We show the radial dependence of stellar baryon fraction curves derived for 21 lensing galaxies from the CfA-Arizona Space Telescope LEns Survey by means of stellar population synthesis and pixel-based mass reconstruction. The sample covers a stellar mass range of Ms~2x10^9-3x10^11 Msol (solar masses) which corresponds to a total mass range of ML~7x10^9-3x10^12 Msol on scales from 0.25 to 5 Re (effective radii). By examining the Ms-to-ML dependence on radial distance to the center of each galaxy we find pairs of lenses on small to intermediate mass scales which approach at large radii the same values for their enclosed total mass but exhibit very different stellar masses and stellar baryon fractions. This behaviour subsides for the most massive lenses. All baryon fraction profiles show that the dark matter halo overtakes the stellar content between 1.5 and 2.5 Re. We find evidence for a stellar baryon fraction steadily declining over the full mass range. We shed light on the Fundamental Plane puzzle by showing that the slope of the ML(<R)-to-Ms(<R) relation approaches the mass-to-light relation of recent Fundamental Plane studies at large radii. Less massive dark matter halos turn out to be influenced by the distribution of stellar matter on resolved scales below 10 kpc. The ongoing study of resolved baryon fraction profiles will make it possible to evaluate the validity of star formation models as well as adiabatic contraction prescriptions commonly used in simulations. [abridged]
Disentangling the Halo: Joint Model for Measurements of the Kinetic Sunyaev-Zeldovich Effect and Galaxy-Galaxy Lensing
Princeton University(普林斯顿大学);Cornell University(康奈尔大学);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);University of California, Berkeley(加州大学伯克利分校);Stanford University(斯坦福大学)
Emergent gravity fails to explain color-dependent galaxy-galaxy lensing signals from SDSS Dr7
我们使用基于SDSS DR 7数据的星系-星系透镜技术来检验涌现引力(EG)理论。在EG的情况下,我们不期望颜色依赖的星系样本中的“表观暗物质”预测EG,这是只施加重子质量。如果重子质量相似,那么根据EG,从重子质量预测的透镜轮廓应该是相似的,不管星系样本的颜色如何。我们使用星系的恒星质量作为其重子质量的代理。我们将星系样本分为5个恒星质量仓,并在每个恒星质量仓中将它们进一步分类为红色和蓝色子样本。如果我们设置晕质量和浓度为自由参数,$Λ$ CDM是有利于我们的数据方面的约化$χ^2$,而EG未能解释的颜色依赖性的ESD从星系-星系透镜测量。
Baryonic mass budgets in the central regions of the Bullet Cluster and their consistency with strong lensing in MOND
University of Bonn(波恩大学);Institute for Advanced Studies in Basic Sciences (IASBS)(基础科学高等研究所);Institute for Research in Fundamental Sciences (IPM)(基础科学研究院);University of Portsmouth(朴茨茅斯大学);Yonsei University(延世大学)
The Baryonic Mass-Halo Mass Relation of Extragalactic Systems
Case Western Reserve University(凯斯西储大学);Max Planck Institute for Extraterrestrial Physics(马克斯·普朗克地外物理研究所);Università degli Studi di Firenze(佛罗伦萨大学);INAF — Arcetri Astrophysical Observatory(意大利国家天体物理研究所——阿切特里天文台);University of Oregon(俄勒冈大学);Nanjing University(南京大学)
We present a study of seventeen LAEs at redshift 2$<z<$3 gravitationally lensed by massive early-type galaxies (ETGs) at a mean redshift of approximately 0.5. Using a fully Bayesian grid-based technique, we model the gravitational lens mass distributions with elliptical power-law profiles and reconstruct the UV-continuum surface brightness distributions of the background sources using pixellated source models. We find that the deflectors are close to, but not consistent with isothermal models in almost all cases, at the $2σ$-level. We take advantage of the lensing magnification (typically $μ\s…
Model-Independent Measurement of Baryon Gas Fractions through Galaxy-Galaxy Lensing and the Kinematic Sunyaev-Zel'dovich Effect
University of California, Berkeley(加州大学伯克利分校);Lawrence Berkeley National Laboratory(劳伦斯伯克利国家实验室);Berkeley Center for Cosmological Physics(伯克利宇宙物理学中心);University of Cambridge(剑桥大学);Kavli Institute for Cosmology Cambridge(卡弗里宇宙学剑桥研究所);Stanford University(斯坦福大学);SLAC National Accelerator Laboratory(SLAC国家加速器实验室)
Improved strong lensing modelling of galaxy clusters using the Fundamental Plane: Detailed mapping of the baryonic and dark matter mass distribution of Abell S1063
Strong gravitational lensing (SL) has emerged as a very accurate probe of the mass distribution of cluster- and galaxy-scale dark matter (DM) haloes in the inner regions of galaxy clusters. The derived properties of DM haloes can be compared to the predictions of high-resolution cosmological simulations, providing us with a test of the Standard Cosmological Model. The usual choice of simple power-law scaling relations to link the total mass of members with their luminosity is one of the possible inherent systematics within SL models of galaxy clusters, and thus on the derived cluster masses. U…
The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: A Catalogue of Strong Galaxy-Galaxy Lens Candidates
我们在斯隆数字巡天(SDSS)第十六次数据发布(DR 16)的扩展重子振荡光谱巡天(eBOSS)中包含的$\approx2$百万个星系光谱中,光谱检测到838个可能的候选者,448个可能的候选者和265个可能的强透镜候选者。我们应用重子振荡光谱巡天(BOSS)发射线透镜巡天(BELLS)的光谱检测方法,并添加高斯拟合信息,分级,额外的检查观测量和额外的检查方法来改进我们的选择方法。我们在SDSS-I/II的Legacy调查和DESI Legacy调查的低分辨率图像中观察到477名候选人具有透镜证据,这比使用类似透镜证据观察到的BELLS候选人的百分比高$12\%$。我们在BOSS调查的最新和改进的缩减范围内进行的搜索,在搜索所有BOSS和eBOSS星系时,预期透镜候选者的数量增加了$20\%$。我们的候选者的目标和背景红移的分布是类似的候选者和确认的透镜内的贝尔观测。我们在SDSS DR 16的增值目录(VAC)中展示了我们的透镜物体光谱识别(SILO)候选者。在后续的高分辨率成像中对这些透镜候选者的检查可能会产生比SDSS中以前的光谱检测调查中发现的透镜多两倍的透镜,这将把SDSS中以前的透镜调查结果扩展到更高的红移,限制螺旋星系中质量结构的模型,并测试在低分辨率图像中包括可能的透镜特征的识别是否对光谱检测程序有价值。
Recent analyses show that $Λ$CDM-based models optimised to reproduce the clustering of massive galaxies overestimate their gravitational lensing by about 30\%, the so-called lensing is low problem. Using a state-of-the-art hydrodynamical simulation, we show that this discrepancy reflects shortcomings in standard galaxy-halo connection models rather than tensions within the $Λ$CDM paradigm itself. Specifically, this problem results from ignoring a variety of galaxy formation effects, including assembly bias, segregation of satellite galaxies relative to dark matter, and baryonic effects on the …
The existence of the flat rotation curves of galaxies is still perplexing. The dark matter paradigm was proposed long ago to solve this conundrum; however, this proposal is still under debate. In this paper, we search for universal relationships solely involving the baryonic density that incorporate both galactic dynamics and gravitational lensing in galaxy clusters without requiring dark matter. If this type of formula exists, we show that it is possible that it can clearly indicate that dark matter is either perfectly tailored to baryonic matter or, from a more radical point of view, even pe…