The XMM-Newton long look of NGC 1365: Measuring the size of the X-ray source

Granada - May 28, 2008

The XMM-Newton long look of NGC 1365:Measuring the size of the X-ray source

Guido RisalitiINAF - Arcetri Observatory, Italy

&Harvard-Smithsonian Center for Astrophysics

Collaborators:

M. Salvati, A. Baldi, S. Bianchi, V. Braito, M. Elvis, G. Fabbiano, M. Guainazzi, G. Matt, G. Miniutti, R. Soria, A. Zezas


NGC 1365: The best laboratory to investigate the structure of obscured AGN

Hard X-ray observations:

ASCA (1995) 40 ksBeppoSAX (1997) 30 ks Chandra (Dec 2002) 15 ksXMM 1 (Jan 2003) 17 ksXMM 2 (Jan 2003) 10 ksXMM 3 (Aug 2003) 15 ks XMM 4 (Jan 2004) 60 ksXMM 5 (Aug 2004) 60 ksChandra (Apr 06) 6x15 ks

XMM 6 (May 07) 4.5 daysSuzaku (Jan 08) 4 days


NGC 1365: Summary of past spectral variability


Chandra campaign: 6 observations (15 ks) in 10 days


Complete occultation in < 2 days

Dimensions of the X-ray source:D = V x T

If V ~ 104 km/s ----> D ~ 1014 cm

Black hole mass in NGC 1365:

Log MBH / Msun= 7.3 (0.3,0.3) from M-sigma corr (Ferrarese et al. 2005)

Log MBH / Msun= 7.86 (0.15,0.3) from M-LK corr (Marconi & Hunt 2003)

---> X-ray source within ~ 10 RG from the black hole---> X-ray C-thick absorber at ~ a few 1015 cm from the BH


XMM-Newton 60 ks observation: Compton-thin spectrum

Fe XXV and XXVI K and Kabs. lines(Risaliti et al. 2005)

Relativistic iron emission line(Risaliti et al. 2008, subm.)


NGC 1365: The best laboratory to investigate the structure of obscured AGN

• Several unique/extreme properties:

-Extreme absorption variability: complete eclipses in < two days --> X-ray source size, size and distance of the obscuring cloud- The highest S/N iron absorption lines detected so far --> high ionization, high column density warm absorber-Relativistic iron emission line: --> one of the most convincing cases

XMM & Suzaku long looks

Is NGC 1365 peculiar/unique among AGNs ?-Possible models-Observations of other “extreme” sources


NGC 1365: long XMM-Newton observation

Three consecutive orbits (~125 ks each, ~30 ks gap)May 30 - Jun 04, 2007


NGC 1365: long XMM observation


Constraints on the Cloud velocity

-Fe line width-Limits on U


Constraints on the Cloud velocity

Limits on the ionization parameter: U < 30

X-ray source: D < 2.6 1013 m72/5 (U/30)1/5 cm

Distance: R > 1.8 1015 m71/5 (U/30)-2/5 cm

Transverse velocity V < 8600 m72/5 (U/30)1/5 km/s

Limits on the Fe line width: =0.02 (<0.045) keV

X-ray source: D=6 1012 (<1013) cm


NGC 1365: uniqueness

Few bright sources with 1023 < NH < 1024 cm-2

Few other known cases of changing-look AGNs

Systematic analysis of XMM-Newton catalog tosearch for NH variations

within single observations

X-ray monitoring of changinglook sources: UGC 4203 with Chandra


A new Chandra monitoring Campaign of UGC 4203


The XMM Long look


The XMM Long look: diffuse emission


The XMM Long look: diffuse emission

Guainazzi et al. 2008, in prep.


The XMM Long look: the ULX

Soria et al. 2007, & 2008 in prep.


The XMM Long look: a serendipitous BL Lac

BLLac, Siemiginowska et al. in prep.


The XMM Long look

The XMM-Newton long look of NGC 1365: Measuring the size of the X-ray source

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