Jets tidal disruption and lenses
Download
1 / 47

Jets, tidal disruption and lenses - PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on

Jets, tidal disruption and lenses. Plan and reviews. Plan. Jets : AGNs and close binary systems Tidal distruption of stars by SMBHs Spectral lines and lensing. Reviews. astro-ph/0611521 High-Energy Aspects of Astrophysical Jets astro-ph/0306429 Extreme blazars

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Jets, tidal disruption and lenses' - nixie


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Plan and reviews
Plan and reviews

Plan

  • Jets: AGNsand close binary systems

  • Tidal distruption of stars by SMBHs

  • Spectral lines and lensing

Reviews

  • astro-ph/0611521High-Energy Aspects of Astrophysical Jets

  • astro-ph/0306429 Extreme blazars

  • astro-ph/0312545AGN Unification: An Update

  • astro-ph/0212065 Fluorescent iron lines as a probe of

  • astrophysical black hole systems

  • arXiv: 1104.0006 AGN jets

  • astro-ph/0406319 Astrophysical Jets and Outflows


Jets in agns and close binaries
Jets in AGNs and close binaries

AGN: MBH=108-109 M0

L<~LEdd~1042-1047 erg/s

< few Mpc

Г~5-50

Δt~hours-years

CBS: MBH~10 M0

L<~LEdd~1037-1040 erg/s

~pc

Г~1-10

Δt~days

(see astro-ph/0611521)



Close by and far away jets
Close-by and far-away jets

1% of SMBH are active. 10% out of them launch relativistic jets.

Jets are not magnetically dominated.

GB1508+5714 z=4.30

3C273

See a review in 1104.0006


Classification of agn radio jets
Classification of AGN radio jets

FR I. Two-sided jets.

Jets dominate in the emission.

Usually are found in rich clusters.

FR II.One-sided jets.

Radio lobes dominate over jets.

Mostly isolated galaxies or poor groups.

astro-ph/0406319

See a review on radio galaxies in arXiv: 1101.0837


X ray and radio properties
X-ray and radio properties

Low-Excitation Galaxies

1003.0976

1104.3575


X ray jets
X-ray jets

Quasars atz: 0.6-1.5

X-ray energy rangefrom 0.5 to 7 keV.

Energy distribution for different parts of jets.

Equipartition andcondition for IC of CMB.

(astro-ph/0306317)


X-ray emission from “knots” is due to IC of relict photons on the same e-

which produce radio synchrotron.

δ=(Γ(1-βcosθ)) -1


Magnetic field in a jet
Magnetic field in a jet photons on the same e

Observations of M87 tell us that the magnetic field in the jet is mostly parallel to the jet axis, but inthe emission regions (“knots”) it becomes perpendicular (see astro-ph/0406319).

The same structure is observed in several jetswith radio lobes.


Blobs in jets
Blobs in jets photons on the same e

It is believed that bright featuresin AGN jets can be results of theKelvin-Helmholtz instability.This instability leads to a spiralstructure formation in a jet.

(see, for example,astro-ph/0103379).

3C 120

However, in the case of 3C 120 the blobs appearence is due toprocesses in the disc. Dips in X-rays (related to the disc) appear before blobs ejection (Marscher et al. 2002).

(Marscher, A.P., et al., NATURE Vol 417 p. 625)


Blazars
Blazars photons on the same e

If a jet is pointing towards us,then we see a blazar.

A review on blazar jets 1010.2856


Blazars at very high energies
Blazars at very high energies photons on the same e

Blazars are powerful gamma-ray sources. The most powerful of them haveequivalent isotropic luminosity 1049erg/s.

Collimationθ2/2 ~ 10-2 – 10-3. θ – jet opening angle.

EGRETdetected 66 (+27) sources of this type.New breakthrough is expected after the launch ofGLAST.

Several sources have been detected in the TeV range by ground-basedgamma-ray telescopes. All of them, except M87, are BL Lacs at z<0.2

(more precisely, to high-frequency-peaked BL Lac – HBL).

Observations show that often (but not always)after a gamma-ray bursts few weeks or monthslater a burst happens also in the radio band.

