Browsing by Author "Hempel, Maren"
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- ItemA colour-excess extinction map of the southern Galactic disc from the VVV and GLIMPSE surveys(2019) Soto, M.; Barba, R.; Minniti, D.; Kunder, A.; Majaess, D.; Nilo Castellon, J. L.; Alonso García, J.; Leone, G.; Contreras Ramos, Rodrigo Andrés; Hempel, Maren; Morelli, Lorenzo; Haikala, L.; Firpo, V.; Lucas, P.; Emerson, J. P.; Bidin, C. M.; Geisler, D.; Saito, R. K.; Gurovich, S.; Rejkuba, M.; Barbieri, M.; Román Lopes, A.; Alonso, M. V.; Baravalle, L. D.; Borissova, J.; Kurtev, R.; Milla, F
- ItemA misidentified RR Lyrae variable star in omega Centauri(2013) Navarrete Silva, Camila Andrea; Catelan, Márcio; Contreras Ramos, Rodrigo Andrés; Alonso Garcia, J.; Dekany, Istvan; Gran Merino, Felipe Eduardo; Hempel, Maren; Angeloni, Rodolfo
- ItemA New Globular Cluster in the Area of VVVX(2018) Bica, E.; Minniti, D.; Bonatto, Charles José; Hempel, Maren
- ItemCandidate star clusters toward the inner Milky Way discovered on deep-stacked K-S-band images from the VVV Survey(2017) Ivanov, Valentin D.; Piatti, Andrés E,; Beamin Muhlenbrock, Juan Carlos; Minniti, D.; Borissova, Jordanka; Kurtev, Radostin; Hempel, Maren; Saito, Roberto K
- ItemCharacterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane(2017) Minniti, D.; Dekany, Istvan; Majaess, Daniel; Palma, Tali; Pullen, Joyce; Rejkuba, Marina; Alonso-García, Javier; Catelan, Márcio; Hempel, Maren; Zoccali, Manuela; Contreras Ramos, Rodrigo Andrés; Gonzalez, Oscar A.; Irwin, Mike; Lucas, Philip W.; Saito, Roberto K.; Tissera, Patricia; Valenti, Elena
- ItemConfirmation of a galaxy cluster hidden behind the Galactic bulge using the VVV survey(2014) Coldwell, G.; Alonso, S.; Duplancic, F.; Hempel, Maren; Ivanov, V.; Minniti, D.
- ItemConfirmation of a New Metal-poor Globular Cluster in the Galactic Bulge(2018) Minniti, D.; Schlafly, E. F.; Palma, Tali; Claria, Juan J.; Hempel, Maren; Alonso-Garcia, Javier; Bica, Eduardo; Bonatto, Charles; Braga, Vittorio F.; Clementini, Gisella; Garofalo, Alessia; Gomez, Matias; Ivanov, Valentin D.; Lucas, Phill
- ItemDeep census of variable stars in a VLT/VIMOS field in Carina(2009) Pietrukowicz, Pawel; Minniti, D.; Zoccali, Manuela; Hempel, Maren; Pietrukowicz, Pawel; Minniti, D.; Zoccali, Manuela; Hempel, Maren
- ItemDeep Hubble Space Telescope Imaging of Globular Clusters toward the Galactic Bulge: Observations, Data Reduction, and Color-magnitude Diagrams(2018) Cohen, Roger E.; Mauro, Francesco; Alonso-Garcia, Javier; Hempel, Maren; Sarajedini, Ata; Ordonez, Antonio J.; Geisler, Douglas; Kalirai, Jason S.
- ItemDiscovery of a pair of classical cepheids in an invisible cluster beyond the galactic bulge(2015) Dekany, Istvan; Minniti, D.; Hajdu, G.; Alonso-Garcia, J.; Hempel, Maren; Palma, T.; Catelan, Márcio; Gieren Waiblinger, Wolfgang Paul; Majaess, D.
