Study of the NGC 2770 interstellar medium through Hα, millimetric and optical polarimetric data of SN 2008D and SN 2007uy |
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| Authors: | J Gorosabel A de Ugarte Postigo AJ Castro-Tirado I Agudo M Jelínek S Leon T Augusteijn JPU Fynbo MJ Michałowski D Xu P Ferrero DA Kann A LLorente M Bremer J-M Winters CC Thöne J Cepa |
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| Institution: | 1. Instituto de Astrofísica de Andalucía (IAA-CSIC), Camino Bajo de Húetor, 50, E-18008 Granada, Spain;2. INAF/Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, LC, Italy;3. Institute for Astrophysical Research, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA;4. Joint ALMA Observatory, Av. El Golf 40, Piso 18, Las Condes, Santiago de Chile, Chile;5. Nordic Optical Telescope, Apartado 474, 38700 Santa Cruz de La Palma, Spain;6. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark;g Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain;h Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38205 La Laguna, Tenerife, Spain;i Thüringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany;j Herschel Science Operations Centre, European Space Agency, Villafranca del Castillo, P.O. Box 50727, 28080 Madrid, Spain;k Institute de Radioastronomie Millimétrique (IRAM), 300 rue de la Piscine, 38406 Saint Martin d’Héres, France |
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| Abstract: | We present the preliminary results of the recent Hα narrow-band imaging carried out for NGC 2770 with the Gran Telescopio Canarias (GTC) equipped with OSIRIS. We put the polarization measurements reported in Gorosabel et al. (2010) for SN 2007uy and SN 2008D in the context of the morphological information inferred from the Hα imaging. We estimated the orientation of the interstellar polarization (ISP) at the position of SN 2007uy and, most interestingly, at the site of SN 2008D which has been subject of an intensive debate due to its possible connection with Gamma-Ray Bursts (GRBs). The Hα imaging reveals a clumpy interstellar medium (ISM) composed of hundreds of compact emitting regions, for which we determined their sizes. The derived size for the Hα emitting region coincident with SN 2008D is consistent with the ISM cell size limits imposed by Gorosabel et al. (2010) based on millimetric data. A deeper data analysis is under way and will be published elsewhere. This article represents the first attempt to study the site of a possible GRB-like event combining millimetric, polarimetric and narrow-band data. |
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| Keywords: | Supernovae Polarimetry Gamma-ray sources Gamma-Ray Bursts |
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