J/A+A/466/41 XMM-Newton survey in the Marano Field. I. (Krumpe+, 2007)
The XMM-Newton survey in the Marano Field.
I. The X-ray data and optical follow-up.
Krumpe M., Lamer G., Schwope A.D., Wagner S., Zamorani G., Mignoli M.,
Staubert R., Wisotzki L., Hasinger G
<Astron. Astrophys. 466, 41 (2007)>
=2007A&A...466...41K 2007A&A...466...41K
ADC_Keywords: Surveys - X-ray sources ; Galaxies, photometry
Keywords: surveys - X-rays: galaxies - galaxies: active -
galaxies: quasars: general
Abstract:
We report on a medium deep XMM-Newton survey of the Marano Field and
optical follow-up observations. The mosaicked XMM-Newton pointings in
this optical quasar survey field cover 0.6 deg2 with a total of 120ks
good observation time. We detected 328 X-ray sources in total. The
turnover flux of our sample is fX∼5x10-15erg/cm2/s in the
0.2-10keV band. With VLT FORS1 and FORS2 spectroscopy we classified 96
new X-ray counterparts.
The central 0.28deg2, where detailed optical follow-up observations
were performed, contain 170 X-ray sources (detection likelihood
ML>10), out of which 48 had already been detected by ROSAT. In this
region we recover 23 out of 29 optically selected quasars. With a
total of 110 classifications in our core sample we reach a
completeness of ∼65%. About one-third of the XMM-Newton sources are
classified as type II AGN with redshifts mostly below 1.0.
Furthermore, we detect five high redshift type II AGN (2.2≤z≤2.8).
Description:
Optical and X-ray properties of spectroscopically investigated
candidate counterparts of Marano XMM-Newton X-ray sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
xray.dat 98 351 X-ray source list (tablea1 and tableb2 of the paper)
opt.dat 107 222 Optical properties of candidate counterparts of
X-ray sources (table8 and tableb2 of the paper)
tabled1.dat 52 60 Optical data of additional objects
notes.dat 80 145 Individual notes
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Byte-by-byte Description of file: xray.dat
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Bytes Format Units Label Explanations
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1 A1 --- Sample [Xm] Marano (X) or marginal Marano (m) field
3- 5 I3 --- Seq Sequential number
7- 10 A4 --- --- [XMMU]
12- 27 A16 --- XMMU XMMU designation (JHHMMSS.s+DDMMSS)
29- 34 F6.1 ct/ks CR Added count rates from all 3 EPIC cameras
36- 39 F4.1 ct/ks e_CR rms uncertainty on CR
41- 46 F6.1 --- ML Maximum detection likelihood
48- 52 F5.2 arcsec sigmaX Position error of the X-ray source
54- 59 F6.3 --- HR1 ?=- PN-detector hardness ratio in the
0.2-0.5keV and 0.5-2.0keV band
61- 65 F5.3 --- e_HR1 ?=- rms uncertainty on HR1
67- 72 F6.3 --- HR2 ?=- PN-detector hardness ratio in the
0.5-2.0keV and 2.0-4.5keV band
74- 78 F5.3 --- e_HR2 ?=- rms uncertainty on HR2
80- 85 F6.3 --- HR3 ?=- PN-detector hardness ratio in the
2.0-4.5keV and 4.5-7.5keV band
87- 91 F5.3 --- e_HR3 ?=- rms uncertainty on HR3
93- 98 F6.3 10-17W/m2 Flux EPIC flux in a 0.2-10keV energy band (1)
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Note (1): Determined from the sum of mos1-, mos2-, and pn-count rates
in the 0.2-12.0keV via an energy conversion factor of
1.61452E-12 [erg/cm2].
