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Decoupled black hole accretion and quenching : the relationship between BHAR, SFR and quenching in Milky Way- and Andromeda-mass progenitors since z=2.5

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Abstract
We investigate the relationship between the black hole accretion rate (BHAR) and star formation rate (SFR) for Milky Way (MW) and Andromeda (M31)-mass progenitors from z = 0.2 to 2.5. We source galaxies from the K-s-band-selected ZFOURGE survey, which includes multiwavelength data spanning 0.3-160 mu m. We use decomposition software to split the observed spectral energy distributions (SEDs) of our galaxies into their active galactic nuclei (AGNs) and star-forming components, which allows us to estimate BHARs and SFRs from the infrared (IR). We perform tests to check the robustness of these estimates, including a comparison with BHARs and SFRs derived from X-ray stacking and far-IR analysis, respectively. We find that, as the progenitors evolve their relative black hole-galaxy growth (i.e. their BHAR/SFR ratio) increases from low to high redshift. The MW-mass progenitors exhibit a log-log slope of 0.64 +/- 0.11, while the M31-mass progenitors are 0.39 +/- 0.08. This result contrasts with previous studies that find an almost flat slope when adopting X-ray-/AGN-selected or mass-limited samples and is likely due to their use of a broad mixture of galaxies with different evolutionary histories. Our use of progenitor-matched samples highlights the potential importance of carefully selecting progenitors when searching for evolutionary relationships between BHAR/SFRs. Additionally, our finding that BHAR/SFR ratios do not track the rate at which progenitors quench casts doubts over the idea that the suppression of star formation is predominantly driven by luminous AGN feedback (i.e. high BHARs).
Keywords
ACTIVE GALACTIC NUCLEI, STAR-FORMING GALAXIES, DEEP FIELD-SOUTH, HOST, GALAXIES, HIGH-REDSHIFT, EVOLUTION, QUASARS, AGN, CATALOG, STELLAR, galaxies: active, galaxies: evolution, galaxies: high-redshift, infrared: galaxies

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MLA
Cowley, MJ, LR Spitler, RF Quadri, et al. “Decoupled Black Hole Accretion and Quenching : the Relationship Between BHAR, SFR and Quenching in Milky Way- and Andromeda-mass Progenitors Since Z=2.5.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 473.3 (2018): 3710–3716. Print.
APA
Cowley, M., Spitler, L., Quadri, R., Goulding, A., Papovich, C., Tran, K., Labbe, I., et al. (2018). Decoupled black hole accretion and quenching : the relationship between BHAR, SFR and quenching in Milky Way- and Andromeda-mass progenitors since z=2.5. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 473(3), 3710–3716.
Chicago author-date
Cowley, MJ, LR Spitler, RF Quadri, AD Goulding, C Papovich, KVH Tran, I Labbe, et al. 2018. “Decoupled Black Hole Accretion and Quenching : the Relationship Between BHAR, SFR and Quenching in Milky Way- and Andromeda-mass Progenitors Since Z=2.5.” Monthly Notices of the Royal Astronomical Society 473 (3): 3710–3716.
Chicago author-date (all authors)
Cowley, MJ, LR Spitler, RF Quadri, AD Goulding, C Papovich, KVH Tran, I Labbe, L Alcorn, RJ Allen, B Forrest, K Glazebrook, GG Kacprzak, G Morrison, T Nanayakkara, Caroline Straatman, and AR Tomczak. 2018. “Decoupled Black Hole Accretion and Quenching : the Relationship Between BHAR, SFR and Quenching in Milky Way- and Andromeda-mass Progenitors Since Z=2.5.” Monthly Notices of the Royal Astronomical Society 473 (3): 3710–3716.
Vancouver
1.
Cowley M, Spitler L, Quadri R, Goulding A, Papovich C, Tran K, et al. Decoupled black hole accretion and quenching : the relationship between BHAR, SFR and quenching in Milky Way- and Andromeda-mass progenitors since z=2.5. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2018;473(3):3710–6.
IEEE
[1]
M. Cowley et al., “Decoupled black hole accretion and quenching : the relationship between BHAR, SFR and quenching in Milky Way- and Andromeda-mass progenitors since z=2.5,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 473, no. 3, pp. 3710–3716, 2018.
@article{8582597,
  abstract     = {We investigate the relationship between the black hole accretion rate (BHAR) and star formation rate (SFR) for Milky Way (MW) and Andromeda (M31)-mass progenitors from z = 0.2 to 2.5. We source galaxies from the K-s-band-selected ZFOURGE survey, which includes multiwavelength data spanning 0.3-160 mu m. We use decomposition software to split the observed spectral energy distributions (SEDs) of our galaxies into their active galactic nuclei (AGNs) and star-forming components, which allows us to estimate BHARs and SFRs from the infrared (IR). We perform tests to check the robustness of these estimates, including a comparison with BHARs and SFRs derived from X-ray stacking and far-IR analysis, respectively. We find that, as the progenitors evolve their relative black hole-galaxy growth (i.e. their BHAR/SFR ratio) increases from low to high redshift. The MW-mass progenitors exhibit a log-log slope of 0.64 +/- 0.11, while the M31-mass progenitors are 0.39 +/- 0.08. This result contrasts with previous studies that find an almost flat slope when adopting X-ray-/AGN-selected or mass-limited samples and is likely due to their use of a broad mixture of galaxies with different evolutionary histories. Our use of progenitor-matched samples highlights the potential importance of carefully selecting progenitors when searching for evolutionary relationships between BHAR/SFRs. Additionally, our finding that BHAR/SFR ratios do not track the rate at which progenitors quench casts doubts over the idea that the suppression of star formation is predominantly driven by luminous AGN feedback (i.e. high BHARs).},
  author       = {Cowley, MJ and Spitler, LR and Quadri, RF and Goulding, AD and Papovich, C and Tran, KVH and Labbe, I and Alcorn, L and Allen, RJ and Forrest, B and Glazebrook, K and Kacprzak, GG and Morrison, G and Nanayakkara, T and Straatman, Caroline and Tomczak, AR},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {ACTIVE GALACTIC NUCLEI,STAR-FORMING GALAXIES,DEEP FIELD-SOUTH,HOST,GALAXIES,HIGH-REDSHIFT,EVOLUTION,QUASARS,AGN,CATALOG,STELLAR,galaxies: active,galaxies: evolution,galaxies: high-redshift,infrared: galaxies},
  language     = {eng},
  number       = {3},
  pages        = {3710--3716},
  title        = {Decoupled black hole accretion and quenching : the relationship between BHAR, SFR and quenching in Milky Way- and Andromeda-mass progenitors since z=2.5},
  url          = {http://dx.doi.org/10.1093/mnras/stx2587},
  volume       = {473},
  year         = {2018},
}

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