Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.naic.edu/vscience/schedule/tpfiles/ChandolatagA2495tp.pdf Дата изменения: Wed Apr 1 19:23:16 2009 Дата индексирования: Sat Oct 17 09:56:42 2009 Кодировка: Поисковые слова: http astrokuban.info astrokuban

Proposal Identification No.:

A2495

Date Received:

2009-Mar-12 09:55:19

Technical Page
Proposal Type: General Category: Sub-Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Urgent Astronomy Spectroscopy Extragalactic 64 Hours 1

Probing Radio Source Environments via HI and OH Absorption

HI and OH measurements represent powerful probes of gas within radio galaxies. This could lie in the circumnuclear disk, putative torus or host-galaxy halo. Understanding gas distribution and kinematics is vital for studying anisotropy of the radiation field, testing the unified scheme for active galaxies, understanding the fueling of radio activity, and probing jet-cloud interactions. Absorption-line detections over a wide redshift range also provide information on the evolution of gas properties with source size (age) and cosmic epoch. Here, we propose HI-absorption observations of 13 CSS/GPS sources at 0.73 < z < 0.97, and OH-absorption measurements of 16 at 1.03 < z < 1.31. Our earlier low-z Arecibo pro ject discovered one new HI absorber, and studied previously-known absorption systems with improved resolution and sensitivity. The new Arecibo 770-MHz receiver permits extension of our study to higher redshifts via sources previously unmeasured in HI or OH.

Name Yogesh Chandola

Institution NCRA

E-mail chandola@ncra.tifr.res.in

Phone + 91 20 2571 9000

Student G

Remote Observing Request

Observer will travel to AO X Remote Observing In Absentia (instructions to operator)

Instrument Setup
705-825 Atmospheric Observation Instruments:

Sp ecial Equipment or setup:

none 1


RFI Considerations Frequency Ranges Planned
720 ­ 820

2