BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD
In order to investigate the growth of supermassive black holes (SMBHs), we construct the black hole mass function (BHMF) and Eddington ratio distribution function (ERDF) of X-ray-selected broad-line active galactic nuclei (AGNs) at z ∼ 1.4 in the Subaru XMM-Newton Deep Survey (SXDS) field. A signifi...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1826290201050218496 |
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| author | Nobuta, K Akiyama, M Ueda, Y Watson, MG Silverman, J Hiroi, K Ohta, K Iwamuro, F Yabe, K Tamura, N Moritani, Y Sumiyoshi, M Takato, N Kimura, M Maihara, T Dalton, G Lewis, I Bonfield, D Lee, H Curtis-Lake, E Macaulay, E Clarke, F Sekiguchi, K Simpson, C Croom, S |
| author_facet | Nobuta, K Akiyama, M Ueda, Y Watson, MG Silverman, J Hiroi, K Ohta, K Iwamuro, F Yabe, K Tamura, N Moritani, Y Sumiyoshi, M Takato, N Kimura, M Maihara, T Dalton, G Lewis, I Bonfield, D Lee, H Curtis-Lake, E Macaulay, E Clarke, F Sekiguchi, K Simpson, C Croom, S |
| author_sort | Nobuta, K |
| collection | OXFORD |
| description | In order to investigate the growth of supermassive black holes (SMBHs), we construct the black hole mass function (BHMF) and Eddington ratio distribution function (ERDF) of X-ray-selected broad-line active galactic nuclei (AGNs) at z ∼ 1.4 in the Subaru XMM-Newton Deep Survey (SXDS) field. A significant part of the accretion growth of SMBHs is thought to take place in this redshift range. Black hole masses of X-ray-selected broad-line AGNs are estimated using the width of the broad Mg II line and 3000 Å monochromatic luminosity. We supplement the Mg II FWHM values with the Hα FWHM obtained from our NIR spectroscopic survey. Using the black hole masses of broad-line AGNs at redshifts between 1.18 and 1.68, the binned broad-line AGN BHMFs and ERDFs are calculated using the V maxmethod. To properly account for selection effects that impact the binned estimates, we derive the corrected broad-line AGN BHMFs and ERDFs by applying the maximum likelihood method, assuming that the ERDF is constant regardless of the black hole mass. We do not correct for the non-negligible uncertainties in virial BH mass estimates. If we compare the corrected broad-line AGN BHMF with that in the local universe, then the corrected BHMF at z = 1.4 has a higher number density above 108 M⊙but a lower number density below that mass range. The evolution may be indicative of a downsizing trend of accretion activity among the SMBH population. The evolution of broad-line AGN ERDFs from z = 1.4 to 0 indicates that the fraction of broad-line AGNs with accretion rates close to the Eddington limit is higher at higher redshifts. © 2012. The American Astronomical Society. All rights reserved.. |
| first_indexed | 2024-03-07T02:40:33Z |
| format | Journal article |
| id | oxford-uuid:aa4bbd1e-68f3-4897-a384-e6058d0db3e2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:40:33Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:aa4bbd1e-68f3-4897-a384-e6058d0db3e22022-03-27T03:14:19ZBLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELDJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:aa4bbd1e-68f3-4897-a384-e6058d0db3e2EnglishSymplectic Elements at Oxford2012Nobuta, KAkiyama, MUeda, YWatson, MGSilverman, JHiroi, KOhta, KIwamuro, FYabe, KTamura, NMoritani, YSumiyoshi, MTakato, NKimura, MMaihara, TDalton, GLewis, IBonfield, DLee, HCurtis-Lake, EMacaulay, EClarke, FSekiguchi, KSimpson, CCroom, SIn order to investigate the growth of supermassive black holes (SMBHs), we construct the black hole mass function (BHMF) and Eddington ratio distribution function (ERDF) of X-ray-selected broad-line active galactic nuclei (AGNs) at z ∼ 1.4 in the Subaru XMM-Newton Deep Survey (SXDS) field. A significant part of the accretion growth of SMBHs is thought to take place in this redshift range. Black hole masses of X-ray-selected broad-line AGNs are estimated using the width of the broad Mg II line and 3000 Å monochromatic luminosity. We supplement the Mg II FWHM values with the Hα FWHM obtained from our NIR spectroscopic survey. Using the black hole masses of broad-line AGNs at redshifts between 1.18 and 1.68, the binned broad-line AGN BHMFs and ERDFs are calculated using the V maxmethod. To properly account for selection effects that impact the binned estimates, we derive the corrected broad-line AGN BHMFs and ERDFs by applying the maximum likelihood method, assuming that the ERDF is constant regardless of the black hole mass. We do not correct for the non-negligible uncertainties in virial BH mass estimates. If we compare the corrected broad-line AGN BHMF with that in the local universe, then the corrected BHMF at z = 1.4 has a higher number density above 108 M⊙but a lower number density below that mass range. The evolution may be indicative of a downsizing trend of accretion activity among the SMBH population. The evolution of broad-line AGN ERDFs from z = 1.4 to 0 indicates that the fraction of broad-line AGNs with accretion rates close to the Eddington limit is higher at higher redshifts. © 2012. The American Astronomical Society. All rights reserved.. |
| spellingShingle | Nobuta, K Akiyama, M Ueda, Y Watson, MG Silverman, J Hiroi, K Ohta, K Iwamuro, F Yabe, K Tamura, N Moritani, Y Sumiyoshi, M Takato, N Kimura, M Maihara, T Dalton, G Lewis, I Bonfield, D Lee, H Curtis-Lake, E Macaulay, E Clarke, F Sekiguchi, K Simpson, C Croom, S BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title | BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title_full | BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title_fullStr | BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title_full_unstemmed | BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title_short | BLACK HOLE MASS AND EDDINGTON RATIO DISTRIBUTION FUNCTIONS OF X-RAY-SELECTED BROAD-LINE AGNs AT z similar to 1.4 IN THE SUBARU XMM-NEWTON DEEP FIELD |
| title_sort | black hole mass and eddington ratio distribution functions of x ray selected broad line agns at z similar to 1 4 in the subaru xmm newton deep field |
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