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J/ApJ/848/103      ∼1.5yr Swift observations of Mrk 421      (Kapanadze+, 2017)

Mrk 421 after the giant X-ray outburst in 2013. Kapanadze B., Dorner D., Romano P., Vercellone S., Kapanadze S., Tabagari L. <Astrophys. J., 848, 103-103 (2017)> =2017ApJ...848..103K (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects; X-ray sources ; Ultraviolet Keywords: BL Lacertae objects: Mrk 421 Abstract: We present the results of the Swift observations of the nearby BL Lac object Mrk421 during 2013 November-2015 June. The source exhibited a strong long-term variability in the 0.3-10keV band, with a maximum-to-minimum flux ratio of 13, and underwent X-ray flares by a factor of 1.8-5.2 on timescales of a few weeks or shorter. The source showed 48 instances of intraday flux variability in this period, which sometimes was observed within the 1 ks observational run. It was characterized by fractional amplitudes of 1.5(0.3)%-38.6(0.4)% and flux doubling/halving times of 2.6-20.1hr. The X-ray flux showed a lack of correlation with the TeV flux on some occasions (strong TeV flares were not accompanied by comparable X-ray activity and vice versa), indicating that the high-energy emission in Mrk421 was generated from an emission region more complex than a single zone. The best fits of the 0.3-10keV spectra were mainly obtained using the log-parabola model, showing a strong spectral variability that generally followed a "harder-when-brighter" trend. The position of the synchrotron spectral energy distribution peak showed an extreme range from a few eV to ∼10keV that happens rarely in blazars. Description: In this paper, we present the results related to the X-ray timing and spectral behavior of the nearby high-frequency-peaked object (HBL) source Mrk 421 (z=0.031) during 2013November-2015 June, after its giant X-ray outburst in 2013 April (e.g. Papre I: Kapanadze+ 2016, J/ApJ/831/102). We concentrate on the 0.3-10keV band observations performed with the X-ray Telescope (XRT) on board Swift. Along with these data, we have analyzed observations performed with the Ultraviolet/Optical Telescope (UVOT) and the Burst Alert Telescope (BAT) on board Swift. We also constructed light curves using the publicly available TeV (FACT), high-energy (HE, E>1MeV; Large Area Telescope (LAT) on board Fermi), optical (R and V bands of Johnson-Cousins system; different Earth-based telescopes), and radio (the Owens Valley Radio Observatory (OVRO) 40m telescope) observations. Objects: ------------------------------------------------------- RA (ICRS) DE Designation(s) ------------------------------------------------------- 11 04 27.31 +38 12 31.8 Mrk 421 = 2MAXI J1104+382 ------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 144 161 The summary of the XRT and UVOT observations in 2013 November - 2015 June table3.dat 204 67 Summary of the intraday 0.3-10keV variabilities in 2013 November - 2015 June table4.dat 131 540 The results of the XRT spectral analysis with the logparabolic model table7.dat 109 28 The results of the XRT spectral analysis with a simple PL model
See also: IX/43 : 1SXPS Swift X-ray telescope point source catalogue (Evans+ 2014) VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005) J/ApJS/232/7 : 8yr R-band photopolarimetric data of Mrk 421 (Fraija+, 2017) J/ApJ/831/102 : Swift and NuSTAR obs. of the BL Lac Mrk 421 (Kapanadze+, 2016) J/A+A/593/A91 : Mrk 421 multi-wavelength variability, 2007-2009 (Ahnen+, 2016) J/ApJS/222/6 : 4.5yr obs. of Mrk421 with ARGO-YBJ + Fermi (Bartoli+, 2016) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/A+A/578/A22 : Mrk421 in March 2010 (Aleksic+, 2015) J/A+A/576/A126 : The 2009 multiwavelength campaign on Mrk421 (Aleksic+, 2015) J/MNRAS/439/690 : Optical/γ-ray variability in blazars (Hovatta+, 