J/A+A/466/481 Near-infrared survey around PKS 1343-601 (Schroeder+, 2007)
The highly obscured region around PKS 1343-601.
I. Galactic interstellar extinctions using DENIS galaxy colours.
Schroeder A.C., Mamon G.A., Kraan-Korteweg R.C., Woudt P.A.
<Astron. Astrophys., 466, 481-499 (2007)>
=2007A&A...466..481S 2007A&A...466..481S
ADC_Keywords: Galaxies, radio ; Photometry, infrared ; Surveys
Keywords: galaxies: clusters: general - galaxies: fundamental parameters -
galaxies: photometry - dust, extinction
Abstract:
The highly obscured radio-bright galaxy PKS 1343-601 at Galactic
coordinates of (l,b)=(309.7,+1.8) has been suspected to mark the
centre of a hitherto unknown cluster in the wider Great Attractor
region. As such it presents an ideal region for a search of galaxies
in the near-infrared (NIR) and an in-depth study of their colours as a
function of extinction. A visual search of a ∼30 square-degree area
centred on this radio galaxy on images of the NIR DENIS survey (IJK)
revealed 83 galaxies (including two AGNs) and 39 possible candidates.
Of these, 49 are also listed in the 2MASS Extended Source Catalog
2MASX. Taking the IRAS/DIRBE extinction values (Schlegel et al.,
1998ApJ...500..525S 1998ApJ...500..525S) at face value, the absorption in the optical (AB)
ranges from ∼2mag to over 100mag across the Galactic Plane. Comparing
the detections with other systematic surveys, we conclude that this
search is highly complete up to the detection limits of the DENIS
survey and certainly surpasses any automatic galaxy finding algorithm
applied to crowded areas.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 43 DENIS strips in the searched area
table2.dat 145 126 Galaxies in the search area
table3.dat 108 27 Galactic objects detected in the search area
table4.dat 117 126 Cross-identifications with other catalogues
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See also:
J/MNRAS/354/980 : Near-infrared survey around PKS 1343-601 (Nagayama+, 2004)
B/denis : The DENIS database (DENIS Consortium, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Slot Slot number (according to their designation
in the sky)
6- 10 I5 --- Strip Strip number (obs. of a given slot with a
unique number according to observing date) (1)
12- 21 A10 "DD/MM/YYYY" Date Date of observation
23- 24 I2 h RAh Strip central Right Ascension (J2000) (2)
26- 27 I2 min RAm Strip central Right Ascension (J2000) (2)
29- 32 F4.1 s RAs Strip central Right Ascension (J2000) (2)
34- 40 I7 --- Imagef Image numbers range for the searched area
41 A1 --- --- [-]
42- 48 I7 --- Imagel Image numbers range for the searched area
50- 52 A3 --- Band [IJK -] Observed passbands
54- 57 F4.2 --- PSFI ?=- Point-spread function on I image (3)
59- 62 F4.2 --- PSFJ ?=- Point-spread function on J image (3)
64- 67 F4.2 --- PSFK ?=- Point-spread function on K image (3)
69 I1 --- Qual ?=- Seeing quality as estimated from the
photometry of stars (4)
70 A1 --- n_Qual [)] Note on Qual (5)
72 I1 --- Weath ?=- Weather conditions (6)
74 I1 --- q_Strip ?=- astrometric quality of the strips (7)
76 I1 --- Prior ?=- Order of quality of strips with more than
one observation (8)
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Note (1): Strip numbers smaller than 3000 were part of the pre-survey
(these have no I-band counterparts, and the exposure time was
slightly larger); they were used for verification only since they
are not astrometrically and photometrically calibrated.
Note (2): Recall that each image has a width of about 12'.
Note (3): Half-flux radius as calculated by SExtractor multiplied by
2 (an equivalent to the point-spread function, PSF). The half-flux
radii were determined from all stars in the magnitude ranges
11.0m<I<15.0m, 9.0m<J<13.0m, and 7.0m<K<10.5m that do not lie
within 50 pixels of the image border.
