On the Metallicities and Kinematics of the Circumgalactic Media of Damped Ly$\alpha$ Systems at $z \sim 2.5$

التفاصيل البيبلوغرافية
العنوان:	On the Metallicities and Kinematics of the Circumgalactic Media of Damped Ly$\alpha$ Systems at $z \sim 2.5$
المؤلفون:	Stawinski, Stephanie M. Urbano, Rubin, Kate H. R., Prochaska, J. Xavier, Hennawi, Joseph F., Tejos, Nicolas, Fumagalli, Michele, Rafelski, Marc, Kirby, Evan N., Lusso, Elisabeta, Hafen, Zachary
سنة النشر:	2023
المجموعة:	Astrophysics
مصطلحات موضوعية:	Astrophysics - Astrophysics of Galaxies
الوصف:	We use medium- and high-resolution spectroscopy of close pairs of quasars to analyze the circumgalactic medium (CGM) surrounding 32 damped Ly$\alpha$ absorption systems (DLAs). The primary quasar sightline in each pair probes an intervening DLA in the redshift range $1.610^{13}~\rm cm^{-2}$ within 100 kpc of DLAs are larger by $2\sigma$ than those measured in the CGM of Lyman break galaxies (C$_f(N_\text{CII})>0.89$ and C$_f(N_\text{SiII})=0.75_{-0.17}^{+0.12}$). Metallicity constraints derived from ionic ratios for nine CGM systems with negligible ionization corrections and $N_\text{HI}>10^{18.5}~\rm cm^{-2}$ show a significant degree of scatter (with metallicities/limits across the range $-2.06\lesssim\log Z/Z_{\odot}\lesssim-0.75$), suggesting inhomogeneity in the metal distribution in these environments. Velocity widths of $\text{CIV}\lambda1548$ and low-ionization metal species in the DLA vs. CGM sightlines are strongly ($>2\sigma$) correlated, suggesting they trace the potential well of the host halo over $R_\bot\lesssim300$ kpc scales. At the same time, velocity centroids for $\text{CIV}\lambda1548$ differ in DLA vs. CGM sightlines by $>100~\rm km\ s^{-1}$ for $\sim50\%$ of velocity components, but few components have velocities that would exceed the escape velocity assuming dark matter host halos of $\ge10^{12}M_\odot$. Comment: 44 pages, 21 Figures, 5 Tables, accepted for publication in ApJ
نوع الوثيقة:	Working Paper
DOI:	10.3847/1538-4357/acd34a
URL الوصول:	http://arxiv.org/abs/2305.11232
رقم الأكسشن:	edsarx.2305.11232
قاعدة البيانات:	arXiv

الوصف
DOI:	10.3847/1538-4357/acd34a