分类： 天文学 >> 天文学 提交时间： 2023-02-19
Junyao Li
John D. Silverman
Xuheng Ding
Michael A. Strauss
Andy Goulding
Simon Birrer
Hassen M. Yesuf
Yongquan Xue
Lalitwadee Kawinwanichakij
Yoshiki Matsuoka
Yoshiki Toba
Tohru Nagao
Malte Schramm
Kohei Inayoshi
摘要： The relationship between quasars and their host galaxies provides clues on
how supermassive black holes (SMBHs) and massive galaxies are jointly
assembled. To elucidate this connection, we measure the structural and
photometric properties of the host galaxies of ~5000 SDSS quasars at 0.2
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Junyao Li
John D. Silverman
Xuheng Ding
Michael A. Strauss
Andy Goulding
Malte Schramm
Hassen M. Yesuf
Mouyuan Sun
Yongquan Xue
Simon Birrer
Jingjing Shi
Yoshiki Toba
Tohru Nagao
Masatoshi Imanishi
摘要： We measure the evolution of the $M_{\rm BH}-M_*$ relation using 584
uniformly-selected SDSS quasars at $0.2
分类： 天文学 >> 天文学 提交时间： 2023-02-19
Weichen Wang
Susan A. Kassin
S. M. Faber
David C. Koo
Emily C. Cunningham
Hassen M. Yesuf
Guillermo Barro
Puragra Guhathakurta
Benjamin Weiner
Alexander de la Vega
Yicheng Guo
Timothy M Heckman
Camilla Pacifici
Bingjie Wang
Charlotte Welker
摘要： Strong galactic winds are ubiquitous at $z\gtrsim 1$. However, it is not well known where inside galaxies these winds are launched from. We study the cool winds ($\sim 10^4$\,K) in two spatial regions of a massive galaxy at $z=1.3$, which we nickname the "Baltimore Oriole's Nest." The galaxy has a stellar mass of $10^{10.3\pm 0.3} M_\odot$, is located on the star-forming main sequence, and has a morphology indicative of a recent merger. Gas kinematics indicate a dynamically complex system with velocity gradients ranging from 0 to 60 $\mathrm{km}\cdot\mathrm{s}^{-1}$. The two regions studied are: a dust-reddened center (Central region), and a blue arc at 7 kpc from the center (Arc region). We measure the \ion{Fe}{2} and \ion{Mg}{2} absorption line profiles from deep Keck/DEIMOS spectra. Blueshifted wings up to 450 km$\cdot$s$^{-1}$ are found for both regions. The \ion{Fe}{2} column densities of winds are $10^{14.7\pm 0.2}\,\mathrm{cm}^{-2}$ and $10^{14.6\pm 0.2}\,\mathrm{cm}^{-2}$ toward the Central and Arc regions, respectively. Our measurements suggest that the winds are most likely launched from both regions. The winds may be driven by the spatially extended star formation, the surface density of which is around 0.2 $M_\odot\,\mathrm{yr}^{-1}\cdot \mathrm{kpc}^{-2}$ in both regions. The mass outflow rates are estimated to be $4\,M_\odot\,\mathrm{yr}^{-1}$ and $3\,M_\odot\,\mathrm{yr}^{-1}$ for the Central and Arc regions, with uncertainties of one order-of-magnitude or more. Findings of this work and a few previous studies suggest that the cool galactic winds at $z\gtrsim 1$ might be commonly launched from the entire spatial extents of their host galaxies due to extended galaxy star formation.
点击量
待评议
点击量
下载量
评论
