The Hubble Legacy Archive ACS Grism Data

M. Kuemmel; P. Rosati; R. Fosbury; J. Haase; R. N. Hook; H. Kuntschner; M. Lombardi; A. Micol; K. K. Nilsson; F. Stoehr; J. R. Walsh

doi:10.1051/0004-6361/201116504

paper

The Hubble Legacy Archive ACS Grism Data

arXiv:1103.4703 · doi:10.1051/0004-6361/201116504

Abstract

A public release of slitless spectra, obtained with ACS/WFC and the G800L grism, is presented. Spectra were automatically extracted in a uniform way from 153 archival fields (or "associations") distributed across the two Galactic caps, covering all observations to 2008. The ACS G800L grism provides a wavelength range of 0.55-1.00 μ $m, w i t ha d i s p er s i o n o f$ 40 \ Å/ pixel $an d a r eso l u t i o n o f$ \sim 80\ Å $f or p o in t - l ik eso u r ces . T h e A C S G 800 L ima g es an d ma t c h e dd i r ec t ima g es w er er e d u ce d w i t hana u t o ma t i c p i p e l in e t ha t han d l es a l l s t e p s f r o ma r c hi v er e t r i e v a l, a l i g nm e n t an d a s t r o m e t r i cc a l ib r a t i o n, d i r ec t ima g eco mbina t i o n, c a t a l o g u e g e n er a t i o n, s p ec t r a l e x t r a c t i o nan d co l l ec t i o n o f m e t a d a t a . T h e l a r g e n u mb er o f e x t r a c t e d s p ec t r a (73, 581) d e man d e d a u t o ma t i c m e t h o d s f or q u a l i t y co n t r o l an d ana u t o ma t e d c l a ss i f i c a t i o na l g or i t hm w a s t r ain e d o n t h e v i s u a l in s p ec t i o n o f se v er a l t h o u s an d s p ec t r a . T h e f ina l s am pl eo f q u a l i t y co n t r o l l e d s p ec t r ain c l u d es 47, 919 d a t a se t s (65$ 32,149 $u ni q u eo bj ec t s, w i t ham e d ian$ i_{\rm AB} $- ban d ma g ni t u d eo f 23.7, r e a c hin g 26.5 A B f or t h e f ain t es t o bj ec t s . E a c h r e l e a se dd a t a se t co n t ain ssc i e n ce - r e a d y 1 D an d 2 D s p ec t r a, a s w e l l a s m u l t i - ban d ima g ec u t o u t so f cor r es p o n d in g so u r ces an d a u se f u l p r e v i e w p a g es u mma r i s in g t h e d i r ec t an d s l i tl ess d a t a, a s t r o m e t r i c an d p h o t o m e t r i c p a r am e t er s . I n or d er t oc ha r a c t er i z e t h es l i tl esss p ec t r a, e mi ss i o n - l in e f l ux an d e q u i v a l e n tw i d t h se n s i t i v i t y o f t h e A C S d a t a w er eco m p a r e d w i t h p u b l i c g r o u n d - ba se d s p ec t r ain t h e GO O D S - S o u t h f i e l d . A n e x am pl e l i s t o f e mi ss i o n l in e g a l a x i es w i t h tw oor m or e i d e n t i f i e d l in es i s a l so in c l u d e d, co v er in g t h er e d s hi f t r an g e$ 0.2-4.6$.

Accepted for publication in Astronomy and Astrophysics; 29 pages, 16 Figures, 4 Tables in text and 3Tables in Appendix

The Hubble Legacy Archive ACS Grism Data

Abstract

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