[seminar] Astro Journal Club on February 7th (Wednesday, 3 p.m.)

[Lana Ceraj]

Dear all,

Astro Journal Club next Wednesday starts at 3 p.m. (sharp) in the seminar room F-201 of the Physics Department.

Presenter: Ivan Delvecchio, dr.sc.

Title: Cospatial Star Formation and Supermassive Black Hole Growth in z∼3 Galaxies: Evidence for In-situ Co-evolution

Authors: Rujopakarn et al. (2018)

Abstract: 
We present a sub-kpc localization of the sites of supermassive black hole (SMBH) growth in three active galactic nuclei (AGN) at z∼3 in relation to the regions of intense star formation in their hosts. These AGNs are selected from Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA) observations in the HUDF and COSMOS, with the centimetric radio emission tracing both star formation and AGN, and the sub/millimeter emission by dust tracing nearly pure star formation. We require radio emission to be ⩾5× more luminous than the level associated with the sub/millimeter star formation to ensure that the radio emission is AGN-dominated, thereby allowing localization of the AGN and star formation independently. In all three galaxies, the AGN are located within the compact regions of gas-rich, heavily obscured, intense nuclear star formation, with Re=0.4−1.1 kpc and average star formation rates of ≃100−1200 M⊙yr−1. If the current episode of star formation continues at such a rate over the stellar mass doubling time of their hosts, ≃0.2 Gyr, the newly formed stellar mass will be of the order of 1011 M⊙ within the central kpc region, concurrently and cospatially with significant growth of the SMBH. This is consistent with a picture of in-situ galactic bulge and SMBH formation. This work demonstrates the unique complementarity of VLA and ALMA observations to unambiguously pinpoint the locations of AGN and star formation down to ≃30 mas, corresponding to ≃230 pc at z=3. 

Link: https://arxiv.org/abs/1801.07072


If you’d like to present a paper from the field of astrophysics, please contact me via this email (lceraj at phy.hr).

You can find information about the upcoming AJC seminars and links to previous AJC presentations @ https://lanaceraj.wixsite.com/ajc-main 

See you all on Wednesday.

Cheers,
Lana
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