Browsing by Author "Hempel, M."

Now showing items 1-16 of 16

    • A colour-excess extinction map of the southern Galactic disc from the VVV and GLIMPSE surveys 

      Soto, M.; Barbá, R.; Minniti, D.; Kunder, A.; Majaess, D.; Nilo-Castellón, J. L.; Alonso-García, J.; Leone, G.; Morelli, L.; Haikala, L.; Firpo, V.; Lucas, P.; Emerson, J. P.; Bidin, C. Moni; Geisler, D.; Saito, R. K.; Gurovich, S.; Ramos, R. Contreras; Rejkuba, M.; Barbieri, M.; Roman-Lopes, A.; Hempel, M.; Alonso, M. V.; Baravalle, L. D.; Borissova, J.; Kurtev, R.; Milla, F. (2019-09-01)
      An improved high-resolution and deep A Ks foreground dust extinction map is presented for the Galactic disc area within 295◦ ≾ l ≾ 350◦, −1.0◦ ≾ b ≾ +1.0◦. At some longitudes the map reaches up to |b| ~ 2.25◦, for a total ...

    • Core-collapse supernova explosions triggered by a quark-hadron phase transition during the early post-bounce phase 

      Fischer, T.; Sagert, I.; Pagliara, G.; Hempel, M.; Schaffner-Bielich, J.; Rauscher, T.; Thielemann, Friedrich-Karl; Kaeppeli, R.; Martinez-Pinedo, G.; Liebendoerfer, M. (2011-06)
      We explore explosions of massive stars, which are triggered via the quark-hadron phase transition during the early post-bounce phase of core-collapse supernovae. We construct a quark equation of state, based on the bag ...

    • Discovery of new globular clusters in the Sagittarius dwarf galaxy 

      Minniti, D.; Ripepi, V.; Fernández-Trincado, J. G.; Alonso-García, J.; Smith, L. C.; Lucas, P. W.; Gómez, M.; Pullen, J. B.; Garro, E. R.; Cádiz, F. Vivanco; Hempel, M.; Rejkuba, M.; Saito, R. K.; Palma, T.; Clariá, J. J.; Gregg, M.; Majaess, D. (2021-03-12)
      Context. Globular clusters (GCs) are witnesses of the past accretion events onto the Milky Way. In particular, the GCs of the Sagittarius (Sgr) dwarf galaxy are important probes of an on-going merger. Aims. Our main goal ...

    • The edge of the milky way stellar disk revealed using clump giant stars as distance indicators 

      Minniti, D.; Saito, R.K.; Alonso-Garcia, J.; Lucas, P.W.; Hempel, M. (2011)
      We use the clump giants of the disk as standard candles calibrated from Hipparcos parallaxes in order to map their distribution with two new near-infrared surveys of the Galactic plane: UKIDSS-GPS and VISTA Variables in ...

    • Hundreds of new cluster candidates in the VISTA Variables in the Vía Láctea survey DR1 

      Barba, R.H.; Roman-Lopes, A.; Nilo Castellon, J.L.; Firpo, V.; Minniti, D.; Lucas, P.W.; Emerson, J.P.; Hempel, M.; Soto, M.; Saito, R.K. (2015-09-18)
      Context. VISTA variables in the Vía Láctea is an ESO Public survey dedicated to scanning the bulge and an adjacent portion of the Galactic disk in the fourth quadrant using the VISTA telescope and its near-infrared camera ...

    • Milky Way demographics with the VVV survey III : Evidence for a great dark lane in the 157 million star bulge color-magnitude diagram 

      Minniti, D.; Saito, R.K.; Gonzalez, O. A.; Zoccali, M.; Rejkuba, M.; Alonso-Garciá, J.; Benjamin, R.; Catelan, M.; Dékány, I.; Emerson, J.P.; Hempel, M.; Lucas, P.W.; Schultheis, M. (2014-11)
      The new generation of IR surveys are revealing and quantifying Galactic features that provide an improved 3D interpretation of our own Galaxy. We present an analysis of the global distribution of dust clouds in the bulge ...

    • New Galactic star clusters discovered in the disc area of the VVVX survey 

      Borissova, J.; Ivanov, V. D.; Lucas, P. W.; Kurtev, R.; Alonso-Garcia, J.; Alegria, S. Ramirez; Minniti, D.; Hempel, M.; Medina, N.; Chene, A. N.; Kuhn, M. A. (2018-12-11)
      The "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 sq. deg towards the Galactic disk and bulge. It is well-suited to search for new ...

    • New Galactic star clusters discovered in the VVV survey 

      Borissova, J.; Bonatto, C.; Kurtev, R.; Clarke, J. R. A.; Penaloza, F.; Sale, S. E.; Minniti, D.; Alonso-Garcia, J.; Artigau, E.; Barba, R.; Bica, E.; Baume, G. L.; Catelan, M.; Chene, A. N.; Dias, B.; Folkes, S. L.; Froebrich, D.; Geisler, D.; de Grijs, R.; Hanson, M. M.; Hempel, M.; Ivanov, V. D.; Kumar, M. S. N.; Lucas, P.W.; Mauro, F.; Moni Bidin, C.; Rejkuba, M.; Saito, R. K.; Tamura, M.; Toledo, I. (2011-08)
      Context. VISTA Variables in the Via Lactea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent ...

