Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..311s&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 311-312 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
1
Astronomical Observatories, Bl Lacertae Objects, Color-Color Diagram, Quasars, Seyfert Galaxies, Sky Surveys (Astronomy), X Ray Astronomy, X Ray Sources, X Ray Spectroscopy, Charge Coupled Devices, Optical Polarization, Polarimeters, Polarimetry, Position Errors, Very Large Array (Vla)
Scientific paper
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.
Elvis Martin
Granados Arno
Impey Chris
Perlman Eric
Schachter Jonathan
No associations
LandOfFree
Finding the rarest objects in the universe: A new, efficient method for discovering BL Lacertae objects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Finding the rarest objects in the universe: A new, efficient method for discovering BL Lacertae objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Finding the rarest objects in the universe: A new, efficient method for discovering BL Lacertae objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1260217