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Physical conditions of the interstellar medium in star-forming galaxies at z~1.5
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Kashikawa, Nobunari Hayashi, Masao Goto, Ryosuke Shimasaku, Kazuhiro Motohara, Kentaro Malkan, Matthew A. Ly, Chun Nagao, Tohru Naito, Yoshiaki |
| Copyright Year | 2015 |
| Description | We present results from Subaru/FMOS near-infrared (NIR) spectroscopy of 118 star-forming galaxies at z approximately equal to 1.5 in the Subaru Deep Field. These galaxies are selected as [O II] lambda 3727 emitters at z approximately equal to 1.47 and 1.62 from narrow-band imaging. We detect H alpha emission line in 115 galaxies, [O III] lambda 5007 emission line in 45 galaxies, and H Beta, [N II] lambda 6584, and [S II]lambda lambda 6716, 6731 in 13, 16, and 6 galaxies, respectively. Including the [O II] emission line, we use the six strong nebular emission lines in the individual and composite rest-frame optical spectra to investigate physical conditions of the interstellar medium in star-forming galaxies at z approximately equal to 1.5. We find a tight correlation between H alpha and [O II], which suggests that [O II] can be a good star formation rate (SFR) indicator for galaxies at z approximately equal to 1.5. The line ratios of H alpha / [O II] are consistent with those of local galaxies. We also find that [O II] emitters have strong [O III] emission lines. The [O III]/[O II] ratios are larger than normal star-forming galaxies in the local Universe, suggesting a higher ionization parameter. Less massive galaxies have larger [O III]/[O II] ratios. With evidence that the electron density is consistent with local galaxies, the high ionization of galaxies at high redshifts may be attributed to a harder radiation field by a young stellar population and/or an increase in the number of ionizing photons from each massive star. |
| File Size | 1095761 |
| Page Count | 23 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20150011665 |
| Archival Resource Key | ark:/13960/t1rg0r80d |
| Language | English |
| Publisher Date | 2015-04-23 |
| Access Restriction | Open |
| Subject Keyword | Interstellar Physical Conditions Infrared Spectroscopy Red Shift Galaxies Imaging Techniques H Alpha Line Star Formation Rate Massive Stars Radiation Distribution Infrared Telescopes Star Formation Hydrogen Ions Emission Spectra Ionization Oxygen Ions Interstellar Matter Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
