J/ApJS/159/242 325MHz radio survey in M31. II. (Gelfand+, 2005)
A wide-field, low-frequency radio image of the field of M31.
II. Source classification and discussion
Gelfand J.D., Lazio T.J.W., Gaensler B.M.
<Astrophys. J. Suppl. Ser., 159, 242-276 (2005)>
=2005ApJS..159..242G 2005ApJS..159..242G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Radio continuum ; Radio sources ; Photometry, infrared
Keywords: catalogs - galaxies: individual (M31) - radio continuum: galaxies -
radio continuum: general
Abstract:
We have previously presented the results of a 325MHz radio survey of
M31 (Cat. J/ApJS/155/89, conducted with the A configuration of the
Very Large Array. In this survey, a total of 405 radio sources between
≲6" and 170" in extent were mapped with a resolution of 6" and a
sensitivity of ∼0.6mJy/beam. Here we compare the resultant source list
and image with other radio, IR, optical, and X-ray observations and
catalogs of the region.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 48 36 Steep spectrum (α←1.3) GLG sources
table2.dat 48 44 Flat spectrum (-0.5<α<0.5) GLG sources
table3.dat 49 25 GLG sources with spectral turnover
(φ≥3σφ)
table5.dat 80 6 IR magnitudes and colors of 2MASS Extended Source
Catalog (Cat. VII/233) counterparts of GLG sources
table6.dat 82 26 IR magnitude and colors of 2MASS PSC (Cat. II/246)
counterparts of GLG sources
table8.dat 76 23 GLG sources with a good match in the MagOpt catalog
(Cat. II/208)
table9.dat 83 26 Good X-ray counterparts of GLG sources
--------------------------------------------------------------------------------
See also:
J/ApJS/155/89 : 325MHz radio survey in M31 (Gelfand+, 2004)
J/A+AS/61/451 : The 37W catalogue of radio sources in M31 (Walterbos+ 1985)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003)
II/208 : BVRI CCD photometry in the field of M 31 (Magnier+ 1992)
Byte-by-byte Description of file: table1.dat table2.dat table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GLG]
4- 6 I3 --- GLG GLG source name
8- 10 A3 --- Type Source type (G1)
12- 17 F6.2 mJy S325MHz Source flux at 325MHz
19- 23 F5.2 mJy e_S325MHz Uncertainty in S325MHz
25- 26 A2 --- f_Sp+Index Limit flag on Sp+Index
28- 32 F5.2 --- Sp+Index Spectral index (1)
34- 37 F4.2 --- e_Sp+Index ? Uncertainty in Sp+Index
39- 43 F5.2 --- phi ? Spectral curvature parameter (1) (G2)
45- 49 F5.3 --- e_phi ? Uncertainty in phi
--------------------------------------------------------------------------------
Note (1): The spectral index α and the spectral curvature parameter φ
are defined using the convention:
Sν=ναexp[-φ(ν-2.1)]
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GLG]
4- 6 I3 --- GLG GLG source name
8- 9 A2 --- Type Source type (G1)
11- 19 A9 --- --- [2MASS-EXT]
20- 35 A16 --- 2MASS The 2MASS name (Cat. VII/233)
37- 40 F4.2 arcsec Offset GLG and 2MASS position offset
42- 45 F4.1 mag Jmag 2MASS Extended Source Catalog J band magnitude
47- 50 F4.2 mag e_Jmag Uncertainty in Jmag
52- 55 F4.1 mag Hmag 2MASS Extended Source Catalog H band magnitude
57- 60 F4.2 mag e_Hmag Uncertainty in Hmag
62- 65 F4.1 mag Kmag 2MASS Extended Source Catalog K band magnitude
67- 70 F4.2 mag e_Kmag Uncertainty in Kmag
72- 75 F4.2 mag J-H 2MASS (J-H) color index
77- 80 F4.2 mag H-K 2MASS (H-K) color index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GLG]
4- 6 I3 --- GLG GLG source name
8- 9 A2 --- Type Source type (G1)
11- 26 A16 --- 2MASS The 2MASS name (Cat. II/246)
28- 32 F5.2 arcsec Offset GLG and 2MASS position offset
