X-ray scaling relations of early-type galaxies in IllustrisTNG and a new way of identifying backsplash objects

被引:2
|
作者
Wang, Yunchong [1 ,2 ]
Vogelsberger, Mark [3 ,4 ]
Kim, Dong-Woo [5 ]
Borrow, Josh [3 ]
Smith, Aaron [5 ]
Hernquist, Lars [5 ]
Lin, Wenjie [6 ]
机构
[1] Stanford Univ, Phys Dept, 382 Via Pueblo Mall, Stanford, CA 94305 USA
[2] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA
[3] MIT, Dept Phys, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
[4] MIT, NSF Inst Artificial Intelligence & Fundamental In, Cambridge, MA 02139 USA
[5] Ctr Astrophys Harvard & Smithsonian, 60 Garden St, Cambridge, MA 02138 USA
[6] Columbia Univ, Dept Mech Engn, New York, NY 10027 USA
关键词
galaxies: elliptical and lenticular; cD; X-rays: galaxies: clusters; galaxies: clusters: intracluster medium; methods: numerical; BLACK-HOLE FEEDBACK; STAR-FORMATION ACTIVITY; ACTIVE GALACTIC NUCLEI; DARK-MATTER FRACTIONS; MASS DENSITY SLOPES; HOT GAS; COSMOLOGICAL SIMULATIONS; CIRCUMGALACTIC MEDIUM; QUENCHED FRACTIONS; ATLAS(3D) PROJECT;
D O I
10.1093/mnras/stad3629
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate how feedback and environment shapes the X-ray scaling relations of early-type galaxies (ETGs), especially at the low-mass end. We select central-ETGs from the TNG100 box of IllustrisTNG that have stellar masses log(10)(M-*/M-circle dot) is an element of [10.7, 11.9]. We derive mock X-ray luminosity (L-X,L- 500) and spectroscopic-like temperature (T-sl,T- 500) of hot gas within R-500 of the ETG haloes using the MOCK-X pipeline. The scaling between L-X,L- 500 and the total mass within 5 effective radii (M-5Re) agrees well with observed ETGs from Chandra. IllustrisTNG reproduces the observed increase in scatter of L-X,L- 500 towards lower masses, and we find that ETGs with log(10)(M-5Re/M-circle dot) <= 11.5 with above-average L-X,L- 500 experienced systematically lower cumulative kinetic AGN feedback energy historically (vice versa for below-average ETGs). This leads to larger gas mass fractions and younger stellar populations with stronger stellar feedback heating, concertedly resulting in the above-average L-X,L- 500. The L-X,L- 500-T-sl,T- 500 relation shows a similar slope to the observed ETGs but the simulation systematically underestimates the gas temperature. Three outliers that lie far below the L-X-T-sl relation all interacted with larger galaxy clusters recently and demonstrate clear features of environmental heating. We propose that the distinct location of these backsplash ETGs in the L-X-T-sl plane could provide a new way of identifying backsplash galaxies in future X-ray surveys.
引用
收藏
页码:6763 / 6778
页数:16
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