Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/HotagA2121tp.pdf Дата изменения: Tue Oct 18 06:52:08 2005 Дата индексирования: Sat Dec 22 20:07:01 2007 Кодировка: Поисковые слова: active galaxy

Proposal Identification No.:

A2121

Date Received:

2005-May-26 13:05:41

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: Regular Astronomy Spectroscopy Extragalactic 125 Hours

HI Emission Profiles in AGN Hosts: A New Strategy to Test the Black Hole-Host

Galaxy Paradigm
ABSTRACT:
Recent surveys of black holes in the centers of nearby galaxies strongly suggest a close connection b etween black hole growth and galaxy formation. Current research on this problem has b een closely guided by the discovery of a tight empirical correlation b etween black hole mass and the stellar velo city disp ersion of the bulge of the host galaxy. However, we do not know how and when this M-sigma relation was established. As a first step toward addressing this fundamental problem, we must establish whether the M-sigma relation holds in active galaxies (i.e., in systems whose black holes are actively accreting) and whether it dep ends systematically on black hole mass and accretion rate. To bypass the significant difficulties of detecting the AGN host in the optical, we prop ose an alternative strategy of measuring H I linewidths, taking advantage of the well-established fact that the bulge velo city disp ersion correlates well with the rotational velo city of the disk. We prop ose to obtain sensitive H I measuments (fluxes and linewidths) for a sample of 97 broad-line AGNs (Seyfert 1s and quasars) selected from SDSS, for which we have estimates of black hole masses and accretion rates from optical sp ectroscopy and host galaxy sizes and inclination angles from optical imaging. This survey will allow us to study, comprehensively for the first time, the M-sigma relation in AGNs. The H I data will additionally yield very useful information on the gas content of these systems, which is relevant to understanding AGN fueling.

Name Luis C. Ho

Institution Carnegie Observatories

E-mail lho@ociw.edu

Phone 626 304 0248

Student no

Service Observing Request

Remot e Observing Request

None All of the observing run. X Part of the observing run. Queue Observing X

No Maybe Yes

Instrument Setup
L-wide 1


Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1260-1420

This proposal requires coordination with Punta Salinas radar within the band 1222-1381 MHz.. This proposal requires coordination with GPS L3 at 1381 MHz.

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