2019
DOI: 10.1093/mnrasl/slz163 View full text |Buy / Rent full text
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Abstract: Based on well established scaling relation for star forming galaxies as a function of redshift, we argue that the implied growth by a large factor of their angular momentum requires that the angular momentum of the inflowing gas fuelling star formation and disk growth must also secularly increase. We then propose that star formation in disks can cease (quench) once the accreted material (mainly atomic hydrogen) comes in with excessive angular momentum for sustaining an adequate radial flow of cold, molecular g… Show more

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“…We see that the specific angular momentum increased by a factor of ∼9 and the total stellar AM increases after the Grand Twirl at z ∼ 2 by a remarkable factor of ∼24 from 7.9 × 10 11 to 1.9 × 10 13 M ⊙ km s −1 kpc. The growth by such a remarkably large factor is in good agreement with recent studies (Swinbank et al 2017;Marasco et al 2019;Peng & Renzini 2020;Renzini 2020). In contrast, the specific angular momentum of the bulge-dominated galaxy decreases by one order of magnitude and ends up in the observational regime of elliptical galaxies.…”
Section: Stellar Disc Evolutionsupporting
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“…We see that the specific angular momentum increased by a factor of ∼9 and the total stellar AM increases after the Grand Twirl at z ∼ 2 by a remarkable factor of ∼24 from 7.9 × 10 11 to 1.9 × 10 13 M ⊙ km s −1 kpc. The growth by such a remarkably large factor is in good agreement with recent studies (Swinbank et al 2017;Marasco et al 2019;Peng & Renzini 2020;Renzini 2020). In contrast, the specific angular momentum of the bulge-dominated galaxy decreases by one order of magnitude and ends up in the observational regime of elliptical galaxies.…”
Section: Stellar Disc Evolutionsupporting
“…During this last epoch from z = 2t oz = 0, the stellar mass of the system grew from 1.2 × 10 10 to 3.4 × 10 10 M ⊙ by a factor of 2.7, the radius from 0.5 to 3.1 kpc by a factor of 5.8 and the rotation velocity from 94 to 144 km s −1 by a factor 1.5. As a result the total stellar AM increased by a factor of ∼24 (Swinbank et al 2017;Peng & Renzini 2020;Renzini2020). For the bulge-dominated galaxy, on the other hand, the disc component centred at ǫ =+ 1 does not grow significantly between the last starburst and the present epoch, while the bulge component sees its mass grow by a factor of 2.…”
Section: Kinematics Analysis Of the Stellar Discsmentioning
“…The lack of environmental dependence in the stellar metallicity difference between star-forming and passive central galaxies indicates, not surprisingly, that the starvation responsible for quenching central galaxies is not driven by environmental phenomena, but primarily by mass-related phenomena such as halo heating by AGN and halo gravitational shock heating, or the recently proposed angular momentum quenching (Peng & Renzini 2020;Renzini 2020), where a galaxy can be deprived of new molecular gas when the inflowing gas accreted from the IGM comes in with excessive angular momentum.…”
Section: Constraints On Environmental Quenchingmentioning
“…Yet, the AM evolution of individual galaxies remains largely unexplored. In a recent paper (Peng & Renzini 2020, hereafter PR20) we have argued that the stellar AM of galaxies that remain starforming all the way to the present should increase by a very large factor over the last ∼ 10 Gyr, i.e., since the Universe high-noon at redshift ∼ 2 (i.e., when the majority of galaxies settle into ordered rotation). The traditional approach to the origin of the AM of galaxies has been essentially theoretical, top-down from first physical principles.…”
Section: Introductionmentioning