Mission Overview
Formation History of Ultra-Faint Dwarf Galaxies (FHUFD)
Primary Investigator: Tom Brown
HLSP Authors: Tom Brown
Released: 2018-01-24
Updated: 2018-01-24
Primary Reference(s): Brown et al. 2014
DOI: 10.17909/T99H5G
Citations: See ADS Statistics
Overview
The following proposals are relevant to this HSLP: HST Program 12549
FHUFD is a deep, high-precision, photometric survey of six ultra-faint dwarf galaxy satellites of the Milky Way, in order to discern any cosmologically-driven synchronization of their formation histories. For six ultra-faint dwarf satellites of the Milky Way (Bootes I, Coma Berenices, Canes Venatici II, Hercules, Leo IV, and Ursa Major I), the team provides ACS photometry, astrometry, and co-added (drizzled) images. The photometry and images are in two bands: F606W (broad V) and F814W (I), using the STMAG photometric system. The astrometry is given in equatorial coordinates (degrees, J2000). The drizzled images have a scale of 0.03 arcsec/pix. The images from each pointing are contained in their own FITS files. Each galaxy also has a single catalog file containing the point sources detected in the images.
Data Products
The drizzled images are stored as FITS files with the following naming convention:
hlsp_fhufd_hst_acs_<galaxy><##>_<filter>_v2.0_drz.fits
where:
- <galaxy> = name of the galaxy, e.g., "ursamajori"
- <##> = the pointing number, as a two-digit zero-padded integer
- <filter> = the filter used, either "f606w" or "f814w"
The source catalogs follow a similar naming convention, except there is no pointing number component, and the string "multi" is used instead of the filter. The extension for the source catalogs is "*cat.fits".
Data Access
Both the catalogs and the image products are available via the direct download links below. The image observations are also available in the MAST Portal and astroquery. Set the 'Provenance Name' filter to FHUFD in the Portal Advanced Search to match all observations. The observations can also be retrieved programmatically using the astroquery.mast module. The code example below retrieves all products and allows you to download them via a bash script.
from astroquery.mast import Observations
all_obs = Observations.query_criteria(provenance_name="fhufd")
data_products = Observations.get_product_list(all_obs)
Observations.download_products(data_products, curl_flag=True)
-
A web-based interface for cross-mission searches of data at MAST or the Virtual Observatory
-
Search for and retrieve FHUFD data products programmatically.
| Field | R.A. (J2000) | Dec. (J2000) | Exptime F606W (sec) | F814W (sec) | Images | Catalogs |
|---|---|---|---|---|---|---|
| Bootes I | 14:00:04 | +14:30:47 | 2340 | 2200 | FITS Files | Source Catalog |
| Canes Venatici II | 12:57:10 | +34:19:23 | 20850 | 20850 | FITS Files | Source Catalog |
| Coma Berenices | 12:27:21 | +23:53:13 | 2340 | 2200 | FITS Files | Source Catalog |
| Hercules | 16:31:05 | +12:47:07 | 12880 | 12745 | FITS Files | Source Catalog |
| Leo IV | 11:32:57 | -00:31:00 | 20530 | 20530 | FITS Files | Source Catalog |
| Ursa Major I | 10:35:04 | +51:56:51 | 4215 | 3725 | FITS Files | Source Catalog |