EUVERAP3 - EUVE Right Angle Program, 3rd Catalog

Overview

The Third Extreme Ultraviolet Explorer (EUVE) Right Angle Program (RAP) Catalog contains information on the detection of 76 extreme ultraviolet (EUV) sources, of which 63 are new detections, using the EUVE's RAP data. This catalog concentrates on observations made in the last years of the RAP, 1999 and 2000, with a sky coverage of 7% of the sky. The EUVE RAP used the all-sky survey telescopes (also known as "scanners"), which were mounted at right angles to the Deep Survey and Spectrometer instruments, to obtain photometric data in four wavelength bands centered at 100 Angstroms (Lexan/Boron or "Lexan"), 200 A (Al/Ti/C or "Al/C"), 400 A (Ti/Sb/Al or "Dagwood"), and 600 A (Sn/SiO or "Tin"). The EUVE RAP3 Catalog contains source count rates and probable source identifications from the available catalogs and literature. The source distribution is similar to previous EUV catalogs with 5 (8%) early-type stars, 23 (37%) late-type stars, 1 (2%) white dwarf, 1 (2%) cataclysmic variable, 4 (6%) extragalactic objects, 22 (35%) with no firm classification, and 7 (11%) with no optical identification.

This final RAP Catalog, combined with the EUVE All-Sky Survey, the Lampton et al. (1997, ApJS, 108, 545) Faint EUV Source List, and previous RAP Catalogs, brings the total number of EUV sources to nearly 1200.

Catalog Bibcode

2002AJ....124.3478C

References

The Third Extreme Ultraviolet Explorer Right Angle Program Catalog:
     The Last Years
     Christian, D.J.
    <Astron. J. 124, 3478 (2002)>
    =2002AJ....124.3478C

Provenance

This table was created by the HEASARC in September 2011 based on an ASCII version of Table 1 from the reference paper which was obtained from the AJ web site.

Description

The Guest Observer (GO) phase of the EUVE mission accumulated pointed observations of over 400 unique sources in the period after the initial phase of the all-sky survey was completed (1993 January) through early 2001. The GO pointed observations primarily used the EUV Deep Survey and Spectrometer (DS/S) telescope. However, pseudo-serendipitous observations continued through this phase by using the survey telescopes, which were mounted perpendicular to the DS/S in what became known as the Right Angle Program (RAP). The source detections from the first year of the RAP program were presented in a paper by McDonald et al. (1994, AJ, 108, 1843), the First EUVE RAP Catalog, which covered observations from january 1993 through January 1994. (These data, published in Table 2 of that reference, are not available in the HEASARC Browse system). Table 3 of the Second EUVE All-Sky Catalog (Bowyer et al. 1996, ApJS, 102, 129, available in the HEASARC Browse system as the EUVECAT2 database table) includes miscellaneous EUVE detections and the EUVE RAP results though 1994 December; the selection criteria in Table 3 varied, and for this reason the authors of the Second EUVE RAP Catalog (Christian et al. 1999, AJ, 117, 2466, available as the HEASARC Browse EUVERAP2 table) included RAP results from 1994 January through November 1998. As noted above, the results from the final 2 years (1999 and 2000) of the RAP program are included in this present table.

One of the key advantages of RAP observations over the all-sky survey was that the exposure times for each field observed on the sky were generally much longer because they were dictated by the DS/S pointings. This catalog concentrates on RAP data from 145 individual scanner and Deep Survey pointings take in 1999 and 2000, and covers >~ 7% of the sky, with an average exposure time of 53 ks which is almost 20 times that of the all-sky survey. This catalog also includes a small number of scanner and DS pointings that were not included in the first two RAP catalogs.

HEASARC Implementation

Ten of the EUV sources have two alternative source identifications (often, but not always, at other wavelengths) suggested for them in this catalog. Notice that, in such cases, the HEASARC has followed the structure of the original catalog and the CDS tables derived from it, and lists separate entries for the alternative identifications. Thus, there are 86 entries in this database corresponding to 76 listed EUV sources.

Note

The source named EUVE J0613-23.9B is approximately 2.5 arcmin from the GO target EUVE J0613-23.9 (HD 43162).

Parameters

Name
The name of the EUVE source based on its position in J2000.0 equatorial coordinates.

RA
The Right Ascension of the EUVE source in the selected equinox. This was given in J2000.0 equatorial coordinates with a precision of 0.1 seconds of time in the original table.

Dec
The Declination of the EUVE source in the selected equinox. This was given in J2000.0 equatorial coordinates with a precision of 0.1 arcseconds in the original table.

