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Detailed Description of VII/274 :
The Roma BZCAT - 5th edition (Massaro+, 2015)

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Note : this is the description file of the original catalog. This HTML page corresponds well to the original description, but some minor changes in the format may have been introduced in the FITS output files in order to allow for arithmetic operations on quantities such as coordinates and times. h:m:s and d:m:s units are normally converted into degrees, and YYYY-MM-DD into julian days.
Similarly, some slight changes may have been introduced in the units; the value given in the HTML files supersedes the value indicated in the ReadMe file for this catalogue.
VII/274             The Roma BZCAT - 5th edition                (Massaro+, 2015)
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The 5th edition of the Roma-BZCAT.
     Massaro E., Giommi P., Leto C., Marchegiani P., Maselli A., Perri M.,
     Piranomonte S., Sclavi S.
     <Astrophys. Space Sci., 357, 75 (2015)>
     =2015Ap&SS.357...75M
     =2016yCat.7274....0M
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ADC_Keywords: QSOs ; BL Lac objects ; Galaxy catalogs ; Redshifts ; Photometry

Keywords: BL Lacertae objects: general - galaxies: quasars: general - catalogs


Abstract:
    The Roma-BZCAT is now at the 5th Edition which contains coordinates
    and multi-frequency data of 3561 sources, about 30% more than in the
    1st edition, either confirmed blazars or exhibiting characteristics
    close to this type of sources. With respect to the previous editions,
    this new edition has relevant changes in the sources' classification
    and has a new format for the notes in the tables. We emphasize that
    all the sources in the Roma-BZCAT have a detection in the radio
    band. Moreover, a complete spectroscopic information is published
    and could be accessed by us for all of them, with the exception of BL
    Lac candidates. Consequently, peculiar sources as the so called
    "radio quiet BL Lacs", which are reported in some other
    catalogues, are not included here because of possible contamination
    with hot stars and other extragalactic objects.

Description:
    In the 5th Edition we use similar denomination of
    blazars adopted in the previous editions. Each blazar
    is identified by a code, with 5BZ for all blazars, a fourth
    letter that specifies the type (B, G, Q or U), followed by the
    truncated equatorial coordinates (J2000). We introduced the edition
    number before the letters BZ to avoid possible confusion due to the
    fact that several sources changed their old names because of the new
    adopted classification.

    The codes are defined in the "Note (G1)" below.

    The 5th edition contains 1151 BZB sources, 92 of which are reported as
    candidates because we could not find their optical spectra in the
    literature, 1909 BZQ sources, 274 BZG sources and 227 BZU objects

File Summary:

FileName Lrecl Records Explanations
× 80 . This file × ReadMe 80 . This file × bzcat5.dat 133 3561 The Roma BZCAT - 5th edition
See also: J/A+A/495/691 : Multifrequency catalogue of blazars, Roma-BZCAT (Massaro+ 2009) http://www.asdc.asi.it/bzcat : BZCAT Home Page Byte-by-byte Description of file: bzcat5.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Seq Sequential number 6- 20 A15 --- Name Source name (based on J2000 position), 5BZA JHHMM+DDMM (G1) 22- 23 I2 h RAh Right ascension (J2000.0) 25- 26 I2 min RAm Right ascension (J2000.0) 28- 32 F5.2 s RAs Right ascension (J2000.0) 34 A1 --- DE- Declination sign (J2000.0) 35- 36 I2 deg DEd Declination (J2000.0) 38- 39 I2 arcmin DEm Declination (J2000.0) 41- 45 F5.2 arcsec DEs Declination (J2000.0) 47- 52 F6.2 deg GLON Galactic longitude 54- 59 F6.2 deg GLAT Galactic latitude 61- 65 F5.3 --- z Redshift 66 A1 --- u_z [?] uncertainty flag on z 68- 71 F4.1 mag Rmag ?=0 R magnitude 73- 96 A24 --- Class Source classification 98-105 F8.1 mJy FR ?=0 Flux density at 1.4/0.843GHz 107-111 I5 mJy F143 ?=0 Flux density at 143GHz 113-118 F6.2 fW/m2 FX ?=0 X-ray flux 0.1-2.4keV 120-126 E7.3 cm2/s FF ?=0 Fermi flux1-100GeV (in ph/cm2/s) 128-133 F6.3 --- aro Spectral index radio-optical
Global Notes: Note (G1): The classifications are: 5BZB = BL Lac objects, used for AGNs with a featureless optical spectrum, or having only absorption lines of galaxian origin and weak and narrow emission lines; 5BZG = sources, usually reported as BL Lac objects in the literature, but having a spectral energy distribution (SED) with a significant dominance of the galaxian emission over the nuclear one 5BZQ = Flat Spectrum Radio Quasars, with an optical spectrum showing broad emission lines and dominant blazar characteristics; BZU = blazars of Uncertain type, adopted for a small number of sources having peculiar characteristics but also exhibiting blazar activity: for instance, occasional presence/absence of broad spectral lines or other features, transition objects between a radio galaxy and a BL Lac, galaxies hosting a low luminosity blazar Nucleus, etc.
History: Copied at http://www.asdc.asi.it/bzcat ================================================================================ (End) Patricia Vannier [CDS] 11-Feb-2016