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Narrow absorption lines with two observations of Sloan Digital Sky Survey
Zhi-Fu Chen, Qiu-Sheng Gu, Yan-Mei Chen +1
We assemble 3524 quasars from Sloan Digital Sky Survey (SDSS) with repeated observations to search for variations of narrow C IV1548,1551 and Mg II2796,2803 absorption doublets in…
X-ray emissivity of old stellar populations: a local group census
Chong Ge, Zhiyuan Li, Xiaojie Xu +6
We study the unresolved X-ray emission in three Local Group dwarf elliptical galaxies (NGC 147, NGC 185 and NGC 205) using XMM-Newton observations, which most likely originates fro…
Spatially-Resolved Dense Molecular Gas and Star Formation Rate in M51
Hao Chen, Yu Gao, Jonathan Braine +1
We present the spatially-resolved observations of HCN J = 1 -- 0 emission in the nearby spiral galaxy M51 using the IRAM 30 m telescope. The HCN map covers an extent of $4\arcmin\t…
The Weak Carbon Monoxide Emission In An Extremely Metal Poor Galaxy, Sextans A
Yong Shi, Junzhi Wang, Zhi-Yu Zhang +5
Carbon monoxide (CO) is one of the primary coolants of gas and an easily accessible tracer of molecular gas in spiral galaxies but it is unclear if CO plays a similar role in metal…
Detection of a Compact Nuclear Radio Source in the Local Group Elliptical Galaxy M32
Yang Yang, Zhiyuan Li, Loránt O. Sjouwerman +4
The Local Group compact elliptical galaxy M32 hosts one of the nearest candidate super-massive black holes (SMBHs), which has a previously suggested X-ray counterpart. Based on sen…