Spectral energy distribution variations of nearby Seyfert galaxies during AGN watch monitoring programs

Ece Kilerci Eser; Marianne Vestergaard

doi:10.1093/mnras/stx2689

Spectral energy distribution variations of nearby Seyfert galaxies during AGN watch monitoring programs

Ece Kilerci Eser, Marianne Vestergaard

DARK

2 Citationer (Scopus)

Abstract

We present and analyse quasi-simultaneous multi-epoch spectral energy distributions (SEDs) of seven reverberation-mapped active galactic nuclei (AGNs) for which accurate black hole mass measurements and suitable archival data are available from the 'AGNWatch' monitoring programs. We explore the potential of optical-UV and X-ray data, obtained within 2 d, to provide more accurate SED-based measurements of individualAGNand quantify the impact of source variability on key measurements typically used to characterize the black hole accretion process plus on bolometric correction factors at 5100 Å, 1350Å and for the 2-10 keV X-ray band, respectively. The largest SED changes occur on long time-scales (≳1 year). For our small sample, the 1μm to 10 keV integrated accretion luminosity typically changes by 10 per cent on short time-scales (over 20 d), by ~30 per cent over a year, but can change by 100 per cent or more for individual AGN. The extreme ultraviolet (EUV) gap is the most uncertain part of the intrinsic SED, introducing a ~25 per cent uncertainty in the accretion-induced luminosity, relative to the model independent interpolation method that we adopt. That aside, our analysis shows that the uncertainty in the accretion-induced luminosity, the Eddington luminosity ratio and the bolometric correction factors can be reduced (by a factor of two or more) by use of the SEDs built from data obtained within 20 d. However, M and η are mostly limited by the unknown EUV emission and the unknown details of the central engine and our aspect angle.

Originalsprog	Engelsk
Tidsskrift	Monthly Notices of the Royal Astronomical Society
Vol/bind	474
Udgave nummer	2
Sider (fra-til)	1590-1628
ISSN	0035-8711
DOI	https://doi.org/10.1093/mnras/stx2689
Status	Udgivet - 21 feb. 2018

Adgang til dokumentet

10.1093/mnras/stx2689

stx2689Forlagets udgivne version, 10,9 MB

https://arxiv.org/pdf/1710.07051.pdfLicens: Andet

Citationsformater

@article{ab281438dd6c46d2beb8d9f60d0922bf,

title = "Spectral energy distribution variations of nearby Seyfert galaxies during AGN watch monitoring programs",

abstract = "We present and analyse quasi-simultaneous multi-epoch spectral energy distributions (SEDs) of seven reverberation-mapped active galactic nuclei (AGNs) for which accurate black hole mass measurements and suitable archival data are available from the 'AGNWatch' monitoring programs. We explore the potential of optical-UV and X-ray data, obtained within 2 d, to provide more accurate SED-based measurements of individualAGNand quantify the impact of source variability on key measurements typically used to characterize the black hole accretion process plus on bolometric correction factors at 5100 {\AA}, 1350{\AA} and for the 2-10 keV X-ray band, respectively. The largest SED changes occur on long time-scales (≳1 year). For our small sample, the 1μm to 10 keV integrated accretion luminosity typically changes by 10 per cent on short time-scales (over 20 d), by ~30 per cent over a year, but can change by 100 per cent or more for individual AGN. The extreme ultraviolet (EUV) gap is the most uncertain part of the intrinsic SED, introducing a ~25 per cent uncertainty in the accretion-induced luminosity, relative to the model independent interpolation method that we adopt. That aside, our analysis shows that the uncertainty in the accretion-induced luminosity, the Eddington luminosity ratio and the bolometric correction factors can be reduced (by a factor of two or more) by use of the SEDs built from data obtained within 20 d. However, M and η are mostly limited by the unknown EUV emission and the unknown details of the central engine and our aspect angle.",

author = "{Kilerci Eser}, Ece and Marianne Vestergaard",

year = "2018",

month = feb,

day = "21",

doi = "10.1093/mnras/stx2689",

language = "English",

volume = "474",

pages = "1590--1628",

journal = "Royal Astronomical Society. Monthly Notices",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

TY - JOUR

T1 - Spectral energy distribution variations of nearby Seyfert galaxies during AGN watch monitoring programs

AU - Kilerci Eser, Ece

AU - Vestergaard, Marianne

PY - 2018/2/21

Y1 - 2018/2/21

N2 - We present and analyse quasi-simultaneous multi-epoch spectral energy distributions (SEDs) of seven reverberation-mapped active galactic nuclei (AGNs) for which accurate black hole mass measurements and suitable archival data are available from the 'AGNWatch' monitoring programs. We explore the potential of optical-UV and X-ray data, obtained within 2 d, to provide more accurate SED-based measurements of individualAGNand quantify the impact of source variability on key measurements typically used to characterize the black hole accretion process plus on bolometric correction factors at 5100 Å, 1350Å and for the 2-10 keV X-ray band, respectively. The largest SED changes occur on long time-scales (≳1 year). For our small sample, the 1μm to 10 keV integrated accretion luminosity typically changes by 10 per cent on short time-scales (over 20 d), by ~30 per cent over a year, but can change by 100 per cent or more for individual AGN. The extreme ultraviolet (EUV) gap is the most uncertain part of the intrinsic SED, introducing a ~25 per cent uncertainty in the accretion-induced luminosity, relative to the model independent interpolation method that we adopt. That aside, our analysis shows that the uncertainty in the accretion-induced luminosity, the Eddington luminosity ratio and the bolometric correction factors can be reduced (by a factor of two or more) by use of the SEDs built from data obtained within 20 d. However, M and η are mostly limited by the unknown EUV emission and the unknown details of the central engine and our aspect angle.

AB - We present and analyse quasi-simultaneous multi-epoch spectral energy distributions (SEDs) of seven reverberation-mapped active galactic nuclei (AGNs) for which accurate black hole mass measurements and suitable archival data are available from the 'AGNWatch' monitoring programs. We explore the potential of optical-UV and X-ray data, obtained within 2 d, to provide more accurate SED-based measurements of individualAGNand quantify the impact of source variability on key measurements typically used to characterize the black hole accretion process plus on bolometric correction factors at 5100 Å, 1350Å and for the 2-10 keV X-ray band, respectively. The largest SED changes occur on long time-scales (≳1 year). For our small sample, the 1μm to 10 keV integrated accretion luminosity typically changes by 10 per cent on short time-scales (over 20 d), by ~30 per cent over a year, but can change by 100 per cent or more for individual AGN. The extreme ultraviolet (EUV) gap is the most uncertain part of the intrinsic SED, introducing a ~25 per cent uncertainty in the accretion-induced luminosity, relative to the model independent interpolation method that we adopt. That aside, our analysis shows that the uncertainty in the accretion-induced luminosity, the Eddington luminosity ratio and the bolometric correction factors can be reduced (by a factor of two or more) by use of the SEDs built from data obtained within 20 d. However, M and η are mostly limited by the unknown EUV emission and the unknown details of the central engine and our aspect angle.

U2 - 10.1093/mnras/stx2689

DO - 10.1093/mnras/stx2689

M3 - Journal article

SN - 0035-8711

VL - 474

SP - 1590

EP - 1628

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

IS - 2

ER -

Spectral energy distribution variations of nearby Seyfert galaxies during AGN watch monitoring programs

Abstract

Adgang til dokumentet

Fingeraftryk

Citationsformater