2015A&A...578A.121P


Query : 2015A&A...578A.121P

2015A&A...578A.121P - Astronomy and Astrophysics, volume 578A, 121-121 (2015/6-1)

San Pedro Martir observations of microvariability in obscured quasars.

POLEDNIKOVA J., EDEROCLITE A., CEPA J., DE DIEGO J.A., GONZALEZ-SERRANO J.I., BONGIOVANNI A., OTEO I., PEREZ GARCIA A.M., PEREZ-MARTINEZ R., PINTOS-CASTRO I., RAMON-PEREZ M. and SANCHEZ-PORTAL M.

Abstract (from CDS):

Fast brightness variations are a unique tool to probe the innermost regions of active galactic nuclei (AGN). These variations are called microvariability or intra-night variability, and this phenomenon has been monitored in samples of blazars and unobscured AGNs. Detecting optical microvariations in targets hidden by the obscuring torus is a challenging task because the region responsible for the variations is hidden from our sight. However, there have been reports of fast variations in obscured Seyfert galaxies in X-rays, which rises the question whether microvariations can also be detected in obscured AGNs in the optical regime. Because the expected variations are very small and can easily be lost within the noise, the analysis requires a statistical approach. We report the use of a one-way analysis of variance, ANOVA, with which we searched for microvariability. ANOVA was successfully employed in previous studies of unobscured AGNs. As a result, we found microvariable events during three observing blocks: in two we observed the same object (Mrk 477), and in another, J0759+5050. The results on Mrk477 confirm previous findings. However, since Mrk477 is quite a peculiar target with hidden broad-line regions, we cannot rule out the possibility that we have serendipitously chosen a target prone to variations.

Abstract Copyright:

Journal keyword(s): galaxies: active - quasars: general - galaxies: individual: Mrk 477 - galaxies: individual: SDSS J1430+1339 - galaxies: individual: SDSS J075+5050

CDS comments: Table 2 stars not in SIMBAD.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1639 2
2 IRAS 07559+5058 Sy2 07 59 40.9648459968 +50 50 23.961198588   16.65 16.59     ~ 35 1
3 NAME Teacup AGN Sy2 14 30 29.8820644560 +13 39 12.007458684   16.89 16.64     ~ 43 0
4 Mrk 477 Sy2 14 40 38.0960806920 +53 30 15.961505184   16.05 15.03     ~ 296 1

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2022.05.22-14:24:50

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