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Proposal Identification No.:

A2196

Date Received:

2006-Jan-30 13:17:10

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Prop osal Title: Regular Astronomy Spectroscopy Extragalactic 96 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 between black hole growth and galaxy formation. Current research on this problem has been closely guided by the discovery of a tight empirical correlation between black hole mass and the stellar velocity dispersion of the bulge of the host galaxy. However, we do not know how and when this MBH - relation was established. As a first step toward addressing this fundamental problem, we must establish whether the MBH - relation holds in active galaxies (i.e., in systems whose black holes are actively accreting) and whether it depends systematically on black hole mass and accretion rate. To bypass the significant difficulties of detecting the AGN host in the optical, we propose an alternative strategy of measuring H I linewidths, taking advantage of the well-established fact that the bulge velocity dispersion correlates well with the rotational velocity of the disk. We propose 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 spectroscopy and host galaxy sizes and inclination angles from optical imaging. This survey will allow us to study, comprehensively for the first time, the MBH - 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. The feasibility of this project has already been demonstrated on a subset of 22 objects observed during the last semester. Here we request time to complete the rest of the survey.

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. Part of the observing run. X Queue Observing X

No Maybe Yes

Instrument Setup
1


L-wide Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned
1220-1420

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

2