Astrophys. J., 754, 17 (2012/July-3)
Spatially resolved HST grism spectroscopy of a lensed emission line galaxy at z ∼ 1.
FRYE B.L., HURLEY M., BOWEN D.V., MEURER G., SHARON K., STRAUGHN A., COE D., BROADHURST T. and GUHATHAKURTA P.
Abstract (from CDS):
We take advantage of gravitational lensing amplification by A1689 (z = 0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux of i775= 27.3 via slitless grism spectroscopy. One ELG (at z = 0.7895) is very bright owing to lensing magnification by a factor of ~4.5. Several Balmer emission lines (ELs) detected from ground-based follow-up spectroscopy signal the onset of a major starburst for this low-mass galaxy (M*~ 2x109 M☉) with a high specific star formation rate (~20/Gyr). From the blue ELs we measure a gas-phase oxygen abundance consistent with solar (12+log(O/H) = 8.8±0.2). We break the continuous line-emitting region of this giant arc into seven ∼1 kpc bins (intrinsic size) and measure a variety of metallicity-dependent line ratios. A weak trend of increasing metal fraction is seen toward the dynamical center of the galaxy. Interestingly, the metal line ratios in a region offset from the center by ∼1 kpc have a placement on the blue H II region excitation diagram with f ([O III])/f (Hβ) and f ([Ne III])/f (Hβ) that can be fitted by an active galactic nucleus (AGN). This asymmetrical AGN-like behavior is interpreted as a product of shocks in the direction of the galaxy's extended tail, possibly instigated by a recent galaxy interaction.
cosmology: observations - galaxies: clusters: general - galaxies: clusters: individual: A1689 - galaxies: distances and redshifts - galaxies: fundamental parameters
Table 1, col(1): [FHB2012] ELS NNNNN N=51 among (Nos 486-20004). Table 2, col(1): [FHB2012] ELG N (Nos 1-7).
Status at CDS:
View the reference in ADS
To bookmark this query, right click on this link: simbad:2012ApJ...754...17F and select 'bookmark this link' or equivalent in the popup menu