An informal meeting in the ESO Library. All are welcome.

Our next meeting will be on Thursday, 3 July 2014 at 11:15am.

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For questions, contact Mirko Krumpe (mkrumpe {at} or Grant Tremblay (gtrembla {at}

Next Meeting

Thursday, 3 July 2014 at 11:15am in the ESO library.

Aurora Simionescu (JAXA, Tokyo) will review the current status of Astro-H, the new Japanese X-ray telescope slated for launch in 2015, as well as discuss prospects for studying gas motions in clusters with this exciting upcoming mission.

Summary of Past Meetings

Meeting on Thursday, 15 May 2014

Li-Ting Hsu (MPE) spoke about his work on "CANDELS/GOODS-S, CDFS, ECDFS: Photometric Redshifts For X-Ray Detected AGNs And Normal Galaxies".

Meeting on Thursday, 24 April 2014

Dominika Wylezalek (ESO, soon-to-be Dr. Wylezalek at Johns Hopkins) spoke about her work on the CARLA project: "Clusters around radio-loud AGN".

Meeting on Thursday, 10 April 2014

Bernd Husemann (ESO) presented his work on "AGN host galaxies observed with integral field spectroscopy". Check out his latest paper here.

Meeting on Thursday, 27 March 2014

Mirko Krumpe (ESO) discussed his recent paper (and press release) on "RXTE Reveals the Cloudy Cores of Active Galaxies". Check out his paper here.

Meeting on Thursday, 16 January 2014

Maria Diaz Trigo (ESO) discussed her recent Nature paper on "Baryons in the relativistic jet of the stellar-mass black hole 4U 1630-47".

Meeting on Thursday, 5 December 2013

Jeremy Sanders (MPE) spoke about his very interesting recent result on the Coma cluster, which was published in Science. Check out his paper can be found here.

Meeting on Thursday, 21 November 2013

Alex Kolodzig (MPA) spoke about the unprecedented sample of 3 million AGN detected with the four-year X-ray all-sky survey of eROSITA (Launch 2015), complemented with redshift information, will supply us with outstanding opportunities for large-scale structure studies.

Meeting on Thursday, 31 October 2013

Johannes Buchner (MPE) discussed his work on obscuring AGN tori. He compared several obcurer models against X-ray data from the CDFS.

Meeting on Thursday, 26 September 2013

Robert Nikutta discussed "Active Galaxies in WISE colors", and showed a method by which one can predict the number of potentially observable type 2 AGN from an observed sample of unobscured type 1 objects.

Meeting on Thursday, 12 September 2013

Anna Feltre spoke about her soon-to-be defended PhD thesis, focused on reproduction of UV-to-IR SEDs of AGN using both smooth and clumpy torus models. One of Anna's recent papers can be found here.

Meeting on Thursday, 13 June 2013

Dominika Wylezalek spoke about her very interesting paper "Galaxy clusters around radio-loud AGN at 1.3 < z < 3.2", which you can find here.

Meeting on Thurs. 2 May 2013

Ski Antonnucci has published a very provocative comment in Nature, which you can find here. In addition, Volker Beckmann has published this short review on current open questions in the AGN field. During this meeting, we informally and broadly discussed both articles.

Special Workshop on Monday, 29 April 2013: AGN 101

On April 29th, 2013, Mirko, Grant, Paolo, and Vincenzo organized an AGN workshop for non-experts. 45 people attended the event. The four talk can be found here:
1) An overview of AGN - Paolo Padovani
2) Optical and Infra-red observation of AGNs: Why and what can we learn? - Vincenzo Mainieri
3) X-ray observations of AGNs: why and what can we learn? - Mirko Krumpe
4) Mechanical and Radiative Feedback from Active Galactic Nuclei - Grant Tremblay

Thurs. 18 April 2013

Leonard Burtscher (MPE) spoke about his work on "The MIDI AGN Large Programme: The largest sample of resolved AGN tori".

Thurs. 4 April 2013

Grant Tremblay reviewed some issues related to high-density kpc-scale environments surrounding AGN, particularly in the context of cooling flows and mechanical ("radio-mode") AGN feedback.

Thurs. 28 February 2013

Viola Allevato from MPP discussed her Ph.D. Thesis work on the occupation of X-ray selected AGN in the COSMOS field. Check out her paper here.

Thurs. 14 February 2013

Alex Kolodzig spoke about "AGN in the eROSITA All Sky Survey". The 4 year long eROSITA All Sky Survey (Launch 2014) will create an unprecedented sample of X-ray detected AGN. Alex presented the expected statistical properties of this sample. You can check out his associated paper here.

Thurs. 6 December 2012

David Rosario (MPE) discussed techniques for estimating star formation rates from observable quantities.

Thurs. 22 November 2012

David Rosario (MPE) discussed "Star Formation in Active Galaxies to z=2: A Herschel Perspective".

