Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/institute/stuc/apr07-presentations/COSUpdate.pdf Дата изменения: Tue Apr 17 22:27:13 2007 Дата индексирования: Sat Dec 22 19:36:12 2007 Кодировка:

Operated for NASA by AURA

SPACE TELESCOPE SCIENCE INSTITUTE

STUC - COS Update 13 April 2007


Agenda

SMOV-related Activities STScI Thermal-Vac Activities Calibration Philosophy Ground System and User Support Activities

Keyes ­ 13 April 2007 Slide 2 of 7


SMOV4 Activities
Successful SMOV4 "delta" requirements review by HSTP ­ March 2007
­ COS requirements expanded and updated for this review ­ No significant changes to COS requirements

SMOV activity planning (Apr-Sep 2007)
­ Mapping of requirements to programs, assignment of resources, and program description (STScI and COS IDT)

SMOV Project Review: Oct 2007 SMOV Program generation: Nov 2007 ­ July 2008
Keyes ­ 13 April 2007 Slide 3 of 7


SMOV4 Activity Timeline

1 March 2007

1 September 2007

1 March 2008

1 September 2008

2007
21 Mar Requirements Review by HSTP 1 Aug Reserved Target List Due (GTO)

2008
31 Mar 30 Jun ERO and GTO Phase II Due Balance of SMOV Phase II Due

31 Jan High Priority (alignments, etc) Phase II Due 15 Oct Activity Summary Review by HSTP

RPropoion ecept sal Descriptarns io e a

Apr-Sep Activity Summary (Phase 1) preparation STScI/IDT

11 Sep SM4 Launch
Keyes ­ 13 April 2007 Slide 4 of 7


STScI Thermal-Vac Activities
Successful TAGFLASH test conducted at COS T-V in Dec 2006
­ Exercised flashes for all gratings and wavelength settings ­ Identified modest updates to commanding due to lamp turn-on characteristics ­ Ongoing assessment and verification of OSM drifts

FUV and NUV Thermal-Vac data processed by OPUS to be ingested in MAST Initial reference file delivery from IDT prior to SMGT in July 2007

Keyes ­ 13 April 2007 Slide 5 of 7


Calibration
STScI and the COS IDT will jointly develop SMOV calibration programs All flux, wavelength, and spectral resolution standard targets will be chosen from the STScI HST calibration target list
­ Four additional faint WD standards (the FASTEX (Faint Standard Extension) stars were specifically observed with STIS in cycle 11, have been modeled to STScI requirements, and have been added as primary photometric standards in the STScI calibration database (Bohlin, Leitherer, and Finley)
Keyes ­ 13 April 2007 Slide 6 of 7


User Support and Ground System Summary
Astronomer Proposal Tools
­ Spectroscopic ETC ­ in acceptance testing - complete in April 2007 ­ Bright Object Evaluation tool ­ April 2007

COS Handbooks
­ Mini-handbook v. 3.0 : October 2006 (cycle 16 CP) ­ Instrument Handbook v. 1.0
> First draft nearing completion; distribute with cycle 17 CP

STScI COS Website : suggestions welcome
­ http://www.stsci.edu/hst/cos/

Proposal and Scheduling System
­ All science exposure and calibration commanding is complete

CALCOS (Pipeline) Development
­ Most pipeline steps tested against instrument data (screening, thermal distortion, geometrical correction, dead-time correction, flatfield, 1-d extraction, wavecal processing, etc) ­ TAGFLASH coded and partially tested - Final testing with TV II exposures
Keyes ­ 13 April 2007 Slide 7 of 7


Cosmic Origins Spectrograph
Supplementary Material

Keyes ­ 13 April 2007 Slide 8 of 7


COS Discovery Potential
Limiting flux as function of exposure time to reach S/N=10 with spectral resolution /=20,000 at 1600 е
Increasing # of objects

10
F (erg cm-2 sec-1 е-1)

-16

10 10

-15

Unexplored discovery space
QSO (z ~ 0.5) Starburst galaxies Brightest QSO (3C 273)

-14

10

-13

S S TI

OB stars in the Magellanic Clouds

0

20

40

60

80

100
Keyes ­ 13 April 2007 Slide 9 of 7

Texp (orbits)

Discovery potential

OS C

QSO (Reionization)


Cosmic Origins Spectrograph Detector Characteristics

Keyes ­ 13 April 2007 Slide 10 of 7


COS Spectral Resolution and Bandpass Summary
FUV channel
­ G130M ­ G160M ­ G140L R > 20,000 R > 20,000 R > 2,000 1150-1450 1405-1775 1230-2050

NUV channel
­ ­ ­ ­ G G G G 185M 225M 285M 230L R R R R > > > > 16,000 1700-2100 (3x35) 20,000 2100-2500 (3x35) 20,000 2500-3000 (3x41) 1,700 (most of bandpass) 1700-3200

Bright Object Aperture (BOA) resolution degraded
­ Wedge in ND filter degrades resolution by factor of ~2.5 for FUV modes and ~4 for NUV modes.
Keyes ­ 13 April 2007 Slide 11 of 7