Theresa Falkendal
Massive galaxies on the road to quenching: ALMA observations of powerful high redshift radio galaxies
Falkendal, Theresa; De Breuck, Carlos; Lehnert, Matthew D.; Drouart, Guillaume; Vernet, Joël; Emonts, Bjorn; Lee, Minju; Nesvadba, Nicole P.H.; Seymour, Nick; Béthermin, Matthieu; Kolwa, Sthabile; Gullberg, Bitten; Wylezalek, Dominika
Authors
Carlos De Breuck
Matthew D. Lehnert
Guillaume Drouart
Joël Vernet
Bjorn Emonts
Minju Lee
Nicole P.H. Nesvadba
Nick Seymour
Matthieu Béthermin
Sthabile Kolwa
Bitten Gullberg
Dominika Wylezalek
Abstract
We present 0.″3 (band 6) and 1.″5 (band 3) ALMA observations of the (sub)millimeter dust continuum emission for 25 radio galaxies at 1 < z < 5.2. Our survey reaches a rms flux density of ∼50 μJy in band 6 (200–250 GHz) and ∼20 μJy in band 3 (100–130 GHz). This is an order of magnitude deeper than single-dish 850 μm observations, and reaches fluxes where synchrotron and thermal dust emission are expected to be of the same order of magnitude. Combining our sensitive ALMA observations with low-resolution radio data from ATCA, higher resolution VLA data, and infrared photometry from Herschel and Spitzer, we have disentangled the synchrotron and thermal dust emission. We determine the star-formation rates and AGN infrared luminosities using our newly developed Multi-resolution and multi-object/origin spectral energy distribution fitting code (MR-MOOSE). We find that synchrotron emission contributes substantially at λ ∼ 1 mm. Through our sensitive flux limits and accounting for a contribution from synchrotron emission in the mm, we revise downward the median star-formation rate by a factor of seven compared to previous estimates based solely on Herschel and Spitzer data. The hosts of these radio-loud AGN appear predominantly below the main sequence of star-forming galaxies, indicating that the star formation in many of the host galaxies has been quenched. Future growth of the host galaxies without substantial black hole mass growth will be needed to bring these objects on the local relation between the supermassive black holes and their host galaxies. Given the mismatch in the timescales of any star formation that took place in the host galaxies and lifetime of the AGN, we hypothesize that a key role is played by star formation in depleting the gas before the action of the powerful radio jets quickly drives out the remaining gas. This positive feedback loop of efficient star formation rapidly consuming the gas coupled to the action of the radio jets in removing the residual gas is how massive galaxies are rapidly quenched.
Citation
Falkendal, T., De Breuck, C., Lehnert, M. D., Drouart, G., Vernet, J., Emonts, B., …Wylezalek, D. (2019). Massive galaxies on the road to quenching: ALMA observations of powerful high redshift radio galaxies. Astronomy & Astrophysics, 621, Article A27. https://doi.org/10.1051/0004-6361/201732485
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 10, 2018 |
Online Publication Date | Jan 3, 2019 |
Publication Date | Jan 3, 2019 |
Deposit Date | Jan 17, 2019 |
Publicly Available Date | Jan 17, 2019 |
Journal | Astronomy and astrophysics. |
Print ISSN | 0004-6361 |
Electronic ISSN | 1432-0746 |
Publisher | EDP Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 621 |
Article Number | A27 |
DOI | https://doi.org/10.1051/0004-6361/201732485 |
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Copyright Statement
© ESO 2019. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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