(seeastro-ph/0611521)

GLAST aka Fermi


Microquasars
Microquasars photons on the same e

The correlation between X-ray andsynchrotron (i.e. between disc andjet emission) is observed.

GRS 1915


Microquasars jets in radio
Microquasars jets in radio photons on the same e

LS 5039/RX J1826.2-1450 –is a galactic massive X-ray binary.

The jet length is ~1000 а.е.

Probably, the source wasobserved by EGRET as3EG J1824-1514.

(Many examples of VLBI radio jets from different sources can be found at the web-sitehttp://www.evlbi.org/gallery/images.html)


The role of a donor
The role of a donor photons on the same e

An important difference between the microquasars case and AGNs is relatedto the existence of a donor-star. Especially, if it is a giant, then the star can inject matter and photons into the jet.

(seeParedes astro-ph/0412057)


Microquasars in gamma rays tev range
Microquasars in gamma-rays: TeV range photons on the same e

F. Aharonian et al.


Tev emission from cyg x 1
TeV emission from photons on the same eCyg X-1

arxiv:0706.1505


Jet models
Jet models photons on the same e

In all models jets are related to discs.Velocity at the base of a jet is about theparabolic (escape) velocity.

(the table is fromastro-ph/0611521)


Jet power
Jet power photons on the same e

Pjet>2Pr~2L/Γ2

1104.0006


Jet and disc
Jet and disc photons on the same e

Ld – disc luminosity.

Pjet=PB+PP+Pe

In the gray stripes Pjet ~ Mdot and

at low accretion rates Ld ~ Mdot2, at large - Ld ~ Mdot.

1104.0006


Displaced smbh in m87
Displaced SMBH in M87 photons on the same e

Projected displacement of 6.8+/-0.8 pc

consistent with the jet axis

displaced in the counter-jet direction

Other explanations are possible

1005.2173


Different accretion regimes in agns
Different accretion regimes in AGNs photons on the same e

Anticorrelation forlow-luminosity AGNs(LINERS).

Correlation for luminous AGNs.

In the critical point the accretion regime can be changed:

from a standard thin accretion discto RIAF (radiatively inefficient accretion flow).

1104.4891


Bh mass determination
BH mass determination photons on the same e

Accretion disc contribution is visible in opt-UV.It allows to estimate the BH mass.

It can be compared with emission lines estimates.

Bars correspond to different lines used.

1104.0006


Tidal disruption
Tidal disruption photons on the same e

The Hills limit: 3 108solar masses. A BH disrupts stars.

After a disruption in

happens a burst with the temperature

The maximum accretion rate

This rate corresponds to the moment

Then the rate can be described as

For a BH with M<107 M0 the luminosity at maximum is:

(astro-ph/0402497)


A burst in ngc 5905
A burst in photons on the same eNGC 5905

The decay was well described by the relation:

Two other bursts discovered by ROSATand observed by

HST and Chandra:

RX J1624.9+7554

RX J1242.6-1119A

(astro-ph/0402497)


The burst rx j1242 6 1119a
The burst photons on the same eRX J1242.6-1119A

X-ray luminosityat maximum:

~1044erg/s

The spectrum wasobtained by XMMin 2001, ie. nearly9 years afterthe burst.

The luminosity was 4.5 1041erg/s,i.e.~200 timessmaller.

(astro-ph/0402468)


High energy transient swift j164449 3 573451
High-energy transient Swift J164449.3+573451 photons on the same e

1104.3257

1104.3356

Also known as GRB 110328A


A unique event
A unique event photons on the same e

z=0.35

The transient does not looks similar to GRBs, SN or any other type of event

1104.3356


A tidal disruption event
A tidal disruption event photons on the same e

Light curve fits the predictionfor a tidal event.

The spectrum is blazar-like.

1104.4787


Optical observations of tidal disruptions
Optical observations of tidal disruptions photons on the same e

In optics one can observe events far from the horizon.

Future surveys (likePan-STARRS)can discover 20-30 events per year.

arxiv:0904.1596


Ptf10iya a short lived luminous flare
PTF10iya: A short-lived, luminous flare photons on the same e

Blackbody with T ≈ 1–2 × 104 K,

R ≈ 200AU, and

L ≈ 1044–1045 erg s−1.

