.png){kind=icon}
.png){kind=icon}
Return
SDSS-V Local Volume Mapper (LVM): Helix Nebula public data, Data Analysis Pipeline data products
.png){kind=icon}
PRE
AI
DOI：10.22201/ia.30618649e.2026.62.01.7521.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
We present a spatially resolved spectroscopic analysis of the Helix Nebula (NGC 7293) using data from the SDSS-V Local Volume Mapper (LVM) by applying the recently developed LVM Data Analysis Pipeline (LVM-DAP). Covering the full optical range (3600-9800 angstrom) over a contiguous similar to 0.5 degrees field, the LVM data provide the first hexagonally sampled wide-field emission line maps of all major ionic species in this archetypal planetary nebula. The resulting flux, kinematic, and line-ratio maps reveal the well-known ionization stratification of the nebula, from the compact He++ core to the bright [O III] ring and the extended low-ionization envelope, enabling a detailed comparison with the classical aperture spectroscopy. Owing to the sensitivity and uniform spatial sampling of the LVM, numerous faint auroral and diagnostic lines are detected across the nebula, including [O III] 4363, [N II] 5755, and He I lines, allowing for precise measurements of the weak-line morphology. The derived radial trends confirm the remarkably low dust content and overall homogeneity of the electron temperature and density across the main ring. Ionized-gas kinematics traced by H alpha further support the scenario of a slowly expanding, limb-brightened shell, consistent with previous studies. This study demonstrates the diagnostic power of LVM spectroscopy for extended nebulae and highlights its capability to recover both global and spatially resolved physical conditions across complex ionized structures.
Keywords:
ISM: kinematics and dynamics
ISM: lines and bands
methods: data analysis
planetary nebulae: individual: NGC 7293
techniques: imaging spectroscopy
Journal
R
IF:
1.7
Papers:
10
Citations:
0
Organization
View more organizations