    • New galactic star clusters discovered in the VVV survey : Candidates projected on the inner disk and bulge 

      Borissova, J.; Chené, A. N.; Ramírez Alegría, S.; Sharma, S.; Clarke, J. R. A.; Kurtev, R.; Negueruela, I.; Marco, A.; Amigo, P.; Minniti, D.; Bica, E.; Bonatto, C.; Catelan, M.; Fierro, C.; Geisler, D.; Gromadzki, M.; Hempel, M.; Hanson, M. M.; Ivanov, V. D.; Lucas, P.W.; Majaess, D.; Moni Bidin, C.; Popescu, B.; Saito, R.K. (2014-09)
      Context. VISTA Variables in the Vía Láctea (VVV) is one of six ESO Public Surveys using the 4 meter Visible and Infrared Survey Telescope for Astronomy (VISTA). The VVV survey covers the Milky Way bulge and an adjacent ...

    • Stellar variability in the VVV survey : Overview and first results 

      Catelan, M.; Minniti, D.; Lucas, P.W.; Dékány, I.; Saito, R. K.; Angeloni, R.; Alonso-García, J.; Hempel, M.; Hełminiak, K.; Jordán, A.; Ramos, R. Contreras; Navarrete, C.; Beamín, J. C.; Rojas, A. F.; Gran, F.; Lopes, C. E Ferreira; Peña, C. Contreras; Kerins, E.; Huckvale, L.; Rejkuba, M.; Cohen, R.; Mauro, F.; Borissova, J.; Amigo, P.; Eyheramendy, S.; Pichara, K.; Espinoza, N.; Navarro, C.; Hajdu, G.; Espinoza, D. N Calderón; Muro, G. A.; Andrews, H.; Motta, V.; Kurtev, R.; Emerson, J.P.; Bidin, C. Moni; Chené, A.-N. (Cambridge University Press, 2014-03-03)
      The Vista Variables in the Vía Láctea (VVV) ESO Public Survey is an ongoing time-series, near-infrared (IR) survey of the Galactic bulge and an adjacent portion of the inner disk, covering 562 square degrees of the sky, ...

    • Three galactic globular cluster candidates 

      Moni Bidin, C.; Mauro, F.; Geisler, D.; Chené, A.-N.; Minniti, D.; Catelan, M.; Hempel, M.; Valcarce, A.A.R.; Alonso-García, J.; Zoccali, M.; Valenti, E.; Carraro, G.; Valcarce, A.A.R.; Borissova, J.; Chené, A.-N.; Kurtev, R.G.; Lucas, P.W. (2011-10-27)
      Context. The census of Galactic globular clusters (GCs) is still incomplete, and about ten new objects are supposed to await discovery, hidden behind the crowded and reddened regions of the Galactic bulge and disk. Aims. ...

    • VISTA Variables in the Via Lactea (VVV) : The public ESO near-IR variability survey of the Milky Way 

      Minniti, D.; Lucas, P.W.; Emerson, J.P.; Saito, R.K.; Hempel, M.; Pietrukowicz, P.; Ahumada, A.V.; Alonso, M.V.; Alonso-Garcia, J.; Arias, J.I.; Bandyopadhyay, R.M.; Barba, R.; Barbuy, B.; Bedin, L.R.; Bica, E.; Borissova, J.; Bronfman, L.; Carraro, G.; Catelan, M.; Claria, J. J.; Cross, N.; de Grijs, R.; Dekany, I.; Drew, J.E.; Farina, C.; Feinstein, C.; Fernandez Lajus, E.; Gamen, R.C.; Geisler, D.; Gieren, W.; Goldman, B.; Gonzalez, O. A.; Gunthardt, G.; Gurovich, S.; Hambly, N.C.; Irwin, M.J.; Ivanov, V.D.; Jordan, A.; Kerins, E.; Kinemuchi, K.; Kurtev, R.; Lopez-Corredoira, M.; Maccarone, T.; Masetti, N.; Merlo, D.; Messineo, M.; Mirabel, I.F.; Monaco, L.; Morelli, L.; Padilla, N.; Palma, T.; Parisi, M.C.; Pignata, G.; Rejkuba, M.; Roman-Lopes, A.; Sale, S. E.; Schreiber, M. R.; Schroder, A.C.; Smith, M.; Sodre Jr, L.; Soto, M.; Tamura, M.; Tappert, C.; Thompson, Mark; Toledo, I.; Zoccali, M.; Pietrzynski, G. (2010)
      We describe the public ESO near-IR variability survey (VVV) scanning the Milky Way bulge and an adjacent section of the mid-plane where star formation activity is high. The survey will take 1929 h of observations with the ...