Note (4): Quality flag as follows:
1 = good seeing (photometry not affected)
2 = medium seeing (7"-aperture photometry is affected)
3 = bad seeing (all magnitudes affected)
Note (5): An ) indicates that the Qual value is an estimate of the
seeing where the astrometry was insufficient for a statistical
comparison of the photometry in the overlap regions.
Note (6): Weather conditions as follows:
1 = no clouds
2 = unknown conditions
3 = possible clouds
4 = clouds
Note (7): The DENIS standard high accuracy of an rms of 0.2" is
indicated with a 1, lower accuracy with 2. For strips where
astrometric calibration failed we determined the coordinates
from the DSS*-red images (accuracy of about 2-3").
Note (8): Order of quality of strips with more than one observation
(1 indicates the best strip, higher numbers designate lower priorities).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [DZOA]
5- 11 A7 --- DZOA DZOA designation (NNNN-NN) (1)
13- 14 I2 --- Nobs Total number of sightings of same galaxy (2)
15 A1 --- n_Nobs [+] + when additional observation from the
pre-survey
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 26 F4.1 s RAs Right ascension (J2000)
27 A1 --- u_RAs Uncertainty flag on Right ascension
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 37 I2 arcsec DEs Declination (J2000)
38 A1 --- u_DEs Uncertainty flag on Declination
40- 45 F6.2 deg GLON Galactic longitude
47- 51 F5.2 deg GLAT Galactic latitude
53- 56 F4.1 mag AB B-band extinction
58- 59 A2 --- Class Classification of candidate (3)
61 I1 ---- Bvis [0/1] Visibility in B band (G1)
62 I1 ---- Ivis [0/1] Visibility in I band (G1)
63 I1 ---- Jvis [0/1] Visibility in J band (G1)
64 I1 ---- Kvis [0/1] Visibility in K band (G1)
66- 69 A4 --- MType Morphological type
71- 75 F5.2 mag Imag ?=- Total I magnitude
77- 80 F4.2 mag e_Imag ?=- rms uncertainty on Imag
82- 86 F5.2 mag Jmag ?=- Total J magnitude
88- 91 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
93- 97 F5.2 mag Kmag ?=- Total K magnitude
99-102 F4.2 mag e_Kmag ?=- rms uncertainty on Kmag
104-107 F4.2 mag (I-J)0 ?=- Dereddened I-J colour index
109-112 F4.2 mag e_(I-J)0 ?=- rms uncertainty on (I-J)0
114-117 F4.2 mag (I-K)0 ?=- Dereddened I-K colour index
119-122 F4.2 mag e_(I-K)0 ?=- rms uncertainty on (I-K)0
124-127 F4.2 mag (J-K)0 ?=- Dereddened J-K colour index
129-132 F4.2 mag e_(J-K)0 ?=- rms uncertainty on (J-K)0
134 I1 --- q_Imag Quality of I-band photometry (4)
135 I1 --- q_Jmag Quality of I-band photometry (4)
136 I1 --- q_Kmag Quality of I-band photometry (4)
138-139 I2 arcsec Idiam ?=- Major diameter in I band
141-142 I2 arcsec Jdiam ?=- Major diameter in J band
144-145 I2 arcsec Kdiam ?=- Major diameter in K band
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Note (1): Identity consisting of the lettering DZOA (for DENIS-ZOA)
followed by the DENIS slot number and a consecutive number for
each initial candidate
Note (2): Total number of sightings of same galaxy
(e.g., on overlap regions or repeat observations)
Note (3): Classification as follows:
DG = DENIS galaxy
UG = uncertain galaxy
BG = galaxy that was identified after consulting the WKK catalogue
NG = B-band galaxy that was found to be non-galaxian with DENIS
Note (4): Quality as follows:
0 = good photometry
2 = uncertainty in the 7"-aperture magnitude
3 = uncertainty in the total magnitude
4 = uncertainty in both
5 = means the 7"-aperture magnitude is unreliable
