J/ApJ/900/47 UV to NIR spectra of the QSO 2MASS J15165323+1900482 (Li+, 2020) ================================================================================ Ultradense gas at the dusty torus scale in a partially obscured quasar. Li Z., Zhou H., Hao L., Shi X., Zhang S., Ji T., Sun L., Dai X. =2020ApJ...900...47L ================================================================================ ADC_Keywords: QSOs; Spectra, optical; Spectra, infrared; Spectra, ultraviolet Keywords: Active galaxies ; AGN host galaxies ; Quasars Abstract: We present detailed studies of the partially obscured quasar 2MASSJ151653.23+190048.2 with continuous broadband spectrophotometry from near-infrared (NIR) through optical to ultraviolet (UV). The NIR and optical spectra show strong broad emission lines, while the UV spectrum is dominated by a set of rich intermediate-width emission lines (IELs). These IELs, unshifted with respect to the quasar systemic velocity measured by narrow emission lines, share a common profile of about 1900km/s in FWHM, in contrast to the Balmer and Paschen broad emission lines of FWHM ~6300km/s observed in the optical and NIR. The intermediate width of these lines indicates that the emitting gas may come from the dusty torus region. However, the observed peculiar IEL intensity ratios, such as NV{lambda}1240/Ly{alpha}, indicate that the emitting gas has a very high density, up to ~10^13^cm^-3^. Such a high density is unusual for gas around the dusty torus region, except that we consider mechanisms such as shocks that can produce local ultradense gas. We speculate that these emission lines could originate from the shock region, possibly induced by the quasar outflow colliding with the inner wall of the dusty torus. If true, this may give us an opportunity to peep at the quasar outflows at the scale of the dusty torus that have so far been elusive due to the limited resolving powers of existing facilities. Description: We collected the broadband photometric data of 2MASSJ15165323+1900482 from the archives of various large sky surveys, which include the Wide-field Infrared Survey Explorer (WISE), Two Micron All Sky Survey (2MASS), Sloan Digital Sky Survey (SDSS), Galaxy Evolution Explorer (GALEX), and Chandra X-ray Observatory. The UV spectrophotometry of J1516+1900 was obtained on 2002-Feb-11 with the STIS on board the HST (PI: Paul Smith; program ID: 9161). On 2016 April 20, we performed follow-up NIR spectroscopic observations of J1516+1900 using TripleSpec on the Hale Telescope. To acquire an optical spectrum with higher quality, we performed two spectroscopic observations. We observed this object using the Kast Double Spectrograph on the Shane Telescope at the Lick Observatory on 2016 July 4. We also observed this object using the DoubleSpec on the Hale Telescope at Palomar Observatory on 2017 January 9. Objects: ------------------------------------------------------------------------ RA (ICRS) DE Designation(s) ------------------------------------------------------------------------ 15 16 53.23 +19 00 48.2 2MASS J1516+1900 = 2MASS J15165324+1900484 ------------------------------------------------------------------------ File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file fig2-nir.dat 17 5710 NIR spectrum obtained by Hale TripleSpec (Data behind Figure 2) fig2-opt.dat 16 3894 Optical spectrum combined by Shane DoubleSpec and Hale DoubleSpec spectrum (Data behind Figure 2) fig2-uv.dat 23 1910 UV spectrum taken by HST/STIS (Data behind Figure 2) -------------------------------------------------------------------------------- See also: B/hst : HST Archived Exposures Catalog (STScI, 2007) B/chandra : The Chandra Archive Log (CXC, 1999-2014) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/311 : WISE All-Sky Data Release (Cutri+ 2012) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017) IX/57 : The Chandra Source Catalog (CSC), Release 2.0 (Evans+, 2019) J/ApJ/569/23 : Optical polarisation of 2MASS QSOs (Smith+, 2002) J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004) J/A+A/417/515 : I Zw 1 unusual emission line spectrum (Veron-Cetty+, 2004) J/ApJ/683/L115 : Intermediate-line region in quasars (Hu+, 2008) J/ApJ/700/1173 : Analysis of broad-line regions in AGNs (Zhu+, 2009) J/MNRAS/414/500 : Spitzer/IRS ATLAS project source (Hernan-Caballero+, 2011) J/ApJ/730/19 : IR spectra and SEDs for starbursts and AGNs (Sargsyan+, 2011) J/ApJ/736/42 : HST QSO Catalog (Ribaudo+, 2011) J/ApJ/736/86 : FeII emission in SDSS type 1 AGNs (Dong+, 2011) J/ApJS/214/23 : IR spectra and photometry of z<0.5 quasars (Shi+, 2014) J/ApJ/818/113 : HST observations of QSOs with medium spectra (Neeleman+, 2016) J/ApJ/818/L14 : RM AGNs accretion rates and BH masses (Du+, 2016) J/ApJ/856/6 : SEAMBHs IX. 10 new H{beta} light curves (Du+, 2018) Byte-by-byte Description of file: fig2-nir.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 F8.2 0.1nm lambda [8279.86/20707.8] Wavelength, rest frame, in {AA} units 10- 17 F8.4 10-17cW/m2/nm Flux [71/214] Flux in 10^-17^erg/s/cm^2^/{AA} units -------------------------------------------------------------------------------- Byte-by-byte Description of file: fig2-opt.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 F7.2 0.1nm lambda [2886.4/7818.8] Wavelength, rest frame, in {AA} units 9- 16 F8.3 10-17cW/m2/nm Flux [111/1329] Flux in 10^-17^erg/s/cm^2^/{AA} units -------------------------------------------------------------------------------- Byte-by-byte Description of file: fig2-uv.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 10 F10.5 0.1nm lambda [962/2650] Wavelength, rest frame, in {AA} units 12- 23 F12.7 10-17cW/m2/nm Flux [-482/1843] Flux in 10^-17^erg/s/cm^2^/{AA} units -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-Dec-2021