J/ApJS/226/17 BRI observations of the QSO Zw III 2 (Liao+, 2016)
Discovery of γ-ray emission from the radio-intermediate quasar III Zw 2:
violent jet activity with intraday γ-ray variability.
Liao N.-H., Xin Y.-L., Fan X.-L., Weng S.-S., Li S.-K., Chen L., Fan Y.-Z.
<Astrophys. J. Suppl. Ser., 226, 17-17 (2016)>
=2016ApJS..226...17L 2016ApJS..226...17L (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Photometry, UBVRI ; Ultraviolet ; X-ray sources
Keywords: galaxies: active; galaxies: jets; quasars: individual: III Zw 2
Abstract:
III Zw 2 is the prototype of radio-intermediate quasars. Although
there is the evidence of possessing strong jet, significant
γ-ray emission has not been reported before. In this work, we
carry out a detailed analysis of the latest Fermi-LAT Pass 8 data. No
significant γ-ray signal has been detected in the time-averaged
7-year Fermi-LAT data of III Zw 2; however, we have identified two
distinct γ-ray flares with isotropic luminosities of
∼1045erg/s. Multiwavelength data analysis (also including the
optical photometric observations from Yunnan Observatories) are
presented and the main finding is simultaneous optical and γ-ray
flares of III Zw 2 appearing in 2009 November. Violent γ-ray
variability with a doubling timescale of 2.5hr was detected in another
γ-ray flare in May 2010, for which the 3-hr γ-ray peak
flux is ∼250 times of the average flux in 7 years. Rather similar
behaviors are observed in blazars and the blazar model can reasonably
reproduce the spectral energy distribution of III Zw 2 in a wide
energy range, strongly suggesting that its central engine resembles
that of blazars. In view of its core, which shares radio similarities
with young radio sources, together with weak extended radio lobe
emission, we suggest that III Zw 2 harbors a recurrent activity core
and thus serves as a valuable target for investigating the fueling and
triggering of the activity in radio-loud active galactic nuclei.
Description:
The Pass 8 data used in this paper were collected during the first
seven years operation of Fermi-LAT (i.e., from 2008 August 4th to 2015
August 4th). Photon events with energy ranging from 100MeV to 500GeV,
were taken into account.
When available, we analyzed both Swift XRT and UVOT data (table 1).
The variability of III Zw 2 was photometrically monitored in optical
bands at Yunnan Observatories, making use of the 2.4m telescope and
the 1.02m telescope (table 2).
III Zw 2 is included in the Owens Valley Radio Observatory (OVRO) 40m
telescope monitoring program (Richards+, 2015, J/ApJS/194/29).
III Zw 2 is also included in the Monitoring of Jets in AGNs With VLBA
Experiments (MOJAVE) program (Lister et al. 2009, J/AJ/138/1874).
Recently, radio data of III Zw 2 from the MOJAVE program have been
published, including core and jet light curves, as well as jet motion
features (Lister et al. 2016AJ....152...12L 2016AJ....152...12L).
