Flux and color variations of the quadruply imaged quasar HE 0435-1223

D. Ricci...[et al.]; J. Poels; F. Finet; P.G. Sprimont; Kennet Bomann West Harpsøe; Uffe Gråe Jørgensen; Christina Thöne

doi:10.1051/0004-6361/201016188

Flux and color variations of the quadruply imaged quasar HE 0435-1223

D. Ricci...[et al.], J. Poels, F. Finet, P.G. Sprimont, Kennet Bomann West Harpsøe, Uffe Gråe Jørgensen, Christina Thöne

11 Citationer (Scopus)

Abstract

Aims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting. Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs. Microlensing effects probably also affect the brightest "A" lensed component.

Originalsprog	Engelsk
Tidsskrift	Astronomy & Astrophysics
Vol/bind	528
Sider (fra-til)	A42
ISSN	0004-6361
DOI	https://doi.org/10.1051/0004-6361/201016188
Status	Udgivet - 1 apr. 2011

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10.1051/0004-6361/201016188

Citationsformater

@article{e84dd6254adf4c91aba60b7a3cb31307,

title = "Flux and color variations of the quadruply imaged quasar HE 0435-1223",

abstract = "Aims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting. Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs. Microlensing effects probably also affect the brightest {"}A{"} lensed component.",

author = "{Ricci...[et al.]}, D. and J. Poels and F. Finet and P.G. Sprimont and Harps{\o}e, {Kennet Bomann West} and J{\o}rgensen, {Uffe Gr{\aa}e} and Christina Th{\"o}ne",

year = "2011",

month = apr,

day = "1",

doi = "10.1051/0004-6361/201016188",

language = "English",

volume = "528",

pages = "A42",

journal = "Astronomy and Astrophysics Supplement Series",

issn = "0004-6361",

publisher = "E D P Sciences",

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TY - JOUR

T1 - Flux and color variations of the quadruply imaged quasar HE 0435-1223

AU - Ricci...[et al.], D.

AU - Poels, J.

AU - Finet, F.

AU - Sprimont, P.G.

AU - Harpsøe, Kennet Bomann West

AU - Jørgensen, Uffe Gråe

AU - Thöne, Christina

PY - 2011/4/1

Y1 - 2011/4/1

N2 - Aims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting. Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs. Microlensing effects probably also affect the brightest "A" lensed component.

AB - Aims: We present VRi photometric observations of the quadruply imaged quasarHE0435-1223, carried out with the Danish 1.54 m telescope at the La Silla Observatory. Our aim was to monitor and study the magnitudes and colors of each lensed component as a function of time. Methods. We monitored the object during two seasons (2008 and 2009) in the VRi spectral bands, and reduced the data with two independent techniques: difference imaging and point spread function (PSF) fitting. Results. Between these two seasons, our results show an evident decrease in flux by ≈ 0.2-0.4 magnitudes of the four lensed components in the three filters. We also found a significant increase (≈ 0.05-0.015) in their V - R and R - i color indices. Conclusions. These flux and color variations are very likely caused by intrinsic variations of the quasar between the observed epochs. Microlensing effects probably also affect the brightest "A" lensed component.

U2 - 10.1051/0004-6361/201016188

DO - 10.1051/0004-6361/201016188

M3 - Journal article

SN - 0004-6361

VL - 528

SP - A42

JO - Astronomy and Astrophysics Supplement Series

JF - Astronomy and Astrophysics Supplement Series

ER -

Flux and color variations of the quadruply imaged quasar HE 0435-1223

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