Deep V and K band photometry of the host galaxy of Haro 11
Genoveva Micheva, Erik Zackrisson, Göran Östlin, Nils Bergvall
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6 pages, 4 figures, to be published in conference proceedings of "Star-forming Dwarf Galaxies: Ariadne's Thread in the Cosmic Labyrinth", Crete, Greece, in Physica Scripta
Previous studies of the host galaxy of Haro 11 have suggested an extreme red color of V-K=4.2+-0.8 which cannot be reconciled with any normal stellar population of reasonable metallicity. We present the deepest V and K band data to date of the blue compact galaxy (BCG) Haro 11 and derive a new V-K color for the host. Our new data suggest a much more modest value of V-K=2.3+-0.2, which is in the same range as V-K colors measured for several other BCGs. The new Haro 11 color is not abnormally red and can be attributed to an old metal-poor stellar population with a Salpeter initial mass function.
Type Ia supernovae (SNe Ia) have assumed a fundamental role as cosmological distance indicators since the discovery of the accelerating expansion rate of the universe. Correlations between their optical peak luminosity, the decline rate of their light curves and their optical colours allow them to be standardised, reducing their observed r.m.s scatter. Over a decade ago, the optical peak luminosity of SNe Ia was found to correlate with host galaxy stellar mass, further improving their standardisation. Since then, host galaxy properties have been used in cosmological analyses of SNe Ia and trem…
CIGaRS I: Combined simulation-based inference from type Ia supernovae and host photometry
Theoretical and Scientific Data Science, International School for Advanced Studies (SISSA), Trieste, Italy(1 理论与科学数据科学,国际先进研究学院(SISSA),意大利特里este);Institute of Cosmos Sciences (ICC), University of Barcelona, Barcelona, Spain(2 大学巴塞罗那宇宙科学研究所(ICC),西班牙巴塞罗那);Department of Physics, Imperial College London, London, UK(3 物理系,伦敦帝国理工学院,英国伦敦);Institute for Fundamental Physics of the Universe (IFPU), Trieste, Italy(4 宇宙基本物理研究所(IFPU),意大利特里este);Italian Research Center on High-Performance Computing, Big Data and Quantum Computing (ICSC), Casalecchio di Reno, Italy(5 意大利高性能计算、大数据和量子计算研究中心(ICSC),意大利Casalecchio di Reno);Catalan Institution for Research and Advanced Studies (ICREA), Barcelona, Spain(6 哥伦布研究与高级研究机构(ICREA),西班牙巴塞罗那)