Objects:
-------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------
00 10 31.01 +10 58 29.5 III Zw 2 = Mrk 1501
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 93 8 Swift results
table2.dat 21 67 The multi-bands photometric data
from Yunnan Observatories
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See also:
J/A+A/587/A112 : Long term R and V band monitoring of AGN (Taris+, 2016)
J/ApJ/810/L9 : 1.5Jy MOJAVE AGN sample and 3FGL data (Lister+, 2015)
J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015)
J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)
J/MNRAS/441/1899 : Fermi bright blazars (Fuhrmann+, 2014)
J/MNRAS/439/690 : Optical/γ-ray variability in blazars (Hovatta+, 2014)
J/other/Sci/338.1445 : Relativistic jets from BH systems (Nemmen+, 2012)
J/A+A/541/A160 : Planck + X/γ observations of blazars (Giommi+, 2012)
J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)
J/ApJ/753/104 : AGN identifications from AKARI and Swift (Matsuta+, 2012)
J/ApJ/744/84 : Combined sample of radio-loud AGNs at 408MHz (Yuan+, 2012)
J/ApJ/742/66 : New Fermi/LAT extragalactic sources (Teng+, 2011)
J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)
J/ApJ/711/284 : Galaxy Zoo: AGN host galaxies (Schawinski+, 2010)
J/ApJ/710/764 : Extended radio emission in MOJAVE blazars (Kharb+, 2010)
J/A+A/520/A47 : Blazars in the Swift-BAT hard X-ray sky (Maselli+, 2010)
J/A+A/495/691 : Multifrequency cat. of blazars, Roma-BZCAT (Massaro+, 2009)
J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)
J/ApJ/701/587 : Deep HST H-band survey. II. QUEST QSOs (Veilleux+, 2009)
J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)
J/ApJS/171/376 : MOJAVE. III. VLA 1.4GHz images (Cooper+, 2007)
J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)
J/ApJ/645/856 : Beamed radio-intermediate quasars (Wang+, 2006)
J/AJ/131/1262 : Circ. polarization images at 15GHz of AGN jets (Homan+, 2006)
J/AJ/130/1418 : AGN jet kinematics (Jorstad+, 2005)
J/ApJ/609/539 : Kinematics of parsec-scale radio jets (Kellermann+, 2004)
J/ApJ/590/73 : RASS AGN sample. II. (Xu+, 2003)
J/ApJS/145/199 : Opt. spectroscopic atlas of low-redshift AGN (Marziani+, 2003)
J/ApJS/123/79 : Third EGRET catalog (3EG) (Hartman+, 1999)
J/A+AS/136/455 : BVRI photometry of 3 BL Lac objects (Bai+, 1999)
J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)
J/ApJ/269/352 : Quasar evolution (Schmidt+, 1983)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 I011 --- ObsID Swift observation ID
13- 23 A11 --- Date UT date of the observation
25- 28 F4.2 --- gamma [1.4/2] X-ray photon index ΓX
30- 33 F4.2 --- e_gamma Negative uncertainty on gamma
35- 38 F4.2 --- E_gamma Positive uncertainty on gamma
40- 43 F4.2 10-14W/m2 Fx [0.7/1.8] Unabsorbed 0.5-10keV X-ray fluxes;
in units of 10-11erg/cm2/s (1)
45- 48 F4.2 10-14W/m2 e_Fx Negative uncertainty on Fx
50- 53 F4.2 10-14W/m2 E_Fx Positive uncertainty on Fx
55- 58 F4.2 mJy Fv [2/3.7]? Swift/UVOT V-band flux;
absorption corrected (2)
60- 63 F4.2 mJy e_Fv ? Fv uncertainty
65- 68 F4.2 mJy FUW1 [0.7/2.1]? Swift/UVOT UVW1 flux;
absorption corrected (2)
70- 73 F4.2 mJy e_FUW1 ? FUW1 uncertainty
75- 78 F4.2 mJy FUM2 [0.5/1.7]? Swift/UVOT UVM2 flux;
absorption corrected (2)
80- 83 F4.2 mJy e_FUM2 ? FUM2 uncertainty
85- 88 F4.2 mJy FUW2 [0.5/1.7]? Swift/UVOT UVW2 flux;
absorption corrected (2)
90- 93 F4.2 mJy e_FUW2 ? FUW2 uncertainty
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Note (1): The absorption column density for estimation of X-ray flux is
constrained as 3.96-2.22+2.23x1020cm-2, with χ2/dof
of 211.0/216.
Note (2): The extinction magnitudes in four UVOT bands are calculated as:
AV=0.275, AUW1=0.582, AUM2=0.820, AUW2=0.718.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 d MJD Observation date; JD-2400000.5
10- 14 F5.2 mag mag [14.1/16.8] Nightly average magnitude (1)
16- 19 F4.2 mag e_mag [0.01/0.09] Uncertainty in mag
21 A1 --- Band Photometric band (B, R or I)
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Note (1): The correction for the interstellar extinction has been already
performed.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Nov-2016