J/MNRAS/408/2261 Compact steep spectrum new sample (Kunert-Bajraszewska+, 2010)
A survey of low-luminosity compact sources and its implication for the evolution
of radio-loud active galactic nuclei. I. Radio data.
Kunert-Bajraszewska M., Gawronski M.P., Labiano A., Siemiginowska A.
<Mon. Not. R. Astron. Soc., 408, 2261-2278 (2010)>
=2010MNRAS.408.2261K 2010MNRAS.408.2261K
ADC_Keywords: Radio sources ; Active gal. nuclei ; QSOs
Keywords: galaxies: active - galaxies: evolution
Abstract:
We present a new sample of compact steep spectrum (CSS) sources with
radio luminosity below 1026W/Hz at 1.4GHz; these are called
low-luminosity compact (LLC) objects. The sources have been selected
from the Faint Images of the Radio Sky at Twenty-cm (FIRST) survey and
observed with the multi-element radio linked interferometer network
(MERLIN) at the L and C bands. The main criterion used for selection
was the luminosity of the objects, and approximately one-third of the
CSS sources from the new sample have a value of radio luminosity
comparable to Fanaroff-Riley type 1 sources (FR Is). About 80 per cent
of the sources have been resolved and about 30 per cent have weak
extended emission and disturbed structures when compared with the
observations of higher-luminosity CSS sources. We have studied the
correlation between radio power and linear size, and the redshift with
a larger sample that also included published samples of compact
objects and large-scale FR IIs and FR Is.
Description:
Using the final release of FIRST, combined with the Green Bank 6-cm
(GB6) survey at 4.85GHz, we looked for unresolved, isolated sources,
that is, more compact than the FIRST beam (5.4-arcsec), and surrounded
by an empty field (we adopted 1-arcmin as the radius of that field).
We required that the redshifts of the objects identified with radio
sources were known, and we extracted these from the National
Aeronautics and Space Administration (NASA)/Infrared Processing and
Analysis Center (IPAC) Extragalactic Data base (NED) and the Sloan
Digital Sky Survey (SDSS).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 83 44 Basic parameters of the 44 target sources
table2.dat 22 74 Flux densities of the principal components of the
sources from the 1.6- and 5-GHz MERLIN images
tablea1.dat 73 124 Combined sample of CSS sources
--------------------------------------------------------------------------------
See also:
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
VIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)
VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012)
J/A+A/369/380 : CSS/GPS radio sources VLA observations (Fanti+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Source Source name (HHMM+DDd, B1950)
10- 11 I2 h RAh FIRST Right ascension (J2000)
13- 14 I2 min RAm FIRST Right ascension (J2000)
16- 20 F5.2 s RAs FIRST Right ascension (J2000)
22 A1 --- DE- FIRST Declination sign (J2000)
23- 24 I2 deg DEd FIRST Declination (J2000)
26- 27 I2 arcmin DEm FIRST Declination (J2000)
29- 33 F5.2 arcsec DEs FIRST Declination (J2000)
35- 36 A2 --- ID Optical identification (1)
38- 42 F5.3 --- z Redshift
43 A1 --- f_z [bcd] Uncertain redshift (2)
45- 49 F5.3 Jy S1.4 FIRST total flux density at 1.4GHz
51- 55 F5.2 [W/H] logL1.4 Radio luminosity at 1.4GHz
57- 61 F5.3 Jy S4.85 GB6 Total flux density at 4.85GHz
63- 67 F5.2 [W/H] logL4.85 Radio luminosity at 4.85GHz
69- 72 F4.2 --- alpha Spectral index α (3)
74- 79 F6.3 kpc LLS LLS Largest linear size in kpc/h units (4)
81- 82 A2 --- Type Radio morphology (5)
83 A1 --- f_Type [ae] Uncertain type (2)
--------------------------------------------------------------------------------
Note (1): Optical identification as follows:
G = galaxy
Q = quasar
q = star-like object
Gp = galaxy pair
Qb = binary quasar
Note (2): Notes as follows:
a = The most uncertain classification
b = The uncertain redshift probably belongs to a random foreground galaxy
c = The photometric redshift is taken from the literature or the SDSS.
d = The spectroscopic redshift is very uncertain because of the poor
quality of the spectrum
e = 1641+320 will be described in a separate paper
Note (3): S(ν)∝ν-α, index calculated using the
flux densities S1.4 and S4.85.
Note (4): calculated based on the largest angular size measurements in the
1.4-GHz MERLIN image, in most cases as a separation between the outermost
component peaks, otherwise measured in the image contour plot (in the case
of single sources, the linear size means the upper limit estimated using the
deconvolved component major axis angular size from the L-band MERLIN image).
The cosmology is Ho=100km/s/Mpc, q0=0.5.
Note (5): radio morphology based on the available radio images, a simple
classification in agreement with that of Kunert-Bajraszewska & Thomasson
(2009AN....330..210K 2009AN....330..210K), with a more detailed description in Section 2.
The labels are:
S = single means unresolved or slightly resolved in the available radio
image
Cj = core-jet
D = double-lobed
O = other, more complex structures
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Source Source name (HHMM+DDd, B1950)
10- 11 A2 --- Comp Component
12 A1 --- n_Comp [b] b: sum of the visible components
14- 16 I3 mJy S1.6 ?=- Flux density at 1.6GHz
17 A1 --- n_S1.6 [a] a: the whole source
19- 22 F4.1 mJy S5 ?=- Flux density at 5GHz
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Ref [FM] Code for reference data (1)
3- 10 A8 --- Source Source name (HHMM+DDd, B1950)
12- 13 I2 h RAh FIRST Right ascension (J2000)
15- 16 I2 min RAm FIRST Right ascension (J2000)
18- 21 F4.1 s RAs FIRST Right ascension (J2000)
23 A1 --- DE- FIRST Declination sign (J2000)
24- 25 I2 deg DEd FIRST Declination (J2000)
27- 28 I2 arcmin DEm FIRST Declination (J2000)
30- 31 I2 arcsec DEs FIRST Declination (J2000)
33- 37 F5.3 --- z ?=1 Redshift (2)
38 A1 --- n_z [ab] Note on redshift (3)
40- 44 F5.3 Jy S1.4 FIRST total flux density at 1.4GHz
46- 50 F5.2 [W/Hz] logL1.4 Radio luminosity at 1.4GHz
52- 56 F5.3 Jy S4.85 GB6 Total flux density at 4.85GHz
58- 62 F5.2 [W/Hz] logL4.85 Radio luminosity at 4.85GHz
64- 67 F4.2 arcsec LAS Largest angular size
69- 73 F5.2 kpc LLS LLS Largest linear size in kpc/h units (4)
--------------------------------------------------------------------------------
Note (1): The data are taken from:
F = Fanti et al. (2001, Cat. J/A+A/369/380) sample
M = Marecki et al. (2003PASA...20...42M 2003PASA...20...42M) sample.
There is a small overlap between these two samples, which is why the
overlapping sources are included only in the first part of the table (F).
Note (2): we adopt z=1.0 for sources with unknown redshift.
Note (3): Note on redshift as follows:
a = photometric redshift taken from the literature or from the SDSS
b = this is a new value from the SDSS
Note (4): Largest linear size calculated based on the largest angular size
measurements on resolved structures taken from the literature.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 06-Aug-2013