    • VVV DR1: The first data release of the Milky Way bulge and southern plane from the near-infrared ESO public survey VISTA variables in the Vía Láctea 

      Saito, R.K.; Hempel, M.; Minniti, D.; Lucas, P.W.; Rejkuba, M.; Toledo, I.; Gonzalez, O. A.; Alonso-García, J.; Irwin, M.J.; Gonzalez-Solares, E.; Hodgkin, S.T.; Lewis, J.R.; Cross, N.; Ivanov, V.D.; Kerins, E.; Emerson, J.P.; Soto, M.; Amôres, E.B.; Gurovich, S.; Dékány, I.; Angeloni, R.; Beamin, J.C.; Catelan, M.; Padilla, N.; Zoccali, M.; Pietrukowicz, P.; Moni Bidin, C.; Mauro, F.; Geisler, D.; Folkes, S.L.; Sale, S.E.; Borissova, J.; Kurtev, R.; Ahumada, A.V.; Alonso, M.V.; Adamson, A.; Arias, J.I.; Bandyopadhyay, R.M.; Barbá, R.H.; Barbuy, B.; Baume, G. L.; Bedin, L.R.; Bellini, A.; Benjamin, R.; Bica, E.; Bonatto, C.; Bronfman, L.; Carraro, G.; Chenè, A.N.; Clariá, J.J.; Clarke, J.R.A.; Contreras, C.; Corvillón, A.; de Grijs, R.; Dias, B.; Drew, J.E.; Fariña, C.; Feinstein, C.; Fernández-Lajús, E.; Gamen, R.C.; Gieren, W.; Goldman, B.; González-Fernández, C.; Grand, R. J. J.; Gunthardt, G.; Hambly, N.C.; Hanson, M. M.; Helminiak, K.G.; Hoare, M.G.; Huckvale, L.; Jordán, A.; Kinemuchi, K.; Longmore, A.; López-Corredoira, M.; Maccarone, T.; Majaess, D.; Martín, E.L.; Masetti, N.; Mennickent, R.E.; Mirabel, I.F.; Monaco, L.; Morelli, L.; Motta, V.; Palma, T.; Parisi, M.C.; Parker, Q.; Peñaloza, F.; Pietrzyski, G.; Pignata, G.; Popescu, B.; Read, M. A.; Rojas, A.; Roman-Lopes, A.; Ruiz, M.T.; Saviane, I.; Schreiber, M. R.; Schröder, A. C.; Sharma, S.; Smith, M.D.; Sodré, L.; Stead, J.; Stephens, A. W.; Tamura, M.; Tappert, C.; Thompson, Mark; Valenti, E.; Vanzi, L.; Walton, N.A.; Weidmann, W.; Zijlstra, A. (2012)
      Context. The ESO public survey VISTA variables in the Vía Láctea (VVV) started in 2010. VVV targets 562 sq. deg in the Galactic bulge and an adjacent plane region and is expected to run for about five years. Aims. We ...

    • The VVV Infrared Variability Catalog (VIVA-I) 

      Lopes, C. E. Ferreira; Cross, N. J. G.; Catelan, M.; Minniti, D.; Hempel, M.; Lucas, P. W.; Angeloni, R.; Jablonsky, F.; Braga, V. F.; Leao, I. C.; Herpich, F. R.; Alonso-Garcia, J.; Papageorgiou, A.; Pichara, K.; Saito, R. K.; Bradley, A.; Beamin, J. C.; Cortes, C.; Medeiros, J. R. De; Russell, Christopher M. P. (2020-08)
      Thanks to the VISTA Variables in the Via Lactea (VVV) ESO Public Survey it is now possible to explore a large number of objects in those regions. This paper addresses the variability analysis of all VVV point sources having ...

    • VVV-WIT-01: highly obscured classical nova or protostellar collision? 

      Lucas, P. W.; Minniti, D.; Kamble, A.; Kaplan, D. L.; Cross, N.; Dekany, I.; Ivanov, V. D.; Kurtev, R.; Saito, R. K.; Smith, L. C.; Catelan, M.; Masetti, N.; Toledo, I.; Hempel, M.; Thompson, M. A.; Peña, C. Contreras; Forbrich, J.; Krause, M.; Dale, J.; Borissova, J.; Emerson, J.P. (2020-03)
      A search of the first Data Release of the VISTA Variables in the Via Lactea (VVV) Survey discovered the exceptionally red transient VVV-WIT-01 (H-Ks=5.2). It peaked before March 2010, then faded by ~9.5 mag over the following ...

    • VVVX-Gaia Discovery of a Low Luminosity Globular Cluster in the Milky Way Disk 

      Garro, E. R.; Minniti, D.; Gómez, M.; Alonso-García, J.; Barbá, R. H.; Barbuy, B.; Clariá, J. J.; Chené, A. N.; Dias, B.; Hempel, M.; Ivanov, V. D.; Lucas, P. W.; Majaess, D.; Mauro, F.; Bidin, C. Moni; Palma, T.; Pullen, J. B.; Saito, R. K.; Smith, L.; Surot, F.; Alegría, S. Ramírez; Rejkuba, M.; Ripepi, V. (2020-10-22)
      Milky Way globular clusters (MW GCs) are difficult to identify at low Galactic latitudes because of high differential extinction and heavy star crowding. The new deep near-IR images and photometry from the VISTA Variables ...