Query : 2004A&A...422..505G

2004A&A...422..505G - Astronomy and Astrophysics, volume 422, 505-508 (2004/8-1)

Near infrared intraday variability of Mrk 421.


Abstract (from CDS):

We report results from our monitoring of the BL Lac object Mrk 421 in the near-IR J band. The observations, aimed at studying the intraday variability (IDV) of the object, were carried out systematically over an extended (and near-continuous) period of eight nights from the 1.2m Mount Abu Infrared Telescope, India. There are limited studies for Mrk 421 in the J band for such an extended period. The observation epoch for this study (25 February-5 March 2003) was chosen to significantly overlap other concurrent studies of Mrk 421 in the X-ray/γ-ray regions being conducted using the Rossi X-ray timing explorer (RXTE) and the solar tower atmospheric Cherenkov effect experiment (STACEE). Hence these results could be useful for a multi-wavelength analysis of the variability behavior of Mrk 421. We find that Mrk 421 was quite active during the observed period and showed significant IDV and short term variability. A maximum variation of 0.89mag is seen over the entirety of the observed period. Flaring activity, with typical brightness variations of ∼0.4, are also seen on several occasions. The extent of the variability observed by us is compared with the results of other similar studies of Mrk 421 in the J band.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: individual: Mrk 421 - BL Lacertae objects: general - infrared: general

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 95884 * 11 04 18.1955431968 +38 52 05.696652828   7.354 7.137     A7V 26 0
2 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2615 1

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