spacer link to MAST page spacer logo image spacer

Most STScI network links to services and websites will be UNAVAILABLE Thursday May 3, 2018 7:00 PM - 11:00 PM.

Formation History of Ultra-Faint Dwarf Galaxies ("FHUFD")

Brown et al. 2014, ApJ, 796, 91

Introduction

Description of Data Products

Data Access

Download README


Color image of Leo IV. Image source: http://hubblesite.org/news_release/news/2012-26.

Introduction

FHUFD (HST Proposal #12549) 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.

Description of 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

Field R.A. (J2000) Dec. (J2000) Exptime
F606W (sec)
Exptime
F814W (sec)
F606W Images F814W Images Catalog File
Bootes I 14:00:04 +14:30:47 2340 2200 F606W Images F814W Images Source Catalog
Canes Venatici II 12:57:10 +34:19:23 20850 20850 F606W Images F814W Images Source Catalog
Coma Berenices 12:27:21 +23:53:13 2340 2200 F606W Images F814W Images Source Catalog
Hercules 16:31:05 +12:47:07 12880 12745 F606W Images F814W Images Source Catalog
Leo IV 11:32:57 -00:31:00 20530 20530 F606W Images F814W Images Source Catalog
Ursa Major I 10:35:04 +51:56:51 4215 3725 F606W Images F814W Images Source Catalog