ROSAT monitoring of persistent giant and rapid variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809

Boiler, Th.; Brandt, W. N.; Fabian, A. C.; Fink, H. H.

doi:10.1093/mnras/289.2.393

Cited by 129 publications

(104 citation statements)

References 42 publications

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“…Therefore if our modeling is correct, either the molecular torus is geometrically thin, optically thin, patchy, or absent altogether or the planes of the AD and the torus are more orthogonal than coincident. Boller et al (1997) suggested that NLS1s in general may contain disks viewed relatively face-on which would contradict the results of our modeling. However, they based this hypothesis on the high levels of variability seen in many NLS1s (and in IRAS 13224È3809 in particular), and RE J1034]396 has shown only relatively small changes over long timescales.…”

Section: Black Hole Mass and Accretion Ratecontrasting

confidence: 90%

“…They have very strong soft X-ray excesses (Puchnarewicz et al 1992 ;Boller, Brandt, & Fink 1996), are often highly variable (Brandt, Fabian, & Pounds 1996 ;Boller et al 1997), and, in some cases, the optical/UV big blue bump (BBB) component is so hot that it is shifted into the UV/EUV regime, leaving a bare, power-lawÈlike continuum component in the optical (Puchnarewicz et al 1995).…”

Section: Introductionmentioning

confidence: 99%

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Constraining the Black Hole Mass and Accretion Rate in the Narrow‐Line Seyfert 1 Galaxy RE J1034+396

Puchnarewicz¹,

Mason²,

Siemiginowska

et al. 2001

ApJ

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We present a comprehensive study of the spectrum of the narrow-line Seyfert 1 (NLS1) galaxy RE J1034]396, summarizing the information obtained from the optical to X-rays with observations from the William Herschel 4.2 m Telescope, the Hubble Space T elescope, the Extreme Ultraviolet Explorer, ROSAT , ASCA, and BeppoSAX. The BeppoSAX spectra reveal a soft component which is well represented by two blackbodies with and 160 eV, mimicking that expected from a hot, optically kT eff \ 60 thick accretion disk around a low-mass black hole. This is borne out by our modeling of the opticalÈtoÈ X-ray nuclear continuum, which constrains the physical parameters of a NLS1 for the Ðrst time. The models demonstrate that RE J1034]396 is likely to be a system with a nearly edge-on accretion disk (60¡È75¡ from the disk axis), accreting at nearly Eddington rates onto a low-mass black (0.3È0.7L Edd ) hole This is consistent with the hypothesis that NLS1s are Seyfert-scale ana-. logies of galactic black hole candidates. The unusually high temperature of the big blue bump reveals a Ñat power-lawÈlike continuum in the optical/UV which is consistent with an extrapolation to the hard X-ray power law, and which we speculate may be similar to the continuum component observed in BL Lac objects in their quiescent periods. From the BeppoSAX and ASCA data, we Ðnd that the slope of the hard X-ray power law depends very much on the form of the soft component which is assumed. For our best-Ðtting models, it lies somewhere between a \ 0.7 and 1.3 and thus may not be signiÐcantly softer than active galactic nuclei in general.

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Section: Black Hole Mass and Accretion Ratecontrasting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Constraining the Black Hole Mass and Accretion Rate in the Narrow‐Line Seyfert 1 Galaxy RE J1034+396

Puchnarewicz¹,

Mason²,

Siemiginowska

et al. 2001

ApJ

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“…They showed fractional amplitudes of variability that were among the largest in a sample of NLS1's observed by ASCA (Leighly 1999a). ROSAT monitoring observations of IRAS 13224À3809 found strong soft X-ray flaring by up to a factor of 60 in as short a time interval as 2 days (Boller et al 1997). Large-amplitude X-ray variability was also reported during a long ASCA observation (Dewangen et al 2002).…”

Section: Targg Etsmentioning

confidence: 76%

Hubble Space TelescopeSTIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow‐Line Seyfert 1 Galaxies. I. Data and Analysis

Leighly

Moore

2004

ApJ

145

175

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We present Hubble Space Telescope (HST ) Space Telescope Imaging Spectrograph observations of two extreme narrow-line Seyfert 1 galaxies ( NLS1's), IRAS 13224À3809 and 1H 0707À495. The spectra are characterized by very blue continua; broad, strongly blueshifted high-ionization lines (including C iv and N v); and narrow, symmetric intermediate-(including C iii], Si iii], and Al iii) and low-ionization (e.g., Mg ii) lines centered at the rest wavelength. The emission-line profiles suggest that the high-ionization lines are produced in a wind and that the intermediate-and low-ionization lines are produced in low-velocity gas associated with the accretion disk or base of the wind. In this paper, we present the analysis of the spectra from these two objects; in a companion paper, we present photoionization analysis and a toy dynamical model for the wind. The highly asymmetric profile of C iv suggests that it is dominated by emission from the wind, so we develop a template for the wind from the C iv line. We model the bright emission lines in the spectra using a combination of this template and a narrow symmetric line centered at the rest wavelength. We also analyzed a comparison sample of Hubble Space Telescope spectra from 14 additional NLS1's and constructed a correlation matrix of emission-line and continuum properties. A number of strong correlations were observed, including several involving the asymmetry of the C iv line.

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“…Boller et al 1997a) or by changes of the cold and warm absorption column densities towards the source (e.g. Abrassart & Czerny 2000;Schartel et al 1997, Komossa & Meerschweinchen 2000.…”

Section: Introductionmentioning

confidence: 99%

RX J2217.9-5941: A highly X-ray variable Narrow-Line Seyfert1 galaxy

Grupe

Thomas

Leighly

2001

A&A

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Abstract. We report the discovery of a highly X-ray variable AGN, RX J2217.9-5941. This object was bright during the ROSAT All-Sky Survey (RASS), during which a decrease in the count rate by a factor of 12 was observed. It was found to be much fainter in follow-up HRI observations and is therefore an X-ray transient AGN candidate. On long time scales of years, its count rate decreased by a factor of about 30 between the RASS and the ROSAT HRI and ASCA observations in 1998. Analysis of the ASCA data, complicated by source confusion and poor statistics, tentatively indicates a steep spectrum in the faint state. There is no evidence for variability among 5 optical observations of the object obtained between 1992 and 1998. We discuss the variability of RX J2217.9-5941 and its possible X-ray transient nature.

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ROSAT monitoring of persistent giant and rapid variability in the narrow-line Seyfert 1 galaxy IRAS 13224-3809

Cited by 129 publications

References 42 publications

Constraining the Black Hole Mass and Accretion Rate in the Narrow‐Line Seyfert 1 Galaxy RE J1034+396

Constraining the Black Hole Mass and Accretion Rate in the Narrow‐Line Seyfert 1 Galaxy RE J1034+396

Hubble Space TelescopeSTIS Ultraviolet Spectral Evidence of Outflow in Extreme Narrow‐Line Seyfert 1 Galaxies. I. Data and Analysis

RX J2217.9-5941: A highly X-ray variable Narrow-Line Seyfert1 galaxy

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