5-9th September 2011 SED2011 conference

A new model for the infrared emission of IRAS F10214+4724

Andreas Efstathiou

European University Cyprus

5-9th September 2011 SED2011 conference

Introduction to IRAS F10214+4724

• Discovered by Rowan-Robinson et al (1991)• Gravitationally lensed by a factor of 10 - 100• Similar to Seyfert 2 galaxies in optical-UV• Large quantity of molecular gas and bright in the

submillimeter• Similar to local ULIRGs?

5-9th September 2011 SED2011 conference

Starburst model of Efstathiou, Rowan-Robinson & Siebenmorgen (2000)

• Stellar population synthesis model of Bruzual & Charlot

• Radiative transfer that includes effect of small grains/PAHs (Siebenmorgen & Krugel)

• Simple model for the evolution of giant molecular clouds

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

Fit to Arp220 with the Efstathiou et al model (Farrah et al 2003)

5-9th September 2011 SED2011 conference

00183-7111 – A young starburst?

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

Mid-IR spectroscopy of AGN

• 8-13m spectrophotometry from the ground by Roche and collaborators

• Type 2 AGN showed moderate silicate absorption features

• Type 1 AGN featureless• Discovery of silicate emission features in the

Spitzer spectra of quasars by Siebenmorgen et al and Hao et al.

5-9th September 2011 SED2011 conference

Average spectra of Hao et al

5-9th September 2011 SED2011 conference

Tapered disc of Efstathiou & Rowan-Robinson (1995)

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

5-9th September 2011 SED2011 conference

Tapered disc model of NGC1068 (Galliano et al 2003)

Grid of tapered disc models

• Computed a grid of 36 tapered disc models

• Vary outer to inner disc radius in the range 20 to 100

• Vary equatorial 1000A optical depth in the range 750 to 1250

• Vary torus opening angle in the range 30-60degrees

• Compute spectra for 74 inclinations5-9th September 2011 SED2011 conference

Distribution of silicate strength of tapered disc models (blue) – AGN of

Spoon et al shown in red

5-9th September 2011 SED2011 conference

As previous slide but including all galaxies of Spoon et al with EW < 0.07

5-9th September 2011 SED2011 conference

Distribution of silicate strength of all tapered disc models + NLR dust with a

covering factor of 5%

5-9th September 2011 SED2011 conference

Fit to the Hao et al Seyfert 2 average with a tapered disc and NLR dust

5-9th September 2011 SED2011 conference

Phoenix

• A new code that calculates the ultraviolet to mm emission of galaxies

• Incorporates the stellar population synthesis model of Bruzual & Charlot

• Incorporates the starburst model of Efstathiou, Rowan-Robinson & Siebenmorgen

• Treats multiple scattering from grains

5-9th September 2011 SED2011 conference

Results from Phoenix

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Fit to the SED of a spiral galaxy

5-9th September 2011 SED2011 conference

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Model of Efstathiou (2006)

• The model assumes four components

• A torus viewed edge-on• Dust at a temperature of

600K and a covering factor of 2%

• Dust at a temperature of 200K and a covering factor of 15%

• A highly obscured starburst

5-9th September 2011 SED2011 conference

New model of F10214 that fits Herschel data

• The model assumes an additional component of NLR dust at a temperature of 80K

• The covering factor of NLR dust is very high. It is very likely that we have stronger gravitational lensing of the NLR than the torus

5-9th September 2011 SED2011 conference

Conclusions

• We have a fairly good understanding of the infrared emission of starburst galaxies and AGN

• IRAS F10214+4724 is very special. Its unique spectrum is probably due to the gravitational lensing of the emission of NLR clouds.

5-9th September 2011 SED2011 conference