2014) J/MNRAS/438/3058 : 15GHz variability of γ-ray blazars (Richards+, 2014) J/A+A/563/A57 : Long-term variability of AGN at hard X-rays (Soldi+, 2014) J/ApJS/209/14 : The Swift/BAT hard X-ray transient monitor (Krimm+, 2013) J/A+A/559/A75 : 43GHz observation of the blazar Mrk 421 (Blasi+, 2013) J/A+A/548/A79 : INTEGRAL-OMC opt. variable sources (Alfonso-Garzon+, 2012) J/A+A/545/A117 : Monitoring of Mrk 421 at 15 and 24 GHz (Lico+, 2012) J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011) J/AJ/137/5022 : Variability of radio-bright BL Lac objects (Nieppola+, 2009) J/ApJ/663/320 : IR-through-UV extinction curve (Fitzpatrick+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 I11 --- obsID [31202141/92204008] Observation identifier 13- 22 A10 "Y/M/D" st.date UTC date of observation start 24- 31 A8 "h:m:s" st.time UTC time of observation start 33- 42 A10 "Y/M/D" end.date UTC date of observation end 44- 51 A8 "h:m:s" end.time UTC time of observation end 53- 57 I5 s Exp [22/10000] Exposure time 59- 67 F9.3 d MJD Modified Julian date of the observation start 69- 73 F5.2 ct/s XRT [7/100] Observation-binned 0.3-10keV count rate 75- 78 F4.2 ct/s e_XRT [0.08/1.2] Uncertainty in XRT 80- 84 F5.2 mag uvw1mag [11/12.1]? De-reddened Swift/UVOT uvw1 band magnitude 86- 89 F4.2 mag e_uvw1mag [0.03/0.2]? Uncertainty in uvw1mag 91- 95 F5.2 mJy Fuvw1 [13.2/33.4]? De-reddened Swift/UVOT uvw1 band flux density 97-100 F4.2 mJy e_Fuvw1 [0.05/1.3]? Uncertainty in Fuvw1 102-106 F5.2 mag uvm2mag [11/12.2]? De-reddened Swift/UVOT uvm2 band magnitude 108-111 F4.2 mag e_uvm2mag [0.03/0.2]? Uncertainty in uvm2mag 113-117 F5.2 mJy Fuvm2 [10.8/29.1]? De-reddened Swift/UVOT uvm2 band flux density 119-122 F4.2 mJy e_Fuvm2 [0.1/0.5]? Uncertainty in Fuvm2 124-128 F5.2 mag uvw2mag [11/12]? De-reddened Swift/UVOT uvw2 band magnitude 130-133 F4.2 mag e_uvw2mag [0.03/0.2]? Uncertainty in uvw2mag 135-139 F5.2 mJy Fuvw2 [11.7/28]? De-reddened Swift/UVOT uvw2 band flux density 141-144 F4.2 mJy e_Fuvw2 [0.1/1.2]? Uncertainty in Fuvw2
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 F4.1 --- Sig [99.5/99.9] Intra-day Variability Significance (1) 6- 16 I11 --- obsID1 [31202142/92204003] First observation identifier (2) 18- 28 I11 --- obsID2 [35014107/92204004]? Last observation identifier (2) 30- 32 A3 --- Orbit Orbit of obsID1, Or# (2) 34- 43 A10 "Y/M/D" Date1 UT Date of observation 1 (2) 45- 54 A10 "Y/M/D" Date2 UT Date of observation 2 (2) 56- 60 F5.2 h Exp [0.1/24] Total length of the particular observation (2) 62- 69 F8.3 --- chi2 [1.9/3325.6] Reduced χ2 parameter 71- 72 I2 --- DOF [1/24] Fit degrees of freedom 74- 78 A5 --- ORS Orbit segment (2) 80- 84 F5.2 % Fvar [1.4/38.6] Fractional variability amplitude 86- 88 F3.1 % e_Fvar [0.2/1.4] Uncertainty in Fvar 90- 93 F4.2 --- aMin [1.7/2.6]? Min photon index at the energy E1 in LP model (3) 95-100 F6.2 --- e_aMin [0.01/0.3]? Uncertainty in aMin 102-105 F4.2 --- aMax [1.8/2.7]? Max photon index at the energy E1 in LP model (3) 107-110 F4.2 --- e_aMax [0.01/0.03]? Uncertainty in aMax 112-115 F4.2 --- GamMin [1.8/2.5]? Min photon index in PL model (3) 117-120 F4.2 --- e_GamMin [0.01/0.02]? Uncertainty in GammaMin 122-125 F4.2 --- GamMax [2/2.4]? Max photon index in PL model (3) 127-130 F4.2 --- e_GamMax [0.02]? Uncertainty in GammaMax 132-135 F4.2 --- bMin [0.08/0.4]? Min curvature parameter in LP model 137-140 F4.2 --- e_bMin [0.02/0.07]? Uncertainty in bMin 142-145 F4.2 --- bMax [0.1/0.5]? Max curvature parameter in LP model 147-150 F4.2 --- e_bMax [0.03/0.08]? Uncertainty in bMax 152-156 F5.3 keV EpMin [0.009/7.3]? Min position of the SED peak in LP model 158-162 F5.3 keV e_EpMin [0.004/0.5]? Uncertainty in EpMin 164-167 F4.2 keV EpMax [0.09/9.2]? Max position of the SED peak in LP model 169-172 F4.2 keV e_EpMax [0.03/0.7]? Uncertainty in EpMax 174-181 F8.3 --- HRMin [0.2/1.1]? Minimum hardness ratio 183-190 F8.3 --- e_HRMin [0.01/0.04]? Uncertainty in HRMin 192-198 F7.3 --- HRMax [0.2/1.2]? Maximum hardness ratio 200-204 F5.3 --- e_HRMax [0.009/0.2]? Uncertainty in HRMax
