HI Observations of Early-Type Galaxies

M.S. del Rio; E. Brinks; P. Carral; J. Cepa

HI Observations of Early-Type Galaxies

M.S. del Rio, E. Brinks, P. Carral, J. Cepa

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Abstract

We present high resolution (15") HI observations of the S0 galaxy NGC 404. We derive an HI mass of MHi = 6.7 x 10???, in good agreement with previous measurements. The HI is distributed in a broad annulus (a doughnut) and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200".

Original language	English
Title of host publication	In: Procs of Star Formation in Early Type Galaxies, ASP Conference Series 163
Publisher	Astronomical Society of the Pacific
Pages	95-101
ISBN (Print)	1-886733-84-8
Publication status	Published - 1999

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@inproceedings{0823260313d348b7862cdb3192ec43fb,

title = "HI Observations of Early-Type Galaxies",

abstract = "We present high resolution (15{"}) HI observations of the S0 galaxy NGC 404. We derive an HI mass of MHi = 6.7 x 10???, in good agreement with previous measurements. The HI is distributed in a broad annulus (a doughnut) and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200{"}.",

author = "{del Rio}, M.S. and E. Brinks and P. Carral and J. Cepa",

year = "1999",

language = "English",

isbn = "1-886733-84-8",

pages = "95--101",

booktitle = "In: Procs of Star Formation in Early Type Galaxies, ASP Conference Series 163",

publisher = "Astronomical Society of the Pacific",

address = "United States",

}

TY - GEN

T1 - HI Observations of Early-Type Galaxies

AU - del Rio, M.S.

AU - Brinks, E.

AU - Carral, P.

AU - Cepa, J.

PY - 1999

Y1 - 1999

N2 - We present high resolution (15") HI observations of the S0 galaxy NGC 404. We derive an HI mass of MHi = 6.7 x 10???, in good agreement with previous measurements. The HI is distributed in a broad annulus (a doughnut) and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200".

AB - We present high resolution (15") HI observations of the S0 galaxy NGC 404. We derive an HI mass of MHi = 6.7 x 10???, in good agreement with previous measurements. The HI is distributed in a broad annulus (a doughnut) and extends out to a diameter of 9', well beyond the optical diameter of 6'. The velocity field is regular and shows, surprisingly, a declining rotation curve. This decline is purely Keplerian, strongly suggesting that all the mass is contained within the inner 200".

M3 - Conference contribution

SN - 1-886733-84-8

SP - 95

EP - 101

BT - In: Procs of Star Formation in Early Type Galaxies, ASP Conference Series 163

PB - Astronomical Society of the Pacific

ER -

HI Observations of Early-Type Galaxies

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