The variable iron K emission line in MCG-6-30-15

K. Iwasawa, A. C. Fabian, C. S. Reynolds, K. Nandra, C. Otani, H. Inoue, K. Hayashida, W. N. Brandt, T. Dotani, H. Kunieda, M. Matsuoka, Y. Tanaka

Research output: Contribution to journalArticle

244 Citations (Scopus)

Abstract

We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG-6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and a broad red wing extending to below 5 keV, which are interpreted as line emission arising from the inner parts of an accretion disc. The narrow core correlates well with the continuum flux whereas the broad wing weakly anticorrelates. When the source is brightest, the line is dominated by the narrow core, whilst, during a deep minimum, the narrow core is very weak and a huge red tail appears. However, at other times when the continuum shows rather rapid changes, the broad wing is more variable than the narrow core, and shows evidence for correlated changes contrary to its long-time-scale behaviour. The peculiar line profile during the deep minimum spectrum suggests that the line-emitting region is very close to a central spinning (Kerr) black hole where enormous gravitational effects operate.

Original languageEnglish (US)
Pages (from-to)1038-1048
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Volume282
Issue number3
DOIs
StatePublished - Jan 1 1996

Fingerprint

iron
wings
continuums
gravitational effects
accretion
timescale
accretion disks
metal spinning
energy
galaxies
profiles
effect

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Iwasawa, K., Fabian, A. C., Reynolds, C. S., Nandra, K., Otani, C., Inoue, H., ... Tanaka, Y. (1996). The variable iron K emission line in MCG-6-30-15. Monthly Notices of the Royal Astronomical Society, 282(3), 1038-1048. https://doi.org/10.1093/mnras/282.3.1038
Iwasawa, K. ; Fabian, A. C. ; Reynolds, C. S. ; Nandra, K. ; Otani, C. ; Inoue, H. ; Hayashida, K. ; Brandt, W. N. ; Dotani, T. ; Kunieda, H. ; Matsuoka, M. ; Tanaka, Y. / The variable iron K emission line in MCG-6-30-15. In: Monthly Notices of the Royal Astronomical Society. 1996 ; Vol. 282, No. 3. pp. 1038-1048.
@article{36c3a676ca124bbb98ee38da79bf6eae,
title = "The variable iron K emission line in MCG-6-30-15",
abstract = "We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG-6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and a broad red wing extending to below 5 keV, which are interpreted as line emission arising from the inner parts of an accretion disc. The narrow core correlates well with the continuum flux whereas the broad wing weakly anticorrelates. When the source is brightest, the line is dominated by the narrow core, whilst, during a deep minimum, the narrow core is very weak and a huge red tail appears. However, at other times when the continuum shows rather rapid changes, the broad wing is more variable than the narrow core, and shows evidence for correlated changes contrary to its long-time-scale behaviour. The peculiar line profile during the deep minimum spectrum suggests that the line-emitting region is very close to a central spinning (Kerr) black hole where enormous gravitational effects operate.",
author = "K. Iwasawa and Fabian, {A. C.} and Reynolds, {C. S.} and K. Nandra and C. Otani and H. Inoue and K. Hayashida and Brandt, {W. N.} and T. Dotani and H. Kunieda and M. Matsuoka and Y. Tanaka",
year = "1996",
month = "1",
day = "1",
doi = "10.1093/mnras/282.3.1038",
language = "English (US)",
volume = "282",
pages = "1038--1048",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "3",

}

Iwasawa, K, Fabian, AC, Reynolds, CS, Nandra, K, Otani, C, Inoue, H, Hayashida, K, Brandt, WN, Dotani, T, Kunieda, H, Matsuoka, M & Tanaka, Y 1996, 'The variable iron K emission line in MCG-6-30-15', Monthly Notices of the Royal Astronomical Society, vol. 282, no. 3, pp. 1038-1048. https://doi.org/10.1093/mnras/282.3.1038

The variable iron K emission line in MCG-6-30-15. / Iwasawa, K.; Fabian, A. C.; Reynolds, C. S.; Nandra, K.; Otani, C.; Inoue, H.; Hayashida, K.; Brandt, W. N.; Dotani, T.; Kunieda, H.; Matsuoka, M.; Tanaka, Y.

In: Monthly Notices of the Royal Astronomical Society, Vol. 282, No. 3, 01.01.1996, p. 1038-1048.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The variable iron K emission line in MCG-6-30-15

AU - Iwasawa, K.

AU - Fabian, A. C.

AU - Reynolds, C. S.

AU - Nandra, K.

AU - Otani, C.

AU - Inoue, H.

AU - Hayashida, K.

AU - Brandt, W. N.

AU - Dotani, T.

AU - Kunieda, H.

AU - Matsuoka, M.

AU - Tanaka, Y.

PY - 1996/1/1

Y1 - 1996/1/1

N2 - We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG-6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and a broad red wing extending to below 5 keV, which are interpreted as line emission arising from the inner parts of an accretion disc. The narrow core correlates well with the continuum flux whereas the broad wing weakly anticorrelates. When the source is brightest, the line is dominated by the narrow core, whilst, during a deep minimum, the narrow core is very weak and a huge red tail appears. However, at other times when the continuum shows rather rapid changes, the broad wing is more variable than the narrow core, and shows evidence for correlated changes contrary to its long-time-scale behaviour. The peculiar line profile during the deep minimum spectrum suggests that the line-emitting region is very close to a central spinning (Kerr) black hole where enormous gravitational effects operate.

AB - We report on the variability of the iron K emission line in the Seyfert 1 galaxy MCG-6-30-15 during a four-day ASCA observation. The line consists of a narrow core at an energy of about 6.4 keV, and a broad red wing extending to below 5 keV, which are interpreted as line emission arising from the inner parts of an accretion disc. The narrow core correlates well with the continuum flux whereas the broad wing weakly anticorrelates. When the source is brightest, the line is dominated by the narrow core, whilst, during a deep minimum, the narrow core is very weak and a huge red tail appears. However, at other times when the continuum shows rather rapid changes, the broad wing is more variable than the narrow core, and shows evidence for correlated changes contrary to its long-time-scale behaviour. The peculiar line profile during the deep minimum spectrum suggests that the line-emitting region is very close to a central spinning (Kerr) black hole where enormous gravitational effects operate.

UR - http://www.scopus.com/inward/record.url?scp=1542606598&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1542606598&partnerID=8YFLogxK

U2 - 10.1093/mnras/282.3.1038

DO - 10.1093/mnras/282.3.1038

M3 - Article

AN - SCOPUS:1542606598

VL - 282

SP - 1038

EP - 1048

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 3

ER -

Iwasawa K, Fabian AC, Reynolds CS, Nandra K, Otani C, Inoue H et al. The variable iron K emission line in MCG-6-30-15. Monthly Notices of the Royal Astronomical Society. 1996 Jan 1;282(3):1038-1048. https://doi.org/10.1093/mnras/282.3.1038