J/MNRAS/355/97 Chandra/ELAIS mid-infrared sources (Manners+, 2004)
Mid-infrared sources in the ELAIS Deep X-ray Survey.
Manners J.C., Serjeant S., Bottinelli S., Vaccari M., Franceschini A.,
Perez-Fournon I., Gonzalez-Solares E., Willott C.J., Johnson O.,
Almaini O., Rowan-Robinson M., Oliver S.
<Mon. Not. R. Astron. Soc., 355, 97-105 (2004)>
=2004MNRAS.355...97M 2004MNRAS.355...97M
ADC_Keywords: X-ray sources ; Infrared sources ; Cross identifications
Keywords: surveys - galaxies: active - quasars: general - X-rays: galaxies -
X-rays: general
Abstract:
We present a cross-correlation of the European Large Area Infrared
Space Observatory (ISO) survey (ELAIS) with the ELAIS Deep X-ray
Survey of the N1 and N2 fields. There are seven Chandra point sources
with matches in the ELAIS Final Analysis 15µm catalogue, out of a
total of 28 extragalactic ISO sources present in the Chandra fields.
Five of these are consistent with active galactic nuclei (AGN) giving
an AGN fraction of ∼19 per cent in the 15µm flux range 0.8-6mJy. We
have co-added the hard X-ray fluxes of the individually undetected ISO
sources and find a low significance detection consistent with star
formation in the remaining population. We combine our point source
cross-correlation fraction with the XMM-Newton observations of the
Lockman Hole and Chandra observations of the Hubble Deep Field North
to constrain source count models of the mid-infrared galaxy
population. The low dust-enshrouded AGN fraction in ELAIS implied by
the number of cross-identifications between the ELAIS mid-infrared
sample and the Chandra point sources is encouraging for the use of
mid-infrared surveys to constrain the cosmic star formation history,
provided there are not further large undetected populations of
Compton-thick AGN.
Description:
As part of ELAIS, ISOCAM observations were carried out covering
10.3deg2 at 15um. The observations were carried out in raster mode,
with most of the survey area confined to three northern fields
(N1, 2.67deg2; N2, 2.67deg2; N3, 0.88deg2)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 120 7 Chandra sources with ISOCAM 15µm counterparts
in the ELAIS regions N1 & N2
table2.dat 193 7 Multiwaveband data for each cross-correlated source
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See also:
II/255 : SWIRE ELAIS N1 Source Catalogs (Surace+, 2004)
J/AJ/127/3075 : Mid-infrared population of ELAIS-S1 sample (La Franca+ 2004)
J/MNRAS/325/1173 : ISO ELAIS 15µm survey (Lari+, 2001)
J/MNRAS/343/293 : ELAIS deep X-ray survey. I. (Manners+, 2003)
J/MNRAS/351/1290 : ELAIS: final band-merged catalogue (Rowan-Robinson+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- [MJA2003] Source name (N1_NN or N2_NNN)
8- 9 I2 h RAh Chandra Right ascension (J2000.0)
11- 12 I2 min RAm Chandra Right ascension (J2000.0)
14- 18 F5.2 s RAs Chandra Right ascension (J2000.0)
20 A1 --- DE- Chandra Declination sign (J2000.0)
21- 22 I2 deg DEd Chandra Declination (J2000.0)
24- 25 I2 arcmin DEm Chandra Declination (J2000.0)
27- 30 F4.1 arcsec DEs Chandra Declination (J2000.0)
32- 33 I2 h RAIh ISO Right ascension (J2000.0)
35- 36 I2 min RAIm ISO Right ascension (J2000.0)
38- 42 F5.2 s RAIs ISO Right ascension (J2000.0)
44 A1 --- DEI- ISO Declination sign (J2000.0)
45- 46 I2 deg DEId ISO Declination (J2000.0)
48- 49 I2 arcmin DEIm ISO Declination (J2000.0)
51- 54 F4.1 arcsec DEIs ISO Declination (J2000.0)
56- 59 F4.2 arcsec Offset Offset between Chandra and 15um-ISO positions
61- 64 F4.2 10-3 Prob Probability of this cross-correlation being a
random association
66- 74 E9.2 mW/m2 FX Chandra full band (0.5-8keV) flux (Manners et
