Category: Data

Completion of GLASS NIR data release v001

With the release of the NIR data products and redshift catalogs for the clusters A370, MACS0416, MACS0744, the GLASS NIR v001 data release is now complete! All data products including individually extracted grism spectra in 1D and 2D as well as redshift catalogs for all 10 GLASS clusters are available on the GLASS MAST webpage: https://archive.stsci.edu/prepds/glass/.

If you find any of the GLASS products useful, please cite:

And in particular, if you used the MACS0416 redshift catalog, please also cite:

Hoag et al. (2016), ApJ, submitted, arxiv 1603.00505

GLASS Fall 2015 release available

The GLASS data products, including the GLASS redshift catalogs, for the HFF clusters A2744 and MACS1149 are now available on the GLASS MAST webpage: https://archive.stsci.edu/prepds/glass/. Similar to the redshift catalog released for MACS0717 presented in the GLASS survey paper Treu et al. (2015), the cluster over-density is clearly detected in the redshift distributions (See above figure).

Note that the full redshift catalog for MACS1149 also includes redshifts from VLT-MUSE, Keck-DEIMOS, and the deep G141 HST grism spectroscopy from HST-GO-14041.

If you find any of the GLASS products useful, please cite:

If you used the full MACS1149 redshift catalog, please also cite:

GLASS Summer 2015 data release now available

The GLASS data products, including the GLASS redshift catalogs, for the four clusters MACS1423, MACS2129, RXJ1347, and RXJ2248 are now available on the GLASS MAST webpage: https://archive.stsci.edu/prepds/glass/
Similar to the redshift catalog released for MACS0717 presented in the GLASS survey paper Treu et al. (2015), the cluster over-density is clearly detected in the redshift distributions for these four clusters (See above figure).

If you find any of these GLASS products useful, please cite:

 

GLASS Survey Paper and First Data Release

Today we released the GLASS survey paper together with the first data product of the survey.
The paper gives a thorough overview of GLASS and its science goals.
We utilize the Hubble Frontier Field cluster MACSJ0717, the first cluster to be observed by GLASS, to illustrate the data quality and the high-level data products we will be releasing for each of the 10 GLASS clusters.
From a visual inspection with GiG and GiGz of each spectrum brighter than H_AB = 23 we measure the redshift when sufficient information is present in the spectra.
Furthermore, we conduct a thorough search for emission lines through all the GLASS WFC3 spectra with the aim of measuring redshifts for sources with continuum fainter than H_AB = 23.
As a product of these efforts, we present a catalog of 139 emission-line based spectroscopic redshifts for extragalactic sources, including three new redshifts of multiple imaged systems.

The GLASS survey paper: http://adsabs.harvard.edu/abs/2015arXiv150900475T
The GLASS data products: https://archive.stsci.edu/prepds/glass/
The GLASS inspection software: https://github.com/kasperschmidt/GLASSinspectionGUIs

MACS1423.8+2404 Complete

As of April 15 2014 the GLASS observations of the cluster MACS1423.8+2404 have been completed, i.e., 14 orbits split between imaging in F105W and F140W and grism spectroscopy in G102 and G141 as well as 14 orbits of imaging in F814W and grism spectroscopy in G800L.

Hence, the observations of 2 out of the 10 GLASS clusters are complete… and counting.

MACS0717.5+3745 Complete

As of 2014 February 19 the GLASS observation of MACS0717 are complete. Hence, the full GLASS data set on the first of the 10 targeted clusters is available and ready for exploration.

The dataset includes 4 orbits of HST WFC3 G141 grism spectroscopy, 10 orbits of HST WFC3 G102 grism spectroscopy, and 2×7 orbits of HST ACS G800L grism spectroscopy. The WFC3 data are all on the core of the cluster taken at two different position angles to minimize the effect of contamination. The ACS spectroscopy are on the two parallel fields.