Note (1): Intra-day 0.3-10keV variability (IDV), defined as a flux change with 99.9% confidence within a day (the threshold generally used for this purpose; see, e.g., Andruchow+ 2005A&A...442...97A) using the χ2-statistics. Confidences of 99.9 and 99.5 are given in the table. Note (2): The total exposure used for intra-day 0.3-10keV variability (IDV) calculations can segment a single obsID or span multiple obsIDs. The columns that define the exposure for calculating IDVs are: obsID1 = The first observation identifier; obsID2 = The last observation identifier; Or1 = Which orbit of obsID1 used for IDV; Date1 = Min range of observation UT date; Date2 = Max range of observation UT date; Exp = Total exposure length in hours, including intervals between obsIDs; ORS = That segment, in seconds, of Orbit or obsID1 used for IDV. If the entire orbit was used then ORS = Orbit. Note (3): When only one spectrum is available for the particular observation, only a single value is provided for each spectral parameters instead of a range.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 11 I11 --- obsID [31202141/94204006] Observation identifier 13- 25 A13 --- ORS Orbit/Segment code for model fit (G1) 27- 30 F4.2 --- a [1.7/2.7] Model parameter, photon index at the energy E1 32- 35 F4.2 --- e_a [0.01/0.03] Uncertainty in a 37- 40 F4.2 --- b [0.08/0.5] Model parameter, curvature parameter 42- 45 F4.2 --- e_b [0.03/0.08] Uncertainty in b 47- 51 F5.3 keV Ep [0.005/9.2] Model parameter, position of the SED peak 53- 57 F5.3 keV e_Ep [0.003/0.7] Uncertainty in Ep 59- 63 F5.3 --- K [0.06/1.8] Model parameter, normalization factor 65- 69 F5.3 --- e_K [0.001/0.04] Uncertainty in K 71- 75 F5.3 --- chi2 [0.8/1.2] Reduced χ^2 parameter 77- 79 I3 --- DOF [12/276] Fit degrees of freedom 81- 86 F6.3 [mW/m2] logFS [-9.7/-8.7] Log unabsorbed 0.3-2 keV Flux 88- 92 F5.3 [mW/m2] e_logFS [0.004/0.009] Uncertainty in logFS 94-100 F7.3 [mW/m2] logFH [-10.3/-0.1] Log unabsorbed 2-10 keV Flux 102-106 F5.3 [mW/m2] e_logFH [0.002/0.03] Uncertainty in logFH 108-113 F6.3 [mW/m2] logFT [-9.9/-8.5] Log unabsorbed 0.3-10 keV Flux 115-119 F5.3 [mW/m2] e_logFT [0.004/0.07] Uncertainty in logFH 121-125 F5.3 --- HR [0.2/1.2] Hardness ratio (G2) 127-131 F5.3 --- e_HR [0.008/0.2] Uncertainty in HR
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 11 I11 --- obsID [35014092/35014210] Observation identifier 13- 25 A13 --- ORS Orbit/Segment code for model fit (G1) 27- 30 F4.2 --- Gamma [1.8/2.8] Photon index in PL model 32- 35 F4.2 --- e_Gamma [0.01/0.02] Uncertainty in Gamma 37- 41 F5.3 --- K [0.04/0.5] Normalization 43- 47 F5.3 --- e_K [0.001/0.02] Uncertainty in K 49- 53 F5.3 --- chi2 [0.8/1.2] Reduced χ2 parameter 55- 57 I3 --- DOF [106/276] Fit degrees of freedom 59- 64 F6.3 [mW/m2] logFS [-9.8/-8.9] Log unabsorbed 0.3-2 keV Flux 66- 70 F5.3 [mW/m2] e_logFS [0.004/0.008] Uncertainty in logFS 72- 78 F7.3 [mW/m2] logFH [-10.4/-8.9] Log unabsorbed 2-10 keV Flux 80- 84 F5.3 [mW/m2] e_logFH [0.009/0.02] Uncertainty in logFH 86- 91 F6.3 [mW/m2] logFT [-9.7/-8.6] Log unabsorbed 0.3-10 keV Flux 93- 97 F5.3 [mW/m2] e_logFT [0.005/0.007] Uncertainty in logFH 99-103 F5.3 --- HR [0.2/1.1] Hardness ratio (G2) 105-109 F5.3 --- e_HR [0.009/0.04] Uncertainty in HR
Global notes: Note (G1): This column contains the "orbit" (Or#) and "segment" (S#) in seconds (#s) of that orbit used in the fit. Note (G2): Hardness ratio is calculated as a ratio of unabsorbed 2-10keV to 0.3-2keV fluxes.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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