Measurement of the broad-line region size in a luminous macho quasar

Doron Chelouche; Eliran Daniel; Shai Kaspi

doi:10.1088/2041-8205/750/2/L43

Measurement of the broad-line region size in a luminous macho quasar

Doron Chelouche, Eliran Daniel, Shai Kaspi

University of Haifa, Technion - Israel Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

We measure the broad emission line region (BLR) size of a luminous, L 10⁴⁷ erg s^-1, high-z quasar using broadband photometric reverberation mapping. To this end, we analyze 7.5 years of photometric data for MACHO13.6805.324 (z ≃ 1.72) in the B and R MACHO bands and find a time delay of 180 ± 40days in the rest frame of the object. Given the spectral-variability properties of high-z quasars, we associate this lag with the rest-UV iron emission blends. Our findings are consistent with a simple extrapolation of the BLR size-luminosity relation in local active galactic nuclei to the more luminous, high-z quasar population. Long-term spectroscopic monitoring of MACHO13.6805.324 may be able to directly measure the line-to-continuum time delay and test our findings.

Original language	American English
Article number	L43
Journal	Astrophysical Journal Letters
Volume	750
Issue number	2
DOIs	https://doi.org/10.1088/2041-8205/750/2/L43
State	Published - 10 May 2012

Keywords

galaxies: active
methods: data analysis
quasars: emission lines
quasars: individual (MACHO 13.6805.324)
techniques: photometric

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/2041-8205/750/2/L43

Cite this

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title = "Measurement of the broad-line region size in a luminous macho quasar",

abstract = "We measure the broad emission line region (BLR) size of a luminous, L 1047 erg s-1, high-z quasar using broadband photometric reverberation mapping. To this end, we analyze 7.5 years of photometric data for MACHO13.6805.324 (z ≃ 1.72) in the B and R MACHO bands and find a time delay of 180 ± 40days in the rest frame of the object. Given the spectral-variability properties of high-z quasars, we associate this lag with the rest-UV iron emission blends. Our findings are consistent with a simple extrapolation of the BLR size-luminosity relation in local active galactic nuclei to the more luminous, high-z quasar population. Long-term spectroscopic monitoring of MACHO13.6805.324 may be able to directly measure the line-to-continuum time delay and test our findings.",

keywords = "galaxies: active, methods: data analysis, quasars: emission lines, quasars: individual (MACHO 13.6805.324), techniques: photometric",

author = "Doron Chelouche and Eliran Daniel and Shai Kaspi",

year = "2012",

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doi = "10.1088/2041-8205/750/2/L43",

language = "American English",

volume = "750",

journal = "Astrophysical Journal Letters",

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publisher = "American Astronomical Society",

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TY - JOUR

T1 - Measurement of the broad-line region size in a luminous macho quasar

AU - Chelouche, Doron

AU - Daniel, Eliran

AU - Kaspi, Shai

PY - 2012/5/10

Y1 - 2012/5/10

N2 - We measure the broad emission line region (BLR) size of a luminous, L 1047 erg s-1, high-z quasar using broadband photometric reverberation mapping. To this end, we analyze 7.5 years of photometric data for MACHO13.6805.324 (z ≃ 1.72) in the B and R MACHO bands and find a time delay of 180 ± 40days in the rest frame of the object. Given the spectral-variability properties of high-z quasars, we associate this lag with the rest-UV iron emission blends. Our findings are consistent with a simple extrapolation of the BLR size-luminosity relation in local active galactic nuclei to the more luminous, high-z quasar population. Long-term spectroscopic monitoring of MACHO13.6805.324 may be able to directly measure the line-to-continuum time delay and test our findings.

AB - We measure the broad emission line region (BLR) size of a luminous, L 1047 erg s-1, high-z quasar using broadband photometric reverberation mapping. To this end, we analyze 7.5 years of photometric data for MACHO13.6805.324 (z ≃ 1.72) in the B and R MACHO bands and find a time delay of 180 ± 40days in the rest frame of the object. Given the spectral-variability properties of high-z quasars, we associate this lag with the rest-UV iron emission blends. Our findings are consistent with a simple extrapolation of the BLR size-luminosity relation in local active galactic nuclei to the more luminous, high-z quasar population. Long-term spectroscopic monitoring of MACHO13.6805.324 may be able to directly measure the line-to-continuum time delay and test our findings.

KW - galaxies: active

KW - methods: data analysis

KW - quasars: emission lines

KW - quasars: individual (MACHO 13.6805.324)

KW - techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=84860328436&partnerID=8YFLogxK

U2 - 10.1088/2041-8205/750/2/L43

DO - 10.1088/2041-8205/750/2/L43

M3 - Article

SN - 2041-8205

VL - 750

JO - Astrophysical Journal Letters

JF - Astrophysical Journal Letters

IS - 2

M1 - L43

ER -

Measurement of the broad-line region size in a luminous macho quasar

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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