = {We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$_{\rm{QSO}}\gtrsim$ 0.5; L$_{\rm{bol}}>$ 10$^{46}$ergs$^{-1}$) broad-line quasars at $1.5 < z < 2.7$. We combine the first year of deep, optical, ground-based observations from the Dark Energy Survey (DES) with the near infrared VISTA Hemisphere Survey (VHS) and UKIDSS Large Area Survey (ULAS) data, from which the reddened quasars were initially identified. We demonstrate that the significant dust reddening towards the quasar in our sample allows host galaxy emission to be detected at the rest-frame UV wavelengths probed by the DES photometry. By exploiting this reddening effect, we disentangle the quasar emission from that of the host galaxy via spectral energy distribution (SED) fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least ten quasars, with a further three quasars exhibiting emission consistent with either star formation or scattered light. From the rest-frame UV emission, we derive instantaneous, dust-corrected star formation rates (SFRs) in the range 25 < SFR$_{\rm{UV}}$ < 365 M$_{\odot}$yr$^{-1}$, with an average SFR$_{\rm{UV}}$ = 130 $\pm$ 95 M$_{\odot}$yr$^{-1}$. In conclusion, we find a broad correlation between SFR$_{\rm{UV}}$ and the bolometric quasar luminosity. Overall, our results show evidence for coeval star formation and black hole accretion occurring in luminous, reddened quasars at the peak epoch of galaxy formation.},
doi = {10.1093/mnras/stx3332},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 475,
place = {United States},
year = {2018},
month = {1}
}

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