al., 2003, Cat. J/MNRAS/343/293)
76- 80 F5.3 mJy F15um ISOCAM 15Um flux density (Rowan-Robinson et
al., 2004, Cat. J/MNRAS/351/1290)
82- 87 F6.4 --- z ? Spectroscopic redshift (1σ error ∼0.1)
88 A1 --- n_z [a] a: photometric redshift
90- 94 A5 --- Class Classification suggested by this paper
(SB or AGN)
96 A1 --- n_Class [b] b: classification previously confirmed by
optical spectroscopy
98-120 A23 --- CXOE ELAIS designation, CXOEN1 JHHMMSS.s+DDMMSS or
CXOEN2 JHHMMSS.s+DDMMSS
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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- 6 A6 --- [MJA2003] Source name (N1_NN or N2_NNN)
7- 11 F5.2 mJy S1.4GHz ? Flux at 1.4GHz
13- 16 F4.2 mJy e_S1.4GHz ? rms uncertainty on S1.4GHz
17 A1 --- n_S1.4GHz [cd] Note on S1.4GHz (1)
19- 21 I3 mJy S175um ? ISO flux density at 175um
23- 25 I3 mJy e_S175um ? rms uncertainty on S175um
27- 29 I3 mJy S100um ? IRAS flux density at 100um
31- 33 I3 mJy e_S100um ? rms uncertainty on S100um
34 A1 --- n_S100um [a] Note on S100um (1)
36- 38 I3 mJy S90um ? ISO flux density at 90um
40- 41 I2 mJy e_S90um ? rms uncertainty on S90um
43- 45 I3 mJy S60um ? IRAS flux density at 60um
47- 48 I2 mJy e_S60um ? rms uncertainty on S60um
49 A1 --- n_S60um [a] Note on S60um (1)
51- 54 F4.2 mJy S15um ? ISO flux density at 15um
56- 59 F4.2 mJy e_S15um ? rms uncertainty on S15um
61- 64 F4.2 mJy S6.7um ? ISO flux density at 6.7um
66- 69 F4.2 mJy e_S6.7um ? rms uncertainty on S6.7um
71- 75 F5.2 mag Kmag ? K (2.2um) magnitude, in Vega magnitude
77- 80 F4.2 mag e_Kmag ? rms uncertainty on Kmag
81 A1 --- n_Kmag [c] Note on Kmag (1)
83- 87 F5.2 mag Hmag ? H (1.65um) magnitude, in Vega magnitude
89- 92 F4.2 mag e_Hmag ? rms uncertainty on Hmag
93 A1 --- n_Hmag [b+] Note on Hmag (1)
95- 99 F5.2 mag Jmag ? J (1.25um magnitude, in Vega magnitude
101-104 F4.2 mag e_Jmag ? rms uncertainty on Jmag
106-110 F5.2 mag i'mag ? i' (775nm) magnitude, in Vega magnitude
112-115 F4.2 mag e_i'mag ? rms uncertainty on i'mag
116 A1 --- n_i'mag [b] Note on i'mag (1)
118-122 F5.2 mag r'mag ? r' (623nm) magnitude, in Vega magnitude
124-127 F4.2 mag e_r'mag ? rms uncertainty on r'mag
128 A1 --- n_r'mag [b] Note on r'mag (1)
130-134 F5.2 mag g'mag ? g' (486nm) magnitude, in Vega magnitude
136-139 F4.2 mag e_g'mag ? rms uncertainty on g'mag
140 A1 --- n_g'mag [b+] Note on g'mag (1)
142-146 F5.2 mag Umag ? U (361nm) magnitude, in Vega magnitude
148-151 F4.2 mag e_Umag ? rms uncertainty on Umag
152 A1 --- n_Umag [b+] Note on Umag
154 A1 --- l_F0.5-2keV Limit flag on F0.5-2keV
155-158 F4.1 10-18W/m2 F0.5-2keV ? Flux in the 0.5-2keV band
160-162 F3.1 10-18W/m2 e_F0.5-2keV ? rms uncertainty on F0.5-2keV
164 A1 --- l_F2-8keV Limit flag on F2-8keV
165-168 F4.1 10-18W/m2 F2-8keV ? Flux in the 2-8keV band
170-172 F3.1 10-18W/m2 e_F2-8keV ? rms uncertainty on F2-8keV
174-177 F4.2 --- alphaIX ? Mid-infrared to hard X-ray relation
179-182 F4.2 --- e_alphaIX ? rms uncertainty on alphaIX
184-188 F5.2 --- HR ? X-ray hardness ratio, Manners et al.,
2003, Cat. J/MNRAS/343/293
190-193 F4.2 --- e_HR ? rms uncertainty on HR
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Note (1): Notes as follows:
X-ray data are from Manners et al. (2003, Cat. J/MNRAS/343/293)
Other waveband data are taken from Rowan-Robinson et al. (2004,
Cat. J/MNRAS/351/1290) except
a = Moshir et al. (1990, IRAS FSC, Cat. II/156)
b = Gonzalez-Solares et al. (in preparation)
c = Willott et al. (2003MNRAS.339..397W 2003MNRAS.339..397W)
d = Ciliegi et al. (1999, Cat. J/MNRAS/302/222)
+ = aperture magnitudes provided by E. Gonzalez-Solares.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 20-May-2005