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.
<Astron. Astrophys. Suppl. Ser. 134, 221 (1999)>
=1999A&AS..134..221B 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
5x10-14erg/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".
File Summary:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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Note (1): i: source lies in the inner 3° 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
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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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
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Acknowledgements: Wolfgang Brinkmann
(End) Patricia Bauer [CDS] 01-Mar-1999