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1. A Catalog of Emission-line Galaxies from the Faint Infrared Grism Survey: Studying Environmental Influence on Star Formation

Author

Caryl Gronwall, Steven L. Finkelstein, Anna Pasquali, Ignacio Ferreras, Amber Straughn, Vithal Tilvi, Anton M. Koekemoer, James E. Rhoads, John Pharo, Nimish P. Hathi, Andrea Cimatti, Lise Christensen, Russell E. Ryan, Rogier A. Windhorst, Robert W. O'Connell, Mark Smith, Pascale Hibon, Rebecca L. Larson, Sangeeta Malhotra, Santosh Harish, Norbert Pirzkal, Pharo J., Malhotra S., Rhoads J.E., Pirzkal N., Finkelstein S.L., Ryan R., Cimatti A., Christensen L., Hathi N., Koekemoer A., Harish S., Smith M., Straughn A., Windhorst R., Ferreras I., Gronwall C., Hibon P., Larson R., O'Connell R., Pasquali A., and Tilvi V.

Subjects
Physics, 010504 meteorology & atmospheric sciences, Stellar mass, Star formation, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Emission line galaxies, Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Galaxy, Space and Planetary Science, Galaxy evolution, Astrophysics of Galaxies (astro-ph.GA), Galaxy group, 0103 physical sciences, Galaxy formation and evolution, Galaxy environment, Emission spectrum, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, 0105 earth and related environmental sciences, Line (formation)
Abstract

We present a catalog of 208 $0.3 < z < 2.1$ Emission Line Galaxies (ELG) selected from 1D slitless spectroscopy obtained using Hubble's WFC3 G102 grism, as part of the Faint Infrared Grism Survey (FIGS). We identify ELG candidates by searching for significant peaks in all continuum-subtracted G102 spectra, and, where possible, confirm candidates by identifying consistent emission lines in other available spectra or with published spectroscopic redshifts. We provide derived emission line fluxes and errors, redshifts, and equivalent widths (EW) for H$\alpha$ $\lambda6563$, [OIII]$\lambda\lambda4959,5007$, and [OII]$\lambda\lambda3727$ emission lines, for emission line galaxies down to AB(F105W) $ > 28$ and $> 10^{-17}$ erg cm$^{-2}$ s$^{-1}$ line flux. We use the resulting line catalog to investigate a possible relationship between line emission and a galaxy's environment. We use 7th-nearest-neighbor distances to investigate the typical surroundings of ELGs compared to non-ELGs, and we find that [OIII] emitters are preferentially found at intermediate galaxy densities near galaxy groups. We characterize these ELGs in terms of the galaxy specific star formation rate (SSFR) versus stellar mass, and find no significant influence of environment on that relation. We calculate star formation rates (SFR), and find no dependence of SFR on local galaxy surface density for $0.3 < z < 0.8$ H$\alpha$ emitters and for $0.8, Comment: Accepted to ApJ. 36 pages, 14 figures

Published
2020
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2. First results from Faint Infrared Grism Survey (FIGS): first simultaneous detection of Lyman-alpha emission and Lyman break from a galaxy at z=7.51

Author

James E. Rhoads, Barry Rothberg, G. Östlin, Huan Yang, John Pharo, Lise Christensen, Jeremy R. Walsh, Bhavin Joshi, Vithal Tilvi, Nimish P. Hathi, Rachael Livermore, Robert W. O'Connell, Nadia L. Zakamska, Anton M. Koekemoer, Norman A. Grogin, Amber N. Straughn, Rogier A. Windhorst, R. E. Ryan, Alessandro Cimatti, P. Hibon, Steve Finkelstein, Jonathan P. Gardner, Caryl Gronwall, Nor Pirzkal, Sangeeta Malhotra, University of Arizona, Space Telescope Science Institute (STSci), Green Infrastructure approach: linking environmental with social aspects in studying and managing urban forests, COST, European Cooperation in Science and Technology, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Département Hospitalo-Universitaire Fight Ageing and STress (DHU FAST ), Université Pierre et Marie Curie - Paris 6 (UPMC), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), FOI, Linköping University (LIU), INAF - Osservatorio Astronomico di Bologna (OABO), Istituto Nazionale di Astrofisica (INAF), Oskar Klein Centre [Stockholm], Stockholm University, Department of Physics, Durham University, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), Service de gériatrie à orientation cardiologique [CHU Pitié-Salpêtrière], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Pitié-Salpêtrière [AP-HP], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Service de Médecine Gériatrique [CHU Pitié-Salpêtrière], Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Tilvi, V., Pirzkal, N., Malhotra, S., Finkelstein, S.L., Rhoads, J.E., Windhorst, R., Grogin, N.A., Koekemoer, A., Zakamska, N.L., Ryan, R., Christensen, L., Hathi, N., Pharo, J., Joshi, B., Yang, H., Gronwall, C., Cimatti, A., Walsh, J., O'Connell, R., Straughn, A., Ostlin, G., Rothberg, B., Livermore, R.C., Hibon, P., and Gardner, Jonathan P.

Subjects
Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Spectral line, galaxies: high-redshift, 0103 physical sciences, Emission spectrum, 010303 astronomy & astrophysics, Reionization, Astrophysics::Galaxy Astrophysics, Line (formation), Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astronomy and Astrophysic, Astrophysics - Astrophysics of Galaxies, early universe, Redshift, Galaxy, Grism, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), dark ages, reionization, first star, intergalactic medium, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Galaxies at high redshifts provide a valuable tool to study cosmic dawn, and therefore it is crucial to reliably identify these galaxies. Here, we present an unambiguous and first simultaneous detection of both the Lyman-alpha emission and the Lyman break from a z = 7.512+/- 0.004 galaxy, observed in the Faint Infrared Grism Survey (FIGS). These spectra, taken with G102 grism on Hubble Space Telescope (HST), show a significant emission line detection (6 sigma) in multiple observational position angles (PA), with total integrated Ly{\alpha} line flux of 1.06+/- 0.12 e10-17erg s-1cm-2. The line flux is nearly a factor of four higher than the previous MOSFIRE spectroscopic observations of faint Ly{\alpha} emission at {\lambda} = 1.0347{\mu}m, yielding z = 7.5078+/- 0.0004. This is consistent with other recent observations implying that ground-based near-infrared spectroscopy underestimates total emission line fluxes, and if confirmed, can have strong implications for reionization studies that are based on ground-based Lyman-{\alpha} measurements. A 4-{\sigma} detection of the NV line in one PA also suggests a weak Active Galactic Nucleus (AGN), potentially making this source the highest-redshift AGN yet found. Thus, this observation from the Hubble Space Telescope clearly demonstrates the sensitivity of the FIGS survey, and the capability of grism spectroscopy to study the epoch of reionization., Comment: Published in ApJL; matches published version

Published
2016
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