Mapping the three-dimensional multi-band extinction and diffuse interstellar bands in the Milky Way with LAMOST

TL;DR

This paper utilizes large spectroscopic surveys like SDSS and LAMOST to map interstellar extinction, diffuse bands, and faint nebulae across the Milky Way, leveraging the standard pair technique on millions of stellar spectra.

Contribution

It introduces a novel application of the standard pair technique to large spectroscopic datasets for mapping interstellar features and calibrating wide-field imaging surveys.

Findings

Initial results from SDSS data demonstrate the method's effectiveness.

Preliminary LAMOST data analysis shows promising detection of interstellar features.

The approach enables large-scale, detailed mapping of interstellar medium properties.

Abstract

With modern large scale spectroscopic surveys, such as the SDSS and LSS-GAC, Galactic astronomy has entered the era of millions of stellar spectra. Taking advantage of the huge spectroscopic database, we propose to use a "standard pair" technique to a) Estimate multi-band extinction towards sightlines of millions of stars; b) Detect and measure the diffuse interstellar bands in hundreds of thousands SDSS and LAMOST low-resolution spectra; c) Search for extremely faint emission line nebulae in the Galaxy; and d) Perform photometric calibration for wide field imaging surveys. In this contribution, we present some results of applying this technique to the SDSS data, and report preliminary results from the LAMOST data.