Access to Astronomical Catalogues

← Click to display the menu
J/MNRAS/405/2062  AGN candidates from 2MASS/ROSAT catalogs (Kouzuma+, 2010)

Properties of near-infrared-selected AGN candidates with 2MASS/ROSAT catalogues. Kouzuma S., Yamaoka H. <Mon. Not. R. Astron. Soc., 405, 2062-2068 (2010)> =2010MNRAS.405.2062K
ADC_Keywords: Active gal. nuclei ; QSOs ; Radio sources ; Infrared sources Keywords: catalogs ; galaxies: active ; quasars: general Abstract: We report on the near-infrared-selected active galactic nuclei (AGN) candidates extracted from Two Micron All Sky Survey (2MASS)/ROSAT catalogues and discuss their properties. First, near-infrared counterparts of an X-ray source in ROSAT catalogues [namely bright source catalogue (BSC, Cat. IX/10) and faint source catalogue (FSC, Cat. IX/29)] were extracted by positional cross-identification of ≤30arcsec. As these counterparts would contain many mis-identifications, we further imposed near-infrared colour selection criteria and extracted reliable AGN candidates (BSC: 5273, FSC: 10071). Of the 5273 (10071) candidates in the BSC (FSC), 2053 (1008) are known AGNs. Near-infrared and X-ray properties of candidates show similar properties with known AGNs and are consistent with the previous studies. We also searched for counterparts in other wavelengths (i.e. optical, near-infrared and radio) and investigated properties in multiwavelength. No significant difference between known AGNs and unclassified sources could be seen. However, some unclassified sources in the FSC showed slightly different properties compared with known AGNs. Consequently, it is highly probable that we could extract reliable AGN candidates, though candidates in the FSC might be spurious. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file bsc_k.dat 134 2053 Known AGNs in the Rosat-BSC (Cat. IX/10) bsc_u.dat 134 3220 Unclassified sources (AGN candidates) in the BSC fsc_k.dat 134 1008 Known AGNs in the Rosat-FSC (Cat. IX/29) fsc_u.dat 134 9693 Unclassified sources (AGN candidates) in the FSC
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000) Byte-by-byte Description of file: bsc*.dat fsc*.dat
Bytes Format Units Label Explanations
1- 10 F10.6 deg RAdeg Right ascension (J2000) in 2MASS 12- 21 F10.6 deg DEdeg Declination (J2000) in 2MASS 23- 28 F6.3 mag Jmag 2MASS J selected default magnitude 30- 35 F6.3 mag Hmag 2MASS H selected default magnitude 37- 42 F6.3 mag Ksmag 2MASS Ks selected default magnitude 44- 52 F9.5 ct/s CRate Source count rate (1) 54- 62 F9.5 ct/s e_CRate ?=0 Error on CRate (1) 64- 74 E11.4 ct/s/arcmin2 bgCt ?=0 Background count rate (1) 76- 80 I5 s texp Exposure time 81- 82 A2 --- --- [.0] 84- 88 F5.2 --- HR1 [-1/1]? Hardness ratio 1 (2) 90- 94 F5.2 --- e_HR1 ? Error on HR1 (3) 96-100 F5.2 --- HR2 [-1/1]? Hardness ratio 2 (2) 102-106 F5.2 --- e_HR2 ? Error on HR2 (3) 108-110 I3 arcsec Extent Source extent, by which the source image exceeds the point spread function 112-120 F9.2 "YYMMDD" Obs.beg ? Start time of observation (FSC only) 122-130 F9.2 "YYMMDD" Obs.end ? End time of observation (FSC only) 133-134 I2 --- Rel ? Reliability of source detection (FSC data only)
Note (1): Countrates are vignetting corrected Note (2): The hardness ratios are defined by: HR1=(B-A)/(B+A), where A = count rate in PHA range 11-41 (∼0.1-0.4keV) B = count rate in PHA range 52-201 (∼0.5-2.0keV) HR2=(D-C)/(D+C), where C = count rate in PHA range 52-90 (∼0.5-0.9keV) D = count rate in PHA range 91-201 (∼0.9-2.0keV) (PHA = Pulse Height Amplitude) Note (3): The true mean error is probably bigger, and values larger than 9.99 are set to 9.99
Acknowledgements: S. Kouzuma, skouzuma(at)
(End) Patricia Vannier [CDS] 19-Apr-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service