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J/ApJ/849/161    BVRI light curves of the BL Lac object Mrk 501    (Feng+, 2017)

Search for intra-day optical variability in Mrk 501. Feng H.-C., Liu H.T., Fan X.L., Zhao Y., Bai J.M., Wang F., Xiong D.R., Li S.K. <Astrophys. J., 849, 161 (2017)> =2017ApJ...849..161F
ADC_Keywords: BL Lac objects; Photometry, UBVRI Keywords: BL Lacertae objects: individual (Mrk 501); galaxies: active; galaxies: nuclei Abstract: We present our observations of the optical intra-day variability (IDV) in γ-ray BL Lac object Mrk 501. The observations were run with the 1.02m and 2.4m optical telescopes at Yunnan Observatories from 2005 April to 2012 May. The light curve at the R band on 2010 May 15 passes both variability tests (the F-test and the ANOVA test). A flare within the light curve on 2010 May 15 has a magnitude change of Δm=0.03±0.005stat±0.007sysmag, a darkening timescale of τd=26.7min., and an amplitude of IDV Amp=2.9%±0.7% . A decline described by 11 consecutive flux measurements within the flare can be fitted linearly with a Pearson's correlation coefficient r=0.945 at the confidence level of >99.99% . Under the assumptions that the IDV is tightly connected to the mass of the black hole, and that the flare duration, being two times τd, is representative of the minimum characteristic timescale, we can derive upper bounds to the mass of the black hole. In the case of the Kerr black hole, the timescale of Δtminob=0.89hr gives M≲109.20M, which is consistent with measurements reported in the literature. This agreement indicates that the hypothesis about M and Δtminob is consistent with the measurements/data. Description: The optical monitoring program of Mrk 501 was carried out with two telescopes: the 1.02 and 2.4m optical telescopes at Yunnan Observatories, China. For both of the two telescopes, we selected standard Johnson broadband filters to carry out the observations in the B, V, R, and I bands. During our monitoring program from 2005 to 2012, 1532 CCD frames were obtained in 50 nights. For most nights, the exposure times are 40-400s for 1.02m telescope and 10-50s for 2.4m telescope. Objects: -------------------------------------------------- RA (ICRS) DE Designation(s) -------------------------------------------------- 16 53 52.22 +39 45 36.6 Mrk 501 = LEDA 59214 -------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 95 689 The observational data for Mrk 501
See also: J/A+AS/98/393 : 1Jy BL Lac Objects: Observational Data (Stickel+ 1993) J/A+AS/116/403 : VRI photometry of stars in 12 BL Lac objects (Fiorucci+, 1996) J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998) J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999) J/ApJ/525/127 : RGB sample of BL Lacertae objects (Laurent-Muehleisen+, 1999) J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006) J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008) J/ApJ/696/580 : Properties of weak emission-line QSOs (WLQ) (Shemmer+, 2009) J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010) J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010) J/ApJS/192/12 : Photometry of the blazar PKS 0537-441 (Impiombato+, 2011) J/ApJ/761/125 : X and γ spectral indexes of Fermi blazars (Fan+, 2012) J/A+A/548/A79 : INTEGRAL-OMC optically var. sources (Alfonso-Garzon+, 2012) J/A+A/563/A57 : Long-term variability of AGN at hard X-rays (Soldi+, 2014) J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014) J/MNRAS/438/3058 : 15GHz variability of γ-ray blazars (Richards+, 2014) J/MNRAS/439/690 : Optical/γ-ray variability in blazars (Hovatta+, 2014) J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014) J/A+A/573/A50 : Multiwavelength obs. of Mrk 501 in 2008 (Aleksic+, 2015) J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015) J/ApJS/222/24 : VRI LCs of BL Lac object Mrk 501 from 2010-2015 (Xiong+, 2016) J/AZh/93/605 : AGN long-term variability (Volvach+, 2016) J/MNRAS/467/4565 : Bimodal radio variability in OVRO blazars (Liodakis+, 2017) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 F11.6 d MJD-B [3465.8/6051]? B band Modified Julian Date of observation; MJD-50000 13- 18 F6.3 mag Bmag [13.8/14.9]? Apparent B band magnitude 20- 23 F4.2 arcsec FWHM-B [1.2/4.5]? Full-Width at Half Maximum of B band aperture 25- 35 F11.6 d MJD-I [3465.8/6059]? I band Modified Julian Date of observation; MJD-50000 37- 42 F6.3 mag Imag [12/12.7]? Apparent I band magnitude 44- 47 F4.2 arcsec FWHM-I [1/5.2]? Full-Width at Half Maximum of I band aperture 49- 59 F11.6 d MJD-R [3465.8/6065] R band Modified Julian Date of observation; MJD-50000 61- 66 F6.3 mag Rmag [12.7/18.9] Apparent R band magnitude 68- 71 F4.2 arcsec FWHM-R [1.1/5.4] Full-Width at Half Maximum of R band aperture 73- 83 F11.6 d MJD-V [3465.8/6061]? V band Modified Julian Date of observation; MJD-50000 85- 90 F6.3 mag Vmag [13/14]? Apparent V band magnitude 92- 95 F4.2 arcsec FWHM-V [1.1/3.6]? Full-Width at Half Maximum of V band aperture
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-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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