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Byte-by-byte Description of file: opt.dat
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Bytes Format Units Label Explanations
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1 A1 --- Sample [Xm] Marano (X) or marginal Marano (m) field
3- 5 I3 --- Seq X-ray source sequential number (1)
6 A1 --- m_Seq [AB] Candidate suffix (1)
8 I1 h RAh Optical counterpart right ascension (J2000)
10- 11 I2 min RAm Optical counterpart right ascension (J2000)
13- 16 F4.1 s RAs Optical counterpart right ascension (J2000)
18 A1 --- DE- Optical counterpart declination sign (J2000)
19- 20 I2 deg DEd Optical counterpart declination (J2000)
22- 23 I2 arcmin DEm Optical counterpart declination (J2000)
25- 26 I2 arcsec DEs Optical counterpart declination (J2000)
28- 32 F5.2 arcsec DistOX Spatial offset between the X-ray and
optical positions
34- 38 F5.2 mag Kmag ?=- SOFI K magnitude of the
spectroscopically classified candidate
40- 44 F5.2 mag Rcmag ?=- WFI R magnitude of the
spectroscopically classified candidate
46 A1 --- Class [BGNS?-] Spectroscopic classification
of the identified object (2)
48- 52 F5.3 --- z ?=- Spectroscopic redshift of the
identified object (3)
54 I1 --- q_Seq [0/1]?=- X-ray identification flag (4)
55 I1 --- q_z [0/1]?=- Redshift reliability flag (5)
56 I1 --- q_Class [0/1]?=- Classification reliability flag (6)
58- 62 F5.2 [mW/m2] log(LXobs) ?=- Observed rest-frame X-ray luminosity
in the 0.2-10keV energy band (7)
64- 69 F6.2 mag BMAG ?=- Absolute Johnson B magnitude (8)
71- 74 F4.2 --- alphaOX ?=- Broad band spectral index (9)
76- 81 F6.2 10+22cm-2 NH ?=- X-ray absorbing hydrogen column density
83- 87 F5.2 10+22cm-2 e_NH ? Error on NH (lower value)
89- 93 F5.2 10+22cm-2 E_NH ? Error on NH (upper value)
95- 99 F5.2 [mW/m2] log(LXint) ?=- Intrinsic rest-frame X-ray luminosity
in the 0.2-10keV energy band after X-ray
flux correction for the absorbing
hydrogen column density
101-105 A5 --- Rem Remarks (10)
107 A1 --- n_Seq [*] indicates a note detailed in notes.dat
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Note (1): Classification of a counterpart object consists of the sequence
number of the X-ray source list and a suffix (A, B) to discriminate
between different candidates.
Note (2): Spectroscopic classification of the identified object as follows:
S = star
G = normal galaxy (no emission lines)
N = narrow emission line galaxy with unresolved emission lines (at
6000Å our spectral resolution of 21Å corresponds to 1050km/s)
B = broad emission line object (all measured line widths have
vFWHM>2500km/s)
? = undefined object
Note (3): The redshift is taken from the literature for objects with 1--
and 0-- in column Flags. In that cases, objects have only an X-ray
identification flag since their redshift and classification relies on
follow-up surveys previously done in the Marano Field (see Remarks)
Note (4): X-ray identification flag is:
1 = Objects which we consider to be the correct identification
of the X-ray source
0 = objects not considered as the X-ray source
Note (5): Redshift reliability flags is:
1 = reliable, well-established redshift determined by
several spectral features
0 = objects where the redshift determination relies on
a single but reasonable spectral feature
Note (6): Classification reliability is:
1 = object type as given in "Class" is well established and reliable
0 = uncertain classification of the object type. Either high SNR
spectral features of the object do not allow a proper
classification or the optical spectra do not allow to give a
reliable classification of the object type because of a low
SNR and/or insufficient wavelength coverage of the optical spectra
Note (7): X-ray luminosity calculated by using Eq. (1).
The k-correction vanishes since we assume an energy index α=-1
with Fnu∼nuα∼nu1-Γ (Γ = photon index) based on
Alexander et al. (2003AJ....125..383A 2003AJ....125..383A) and Mainieri et al. (2002, Cat.
J/A+A/393/425). The luminosity distance dL was computed by the
analytical fit for flat cosmologies with Ω=0.3,
Ω=0.7, H0=70km/s/Mpc following Szokoly et al. (2004,
cat. J/ApJs/155/271). LX=([4πdL2]/[(z+1)α+1])*fX
Note (8): Absolute magnitudes MB (in the Johnson system) were estimated
only for type I AGN using the relation MB=R+5-5log(dL/pc)+K(z),
where dL is the luminosity distance and K(z) is the customary
k-correction term. In our case, this term includes the transition
from observed-frame R-band to rest-frame B-band, assuming a mean
spectral energy distribution for all sources, and also the (1+z)
bandwidth stretching factor. For the type I AGN we computed K(z)
from the composite SDSS quasar spectrum (Vanden Berk et al.,
2001AJ....122..549V 2001AJ....122..549V).
