Zobrazeno 1 - 10
of 71
pro vyhledávání: '"Luis J. Goicoechea"'
Publikováno v:
The Astrophysical Journal, Vol 955, Iss 2, p 140 (2023)
The gravitational lens system PS J0147+4630 (Andromeda’s Parachute) consists of four quasar images ABCD and a lensing galaxy. We obtained r -band light curves of ABCD in the 2017−2022 period from monitoring with two 2 m class telescopes. Applying
Externí odkaz:
https://doaj.org/article/f2ca08729b174abcb9df1910d4608e51
Publikováno v:
Advances in Astronomy, Vol 2010 (2010)
We report on the first observational phase of the Liverpool Quasar Lens Monitoring (LQLM) project. This mainly consisted of the optical follow-up of three lensed quasars using the 2 m Liverpool Robotic Telescope. The observational subprogram started
Externí odkaz:
https://doaj.org/article/ec826a39a5964ece9839ee06412fdd70
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 496:784-800
We present a multifractal analysis of the long-term light curves of a small sample of type 1 active galactic nuclei: NGC 4151, Arp 102B, 3C 390.3, E1821+643 and NGC 7469. We aim to investigate how the degrees of multifractality of the continuum and H
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b196d141b249d2b4662e6372e998e729
https://doi.org/10.1093/mnras/staa1487
https://doi.org/10.1093/mnras/staa1487
Autor:
Christopher W. Morgan, Vyacheslav N. Shalyapin, Matthew A. Cornachione, Alexey V. Sergeyev, Luis J. Goicoechea
Publikováno v:
Astronomy & Astrophysics. Vol. 646, February 2021. A165
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
We studied the accretion disc structure in the doubly imaged lensed quasar SDSS J1339+1310 using $r$-band light curves and UV-visible to near-IR (NIR) spectra from the first 11 observational seasons after its discovery. The 2009$-$2019 light curves d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67b24166500e2212e7f2e7325a182fe7
http://hdl.handle.net/10902/24778
http://hdl.handle.net/10902/24778
Publikováno v:
Astronomy & Astrophysics. Vol. 653, September 2021. A121
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
UCrea Repositorio Abierto de la Universidad de Cantabria
Universidad de Cantabria (UC)
We present a new and very fast method for producing microlensing magnification maps at high optical depths. It is based on the combination of two approaches: (a) the two-dimensional Poisson solver for a deflection potential and (b) inverse polygon ma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8196b05e61e7c8bcd5351f8628653136
Autor:
Christopher W. Morgan, Trudy Tilleman, Vyacheslav N. Shalyapin, Luis J. Goicoechea, S. E. Dahm, Hayden R. Burger, Frederick J. Vrba, Matthew A. Cornachione
We present a microlensing analysis of updated light curves in three filters, $g$--band, $r$--band, and $H$--band, for the gravitationally lensed quasars Q0957+561 and SBS0909+532. Both systems display prominent microlensing features which we analyze
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::21236d4b3f8e1bab2cfd3929c8a7ca41
Publikováno v:
Apj 873 117 (2019)
UCrea Repositorio Abierto de la Universidad de Cantabria
instname
UCrea Repositorio Abierto de la Universidad de Cantabria
instname
We present an $r$--band photometric monitoring of the two images A and B of the gravitationally lensed quasar SDSS J1442+4055 using the Liverpool Telescope (LT). From the LT light curves between 2015 December and 2018 August, we derive at once a time
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::497394161d8a49eb15db3b52286d95af
http://arxiv.org/abs/1903.06505
http://arxiv.org/abs/1903.06505
Autor:
Sh. A. Ehgamberdiev, Vyacheslav N. Shalyapin, B. P. Artamonov, O. A. Burkhonov, Alexey V. Sergeyev, A. P. Zheleznyak, T. Akhunov, Luis J. Goicoechea, V. V. Bruevich, E. V. Shimanovskaya, I. M. Asfandiyarov
Publikováno v:
Astronomy & Astrophysics. 637:A89
Quasar microlensing offers a unique opportunity to resolve tiny sources in distant active galactic nuclei and study compact object populations in lensing galaxies. We therefore searched for microlensing-induced variability of the gravitationally lens
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c3201f2ebff63aa3df81a29c86620ec
https://doi.org/10.1051/0004-6361/202037902
https://doi.org/10.1051/0004-6361/202037902
Publikováno v:
ApJ 887 126 (2019)
UCrea Repositorio Abierto de la Universidad de Cantabria
instname
UCrea Repositorio Abierto de la Universidad de Cantabria
instname
Because follow-up observations of quadruple gravitational lens systems are of extraordinary importance for astrophysics and cosmology, we present single-epoch optical spectra and $r$--band light curves of PS J0147+4630. This recently discovered syste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ed8b55e21417f60383a46d5371d4f53f
https://doi.org/10.3847/1538-4357/ab5063
https://doi.org/10.3847/1538-4357/ab5063
We report the results of an optical spectroscopic follow-up of four double quasar candidates in the Sloan Digital Sky Survey (SDSS) database. SDSS J1617+3827 is most likely a lensed quasar at z = 2.079, consisting of two images with r ~ 19-21 and sep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a1a308e494079f792c4570acc02ecf3
http://arxiv.org/abs/1807.10923
http://arxiv.org/abs/1807.10923