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J/ApJ/806/L35    NIR spectroscopy of COSMOS FIR galaxies    (Kartaltepe+, 2015)

Rest-frame optical emission lines in far-infrared-selected galaxies at z<1.7 from the FMOS-COSMOS survey. Kartaltepe J.S., Sanders D.B., Silverman J.D., Kashino D., Chu J., Zahid H., Hasinger G., Kewley L., Matsuoka K., Nagao T., Riguccini L., Salvato M., Schawinski K., Taniguchi Y., Treister E., Capak P., Daddi E., Ohta K. <Astrophys. J., 806, L35 (2015)> =2015ApJ...806L..35K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Redshifts ; Spectra, infrared ; X-ray sources Keywords: cosmology: observations; galaxies: active; galaxies: evolution; galaxies: high-redshift; infrared: galaxies; surveys Abstract: We have used FMOS on Subaru to obtain near-infrared spectroscopy of 123 far-infrared-selected galaxies in COSMOS and the key rest-frame optical emission lines. This is the largest sample of infrared galaxies with near-infrared spectroscopy at these redshifts. The far-infrared selection results in a sample of galaxies that are massive systems that span a range of metallicities in comparison with previous optically selected surveys, and thus has a higher active galactic nucleus (AGN) fraction and better samples the AGN branch. We establish the presence of AGNs and starbursts in this sample of (U)LIRGs selected as Herschel-PACS and Spitzer-MIPS detections in two redshift bins (z∼0.7 and z∼1.5) and test the redshift dependence of diagnostics used to separate AGNs from star formation dominated galaxies. In addition, we construct a low-redshift (z∼0.1) comparison sample of infrared-selected galaxies and find that the evolution from z∼1.5 to today is consistent with an evolving AGN selection line and a range of ISM conditions and metallicities from the models of Kewley et al. (2013ApJ...774L..10K). We find that a large fraction of (U)LIRGs are BPT-selected AGNs using their new redshift-dependent classification line. We compare the position of known X-ray-detected AGNs (67 in total) with the BPT selection and find that the new classification line accurately selects most of these objects (>70%). Furthermore, we identify 35 new (likely obscured) AGNs not selected as such by their X-ray emission. Our results have direct implications for AGN selection at higher redshift with either current (MOSFIRE, KMOS) or future (PFS, MOONS) spectroscopic efforts with near-infrared spectral coverage. Description: The FMOS survey of the COSMOS field is divided into two parts -a now complete low-resolution survey (R∼600; J. S. Kartaltepe et al. 2015, in preparation) and an ongoing high-resolution survey (R∼2000; Silverman et al. 2015ApJ...812L..23S). Here, we focus on observations from the low-resolution survey (range 0.9-1.8um). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 89 119 IR-selected Subaru/FMOS source properties
See also: VIII/95 : Herschel Multi-tiered Extragalactic Survey (Oliver+, 2012) VII/265 : COSMOS Morphological Catalog (V1.1) (Tasca+ 2009) II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007) J/MNRAS/428/1128 : UDS/COSMOS HiZELS galaxies (Sobral+, 2013) J/ApJS/201/30 : The Chandra COSMOS survey. III. (Civano+, 2012) J/A+A/532/A90 : PACS Evolutionary Probe (PEP-DR1) catalogs (Lutz+, 2011) J/ApJ/721/98 : Morphology of 70um COSMOS galaxies (Kartaltepe+, 2010) J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010) J/ApJ/709/884 : Role of starburst-AGN composites in LIRG mergers (Yuan+, 2010) J/ApJ/709/572 : COSMOS 70um sources (Kartaltepe+, 2010) J/ApJ/696/1195 : COSMOS AGN spectroscopic survey. I. (Trump+, 2009) J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009) J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007) J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007) J/ApJ/660/167 : Spitzer AGN candidates in CDFN (Donley+, 2007) J/ApJS/143/315 : Ultraluminous galaxies IRAS 1Jy sample. II. (Veilleux+, 2002) : MPA-JHU DR7 release Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 A6 --- --- [COSMOS] 8- 28 A21 --- COSMOS Source identifier ( 30- 38 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 40- 48 F9.7 deg DEdeg Declination in decimal degrees (J2000) 50- 55 F6.4 --- z [0.5/1.7] Spectroscopic redshift 57- 60 F4.1 [Lsun] logLIR [10.7/13] Log MIR-FIR SED luminosity (1) 62- 67 F6.2 [10-7W] logLX [42.5/45.2]?=-99 Log Chandra 2-10keV X-ray luminosity; erg/s 69- 76 F8.5 --- N2/Ha [-1.2/0.2] The [NII](6548,6584) to Hα ratio 78- 85 F8.5 --- O3/Hb [-1.5/1.4] The [OIII](4959,5007) to Hβ ratio 87 I1 --- IR-AGN? [0/1] An IR identified AGN? (1=yes) 89 I1 --- BPT-AGN? [0/1] Baldwin, Phillips & Terlevich 1981PASP...93....5B identified AGN? (1=yes)
Note (1): Using the IRAC 8 micron, MIPS 24 micron, 70 micron, PACS 100 micron and 160 micron, and SPIRE 250 micron photometry.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Oct-2015
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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