J/A+A/596/A64 4 AGN optical spectra (Simmonds+, 2016) ================================================================================ Do some AGN lack X-ray emission? Simmonds C., Bauer F.E., Thuan T.X., Izotov Y.I., Stern D., Harrison F.A. =2016A&A...596A..64S (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Active gal. nuclei ; Spectroscopy Keywords: galaxies: active - galaxies: Seyfert - X-rays: galaxies - galaxies: dwarf Abstract: Intermediate-Mass Black Holes (IMBHs) are thought to be the seeds of early Supermassive Black Holes (SMBHs). While >~100 IMBH and small SMBH candidates have been identified in recent years, few have been robustly confirmed to date, leaving their number density in considerable doubt. Placing firmer constraints both on the methods used to identify and confirm IMBHs/SMBHs, as well as characterizing the range of host environments that IMBHs/SMBHs likely inhabit is therefore of considerable interest and importance. Additionally, finding significant numbers of IMBHs in metal-poor systems would be particularly intriguing, since such systems may represent local analogs of primordial galaxies, and therefore could provide clues of early accretion processes. Here we study in detail several candidate Active Galactic Nuclei (AGN) found in metal-poor hosts. We utilize new X-ray and optical observations to characterize these metal-poor AGN candidates and compare them against known AGN luminosity relations and well-characterized IMBH/SMBH samples. Description: We targeted with dedicated Chandra observations the four most extreme ELGs reported by Izotov and Thuan (2008ApJ...687..133I) (J1025+1402, J1047+0739, J0045+1339, and J1222+3602). For completeness, we also report the results of archival Chandra observations for three weaker objects (J1536+3122, J0840+4707, and J1404+5423) in the parent Izotov et al. (2007ApJ...671.1297I) sample which also have broad H{alpha} emission lines. New optical spectra for galaxies J0045+1339, J1025+1402, J1047+0739, and J1222+3602 were obtained using the Apache Point Observatory (APO) 3.5m telescope using the Dual Imaging Spectrograph (DIS) in both the blue and red wavelength ranges. The sources were observed on several occasions between 2007-2015. New optical spectra for galaxies J0045+1339 and J1222+3602 were obtained using the MODS instrument on the Large Binocular Telescope (LBT) on UT 2013 October 27 and UT 2015 May 18, respectively. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 131 4 List of AGN with spectra fits/* . 6 Individual fits files -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 19 A19 --- SDSS SDSS name 9JHHMMSS.ss+DDMMSS.s) 21- 30 A10 --- Name SDSS short name (JHHMM+DDMM) 32- 33 I2 h RAh Right ascension (J2000) 35- 36 I2 min RAm Right ascension (J2000) 38- 41 F4.1 s RAs Right ascension (J2000) 43 A1 --- DE- Declination sign (J2000) 44- 45 I2 deg DEd Declination (J2000) 47- 48 I2 arcmin DEm Declination (J2000) 50- 51 I2 arcsec DEs Declination (J2000) 53- 59 F7.5 --- z Redshift 61- 64 A4 --- Inst Instrument 66- 75 A10 "date" Obs.date Observation date 77-103 A27 --- FileName1 Name of the fits file with spectra in subdirectory fits 105-131 A27 --- FileName2 Name of the fits file with spectra in subdirectory fits -------------------------------------------------------------------------------- Acknowledgements: Charlotte Simmonds, cpsimmonds(at)uc.cl ================================================================================ (End) Patricia Vannier [CDS] 09-Nov-2016