The small-scale structure in interstellar Hi: a resolvable puzzle

Deshpande, A.A.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/2228

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DC Field	Value	Language
dc.contributor.author	Deshpande, A.A.	-
dc.date.accessioned	2007-04-03T10:40:56Z	-
dc.date.available	2007-04-03T10:40:56Z	-
dc.date.issued	2000-09	-
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2000, Vol.317, p199-204.	en
dc.identifier.issn	0035-8711	-
dc.identifier.uri	http://hdl.handle.net/2289/2228	-
dc.description	Restricted Access. An open access version is available at NASA ADS (alternative location).	en
dc.description.abstract	During the past decade or so, measurements of Galactic Hi absorption using VLBI against extragalactic sources, as well as multi-epoch observations in pulsar directions, have detected small-scale transverse variations corresponding to tens of au at the distance of the absorbing matter. Hitherto these measurements have been interpreted as small-scale structure in the Hi distribution with densities nHi~104-105cm-3, orders of magnitude greater than those of the pc-scale structure. Naturally, it is difficult to imagine how such structures could exist in equilibrium with other components of the ISM. In this paper we show that structure on all scales contributes to the differences on neighbouring lines of sight, and that the observed differences can be accounted for by a natural extension of the distribution of irregularities in the distribution of Hi opacities at larger scales, using a single power law. This, in our opinion, should put an end to the decades-long puzzle of the so-called small-scale structure in Hi and other species in the Galaxy.	en
dc.format.extent	8338 bytes	-
dc.format.mimetype	application/pdf	-
dc.language.iso	en	en
dc.publisher	Blackwell Publishing for the Royal Astronomical Society	en
dc.relation.uri	http://adsabs.harvard.edu/cgi-bin/bib_query?2000MNRAS.317..199D	en
dc.relation.uri	http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000MNRAS.317..199D&link_type=ARTICLE&db_key=AST	en
dc.rights	(2000) Blackwell Publishing for the Royal Astronomical Society	en
dc.subject	Pulsars	en
dc.subject	ISM: CLOUDS	en
dc.subject	ISM: MOLECULES	en
dc.subject	ISM: STRUCTURE	en
dc.subject	RADIO LINES: ISM	en
dc.title	The small-scale structure in interstellar Hi: a resolvable puzzle	en
dc.type	Article	en
Appears in Collections:	Research Papers (A&A)

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