Additionally, this database includes the sources derived from the First EUVE Source Catalog Supplementary list, which were a part of the Bright Source List (BSL) but not formally included in the First EUVE Source Catalog (FESC) because they did not meet the criteria for inclusion.
Two distinct surveys, the All-Sky and Deep Surveys, were conducted by the four EUVE telescopes during the first six months of the mission, as well as during short periods of "gap filling" during the first six months of the Guest Observer (GO) program.
The All-Sky Survey was conducted by three scanning telescopes ("scanners") with four distinct filters (Lex/B, Al/C, Ti/Sb/Al or "Dagwood", and Sn/SiO) covering the wavelength region 58-740 Å. During the All-Sky Survey phase, the scanning telescopes mapped approximately 97% of the entire sky with exposure times of greater than 20 seconds along the ecliptic and much higher at the poles. Concurrently, the Deep Survey (DS) telescope conducted a much more sensitive survey of a 2 Degrees x 180 Degrees band along the ecliptic in two filters (Lex/B and Al/C) covering the wavelength region 67-364.
Name Name of the EUVE source. The adopted format is EUVE_Jhhmm[+-]dd.d. Note that the format used in this database is slightly different from that used in the published version of the catalog, where the declination in the EUVE name is multiplied by ten. VMAG Photographic magnitude. RA The right ascension of the object. Dec The declination of the object. LII The galactic latitude of the object. BII The galactic longitude of the object. LEX Countrates of the EUV source in Lexan/B filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. LEX_Err Statistical uncertainty of the EUVE sources in Lexan/B filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. ALC Countrates of the EUV source in Al/Ti/C filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. ALC_Err Statistical uncertainty of the EUVE sources in Al/Ti/C filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. DAG Countrates of the EUV source in Ti/Sb/Al filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. DAG_Err Statistical uncertainty of the EUVE sources in Ti/Sb/Al filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. TIN Countrates of the EUV source in Sn/SiO filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. TIN_Err Statistical uncertainty of the EUVE sources in Sn/SiO filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. DSL Countrates of the EUV source in Deep Survey Lexan/B filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. DSL_Err Statistical uncertainty of the EUVE sources in Deep Survey Lexan/B filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. DSA Countrates of the EUV source in Deep Survey Al/C filters. The units are in counts per second. The NULL value means the source countrate was less than three times the measurement uncertainty. DSA_Err Statistical uncertainty of the EUVE sources in Deep Survey Al/C filters. The units are in counts per second. A NULL value appears when no countrate is given for that filter. Qual A qualitative measure of the quality of the match between the EUVE source and the possible optical counterpart. 1 means a probable match, 2 means a possible match. A quality of NULL means that either there is no known optical counterpart, or that the EUVE source is identified as a possible UV leak. ID_1 Possible optical counterpart identification of the EUV source as taken from internal catalogs, SIMBAD database search and/or communication with the EUVE Optical Identification group. Possible counterparts all lie within two arcminutes of the calculated source position. The notation "NO ID" was used for unidentified sources. ID_2 Another possible optical counterpart identification of the EUV source as taken from internal catalogs, The notation "NO ID" was used for unidentified sources. Not available from the Supplementary list. SPECT_TYPE The spectral type (if known) of the possible optical counterpart for the EUVE source. Most of the notations are standard usage except "CSPN" refers to the central star of a planetary nebula and "Puls" is a pulsar. An empty field indicates no known spectral type. SEP The separation between EUVE source and its optical counterpart, measured in arcseconds. A value of NULL indicates there was no optical counterpart found, and hence no separation could be computed. Comments Miscellaneous comments. The key is: ------------------------------------------------------------------------------- RE: source is also in the ROSAT WFC catalog 4U: source is in the 4th Uhuru catalog TD1: source seen in the TD1 survey 1E: source seen in the 1st Einstein survey LTT: Luyten 1957, Luyten 1961 ------------------------------------------------------------------------------- In three cases, sources seen in the All-Sky Survey were also seen in the Deep Survey. For these sources, the separation given in the sep field refers only to the All-Sky separation. Each of these three sources have been assigned a unique comment, which gives the separation as measured through the Deep Survey telescope: ------------------------------------------------------------------------------- SEP1: sep=71 arcseconds SEP2: sep=137 arcseconds SEP3: sep=108 arcseconds ------------------------------------------------------------------------------- Supplements A Flag determining the difference between sources culled from the First EUVE Source Catalog (N), and those derived from the First EUVE Source Catalog Supplementary List (Y). Class BROWSE classification type. The classification is based on the `Type` parameter, if one is available.