Thurs. 12 July 2012

Mark Sarzi discussed the possibility of nuclear star formation in the vicinity of AGN. One of Mark's papers on this topic can be found here.

Thurs. 31 June 2012

Mark Westmoquette led an interesting discussion of AGN-driven warm ionized gas outflows in ULIRGs, based on new results from his recent paper.

Thurs. 31 May 2012

Tim Davis discussed some new results on NGC 1266, which harbors a spectacular example of a multiphase AGN-driven outflow (including cold molecular gas). The ATLAS 3D team has published an initial paper on the object, which can be found here. Tim is currently writing a follow-up paper which will present some interesting new IFU results, which he shared at the meeting.

SPECIAL MEETING on Thurs. 10 May 2012

This unique meeting of the AGN Club focused on the basics of multiwavelength AGN sample selection, including radio, IR, optical, X-ray, and Gamma-ray.

The invited speakers leading this discussion are some of the world experts in their respective fields:
Paolo Padovani (ESO), Mara Salvato (MPE), Marcella Brusa (MPE), and Vincenzo Mainieri (ESO).

Together, Paolo, Mara, Marella, and Vincenzo led a fantastic discussion of: (a) how AGN samples are selected in various wavelength regimes, (b) the AGN parameter space sampled by these selection techniques, and (c) the observational biases associated with these methods.

You can find their talk HERE.

Figure by Paolo Padovani, Mara Salvato, Marcella Brusa, and Vincenzo Mainieri

Thurs. 19 April 2012

Takamitsu Miyaji gave an introduction to halo occupation distribution technique in the context of interpreting AGN clustering measurements. His paper can be found here.

Thurs. 5 April 2012

Mirko Krumpe gave an introduction to Compton thick AGN.

Thurs. 22 March 2012

Grant Tremblay gave an informal introductory talk on radio-mode AGN feedback models invoked at late epochs to quench cooling flow signatures in low-redshift "cool core" clusters of galaxies.

Thurs. 15 March 2012

Mirko Krumpe discussed some of the basics of AGN clustering measurements. Possible formats for future AGN club meetings were also dicussed.

Thurs. 23 Feb 2012

Joe Liske gave a nice introduction about the GAMA (Galaxy and Mass Assembly) survey. The GAMA spectroscopic survey of ~340,000 galaxies down to r~19.8 mag over 310 deg2 is carried out by using the AAOmega multi-object spectrograph on the Anglo-Australian Telescope. More information can be found at the official GAMA survey website.

Anna Feltre talked about her PhD thesis project. She studies AGN torus models which assume either a smooth or clumpy distribution of the dust in the torus, compares the prediction of both models with observational data, and searches for diagnostics that allow one to distinguish between the different models.

Thurs. 19 Jan 2012

Elaine Sadler joined us in some interesting discussions about current papers in preparation by various AGN club members. We also discussed some work which Elaine is currently involved in.

Thurs. 17 Nov 2011

Nico Cappelluti lead an excellent dicussion based on his XMM-COSMOS work.

Thurs. 3 Nov 2011

Mara Salvato discussed her work on compiling reliable photometric redshift catalogs for AGN in the XMM-COSMOS and Chandra-COSMOS subsets of the COSMOS Survey. Her talk can be found here. (need file)

Montse Villar-Martin discussed her work on ionised outflows from type 2 quasars, as well as the role of mergers in triggering quasar activity. Her talk can be found here (ppt format).

Thurs. 6 Oct 2011

Antonis Georgakakis spoke about AGN number density in the context of merger-driven vs. secular evolution, star formation. etc. This kicked off a great, wide-ranging discussion on the cosmological evolution of star formation and AGN activity, and the degree to which their relationship is mediated by the infall of gas (via mergers, cooling flows, etc.).

Finally, this amazing paper by Jahnke Knud was mentioned. The authors start with an uncorrelated distribution of BH masses and stellar velocity dispersions, combine their points along standard LCDM merger trees with no additional physics, and are able to effectively reproduce the M_BH-sigma relation. Check out their pretty stunning (and slightly terrifying) figures, one of which is below.

Thurs. 22 Sept 2011

1. Alvaro Iribarrem shared some results from his work on the redshift dependence of FIR colors .... (will finish this soon)

2. Paolo Padovani briefly reviewed his large portfolio of work, (which of course we're very familiar with!). Recently, Paolo published this very important paper on a complete radio sample of sub-mJy sources in the CDF South. Their results suggest that star formation makes the dominant contribution to radio emission in radio quiet AGN. The radio loud / radio quiet ``dichotomy'' (if you can call it that) has been a critically important question for ~30 years. This paper is a must-read.

3. The incredibly useful COSMOS Survey was discussed. ASURV, a survival analysis code, was also briefly mentioned.

Last updated November 2012
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