- ItemDiscovery of new companions to high proper motion stars from the VVV Survey(2013) Ivanov, Valentín D.; Minniti, D.; Hempel, Maren; Kurtev, Radostín; Toledo, Ignacio; Saito, Roberto K.; García, Javier Alonso; Beamin, Juan Carlos; Borissova, Jura; Catelan, Márcio; Chene, André Nicolas; Emerson, Jin; González, Óscar A.; Lucas, Phillip W.; Martín, Eduardo L.; Rejkuba, Marina; Gromadzki, Mariusz
- ItemExtinction Ratios in the Inner Galaxy as Revealed by the VVV Survey(2017) Alonso-García Javier; Minniti, D.; Catelan, Márcio; Contreras Ramos, Rodrigo Andrés; Gonzalez, Oscar A.; Hempel, Maren; Lucas Philip W.; Saito Roberto K.; Valenti Elena; Zoccali, Manuela
- ItemFSR 1716: A New Milky Way Globular Cluster Confirmed Using VVV RR Lyrae Stars(2017) Hempel, Maren; Catelan, Márcio; Carballo Bello, J. A.; Ramos, R. C.; Gran, F.; Hagdu, G.; Navarrete, C.; Zoccali, Manuela; Minniti, D.; Palma, T.; Dekany, Istvan; Rejkuba, M.; Pullen, J.; Alonso Garcia, J.; Barba, R.; Barbuy, B.; Bica, E.; Borissova, J.; Chene, A. N.; Claria, J. J.; Cohen, R. E.; Dias, B.; Emerson, J.
- ItemMilky Way demographics with the VVV survey II. Color transformations and near-infrared photometry for 136 million stars in the southern Galactic disk(2013) Soto, M.; Minniti, D.; Hempel, Maren; Toledo, Ignacio.; Soto, M.; Minniti, D.; Hempel, Maren; Toledo, Ignacio.
- ItemMilky Way demographics with the VVV survey IV. PSF photometry from almost one billion stars in the Galactic bulge and adjacent southern disk(2018) Alonso-Garcia, Javier; Saito, Roberto K.; Hempel, Maren; Minniti, D.; Pullen, Joyce; Catelan, Márcio; Contreras Ramos, Rodrigo Andrés; Cross, Nicholas J.G.; Gonzalez, Oscar A.; Zoccali, Manuela; Lucas, Philip W.; Palma, Tali; Valenti, Elena
- ItemNew galactic star clusters discovered in the disc area of the VVVX survey(2018) Borissova, J.; Ivanov, V.D.; Lucas, P.W.; Kurtev, R.; Alonso Garcia, J.; Ramírez Alegría, S.; Minniti, D.; Froebrich, D.; Hempel, Maren; Medina, N.; Chené, A.N.; Kuhn, M.A.
- ItemNew Galactic star clusters discovered in the VVV survey(2011) Borissova, J.; Minniti, D.; Catelan, Márcio; Hempel, Maren; Borissova, J.; Minniti, D.; Catelan, Márcio; Hempel, Maren
- ItemNew galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge(2014) Borissova, J.; Chene, A.; Ramirez Alegria, S.; Sharma, S.; Clarke, J.; Kurtev, R.; Negueruela, I.; Minniti, D.; Catelan, Márcio; Hempel, Maren; Marco, A.; Amigo, P.
- ItemNew VVV Survey Globular Cluster Candidates in the Milky Way Bulge(2017) Minniti, D.; Geisler, D.; Alonso, J.; Palma, T.; Beamin, J.; Borissova, J.; Catelan, Márcio; Claria, J.; Hempel, Maren; Contreras Ramos, Rodrigo Andrés; Cohen, R.; Días, B.; Fernández, J.; Gómez, M.; Ivanov, V.; Kurtev, R.
- ItemNine lensed quasars and quasar pairs discovered through spatially extended variability in Pan-STARRS(2024) Dux, Frederic; Lemon, Cameron; Courbin, Frederic; Neira, Favio; Anguita, Timo; Galan, Aymeric; Kim, Sam; Hempel, Maren; Hempel, Angela; Lachaume, RegisWe present the proof of concept of a method for finding strongly lensed quasars using their spatially extended photometric variability through difference imaging in cadenced imaging survey data. We applied the method to Pan-STARRS, starting with an initial selection of 14 107 Gaia multiplets with quasar-like infrared colours from WISE. We identified 229 candidates showing notable spatially extended variability during the Pan-STARRS survey period. These include 20 known lenses and an additional 12 promising candidates for which we obtained long-slit spectroscopy follow-up. This process resulted in the confirmation of four doubly lensed quasars, four unclassified quasar pairs, and one projected quasar pair. Only three are pairs of stars or quasar + star projections. The false-positive rate accordingly is 25%. The lens separations are between 0.81 '' and 1.24 '', and the source redshifts lie between z = 1 :47 and z = 2 :46. Three of the unclassified quasar pairs are promising dual-quasar candidates with separations ranging from 6.6 to 9.3 kpc. We expect that this technique is a particularly e fficient way to select lensed variables in the upcoming Rubin-LSST, which will be crucial given the expected limitations for spectroscopic follow-up.