J/ApJ/681/113 Swift BAT survey of AGNs (Tueller+, 2008)
Swift BAT survey of AGNs.
Tueller J., Mushotzky R.F., Barthelmy S., Cannizzo J.K., Gehrels N.,
Markwardt C.B., Skinner G.K., Winter L.M.
<Astrophys. J., 681, 113-127 (2008)>
=2008ApJ...681..113T 2008ApJ...681..113T
ADC_Keywords: Surveys ; Gamma rays ; X-ray sources ; Active gal. nuclei
Keywords: galaxies: active - gamma rays: observations - surveys
Abstract:
We present the results of the analysis of the first 9 months of data
of the Swift BAT (Burst Alert Telescope) survey of AGNs in the
14-195keV band. Using archival X-ray data or follow-up Swift X-ray
telescope (XRT) observations, we have identified 129 (103 AGNs) of 130
objects detected at |b|>15° and with significance >4.8σ. One
source remains unidentified. These same X-ray data have allowed
measurement of the X-ray properties of the objects.
Description:
The second BAT catalog is based on the first 9 months of BAT data
(starting 2005 mid-December) and has several refinements compared to
the catalog of the first 3 months of data (Markwardt et al., 2005,
Cat. J/ApJ/633/L77). The combination of increased exposure, more
uniform sky coverage, and improved software has increased the total
number of BAT sources by a factor ∼2.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 154 Swift Survey Table
refs.dat 103 50 References
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See also:
J/ApJ/633/L77 : SWIFT/BAT detections of AGN (Markwardt+, 2005)
J/ApJ/678/102 : BAT X-ray survey. I. (Ajello+, 2008)
J/ApJ/673/96 : BAT X-ray Survey. III. (Ajello+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential number
5- 9 A5 --- --- [SWIFT]
11- 22 A12 --- SWIFT SWIFT designation (JHHMM.m+DDMM) (1)
23 A1 ---- m_SWIFT [ab] Multiplicity index on SWIFT
24 A1 ---- n_SWIFT [l] 3-month survey detection (2)
26- 49 A24 --- OID Identification of counterpart (3)
51- 58 F8.4 deg RAdeg Right ascension in decimal degrees (J2000) (4)
60- 67 F8.4 deg DEdeg Declination in decimal degrees (J2000) (4)
69- 70 A2 --- Flag ">15°" flag (5)
72- 76 F5.2 --- SNR Signal-to-noise ratio
78- 81 F4.1 10-14W/m2 fBAT BAT fluxes in the 14-195keV band
83- 90 F8.6 --- z ? Redshift
92- 96 F5.2 [10-7W] logL ? Luminosity in the 14-195keV band (6)
98 A1 --- l_logNH Limit flag on lognH
99-103 F5.2 [cm-2] logNH ? Hydrogen column density
105-106 I2 --- r_logNH ? logNH references, in refs.dat file
108 A1 --- Cplx [y] y indicates that the spectrum differs
significantly from a simple power law
with absorption and an Fe line
110-119 A10 --- Type Optically derived type (7)
120 A1 --- n_Type [+*] Estimated classification (8)
122-123 I2 --- r_Type ? Reference for the type and/or z, where this
is not from NED, in refs.dat file
125-129 F5.2 mag Jmag ? 2MASS J magnitude
131-136 F6.3 ct/s fROSAT ? ROSAT flux from the HEASARC database,
Schwope et al., 2000, Cat. J/AN/231/1 (9)
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Note (1): The Swift name given is based on the source coordinates from
the latest analysis of Swift data except that where a name has been
previously published it is kept to avoid confusion.
Note (2): l = Sources detected in the 3 month survey (Markwardt et al.,
2005, Cat. J/ApJ/633/L77)
Note (3): The ID name given is that of the entry in the NED database
(except in those few cases there is none)
Note (4): J2000.0 coordinates for the identified counterpart.
Note (5): Flag for sources included in the quantitative analysis:
y = source is at |b|>15°
y* = source is at |b|>15° and SNR is also >4.8σ
Note (6): Distances for luminosity were calculated using the measured
redshift and assuming it was due to Hubble flow. Luminosity errors
must include the error in measured flux and the error in distance due
to the random velocity of galaxies (∼500km/s).
Note (7): For well-studied AGNs, the optical type was derived from
Veron-Cetty & Veron (2006, Cat. VII/248). For the remaining sources,
we determined type by examining the spectrum from archival data or
from our own observations.
Note (8): Flag as follows:
+ = few remaining AGNs without an accessible spectrum
* = we classify 2MASX J09180027+0425066 as a QSO because its
luminosity is greater than 1044.5erg/cm2/s, and as type II
because of its very strong narrow OIII lines in SSDS.
Note (9): The J band is better to use than the K band because it is
expected to have a better sensitivity in detecting local AGNs.
The colors of hard X-ray selected AGNs have J/K values ∼1 at low
redshifts, and galaxies at low z also have J/K∼1 (Watanabe et al.,
2004, Cat. J/ApJ/610/128). The 2MASS survey is more sensitive in J (see
http://www.ipac.caltech.edu/2mass/releases/second/doc/figures/secvi2af5.gif,
where it is shown that the survey goes ∼1mag more sensitive in J than K).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 21 A18 --- Survey Survey or database
23- 43 A21 --- Aut Author's name
45- 63 A19 --- BibCode BibCode
64-103 A40 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Sep-2009