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A Catalogue of Molecular Hydrogen Emission-Line Objects (MHOs) in YSO Outflows

A Catalogue of Molecular Hydrogen Emission-Line Objects (MHOs) in YSO Outflows. C.J. Davis 1 , R. Gell 1,2 , T.Khanzadyan 3 , M.D. Smith 4. 1 UKIRT/Joint Astronomy Centre, Hawaii, USA, 2 University of Victoria, Canada,

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A Catalogue of Molecular Hydrogen Emission-Line Objects (MHOs) in YSO Outflows

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  1. A Catalogue of Molecular Hydrogen Emission-Line Objects (MHOs) in YSO Outflows C.J. Davis1, R. Gell1,2, T.Khanzadyan3, M.D. Smith4 1UKIRT/Joint Astronomy Centre, Hawaii, USA, 2University of Victoria, Canada, 3National University of Ireland, Galway, 4CAPS, University of Kent, U.K. We have compiled an on-line catalogue of all know Molecular Hydrogen emission-line Objects (MHOs) in outflows from young stars. These are essentially the near-IR/H2 counterparts of Herbig-Haro (HH) Objects; indeed, many of the objects in our catalogue are also detected in the optical and have HH designations. With guidance from the IAU Working Group on Designations we have adopted a scheme that simply lists objects sequentially, although MHOs are grouped by region. The acronym “MHO” has been approved by the IAU Registry and appears in the Reference Dictionary of Nomenclature of Celestial Objects. Much like the HH catalogue, we label “groups of knots” or whole outflows, rather than individual condensations. Currently there are almost 1000 MHOs in the catalogue. Our aim is to add new discoveries to the catalogue as these are made; we hope that observers will support this venture by submitting new objects for inclusion in the database and by seeking an MHO designation for each object prior to publication. Note that the MHO catalogue will shortly appear in popular on-line databases such as Simbad and Vizier; an MHO catalogue publication is also pending. The catalogue is available from http://www.jach.hawaii.edu/UKIRT/MHCat/. The main MHO directory table [1] defines the regions being used and points to CO maps of the Milky Way where each region is marked [2]. The MHO directory also points to individual tables listing all MHOs in a given region - e.g. Perseus [3]. These tables list MHO coordinates, cite past references, and present a small gif image of each object. A search tool [4] may also be used to query the catalogue for objects within a specified radius of a given coordinate. Please see the above web-site for further details or contact Chris Davis at c.davis@jach.hawaii.edu.. 1 2 3 4

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