论文标题
即将进行的4-M ILMT调查的天文和光度标准候选者
Astrometric and photometric standard candidates for the upcoming 4-m ILMT survey
论文作者
论文摘要
国际液体镜望远镜（ILMT）是一款4米级调查望远镜，最近在2023年1月1日之前实现了第一盏灯，并有望在2023年1月1日之前摆动全面操作。它以固定的22'宽条纹将天空扫描，以$+29^o21'41'41'$的销量为中心，并以时延迟集成（TDI）模式（TDI）模式。我们在ILMT带中提供了一个完整的源目录，可以用作星体校准器。天体校准源的特征是从Gaia EDR3中提取的，因为它提供了对星体（$α$），DEC（$δ$），视差（$π$）和适当运动（$μ__{a^{α^{*}} $＆$＆$ un的$＆un的$＆us）的非常精确的测量。我们已经与SDSS DR17和Panstarrs-1（PS1）交叉匹配Gaia EDR3，并在G，R和我过滤器中以这些来源的明显大小补充了目录。我们还提出了具有光谱幅度的光谱确认的白色矮人的目录，可以用作光度校准器。生成的目录存储在SQLite数据库中，以用于基于查询的访问。我们还报告了与Gaia相比，与GAIA相比，使用ILMT观察到的恒星校准的TDI框架相比。
The International Liquid Mirror Telescope (ILMT) is a 4-meter class survey telescope that has recently achieved first light and is expected to swing into full operations by 1st January 2023. It scans the sky in a fixed 22' wide strip centered at the declination of $+29^o21'41''$ and works in Time Delay Integration (TDI) mode. We present a full catalog of sources in the ILMT strip that can serve as astrometric calibrators. The characteristics of the sources for astrometric calibration are extracted from Gaia EDR3 as it provides a very precise measurement of astrometric properties such as RA ($α$), Dec ($δ$), parallax ($π$), and proper motions ($μ_{α^{*}}$ & $μ_δ$). We have crossmatched the Gaia EDR3 with SDSS DR17 and PanSTARRS-1 (PS1) and supplemented the catalog with apparent magnitudes of these sources in g, r, and i filters. We also present a catalog of spectroscopically confirmed white dwarfs with SDSS magnitudes that may serve as photometric calibrators. The catalogs generated are stored in a SQLite database for query-based access. We also report the offsets in equatorial positions compared to Gaia for an astrometrically calibrated TDI frame observed with the ILMT.