34- 37 F4.1 mag Jmag 2MASS Point Source Catalog J band magnitude
39- 42 F4.2 mag e_Jmag Uncertainty in Jmag
44- 47 F4.1 mag Hmag 2MASS Point Source Catalog H band magnitude
49- 52 F4.2 mag e_Hmag Uncertainty in Hmag
54- 57 F4.1 mag Kmag 2MASS Point Source Catalog K band magnitude
59- 62 F4.2 mag e_Kmag Uncertainty in Kmag
64- 67 F4.1 mag Bmag ? Source B band magnitude
69- 72 F4.1 mag Rmag ? Source R band magnitude
74- 77 F4.2 mag J-H 2MASS (J-H) color index
79- 82 F4.2 mag H-K 2MASS (H-K) color index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table8.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GLG]
4- 6 I3 --- GLG GLG source name
8- 9 A2 --- Type Source type (G1)
11- 17 F7.2 mJy S325MHz Source 325MHz flux density
19- 24 A6 --- --- [MagOpt]
25- 31 A7 --- [MLV92] The MagOpt catalog name (Cat. II/208)
33- 36 F4.2 arcsec Offset GLG and MagOpt position offset
38- 41 F4.1 mag Bmag ? MagOpt (Cat. II/208) counterpart B band
magnitude
43- 46 F4.2 mag e_Bmag ? Uncertainty in Bmag
48- 51 F4.1 mag Vmag ? MagOpt (Cat. II/208) counterpart V band
magnitude
53- 56 F4.2 mag e_Vmag ? Uncertainty in Vmag
58- 61 F4.1 mag Rmag ? MagOpt (Cat. II/208) counterpart R band
magnitude (Cousins)
63- 66 F4.2 mag e_Rmag ? Uncertainty in Rmag
68- 71 F4.1 mag Imag MagOpt (Cat. II/208) counterpart I band
magnitude (Cousins)
73- 76 F4.2 mag e_Imag Uncertainty in Imag
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table9.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [GLG]
4- 6 I3 --- GLG GLG source name
8 A1 --- Type Source type (G1)
10- 41 A32 --- XName The X-ray name (2)
43- 47 F5.2 arcsec Offset GLG and X-ray position offset
49- 52 F4.2 arcsec e_Offset ? Uncertainty in Offset
54- 58 F5.2 --- HR1 ? First hardness ratio (3)
60- 63 F4.2 --- e_HR1 ? Uncertainty in HR1
65- 68 F4.2 --- HR2 ? Second hardness ratio (3)
70- 73 F4.2 --- e_HR2 ? Uncertainty in HR2
75 A1 --- l_XFlux Limit flag on XFlux
76- 83 E8.2 mW/m2 XFlux ? The 0.1-2.0keV band flux (4)
--------------------------------------------------------------------------------
Note (2): "RASS" sources are from the ROSAT All-Sky survey (Voges et al.
(2000IAUC.7432R...3V 2000IAUC.7432R...3V); Voges et al. (1999, Cat. IX/10)),
"RX" sources are from the ROSAT Second PSPC survey of M31 (Supper et
al. 2001, Cat. J/A+A/373/63),
"r" sources are from the Kong et al. (2002, Cat. J/ApJ/577/738)
X-ray survey of M31,
"HRC" sources are from the Williams et al. (2004, J/ApJ/609/735)
X-ray survey of M31, and
"XMM North" sources are from the XMM survey of M31 (Sergey
Trudolyubov, private communication).
Note (3): HR1=(H1+H2-S)/(H1+H2+S) and HR2=(H2-H1)/(H2+H1) where S is the
count rate of photons with energy Eγ between 0.1 and 0.4keV,
H1 is the count rate of photons with Eγ=0.4-0.9keV, and
H2 is the count rate of photons with Eγ=0.9-2.0keV.
Note (4): In units of erg/cm/2/s and assumes a power law with photon index
Γ=-2.0 and NH=9.1020cm-2, and is calculated using data
from the Second ROSAT PSPC Survey of M31 (Supper et al. 2001, Cat.
J/A+A/373/63).
--------------------------------------------------------------------------------
Global Notes:
Note (G1): Source type, defined as follows:
U = Unresolved;
El = Elongated;
C = Complex;
Ex = Extended;
ExG = Good Extended.
Note (G2): Was calculated only for those sources detected in three radio
surveys, including this one.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Gelfand et al., Paper I 2004ApJS..155...89G 2004ApJS..155...89G, Cat. J/ApJS/155/89
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 02-Nov-2005