Journal article

WALLABY pre-pilot survey: Two dark clouds in the vicinity of NGC 1395

OI Wong, ARH Stevens, BQ For, T Westmeier, M Dixon, SH Oh, GIG Józsa, TN Reynolds, K Lee-Waddell, J Román, L Verdes-Montenegro, HM Courtois, D Pomarède, C Murugeshan, MT Whiting, K Bekki, F Bigiel, A Bosma, B Catinella, H Dénes Show all

Monthly Notices of the Royal Astronomical Society | Published : 2021

Abstract

We present the Australian Square Kilometre Array Pathfinder (ASKAP) WALLABY pre-pilot observations of two 'dark' H i sources (with H i masses of a few times 108 {M}_\odot and no known stellar counterpart) that reside within 363 kpc of NGC 1395, the most massive early-type galaxy in the Eridanus group of galaxies. We investigate whether these 'dark' H i sources have resulted from past tidal interactions or whether they are an extreme class of low surface brightness galaxies. Our results suggest that both scenarios are possible, and not mutually exclusive. The two 'dark' H i sources are compact, reside in relative isolation, and are more than 159 kpc away from their nearest H i-rich galaxy nei..

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University of Melbourne Researchers

Grants

Awarded by Horizon 2020 Framework Programme


Funding Acknowledgements

We thank the anonymous referee for a constructive review of this paper. Parts of this research was supported by the Australian Research Council Centre of Excellence for All-sky Astrophysics in 3 Dimensions (ASTRO 3D) through project number CE170100013. OIW acknowledges discussions with Elaine Sadler which helped improved this manuscript. ARHS acknowledged receipt of the Jim Buckee Fellowship at ICRAR/UWA. SHO acknowledges support from the National Research Foundation ofKorea (NRF) grant funded by the Korea government (Ministry of Science and ICT: MSIT) (No. NRF-2020R1A2C1008706). LVM and JR acknowledges financial support from the grants AYA2015-65973-C3-1-R and RTI2018096228-B-C31 (MINECO/FEDER, UE), as well as from the State Agency for Research of the Spanish MCIU through the Center of Excellence Severo Ochoa' award to the Instituto de Astrof ' isica de Andaluc ' ia (SEV-2017-0709). JR acknowledges support from the State Research Agency (AEI-MCINN) of the Spanish Ministry of Science and Innovation under the grant `The structure and evolution of galaxies and their central regions' with reference PID2019105602GB-I00/10.13039/501100011033. FB acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 -Research and Innovation Framework Programme (grant agreement No.726384/Empire). AB acknowledges support from the Centre National d'Etudes Spatiales (CNES), France. PK is partially supported by the BMBF project 05A17PC2 for DMeerKAT. This work was supported by Fundac ao para a Ci boolean AND encia e a Tecnologia (FCT) through the research grants UIDB/04434/2020 and UIDP/04434/2020. TCS acknowledges support from FCT through national funds in the form of a work contract with the reference DL 57/2016/CP1364/CT0009. The Australian SKA Pathfinder is part of the Australia Telescope National Facility which ismanaged by CSIRO. Operation of ASKAP is funded by the Australian Government with support from the National Collaborative Research Infrastructure Strategy. ASKAP uses the resources of the Pawsey Supercomputing Centre. Establishment of ASKAP, the Murchison Radio-astronomy Observatory, and the Pawsey Supercomputing Centre are initiatives of the Australian Government, with support from the Government of WesternAustralia and the Science and Industry Endowment Fund. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. This publication makes use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This project used public archival data from the Dark Energy Survey (DES). Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and AstroParticle Physics at the Ohio StateUniversity, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Projetos, Fundac ao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico and the Ministerio da Ciencia, Tecnologia e Inovac commaao, the Deutsche Forschungsgemeinschaft, and the Collaborating Institutions in the Dark Energy Survey. The Collaborating Institutions are Argonne National Laboratory, the University of California at Santa Cruz, the University of Cambridge, Centro de Investigaciones Energeticas, Medioambientales y Tecnol ' ogicas-Madrid, the University of Chicago, University College London, the DES-Brazil Consortium, the University of Edinburgh, the Eidgenossische Technische Hochschule (ETH) Zurich, Fermi NationalAccelerator Laboratory, theUniversity of Illinois atUrbanaChampaign, the Institut de Ciencies de l'Espai (IEEC/CSIC), the Institut de Fisica d'Altes Energies, Lawrence Berkeley National Laboratory, the Ludwig-Maximilians-Universitat Munchen and the associated Excellence Cluster Universe, the University of Michigan, the National Optical Astronomy Observatory, the University of Nottingham, the Ohio State University, the OzDES Membership Consortium, the University of Pennsylvania, the University of Portsmouth, SLAC National Accelerator Laboratory, Stanford University, the University of Sussex, and Texas A&M University. Based in part on observations at Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreementwith theNational Science Foundation. Data base access and other data services are provided by the NOAO Data Lab.