6 = unreliability in the total magnitude
7 = both 7"-aperture and total magnitude are unreliable
9 = the strip was non-photometric (strip 6052) and all photometry
is unreliable (the estimated extinction due to the clouds in
this case is ∼0.25-0.3mag. Magnitudes with quality parameters
5-9 have been excluded in the further analysis.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [DZOA]
5- 11 A7 --- DZOA DZOA designation (NNNN-NN)
12 A1 --- n_DZOA [a-d] Individual note (1)
14 I1 --- Nobs Total number of sightings of same galaxy
15- 16 A2 --- n_Nobs [+ ] + when additional observation from the
pre-survey
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 27 F4.1 s RAs Right ascension (J2000)
28 A1 --- u_RAs Uncertainty flag on Right ascension
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 38 I2 arcsec DEs Declination (J2000)
39 A1 --- u_DEs Uncertainty flag on Declination
41- 46 F6.2 deg GLON Galactic longitude
48- 52 F5.2 deg GLAT Galactic latitude
54- 58 F5.1 mag AB B-band extinction
60- 63 A4 --- Class Classification
65 I1 ---- Bvis [0/1] Visibility in B band (G1)
66 I1 ---- Ivis [0/1] Visibility in I band (G1)
67 I1 ---- Jvis [0/1] Visibility in J band (G1)
68 I1 ---- Kvis [0/1] Visibility in K band (G1)
70-108 A39 --- ONames Other names
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Note (1): Individual notes as follows:
a = While this object shows two apparent point sources in the K-band,
the B- and I-bands clearly show an elongated compact extended
emission with the brightest part positioned on one of the point
sources.
b = This object shows diffuse emission, as well as clumps, and
possibly a dust lane. It could be a PN or a YSO seen on-edge.
c = Very faint, it seems to show comparable features to DZOA4652-10
and DZOA4656-08.
d = An extremely bright point source in the K-band, is also shows
diffuse and clumpy extended emission and possible a dust lane
in all bands.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [DZOA]
5- 11 A7 --- DZOA DZOA designation (NNNN-NN)
13- 14 I2 h RAh Right ascension (J2000)
16- 17 I2 min RAm Right ascension (J2000)
19- 22 F4.1 s RAs Right ascension (J2000)
23 A1 --- u_RAs Uncertainty flag on Right ascension
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
29- 30 I2 arcmin DEm Declination (J2000)
32- 33 I2 arcsec DEs Declination (J2000)
34 A1 --- u_DEs Uncertainty flag on Declination
36- 39 F4.1 mag AB B-band extinction
41- 42 A2 --- Class Classification
44 I1 ---- Bvis [0/1] Visibility in B band (G1)
45 I1 ---- Ivis [0/1] Visibility in I band (G1)
46 I1 ---- Jvis [0/1] Visibility in J band (G1)
47 I1 ---- Kvis [0/1] Visibility in K band (G1)
49- 65 A17 --- 2MASX 2MASX designation (JHHMMSSss-DDMMSSs)
67- 69 A3 --- --- [WKK]
71- 74 I4 --- WKK ? WKK number (1)
76-117 A42 --- ONames Other names
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Note (1): WKK number (WKK98 NNN in Simbad) from
-- Fairall et al., 1998, Cat. J/A+AS/127/463,
-- Woudt et al., 1998A&A...338....8W 1998A&A...338....8W; 1999, Cat. J/A+A/352/39
and 2001, Cat. J/A+A/380/441.
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Global notes:
Note (G1): Visibility is
0=positive identification, 1=non-detection
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History:
* 14-May-2007: From electronic version of the journal
* 26-Jul-2007: table4, IRAS 13342-5830 corrected into IRAS 13342-5838
(End) Patricia Vannier [CDS] 14-May-2007