The Onset of Thermally Unstable Cooling from the Hot Atmospheres of Giant Galaxies in Clusters: Constraints on Feedback Models by Hogan, M. T., McNamara, B. R., Pulido, F. A., Nulsen, P. E. J., Vantyghem, A. N., Russell, H. R., Edge, A. C., Babyk, Iu., Main, R. A., McDonald, Michael A.

“…We find that the inner cooling times of cluster atmospheres are resilient to active galactic nucleus (AGN)-driven change, suggesting gentle coupling between radio jets and atmospheric gas. …”
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Anatomy of a Cooling Flow: The Feedback Response to Pure Cooling in the Core of the Phoenix Cluster by McDonald, M., McNamara, B. R., Voit, G. M., Bayliss, Matthew B, Benson, B. A., Brodwin, M., Canning, R. E. A., Florian, M. K., Garmire, G. P., Gaspari, M., Gladders, M. D., Hlavacek-Larrondo, J., Kara, Erin A, Reichardt, C. L., Russell, H. R., Saro, A., Sharon, K., Somboonpanyakul, T., Tremblay, G. R., Weeren, R. J. van

“…These data support a picture in which active galactic nucleus feedback is promoting the formation of a multiphase medium via uplift of low-entropy gas, either via ordered or chaotic (turbulent) motions.…”
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Ejective and preventative: the IllustrisTNG black hole feedback and its effects on the thermodynamics of the gas within and around galaxies by Zinger, Elad, Pillepich, Annalisa, Nelson, Dylan, Weinberger, Rainer, Pakmor, Rüdiger, Springel, Volker, Hernquist, Lars, Marinacci, Federico, Vogelsberger, Mark

“…In practice, the same active galactic nucleus (AGN) feedback channel is simultaneously ‘ejective’ and ‘preventative’ and leaves an imprint on the temperature, density, entropy, and cooling times also in the outer reaches of the gas halo, up to distances of several hundred kiloparsecs. …”
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Very Large Array observations of the mini-halo and AGN feedback in the Phoenix cluster by Timmerman, R, van Weeren, RJ, McDonald, M, Ignesti, A, McNamara, BR, Hlavacek-Larrondo, J, Röttgering, HJA

“…Strong star formation in the brightest cluster galaxy indicates that active galactic nucleus (AGN) feedback has been unable to inhibit this cooling flow. …”
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Submillimetre galaxies in cosmological hydrodynamical simulations – an opportunity for constraining feedback models by Hayward, Christopher C, Sparre, Martin, Chapman, Scott C, Hernquist, Lars, Nelson, Dylan, Pakmor, Rüdiger, Pillepich, Annalisa, Springel, Volker, Torrey, Paul, Vogelsberger, Mark, Weinberger, Rainer

“…We demonstrate that IllustrisTNG hosts fewer SMGs than Illustris because in the former, high-mass ($M_{\star }\sim 10^{11} \, \text{M}_{\odot }$) z ∼ 2–3 galaxies have lower dust masses and SFRs than in Illustris owing to differences in the subgrid models for stellar and/or active galactic nucleus feedback between the two simulations (we unfortunately cannot isolate the specific cause(s) post hoc). …”
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AGN and star formation at cosmic noon: comparison of data to theoretical models by Florez, Jonathan, Jogee, Shardha, Guo, Yuchen, Cora, Sofía A, Weinberger, Rainer, Davé, Romeel, Hernquist, Lars, Vogelsberger, Mark, Ciardullo, Robin, Finkelstein, Steven L, Gronwall, Caryl, Kawinwanichakij, Lalitwadee, Leung, Gene CK, LaMassa, Stephanie, Papovich, Casey, Stevans, Matthew L, Wold, Isak

“…In theoretical models of galaxy evolution, active galactic nucleus (AGN) and star formation (SF) activity are closely linked and AGN feedback is routinely invoked to regulate galaxy growth. …”
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A Substantial Mass of Cool, Metal-enriched Gas Surrounding the Progenitors of Modern-day Ellipticals by Prochaska, J. Xavier, Hennawi, Joseph F., Simcoe, Robert A.

