J/A+AS/134/221 Radio-loud ROSAT sources near NEP (Brinkmann+, 1999) ================================================================================ Radio-loud ROSAT sources near the North Ecliptic Pole. Brinkmann W., Chester M., Kollgaard R., Feigelson E., Voges W., Hertz P. =1999A&AS..134..221B ================================================================================ ADC_Keywords: Radio sources ; X-ray sources Keywords: galaxies: active - clusters: general - quasars: general - X-rays: general - radio continuum: galaxies Abstract: 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^-14^erg/s/cm^2^ 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". File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 107 28 Compact X-ray/Radio Sources in the North Ecliptic Pole (NEP) table2.dat 107 46 Extended X-ray/Radio Sources in the NEP table3.dat 107 32 Possible additional X-ray/Radio Sources in the NEP notes.dat 80 218 Individual notes tables.tex 184 452 LaTeX version of the tables -------------------------------------------------------------------------------- See also: J/ApJS/93/145 : Radio survey around North Ecliptic Pole (Kollgaard+, 1994) J/MNRAS/276/614 : Radio-optical 151MHz survey of the N. Ecl. Cap (Lacy+ 1995) Byte-by-byte Description of file: table?.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 A11 --- VLA-NEP VLA source designation (Radio data) 12 A1 --- m_VLA-NEP Multiplicity index on VLA-NEP 14- 15 I2 h RAh Radio right ascension (J2000) 17- 18 I2 min RAm Radio right ascension (J2000) 20- 23 F4.1 s RAs Radio right ascension (J2000) 25 A1 --- DE- Radio declination sign (J2000) 26- 27 I2 deg DEd Radio declination (J2000) 29- 30 I2 arcmin DEm Radio declination (J2000) 32- 35 F4.1 arcsec DEs Radio declination (J2000) 37- 42 F6.1 mJy S1.5GHz ? Integrated flux density at 1.5GHz (20cm) 44- 47 F4.1 mJy e_S1.5GHz ? rms uncertainty on S1.5GHz 49- 68 A20 ---- ROSAT RXS designation 70- 71 I2 arcsec Delta Positional offset between the VLA and X-ray source 73 A1 --- Loc [io] Localisation (1) 75- 77 I3 --- MaxLi Likelihood value from the EXSAS processing 79- 84 F6.1 10-14mW/m2 FX 0.1-2.4keV X-ray flux 86- 89 F4.1 10-14mW/m2 e_FX rms uncertainty on FX 91- 92 A2 --- Class Optical morphology classification (2) 94- 95 I2 arcsec oRA ? Optical minus radio positional offset 97- 98 I2 arcsec oDE ? Optical minus radio positional offset 100 A1 --- l_Bmag [~>] Limit flag on Bmag 101-104 F4.1 mag Bmag ? Approximate B magnitude 105 A1 --- n_Bmag Note on Bmag (3) 107 A1 --- Note [*] Individual note detailed in notes.dat -------------------------------------------------------------------------------- Note (1): i: source lies in the inner 3{deg} of the RASS NEP field o: source lies outer region of the RASS NEP field Note (2): E: empty field F: too faint to classify G: galaxy Gp: galaxy group S: stellar Note (3): The B magnitudes are derived as follow: A: APM object catalog b: COSMOS object catalog calibrated to APM magnitudes c: COSMOS object catalog -------------------------------------------------------------------------------- Byte-by-byte Description of file: notes.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 11 A11 --- VLA-NEP VLA source designation 12 A1 --- m_VLA-NEP Multiplicity index on VLA-NEP 14- 80 A67 --- Note Text of the note -------------------------------------------------------------------------------- Acknowledgements: Wolfgang Brinkmann ================================================================================ (End) Patricia Bauer [CDS] 01-Mar-1999