The Multimission Archive at STScI Newsletter
Table of Contents
New data available in this release include the completion of WFPC2 processing, including those data that were still proprietary at the time of the last release, and the addition of multi-wavelength source lists for ACS and WFPC2 data. New sets of High-Level Science Products, including the Early-Release Science WFC3 observations and the first images from the Multi-Cycle Treasury program CANDELS, have also become available. Starting with DR5, the HLA is transitioning to an incremental data release process, and new data - including processed WFC3 and COS products - are expected to become available over the next few months.
Data Release 4, released in March 2010, included visit-level combined data for all science observations with imaging instruments – Advanced Camera for Surveys (ACS), Wide Field Planetary Camera 2 (WFPC2), and Near Infrared Camera and Multi-Object Spectrometer (NICMOS) – that were publicly available through February 2010.
Generally, HLA includes two categories of advanced data products: mosaics and High-Level Science Products (HLSPs). Mosaics increase depth and widen sky coverage (http://hla.stsci.edu/hla_faq.html - mosaics). Hubble HLSPs are based on fully processed—reduced, co-added, cosmic-ray cleaned, etc.—Hubble images and spectra, and all are ready for scientific analysis. These HLSPs represent the best that can currently be done with Hubble data. HLA also provides visit-level combined images. A detailed description of advanced and visit-level data products for the HLA can be found on the “Getting Started” page at http://hla.stsci.edu/hla_help.html. Several movie tutorials are also available (http://hla.stsci.edu/hla_movie.html) to help new users understand the capabilities of the HLA interface.
Kepler was launched into an Earth-trailing heliocentric orbit on March 6, 2009, and will stare at a 105 square degree region of the sky in the constellations of Cygnus and Lyra. The goal of the mission is to obtain precise long-term light curves of up to 170,000 cool stars and to search for periodic transits of planets as small as the Earth. A secondary objective is to study rapid oscillations of the target stars in order to determine their ages, radii, and chemical compositions. A general overview of the mission and more details about the scientific objectives can be found at the Kepler Mission website (http://kepler.nasa.gov/). Kepler has now monitored the same field in the sky for about half of its nominal 3.5 year lifetime.
MAST is the Kepler archive holding not only the data but also important documentation such as the Kepler Data Release Notes The MAST/Kepler website can be found at http://archive.stsci.edu/kepler/. Kepler data may be retrieved through the standard MAST/Kepler search and retrieval interface. Public data can also be retrieved via your browser or via ftp as single light curves or bundled as large tar files. For more information on these alternative retrieval methods see http://archive.stsci.edu/kepler/publiclightcurves.html.
Coinciding with Kepler's Cycle 3 guest-observer (GO) season, MAST is happy to announce the availability of a cross-match tool between GALEX sources and the Kepler initial catalog. Its purpose is to extend the wavelength baseline from the optical magnitudes of Kepler ground support (Sloan-like g, r, i, and z filters) to near- and far-ultraviolet bandpasses. This extension is especially important for selecting hot star targets when only photometric data are available.
The cross-match tool is available two ways: by an interface form (http://archive.stsci.edu/kepler/kgmatch/search.php) and by Structured Query Language (SQL) queries in the CasJobs tool environment at (http://mastweb.stsci.edu/kplrcasjobs/).
The form has the classic look and feel of other MAST mission-data retrieval forms. It works for simple queries that yield a relatively small list of results (<15,000 rows). As with other standard MAST interfaces, this interface can be access programmatically as a web service.
The SQL interface in CasJobs (originally developed by the Department of Physics & Astronomy at the Johns Hopkins University) is better suited for large, batch queries. CasJobs remains the recommended way to access the Kepler database for users interested in storing the result of their queries on MAST databases, and for group collaborations.
The cross-match tool allows easy access to objects observed by both Kepler and GALEX. The data represent one-to-one matches within a search radius of 2.5 arcsec of the position of a Kepler object. A list of possible GALEX matches within a search radius of 5 arcsecs is also included. Generally, automated cross-match algorithms, such as the one used by MAST, cannot always unambiguously select the correct match between objects observed by different missions. MAST therefore provides CasJobs users with a comprehensive list of objects ranked by distance from the match. Both the classic Seach Form and CasJobs support uploads of target lists.
