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Finding the rarest objects in the universe: a new, efficient method for discovering bl lacertae objects
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Perlman, Eric Granados, Arno Smith, Paul Stocke, John Schachter, Jonathan Urry, Meg Impey Sr., Chris Elvis, Martin |
| Copyright Year | 1993 |
| Description | We present a new, efficient method for discovering new BL Lac Objects based upon the results of the Einstein Extended Medium Sensitivity Survey (EMSS). We have found that all x-ray selected BL Lacs are radio emitters, and further, that in a 'color-color' diagram (radio/optical and optical/x-ray) the BL Lac Objects occupy an area distinct from both radio loud quasars and the radio quiet QSOs and Seyferts which dominate x-ray selected samples. After obtaining radio counterparts via VLA 'snapshot' observations of a large sample of unidentified x-ray sources, the list of candidates is reduced. These candidates then can be confirmed with optical spectroscopy and/or polarimetry. Since greater than 70 percent of these sources are expected to be BL Lacs, the optical observations are very efficient. We have tested this method using unidentified sources found in the Einstein Slew Survey. The 162 Slew Survey x-ray source positions were observed with the VLA in a mixed B/C configuration at 6 cm resulting in 60 detections within 1.5 position error circle radii. These x-ray/optical/radio sources were then plotted, and 40 BL Lac candidates were identified. To date, 10 candidates have been spectroscopically observed resulting in 10 new BL Lac objects! Radio flux, optical magnitude, and polarization statistics (obtained in white light with the Steward Observatory 2.3 m CCD polarimeter) for each are given. |
| File Size | 133960 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930017668 |
| Archival Resource Key | ark:/13960/t5z65fk19 |
| Language | English |
| Publisher Date | 1993-01-01 |
| Access Restriction | Open |
| Subject Keyword | Astrophysics Charge Coupled Devices Quasars Polarimeters Bl Lacertae Objects X Ray Spectroscopy Seyfert Galaxies Optical Polarization Astronomical Observatories Very Large Array Vla Color-color Diagram Sky Surveys Astronomy X Ray Astronomy Polarimetry Position Errors X Ray Sources Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
