Enhanced star formation in z ∼ 6 quasar companions

被引:13
|
作者
Zana, Tommaso [1 ]
Gallerani, Simona [1 ]
Carniani, Stefano [1 ]
Vito, Fabio [1 ]
Ferrara, Andrea [1 ]
Lupi, Alessandro [2 ,3 ]
Di Mascia, Fabio [1 ]
Barai, Paramita [4 ,5 ]
机构
[1] Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy
[2] Univ Milano Bicocca, Dipartimento Fis G Occhialini, Piazza Sci 3, IT-20126 Milan, Italy
[3] Ist Nazl Fis Nucl, Sez Milano Bicocca, Piazza Sci 3, IT-20126 Milan, Italy
[4] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Av Estados 5001, BR-09210580 Santo Andre, SP, Brazil
[5] Univ Cidade Sao Paulo, Nucleo Astrofis, Rua Galvao Bueno 868, BR-01506000 Sao Paulo, SP, Brazil
基金
巴西圣保罗研究基金会; 欧盟地平线“2020”;
关键词
methods: numerical; galaxies: evolution; galaxies: high-redshift; galaxies: star formation; (galaxies:) quasars: general; (galaxies:) quasars: supermassive black holes; SUPERMASSIVE BLACK-HOLES; HIGH-REDSHIFT QUASARS; ACTIVE GALACTIC NUCLEI; X-RAY OBSERVATIONS; GREATER-THAN; 6; C II EMISSION; HOST GALAXIES; COSMOLOGICAL SIMULATIONS; FORMING GALAXIES; SUPERCRITICAL ACCRETION;
D O I
10.1093/mnras/stac978
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Quasars powered by supermassive black holes (>10(8) M-circle dot) at z similar to 6 are predicted to reside in cosmic overdense regions. However, observations so far could not confirm this expectation due to limited statistics. The picture is further complicated by the possible effects of quasar outflows (i.e. feedback) that could either suppress or stimulate the star formation rate (SFR) of companion galaxies, thus modifying the expected bias. Here, we quantify feedback effects on the properties and detectability of companions by comparing cosmological zoom-in simulations of a quasar in which feedback is either included or turned-off. With respect to the no-feedback case, companions (a) directly impacted by the outflow have their SFR increased by a factor of 2-3, and (b) tend to be more massive. Both effects shift the [C ii] 158 mu m and UV luminosity functions towards brighter magnitudes. This leads us to conclude that quasar feedback slightly increases the effective quasar bias, boosting the number density of observable quasar companions, in agreement with what has been found around the brightest quasars of recent Atacama Large Millimeter Array (ALMA) [C ii] surveys. Deeper observations performed with James Webb Space Telescope and/or ALMA will improve the statistical significance of this result by detecting a larger number of fainter quasar companions.
引用
收藏
页码:2118 / 2135
页数:18
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