“…This unexpected reservoir of cool gas is rarely detected "down-the-barrel" to quasars, and hence it is likely that our background sight lines intercept gas that is shadowed from the quasar ionizing radiation by the same obscuring medium often invoked in models of active galactic nucleus unification. Because the high-z halos inhabited by quasars predate modern groups and clusters, these observations are also relevant to the formation and enrichment history of the intragroup/intracluster medium.…”
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THE ERA OF STAR FORMATION IN GALAXY CLUSTERS by Brodwin, M., Stanford, S. A., Gonzalez, Anthony H., Zeimann, G. R., Snyder, G. F., Mancone, C. L., Pope, A., Eisenhardt, P. R., Stern, D., Alberts, S., Ashby, M. L. N., Brown, M. J. I., Chary, R.-R., Dey, A., Galametz, A., Gettings, D. P., Jannuzi, Buell T., Moustakas, J., Moustakas, L. A., Miller, Eric D

“…By combining these observations with complementary studies showing a rapid increase in the active galactic nucleus (AGN) fraction, a stochastic star formation history, and a major merging episode at the same epoch in this cluster sample, we suggest that the starburst activity is likely merger-driven and that the subsequent quenching is due to feedback from merger-fueled AGNs. …”
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AN HST/COS OBSERVATION OF BROAD Lyα EMISSION AND ASSOCIATED ABSORPTION LINES OF THE BL LACERTAE OBJECT H 2356-309 by Danforth, Charles W., Buote, David A., Stocke, John T., Shull, J. Michael, Canizares, Claude R., Gastaldello, Fabio, Fang, Taotao, 1970-

“…Weak spectral features in BL Lacertae objects (BL Lacs) often provide a unique opportunity to probe the inner region of this rare type of active galactic nucleus. We present a Hubble Space Telescope/Cosmic Origins Spectrograph observation of the BL Lac H 2356-309. …”
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FINDING FOSSIL GROUPS: OPTICAL IDENTIFICATION AND X-RAY CONFIRMATION by Rykoff, Eli S., Dupke, Renato A., Mendes de Oliveira, Claudia, Lopes de Oliveira, Raimundo, Proctor, Robert N., Garmire, Gordon P., Koester, Benjamin P., McKay, Timothy A., Miller, Eric D

“…A small number of detected FGs are morphologically irregular, possibly due to past mergers, interaction of the intra-group medium with a central active galactic nucleus (AGN), or superposition of multiple massive halos. …”
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MARKARIAN 6: SHOCKING THE ENVIRONMENT OF AN INTERMEDIATE SEYFERT by Mingo, B., Hardcastle, M. J., Croston, J. H., Hota, A., Kharb, Preeti, Kraft, Ralph P., Evans, Daniel A.

“…We also look for evidence of a variable absorbing column along our line of sight to Mrk 6, to explain the evident differences seen in the active galactic nucleus (AGN) spectra from the various, non-contemporaneous, observations. …”
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HOT GASEOUS CORONAE AROUND SPIRAL GALAXIES: PROBING THE ILLUSTRIS SIMULATION by Vogelsberger, Mark, Kraft, Ralph P., Hernquist, Lars, Gilfanov, Marat, Churazov, Eugene, Genel, Shy, Forman, William R., Murray, Stephen S., Vikhlinin, Alexey, Jones, Christine, Böhringer, Hans, Bogdan, Akos, Torrey, Paul A.

“…However, one shortcoming of Illustris is that massive black holes, mostly residing in giant ellipticals, give rise to powerful radio-mode active galactic nucleus feedback, which results in under-luminous coronae for ellipticals.…”
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NUMERICAL SIMULATION OF HOT ACCRETION FLOWS. III. REVISITING WIND PROPERTIES USING THE TRAJECTORY APPROACH by Yuan, Feng, Gan, Zhaoming, Narayan, Ramesh, Bu, Defu, Bai, Xue-Ning, Sadowski, Aleksander B

“…Finally, we find that the wind production efficiency ε[subscript wind ≡ [. over E][subscript wind]/[. over M][subscript BH]c[superscript 2] ~ 1/1000 is in good agreement with the value required from large-scale galaxy simulations with active galactic nucleus feedback.…”
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Physical conditions of the interstellar medium of high-redshift, strongly lensed submillimetre galaxies from the Herschel-ATLAS by Valtchanov, I, Virdee, J, Ivison, R, Swinyard, B, van der Werf, P, Rigopoulou, D, da Cunha, E, Lupu, R, Benford, D, Riechers, D, Smail, I, Jarvis, M, Pearson, C, Gomez, H, Hopwood, R, Altieri, B, Birkinshaw, M, Coia, D, Conversi, L, Cooray, A, De Zotti, G, Dunne, L, Frayer, D, Leeuw, L, Marston, A

