COS-Halos Dataset¶
This document describes the COS-Halos dataset.
Sources¶
The COS-Halos Survey is a set of HST/COS (Tumlinson et al. (2013)) and Keck/HIRES spectra (Werk et al. (2013)) for the analysis of the circumgalactic medium of z~0.2 galaxies. The quasars are a set of sources from the SDSS with zem ~ 0.3 to 1. and bright in the FUV.
Meta Data¶
The additional meta data are from Table 1 and include the following for the HST/COS rows.
| Key | Type | Description |
|---|---|---|
| m_FUV | float | FUV magnitude from GALEX |
| t_G130M | float | Exposure time (sec) for the G130M grating |
| t_G160M | float | Exposure time (sec) for the G160M grating |
| Visit | str | Visit ID(s) |
Use pyigm to access the measurements from the COS-Halos survey.
Spectra¶
The HST/COS spectra are wavelength and flux calibrated spectra using CALCOS and then coadded with proprietary code (see Tumlinson et al. 2013).
The Keck/HIRES spectra are standard HIRedux reductions (see Werk et al. 2013). These spectra are normalized.