All data for the General Release 6 (GR6) of the GALEX All-Sky Imaging Survey (AIS) has been delivered to MAST, completing the GR6 imaging release. The data are available on the MAST/GALEX web site. A description of the most notable changes between GR6 and the old GR4/5 can be found at http://galex.stsci.edu/doc/gr6_cs.txt. A delivery of GR6 grism data products, expected in 2011, will complete the GR6 data delivery. The grism data will be available on the News corner and on the table of survey tiles, both located on the MAST/GALEX home page.
The first table below shows the number of tiles available for each GALEX survey in each release. The second table below shows the exposure time (Ksec) of each survey for each data release.
1Data for GALEX Releases 1 and 2/3 are no longer available at MAST.
The operations phase of the GALEX mission has been planned to end on September 30, 2012. In the intervening time, GALEX began to observe sky regions of high science value that have not yet been well observed – or in some cases not observed at all. The GALEX project plans to deliver the data to MAST in monthly installments which will be made publicly available immediately upon ingest. These deliveries are "secondary MIS" datasets (Medium Imaging Survey), and can be found within the MIS survey area of the MAST/GALEX web site. First notice of availability will appear on the News corner of the GALEX home page. This notice will contain a link to a list of secondary MIS tiles, which will grow over the duration of this observing program.
The timeline for the operations phase of the GALEX mission is at this time somewhat uncertain. The President's FY12 budget contains only 100K for GALEX closeout. The MAST and GALEX teams have accelerated their efforts to identify remaining data, catalogs and documentation to be archived at MAST.
MAST has cross-matched all GALEX sources in this catalog with the with the Sloan Digital Sky Survey DR7 catalog. The cross-match is available in CasJobs. There is a tutorial for this linked from the CasJobs site. In the future cross-matches between GALEX catalog and Guide Star Catalog 2 and the Two Micron All Sky Survey wil become available. As always watch the News corner of the GALEX home page for the announcement.
Hubble Treasury and Multi-Cycle Treasury programs provide an opportunity for the community to address high-impact scientific questions requiring observing time on a scale not easily accommodated by the standard time allocation process. Multi-Cycle Treasury programs have no proprietary period, and the three programs launched with Cycle 18 are being released as HLSPs to the community via the HLSP page in MAST.
For a more detailed description of each of the three Cycle 18 Multi-Cycle Treasury programs, please look for the winter issue of the STScI newsletter.
MAST currently holds a rich variety of High Level Science Products( HLSP) from Hubble and other missions, including surveys, deep fields, and atlases (http://archive.stsci.edu/hlsp/). The community contributes HLSPs as fully processed images and spectra ready for scientific analysis.
We encourage both individuals and teams to archive their science-ready products at MAST. Not only does MAST offer a permanent home for both data and catalogs associated with all HLSPs, but it provides a permanent URL to facilitate references in publications. HLSPs are among the most downloaded products in MAST, second only to Hubble and GALEX data. In fact, our bibliographical statistics show that, of the 25 programs with the most associated papers, 72% are also associated with archived HLSPs, and more than half of the top 50 programs are associated with HLSPs.
MAST is pleased to announce the recent availability of the following HLSPs.
High-Level Science Products that are coming soon:
The Space Telescope European Co-ordinating Facility, a unique collaboration between the European Space Agency (ESA) and the European Southern Observatory, was officially closed on 31 December 2010 after 26 years of operations. The full text of the announcement can be found on the ESA website . MAST and STScI will miss the close and productive collaboration and partnership we have had with our European colleagues for the past 26 years and we salute the contributions they have made to the HST project.
ESA is maintaining the European copy of the archive, keeping the current archive in place for a few months. ESA plans to transition support to the European Space Astronomy Centre (ESAC) during 2011.
MAST requests user feedback on a regular basis. We ask our users for input on current and future features, on improvements they would like to see, or on enhancements that would make their experience more helpful when visiting the large collection of MAST sites.
In June 2010 MAST conducted a User Survey. We want to thank all of those who participated for their feedback. The results of the survey can be viewed a PDF file and MAST responses to some of the comments and questions that we received are available at http://archive.stsci.edu/surveyresults/2010/response2010.html.
On July 16, 2010, the MAST User Group (MUG) held its annual meeting at the Institute. The MUG provides an essential user perspective on archive operations and development, including assessments of the priorities for short- and long-term operational and scientific enhancements to MAST. The 2010 MUG report and the presentations made at the meeting by MAST staff members are available at the MAST MUG page.
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