“…The radio observations indicate that SDP.81 deviates significantly from the local far-infrared/radio (FIR/radio) correlation, which hints that some fraction of the radio emission is coming from an active galactic nucleus (AGN). The constraints on the source size from millimetre-wave observations put a very conservative upper limit of the possible AGN contribution to less than 33 per cent. …”

HERSCHEL-PACS OBSERVATIONS OF FAR-IR CO LINE EMISSION IN NGC 1068: HIGHLY EXCITED MOLECULAR GAS IN THE CIRCUMNUCLEAR DISK by Hailey-Dunsheath, S, Sturm, E, Fischer, J, Sternberg, A, Gracia-Carpio, J, Davies, R, Gonzalez-Alfonso, E, Mark, D, Poglitsch, A, Contursi, A, Genzel, R, Lutz, D, Tacconi, L, Veilleux, S, Verma, A, de Jong, J

“…The blueshift of the HE lines may also be consistent with the bluest regions of this H2 ring, but a better kinematic match is found with a clump of infalling gas 40pc north of the active galactic nucleus (AGN). We consider potential heating mechanisms and conclude that X-ray- or shock heating of both components is viable, while far-UV heating is unlikely. …”

The star formation rates of QSOs by Symeonidis, M, Maddox, N, Jarvis, MJ, Michalowski, MJ, Andreani, P, Clements, DL, De Zotti, G, Duivenvoorden, S, Gonzalez-Nuevo, J, Ibar, E, Ivison, RJ, Leeuw, L, Page, MJ, Shirley, R, Smith, MWL, Vaccari, M

“…By normalizing an intrinsic active galactic nucleus (AGN) template to the AGN optical power (at 5100 &Aring;), we decompose the total IR emission (<em>L</em>_IR; 8&ndash;1000 &micro;m) into an AGN (<em>L</em>_{IR, AGN}) and star-forming component (<em>L</em>_{IR, SF}). …”

The detailed nature of active central cluster galaxies by Loubser, S, Soechting, I

“…This also indicates that the derived nebular properties are spatially homogeneous. We fit active galactic nucleus (AGN) and post-asymptotic giant branch (pAGB) stars photoionization models as well as shock excitation models to our derived diagnostic ratios. …”

Galaxy Zoo: Dust and molecular gas in early-type galaxies with prominent dust lanes by Kaviraj, S, Ting, Y, Bureau, M, Shabala, S, Crockett, R, Silk, J, Lintott, C, Smith, A, Keel, W, Masters, K, Schawinski, K, Bamford, S

“…Compared to their control-sample counterparts, D-ETGs exhibit bluer ultraviolet-optical colours (indicating enhanced levels of star formation) and an active galactic nucleus fraction that is more than an order of magnitude greater (indicating a strikingly higher incidence of nuclear activity). …”

Spatially resolved cold molecular outflows in ULIRGs by Pereira-Santaella, M, Colina, L, Garcia-Burillo, S, Combes, F, Emonts, B, Aalto, S, Alonso-Herrero, A, Arribas, S, Henkel, C, Labiano, A, Muller, S, Lopez, J, Rigopoulou, D, Werf, P

“…The origin of these outflows can be explained by the strong nuclear starbursts although the contribution of an obscured active galactic nucleus cannot be completely ruled out. The position angle (PA) of the outflowing gas along the kinematic minor axis of the nuclear molecular disk suggests that the outflow axis is perpendicular to the disk for three of these outflows. …”

A HIGH SPATIAL RESOLUTION MID-INFRARED SPECTROSCOPIC STUDY OF THE NUCLEI AND STAR-FORMING REGIONS IN LUMINOUS INFRARED GALAXIES by Diaz-Santos, T, Alonso-Herrero, A, Colina, L, Packham, C, Levenson, N, Pereira-Santaella, M, Roche, P, Telesco, C

“…We investigate the spatial variations of the features seen in the N-band spectra of LIRGs on scales of ∼100pc, which allow us to resolve their nuclear regions and separate the active galactic nucleus (AGN) emission from that of the star formation (SF). …”