Note (9): The broad band spectral index αOX roughly characterises
the UV-X-ray spectral energy distribution by connecting the rest-frame
points at 2500Å and 1keV with a simple power-law, F(nu)∼nu-α.
For each broad emission line AGN we estimated its flux at a fixed
rest-frame wavelength of lambda=2500Å, applying the relation
mAB(2500Å)=R+Δm(z), where R is the quoted R-band magnitude,
mAB(2500Å) is the predicted magnitude at 2500Å expressed in
the AB system for easy conversion into monochromatic fluxes, and
Δm(z) is a redshift-dependent term (similar, but not identical
to the k-correction) that also accounts for the zeropoint
transformation from the Vega to the AB system. Our adopted Δm(z)
relation, again computed from the SDSS composite quasar spectrum of
Vanden Berk et al. (2001AJ....122..549V 2001AJ....122..549V).
Notice that at the typical redshifts of z∼1.5 of our broad line AGN,
the observed R-band approximately traces a rest-frame wavelength of
lambdarest∼2600Å, implying that the spectral energy distribution
corrections are small. The resulting AB magnitudes are then converted
into fluxes following the definition of the AB system (oke):
mAB(2500Å)=-2.5log(Fnu(2500Å))-48.60, where Fnu(2500Å)
is given in erg/s/cm2/Hz. The X-ray flux at 1keV is computed by:
f(0.2-10keV)=Fnu(1keV){{integral}0.2-10keV}[EαdE]
with α=-1.
Hence, the broad band spectral index is obtained as:
αOX= log[Fnu(2500Å)/Fnu(1keV)]/log[nu(1keV)/nu(2500Å)]
Note (10): Individual remarks as follows:
1 = optically selected and spectroscopically classified quasar by
Marano et al. (1988MNRAS.232..111M 1988MNRAS.232..111M)
2 = optically selected and spectroscopically classified quasar by
Zitelli et al. (1992MNRAS.256..349Z 1992MNRAS.256..349Z)
3 = ROSAT X-ray source with spectroscopic classification and redshift
determination by Zamorani et al. (1999A&A...346..731Z 1999A&A...346..731Z)
4 = ROSAT X-ray source with no or wrong identification by Zamorani et al.
(1999A&A...346..731Z 1999A&A...346..731Z)
5 = unclassified radio objects within 5.0" (Gruppioni et al.,
1999MNRAS.304..199G 1999MNRAS.304..199G)
6 = spectroscopic classification and redshift taken from Teplitz et al.
(2003, Cat. J/ApJS/146/209)
7 = radio source, spectroscopic classification and redshift taken from
Gruppioni et al. (1999MNRAS.304..199G 1999MNRAS.304..199G)
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Byte-by-byte Description of file: tabled1.dat
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Bytes Format Units Label Explanations
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2- 3 I2 --- Seq Identification number of classified source
4- 5 A2 --- --- [MA] Marano Additional
7- 8 I2 h RAh Right Ascension J2000 (hours)
10- 11 I2 min RAm Right Ascension J2000 (minutes)
13- 16 F4.1 s RAs Right Ascension J2000 (seconds)
18 A1 --- DE- Declination J2000 (sign)
19- 20 I2 deg DEd Declination J2000 (degrees)
22- 23 I2 arcmin DEm Declination J2000 (minutes)
25- 26 I2 arcsec DEs Declination J2000 (seconds)
30- 34 F5.3 --- z Spectroscopic redshift
38- 42 F5.2 mag Kmag ?=--- SOFI K-band magnitude of the object
46- 50 F5.2 mag Rmag ?=--- WFI R-band magnitude of the object
52 A1 --- Cl [SGN] Classification, as S=Star, G=Galaxy,
and N=narrow emission line galaxy
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
4 A1 --- m_Seq [AB] Candidate suffix
6- 80 A75 --- Note Text of the note
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Acknowledgements:
Mirko Krumpe,
History:
* 07-Feb-2007: Original version
* 22-Nov-2007: tables A1, B1 abd B2 added, from electronic version
and tables merged into xray.dat and opt.dat
* 29-Aug-2008: Table D1 added, from electronic version
(End) Patricia Vannier [CDS] 07-Feb-2007