J/ApJS/222/24 VRI LCs of BL Lac object Mrk 501 from 2010 to 2015 (Xiong+, 2016)
Multi-color optical monitoring of Mrk 501 from 2010 to 2015.
Xiong D., Zhang H., Zhang X., Yi T., Bai J., Wang F., Liu H., Zhen Y.
<Astrophys. J. Suppl. Ser., 222, 24 (2016)>
=2016ApJS..222...24X 2016ApJS..222...24X (SIMBAD/NED BibCode)
ADC_Keywords: BL Lac objects ; Photometry, VRI
Keywords: BL Lacertae objects: individual (Mrk 501) ; galaxies: active ;
galaxies: photometry
Abstract:
We have monitored the BL Lac object Mrk 501 in the optical V, R, and I
bands from 2010 to 2015. For Mrk 501, the presence of a strong host
galaxy component can affect the results of photometry. After
subtracting the host galaxy contributions, the source shows intraday
and long-term variabilities for optical flux and color indices. The
average variability amplitudes of the V, R, and I bands are 22.05%,
22.25%, and 23.82%, respectively, and the value of the duty cycle is
14.87%. A minimal variability timescale of 106 minutes is detected. No
significant time lag between the V and I bands is found on one night.
The bluer-when-brighter (BWB) trend is dominant for Mrk 501 on
intermediate, short, and intraday timescales, which supports the
shock-in-jet model. For the long timescale, Mrk 501, in different
states, can have different BWB trends. The corresponding results for
non-correcting host galaxy contributions are also presented. We have
monitored the BL Lac object Mrk 501 in the optical V, R, and I bands
from 2010 to 2015. For Mrk 501, the presence of a strong host galaxy
component can affect the results of photometry. After subtracting the
host galaxy contributions, the source shows intraday and long-term
variabilities for optical flux and color indices. The average
variability amplitudes of the V, R, and I bands are 22.05%, 22.25%,
and 23.82%, respectively, and the value of the duty cycle is 14.87%. A
minimal variability timescale of 106 minutes is detected. No
significant time lag between the V and I bands is found on one night.
The bluer-when-brighter (BWB) trend is dominant for Mrk 501 on
intermediate, short, and intraday timescales, which supports the
shock-in-jet model. For the long timescale, Mrk 501, in different
states, can have different BWB trends. The corresponding results for
non-correcting host galaxy contributions are also presented.
Description:
Our optical monitoring program of Mrk 501 was carried out with the
1.02m optical telescope located at the the Yunnan Astronomical
Observatory of China.
Our monitoring program for Mrk 501 was divided into five periods. The
first period was from 2010 April 1-3, the second was from 2012 April
22-25, the third was from 2013 April 1-4, the fourth was from 2014
April 17-May 8, and the fifth was from 2015 April 6-May 25. Excluding
the nights with bad weather and those devoted to other targets, the
actual number of observations for Mrk 501 is 29 nights.
The standard Johnson broadband filters were used. The typical
integration times were 150-300s for the I and R filters and 400s for
the V filter.
Objects:
------------------------------------------------
RA (ICRS) DE Designation(s)
------------------------------------------------
16 53 52.22 +39 45 36.6 Mrk 501 = 4C 39.49
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 39 422 Data of I Band
table3.dat 39 421 Data of R Band
table4.dat 39 379 Data of V Band
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See also:
J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)
J/A+A/573/A50 : Multiwavelength obs. of Mrk 501 in 2008 (Aleksic+, 2015)
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/ApJS/207/16 : BL Lac candidates for TeV observations (Massaro+, 2013)
J/MNRAS/435/1300 : Intranight optical variability of AGN (Goyal+, 2013)
J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)
J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)
J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)
J/ApJ/741/30 : Radio/γ-ray correlation in AGN (Ackermann+, 2011)
J/ApJ/722/L7 : Fermi/LAT detected MOJAVE AGNs (Pushkarev+, 2010)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)
J/ApJ/700/597 : FERMI LAT detected blazars (Abdo+, 2009)
J/A+A/495/691 : Multifrequency catalog of blazars, Roma-BZCAT (Massaro+, 2009)
J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)
J/A+A/472/699 : ROXA: large multi-frequency blazar sample (Turriziani+, 2007)
J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)
J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)
J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)
J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)
J/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996)
J/A+AS/109/267 : Radio to X-Ray distribution of BL Lac Objects (Giommi+, 1995)
J/A+AS/98/393 : 1Jy BL Lac Objects: Observational Data (Stickel+ 1993)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 "Y/M/D" Date Date of the Observation
13- 21 F9.3 d MJD [55287.7/57167.9] Modified Julian Date of
the observation
23- 28 F6.3 mag Imag [12.3/13.1] I band magnitude
30- 34 F5.3 mag e_Imag [0.008/0.05] RMS uncertainty in Imag
36- 39 F4.1 mJy Fhost [4.4/14] Host galaxy flux
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date Date of the Observation
13- 21 F9.3 d MJD [55287.7/57167.9] Modified Julian Date of
the observation
23- 28 F6.3 mag Rmag [13/13.8] R band magnitude
30- 34 F5.3 mag e_Rmag [0.007/0.05] RMS uncertainty in Rmag
36- 39 F4.1 mJy Fhost [4.4/13.5] Host galaxy flux
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 "Y/M/D" Date Date of the Observation
13- 21 F9.3 d MJD [55287.7/57167.9] Modified Julian Date of
the observation
23- 28 F6.3 mag Vmag [13.5/14.2] V band magnitude
30- 34 F5.3 mag e_Vmag [0.009/0.05] RMS uncertainty in Vmag
36- 39 F4.1 mJy Fhost [4.4/14] Host galaxy flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 18-Mar-2016