Previously – no activity(i.e., not an AGN).

Found by Palomar Transient Factory

Star-forming galaxy at z=0.22

Can be a solar-type star destroyed by a 107 solar mass BH.

An X-ray transient detected by Swift

1103.0779


Two more examples of optical flares due to tidal disruption events
Two more examples of optical flares photons on the same edue to tidal disruption events

SDSS data

Atypical flares

Rate estimates:

~10-5 per year per galaxy

or slightly more

Dashed lines: -5/3Solid lines: -5/9

1009.1627


Theoretical models
Theoretical models photons on the same e

  • X-rays. 1105.2060

  • Radio. 1104.4105

1104.2528


Squeezars
Squeezars photons on the same e

The rate offormation is lowerthan the rate oftidal disruptionevents, but the observable timeis longer.

Graphs are plottedfor a solar-typestar orbitingthe BH in thecenter of our Galaxy.

(astro-ph/0305061)


Структура диска вокруг сверхмассивной черной дыры

Наблюдение микролинзирования позволяетвыявлять структуру аккреционного диска.

Кроме этого, наблюдалась линзированнаялиния железа. Удалось «увидеть» корону диска.

1204.4480


Disc structure from microlensing
Disc structure from microlensing сверхмассивной черной дыры

Using the data on microlensingat wavelengths 0.4-8 micronsit was possible to derive the sizeof the disc in the quasar HE1104-1805 at different wavelengths.

arXiv:0707.0003Shawn Poindexteret al. «The Spatial Structure of An Accretion Disk»


Discs observed by vlti
Discs observed by сверхмассивной черной дырыVLTI

The structure of the disc in Cen Awas studied in IR for scales <1 pc.

The data is consistent with ageometrically thin discwith diameter 0.6 pc.

Observations on VLTI.

arXiv:0707.0177K. Meisenheimer et al.

«Resolving the innermost parsec of Centaurus A at mid-infrared wavelengths»


Discs around black holes a look from aside
Discs around black holes сверхмассивной черной дыры:a look from aside

Disc temperature

Discs observed from infinity.

Left: non-rotating BH,

Right: rotating.

http://web.pd.astro.it/calvani/


(from gr-qc/0506078) сверхмассивной черной дыры


Different effects
Different effects сверхмассивной черной дыры

For maximal rotation rISCO=r+

  • Doppler effect

  • Relativistic beaming

  • GR light bending

  • GR grav. redshift

arXiv: 0907.3602


Fluorescent lines
Fluorescent lines сверхмассивной черной дыры

The Кαiron line observed byASCA (1994 г.).

Seyfert galaxyMCG-6-30-15

Dashed line: the model with

non-rotating BH,disc inclination 30 degrees.

(astro-ph/0212065)


Lines and rotation of bhs
Lines and rotation of BHs сверхмассивной черной дыры

XMM-Newton data

(astro-ph/0206095)

The fact that the lineextends to the red sidebelow 4 keV is interpreted as the signof rapid rotation(the disc extends inside 3Rg).

(seeastro-ph/0212065)


Suzaku spin measurements program
Suzaku spin measurements program сверхмассивной черной дыры

NGC 3783 z = 0.00973

A very complicated model.

a > 0.93 (90% confidence)

1104.1172


The inner edge
The inner edge сверхмассивной черной дыры

The place where the fluorescent line is formed is not necessarily the standard ISCO.

Especially for large accretion ratesthe situation is complicated.

1003.3887


Measuring spins of stellar mass bhs
Measuring spins of stellar-mass BHs сверхмассивной черной дыры

Different methods used

1101.0811


Twisted light
Twisted light сверхмассивной черной дыры

If the source of the gravitational field also rotates, it drags space-time with it.

Because of the rotation of the central

mass, each photon of a light beam propagating along a null geodesic will experience a well-defined phase variation.

This effect can be usedto learn about spinof accreting BHs.

1104.3099

See http://www.physics.gla.ac.uk/Optics/play/photonOAM/

and astro-ph/0307430 about orbital angular momentum of photons


ad