Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

R. W. Schmidt; T. Kundic; U. L. Pen; E. L. Turner; J. Wambsganss; L. E. Bergeron; W. N. Colley; C. Corson; N. C. Hastings; T. Hoyes; D. C. Long; K. A. Loomis; S. Malhotra; J. E. Rhoads; K. Z. Stanek

doi:10.1051/0004-6361:20020957

Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

R. W. Schmidt, T. Kundic, U. L. Pen, E. L. Turner, J. Wambsganss, L. E. Bergeron, W. N. Colley, C. Corson, N. C. Hastings, T. Hoyes, D. C. Long, K. A. Loomis, S. Malhotra, J. E. Rhoads, K. Z. Stanek

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17 Scopus citations

Abstract

We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (≳100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Woźniak et al. 2000a).

Original language	English (US)
Pages (from-to)	773-779
Number of pages	7
Journal	Astronomy and Astrophysics
Volume	392
Issue number	3
DOIs	https://doi.org/10.1051/0004-6361:20020957
State	Published - Sep 2002
Externally published	Yes

Keywords

Cosmology: observations
Dark matter
Gravitational lensing
Quasars: individual: Q2237+0305

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1051/0004-6361:20020957

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Schmidt, R. W., Kundic, T., Pen, U. L., Turner, E. L., Wambsganss, J., Bergeron, L. E., Colley, W. N., Corson, C., Hastings, N. C., Hoyes, T., Long, D. C., Loomis, K. A., Malhotra, S., Rhoads, J. E., & Stanek, K. Z. (2002). Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998. Astronomy and Astrophysics, 392(3), 773-779. https://doi.org/10.1051/0004-6361:20020957

Schmidt, RW, Kundic, T, Pen, UL, Turner, EL, Wambsganss, J, Bergeron, LE, Colley, WN, Corson, C, Hastings, NC, Hoyes, T, Long, DC, Loomis, KA, Malhotra, S, Rhoads, JE & Stanek, KZ 2002, 'Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998', Astronomy and Astrophysics, vol. 392, no. 3, pp. 773-779. https://doi.org/10.1051/0004-6361:20020957

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title = "Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998",

abstract = "We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (≳100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Wo{\'z}niak et al. 2000a).",

keywords = "Cosmology: observations, Dark matter, Gravitational lensing, Quasars: individual: Q2237+0305",

author = "Schmidt, {R. W.} and T. Kundic and Pen, {U. L.} and Turner, {E. L.} and J. Wambsganss and Bergeron, {L. E.} and Colley, {W. N.} and C. Corson and Hastings, {N. C.} and T. Hoyes and Long, {D. C.} and Loomis, {K. A.} and S. Malhotra and Rhoads, {J. E.} and Stanek, {K. Z.}",

year = "2002",

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doi = "10.1051/0004-6361:20020957",

language = "English (US)",

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TY - JOUR

T1 - Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

AU - Schmidt, R. W.

AU - Kundic, T.

AU - Pen, U. L.

AU - Turner, E. L.

AU - Wambsganss, J.

AU - Bergeron, L. E.

AU - Colley, W. N.

AU - Corson, C.

AU - Hastings, N. C.

AU - Hoyes, T.

AU - Long, D. C.

AU - Loomis, K. A.

AU - Malhotra, S.

AU - Rhoads, J. E.

AU - Stanek, K. Z.

PY - 2002/9

Y1 - 2002/9

N2 - We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (≳100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Woźniak et al. 2000a).

AB - We present a data set of images of the gravitationally lensed quasar Q2237+0305, that was obtained at the Apache Point Observatory (APO) between June 1995 and January 1998. Although the images were taken under variable, often poor seeing conditions and with coarse pixel sampling, photometry is possible for the two brighter quasar images A and B with the help of exact quasar image positions from HST observations. We obtain a light curve with 73 data points for each of the images A and B. There is evidence for a long (≳100 day) brightness peak in image A in 1996 with an amplitude of about 0.4 to 0.5 mag (relative to 1995), which indicates that microlensing has been taking place in the lensing galaxy. Image B does not vary much over the course of the observation period. The long, smooth variation of the light curve is similar to the results from the OGLE monitoring of the system (Woźniak et al. 2000a).

KW - Cosmology: observations

KW - Dark matter

KW - Gravitational lensing

KW - Quasars: individual: Q2237+0305

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JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

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Optical monitoring of the gravitationally lensed quasar Q2237+0305 from APO between June 1995 and January 1998

Abstract

Keywords

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