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EUVECAT2: Help

EUVECAT2 - EUVE Second Source Catalog


Overview

This is the 2nd Catalog of EUV objects detected by the Extreme Ultraviolet Explorer (EUVE) and published by Bowyer et al. in 1996 (ApJS, 102, 129). The data include (i) all-sky survey detections from the initial 6-months scanner survey phase, (ii) additional scanner detections made later during specially programmed observations designed to fill in low-exposure sky areas of the initial survey, (iii) sources detected with deep-survey telescope observations along the ecliptic plane, (iv) objects detected by the scanner telescopes during targeted spectroscopy observations, and (v) other observations. Plausible optical, X-ray, radio, and/or UV identifications are available for about 65% of the EUV sources.

The EUVE all-sky survey detections (indicated by detect_mode = EASS in this catalog) comprise 514 detected EUV-emitting objects, the deep-survey detections (indicated by detect_mode = DS in this catalog) comprise 35 detected objects, and the sources detected during other phases of the mission (indicated by detect_mode = OTHER in this database) comprise 188 detected objects. Notice that 3 deep survey objects were also detected in the all-sky survey. Most of the sources detected in the other phases principally comprise those detected in deep exposures with the scanner telescopes as part of the Right Angle Program through December 24, 1994, or in long exposures with the deep survey instrument. Because these latter objects were observed with a variety of instruments and exposure strategies, the flux limits and detection thresholds vary over a wide range, and the Bowyer et al. reference should be consulted for more details.

Some of the EUV sources have alternative cross-identifications at other wavelengths suggested for them. Notice that, in such cases, we have followed the original catalog and listed separate entries for each alternate identification. For example, the EUV-emitting object EUVE J1147+202 is listed twice, once with the suggested ID of DQ Leo, and a second time with the suggested ID of BD +21 2357. Thus, there are 801 entries in this database corresponding to 737 unique EUV sources.


Catalog Bibcode

1996ApJS..102..129B

References

This database is based on electronic versions of Tables 1, 2, and 3 of `The Second EUVE Source Catalog' that was published by

Bowyer, S., Lampton, M., Lewis, J., Wu, X., Jelinsky, P., Lieu, R., and Malina, R.F. 1996, ApJS, 102, 129.

The files were provided to the HEASARC by the Center for EUV Astrophysics (CEA), Berkeley, California.


Parameters

Name
An EUVE catalog designation that contains the epoch J2000 right ascension and declination.

RA
The best-fit RA for the detected EUV source: judging from the identified sources, the positions of the EUV sources are within 1 arcmin of the actual source position in nearly all cases.

Dec
The best-fit declination for the detected EUV source: judging from the identified sources, the positions of the EUV sources are within 1 arcmin of the actual source position in nearly all cases.

LII
The galactic longitude.

BII
The galactic latitude.

Rate_100a
The mean count rate in the 100A Lexan/boron band in counts/ksec. We have not explicitly differentiated DS 100A count rates from non-DS 100A count rates in the present database, notice.

Rate_100a_Error
The one-sigma error in the mean count rate in the 100A Lexan/boron band in counts/ksec. We have set the value of the error to 999 for those EUV sources for which the count rate may be affected by a possible UV leak.

Rate_200a
The mean count rate in the 200A aluminum/carbon band in counts/ksec. We have not explicitly differentiated DS 200A count rates from non-DS 200A count rates in the present database, notice.

Rate_200a_Error
The one-sigma error in the mean count rate in the 200A aluminum/carbon band in counts/ksec. We have set the value of the error to 999 for those EUV sources for which the count rate may be affected by a possible UV leak.

Rate_400a
The mean count rate in the 400A multicomponent-filter band in counts/ksec.

Rate_400a_Error
The one-sigma error in the mean count rate in the 400A multicomponent-filter band in counts/ksec.

Rate_600a
The mean count rate in the 600A tin band in counts/ksec.

Rate_600a_Error
The one-sigma error in the mean count rate in the 600A tin band in counts/ksec.

Detect_Mode
This indicates in which mode the EUV source was detected:

      EASS means the source was detected in the EUVE All-Sky Survey and is
      listed in Table 1 of Bowyer et al. 1996.

      DS means the source was detected in the Deep Survey and is listed in
      Table 2 of Bowyer et al. 1996.

      OTHER means the source was detected in one of the other observing modes
      and is listed in Table 3 of Bowyer et al. 1996.
  

Q
Indication of Level of Confidence of Source Detection or Cross-Identification

ID_Name_1
Name of proposed counterpart of EUV source. This is set to NO_ID if there is no proposed counterpart.

ID_Name_2
Alternate name of proposed counterpart of EUV source.

Spect_Type
The spectral type or general classification of the proposed counterpart.

Vmag
The visual magnitude of the proposed counterpart.

Offset
Angular Separation of the EUVE Source and the Proposed Counterpart

Comments
Explanation of Comments:

  1E = first Einstein survey (Giacconi et al. 1979)
  4U = fourth Uhuru catalog (Forman et al. 1978)
  AF = High Galactic Latitude Planetary Nebulae (Fruscione et al. 1995)
  AF2 = X-Ray Selected EUV Galaxies (Fruscione 1995)
  DK = D. Kilkenny  M. Mathioudakis (1995 private communication)
  HM = All-sky Survey (Marshall et al. 1995)
  JD = Hot White Dwarfs in the LISM (Dupuis et al. 1995)
  JE = Millisecond Pulsar J0437-4715 (Edelstein et al. 1995)
  JF = Middle Aged Pulsar PSR 0656+14 (Finley et al. 1994)
  JL = Transient/Flaring EUV Sources (Lewis et al. 1995)
  KM = First Year of EUVE RAP (McDonald et al. 1994)
  LTT = Luyten 1957, 1961
  MM = Activity Versus Rotation (Mathioudakis et al. 1995)
  NC = Optical ID of EUV Sources (Craig et al. 1995)
  NC2 = N. Craig (1995 private communication)
  RE = Rosat WFC Catalog (Pounds et al. 1993)
  RF = EUV Emission from Neutron Stars (Foster et al. 1995)
  RG =Field of EUVE J1027+323 (Genova et al. 1995)
  RL = EUV Emission of Active Galactic Nuclei (Lieu et al. 1995)
  SV = (Vennes et al. 1995)
  TD1 = TD1 UV survey (Carnochan  Wilson 1983)
  No ID = No identification proposed
  

Class
BROWSE classification type. The classification is based on the Spect_Type parameter.


Contact Person

Questions regarding the EUVECAT2 database table can be addressed to the HEASARC User Hotline.
If you have any problems, please consult the help page or mail ledas-help@star.le.ac.uk
 
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