SDSS-IV MaNGA: the physical origin of off-galaxy H α blobs in the local Universe
學年 110
學期 1
出版（發表）日期 2021-10-02
作品名稱 SDSS-IV MaNGA: the physical origin of off-galaxy H α blobs in the local Universe
作品名稱（其他語言）
著者 Xihan Ji, Cheng Li, Renbin Yan, Houjun Mo, Lihwai Lin, Hu Zou, Jianhui Lian, David V Stark, Rogemar A Riffel, Hsi-An Pan, Dmitry Bizyaev, Kevin Bundy
單位
出版者
著錄名稱、卷期、頁數 Monthly Notices of the Royal Astronomical Society 508(3), p.3943-3966
摘要 H α blobs are off-galaxy emission-line regions with weak or no optical counterparts. They are mostly visible in H α line, appearing as concentrated blobs. Such unusual objects have been rarely observed and studied, and their physical origin is still unclear. We have identified 13 H α blobs in the public data of MaNGA survey, by visually inspecting both the optical images and the spatially resolved maps of H α line for ∼4600 galaxy systems. Among the 13 H α blobs, 2 were reported in previously MaNGA-based studies and 11 are newly discovered. This sample, though still small in size, is by far the largest sample with both deep imaging and integral field spectroscopy. Therefore, for the first time we are able to perform statistical studies to investigate the physical origin of H α blobs. We examine the physical properties of these H α blobs and their associated galaxies, including their morphology, environments, gas-phase metallicities, kinematics of ionized gas, and ionizing sources. We find that the H α blobs in our sample can be broadly divided into two groups. One is associated with interacting/merging galaxy systems, of which the ionization is dominated by shocks or diffuse ionized gas. It is likely that these H α blobs used to be part of their nearby galaxies, but were stripped away at some point due to tidal interactions. The other group is found in gas-rich systems, appearing as low-metallicity star-forming regions that are visually detached from the main galaxy. These H α blobs could be associated with faint discs, spiral arms, or dwarf galaxies.
關鍵字 galaxies: evolution;galaxies: ISM;galaxies: peculiar
語言 en_US
ISSN 1365-2966
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/122462 )