SIMBAD references

1999A&AS..134..221B - Astron. Astrophys., Suppl. Ser., 134, 221-240 (1999/January-2)

Radio-loud ROSAT sources near the North Ecliptic Pole.

BRINKMANN W., CHESTER M., KOLLGAARD R., FEIGELSON E., VOGES W. and HERTZ P.

Abstract (from CDS):

A deep and large-area survey of the North Ecliptic Pole region was made with the ROSAT All-Sky Survey and the VLA to elucidate the population of radio-loud extragalactic objects. A region of 29.3 square degrees was surveyed with sensitivities around 5x10–14erg/s/cm2 in the soft X-ray band and 1mJy at 1.5GHz. Optical counterparts were sought on digitized Schmidt plates from POSS-I and II. Seventy-four reliable RASS-VLA sources were found. The sample is a heterogeneous mixture of Seyfert galaxies, quasars, BL Lac objects, galaxy clusters and groups containing a radio galaxy. Optical magnitudes range from B≃14 to B>22. Three results are noteworthy: (1) the bimodality in the ratio of radio to optical emission seen in optically- and X-ray-selected AGN samples is also evident in the ROSAT-VLA objects; (2) X-ray and radio selection is an effective method for locating poor galaxy clusters and groups; and (3) a considerable population of optically faint but X-ray/radio-bright objects is present. This last group may be either distant clusters with radio galaxies or ``red quasars".

Abstract Copyright:

Journal keyword(s): galaxies: active - clusters: general - quasars: general - X-rays: general - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+AS/134/221): table1.dat table2.dat table3.dat notes.dat tables.tex>

Simbad objects: 108

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