LII
The Galactic Longitude of the EUVE source.

BII
The Galactic Latitude of the EUVE source.

Exposure
The effective exposure time, in seconds (s).

Le_Count_Rate
The count rate, in ct/ks, in the Lexan band. In cases of weak detections where the 90% confidence lower limit is consistent with zero, this field is left blank and the 90% confidence upper limit is quoted for the le_count_rate_error parameter value.

Le_Count_Rate_Error
The rms uncertainty in the Lexan band count rate, in ct/ks. In cases of weak detections where the 90% confidence lower limit is consistent with zero, the le_count_rate parameter value field is left blank and the 90% confidence upper limit is quoted for the le_count_rate_error parameter value.

Al_Count_Rate
The count rate, in ct/ks, in the Al/C band. In cases of weak detections where the 90% confidence lower limit is consistent with zero, this field is left blank and the 90% confidence upper limit is quoted for the al_count_rate_error parameter value.

Al_Count_Rate_Error
The rms uncertainty in the count rate in the Al/C band, in ct/ks. In cases of weak detections where the 90% confidence lower limit is consistent with zero, the al_count_rate parameter value field is left blank and the 90% confidence upper limit is quoted for the al_count_rate_error parameter value.

Qflag
This is a coded quality flag (the same as used for the 2nd EUVE RAP Catalog) which has the following possible values:

              1: indicates a likely identification with supporting evidence as a
                  previously identified EUV source
              2: indicates that although the detection is statistically
                  significant, there was no other supporting evidence
              H: indicated no identification was found
              U: indicates that (1) the source has a strong ultraviolet
                 continuum, and the reported emission may possibly be due
                 to  the so-called  "ultraviolet leak"

ID_1
A plausible (optical, radio, EUV, X-ray, etc.) identification for the EUVE RAP source, or 'No ID' if there is no such identification. Some of the sources have two alternative identifications suggested for them in this catalog. Notice that, in such cases, the HEASARC has followed the original catalog and listed separate entries for each alternative identification.

ID_2
An alternate name for the proposed counterpart to the EUVE RAP source.

Type
The spectral type (for normal stars and white dwarfs) or object class (for non-stellar sources or peculiar or unidentified sources) for the proposed counterpart to the EUVE RAP source, obtained by the catalog authors from SIMBAD, NED and/or the literature where available. In addition to the spectral types, and 'Seyfert 1', 'Star' and 'Galaxy' types, the following abbreviations for object types were used:

           Object Type      Description

              BL Lac        BL Lac object
              CV            cataclysmic variable
              IR            infrared source
              X-ray         X-ray source

Vmag
The V magnitude (usually) for the proposed counterpart to the EUVE RAP source, obtained by the catalog authors from SIMBAD, NED and/or the literature where available.

Offset
The angular separation between the measured EUVE position and the identified source's position, in arcseconds.

Comments
Comments as discussed in section 4 of the published paper, and/or codes for selected references in the literature:

               DS = source was detected in the Deep Survey
               FB = source was obstructed by a filter bar
               OA = source was off-axis

  Catalog or literature reference cited:

             2EU: EUVE second catalog, Bowyer et al., 1996, Cat. <II/203>
            1RXS: ROSAT All Sky Survey, Voges et al., 1996, Cat. <IX/10>
            1WGA: White et al. 1994, IAU Circular 6100 & 2000, WGA Catalog
             2RE: ROSAT Second All Sky Survey, Pye et al, 1995,
                   Cat. <J/MNRAS/274/1165>
            1WGA: White et al., 1995, ROSAT PSPC catalog, Cat. <IX/31>
             1ES: First Einstein Slew Survey, Elvis et al., 1992ApJS...80..257E
             B89: Beuermann et al., 1989A&A...219L...7B
             BSL: Malina et al., 1994AJ....107..751M
              2E: Second Einstein Soft X-ray Catalog, McDowell 1994, Cat. <IX/13>
             EXO: EXOSAT source
             L97: Lampton et al., 1997, Catalog of fainter EUVE detections,
                   Cat. <II/203>
             H98: Halpern et al., 1998PASP..110.1394H
             J95: Jefferies et al., 1995MNRAS.267..387J
             J98: Jensen et al., 1998AJ....116..414J
             K84: Kilkenny, 1984MNRAS.211..969K
             RBS: Schwope et al. 2000AN....321....1S
             TD1: Thompson et al 1978, TD-1 Catalog of Stellar Ultraviolet Fluxes

Class
The HEASARC Browse object classification, based on the value of the type parameter (q.v.).

Contact Person

Questions regarding the EUVERAP3 database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:27:08 EDT