2008A&A...477..413B

Query : 2008A&A...477..413B

2008A&A...477..413B - Astronomy and Astrophysics, volume 477, 413-418 (2008/1-2)

The emission-line spectrum of the UV deficient quasar Ton 34: evidence of shock excitation?

BINETTE L. and KRONGOLD Y.

Abstract (from CDS):

Emission lines in quasars are believed to originate from a photoionized plasma. There are, however, some emission features that appear to be collisionally excited, such as the FeII multiplet bands. Shortward of Lyα, there are also a few permitted lines of species from low to intermediate ionization. Ton 34 (zq=1.928) exhibits the steepest far-UV continuum decline known (Fν∝ν–5.3) shortward of 1050Å. This object also emits unusually strong low to intermediate-excitation permitted lines shortward of the Lyman limit.Using archive spectra of Ton 34 from HST, IUE, and Palomar, we measured the fluxes of all the lines present in the spectra and compared their relative intensities with those observed in composite quasar spectra. Our analysis reveals unusual strengths with respect to Lyα of the following low to intermediate-excitation permitted lines: OII+OIII (835Å), NIII+OIII (686-703Å), and NIII+NIV (765Å). We compared the observed line spectrum with both photoionization and shock models.Photoionization cannot reproduce the strengths of these far-UV lines. Shocks with Vs≃100km/s turn out to be extremely efficient emitters of these lines and are favored as an excitation mechanism.

Abstract Copyright: ∼

Journal keyword(s): line: identification - line: formation - atomic processes - galaxies: quasars: emission lines - galaxies: quasars: individual: Ton 34

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Ton 34 QSO 10 19 56.5979680488 +27 44 01.738221864   16.06 15.69     ~ 112 0

Query : 2008A&A...477..413B

Basic data :
Ton 34 -- Quasar
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		QSO (2011MNRAS,QSO,...), * (GEN#,UBV,...), Opt (LAMOST,SDSS), blu (Ton), UV (PG), NIR (2MASS), IR (2MASSI)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		10 19 56.5979680488 +27 44 01.738221864 (Optical) [ 0.0412 0.0411 90 ] A 2020yCat.1350....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		10 17 07.7238271669 +27 59 07.203167125 [ 0.0412 0.0411 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		202.9559084228457 +56.5137803552401 [ 0.0412 0.0411 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr : 		0.002 -0.036 [0.048 0.047 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 237161 [~] / z(emission) 1.928 [~] / cz 578000 [~]
   (Opt) D 2016ApJ...818..113N
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas): 		0.0072 [0.0524] A 2020yCat.1350....0G
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (11) :
B 16.06 [~] E ~
V 15.69 [~] E ~
G 16.022335 [0.003770] C 2020yCat.1350....0G
J 14.648 [0.035] C 2010AJ....139.2360S
H 14.197 [0.041] C 2010AJ....139.2360S
K 13.658 [0.041] C 2010AJ....139.2360S
u (AB) 16.4371 [0.0212] C 2020ApJS..250....8L
g (AB) 16.3410 [0.0259] C 2020ApJS..250....8L
r (AB) 15.9745 [0.0134] C 2020ApJS..250....8L
i (AB) 15.6004 [0.0168] C 2020ApJS..250....8L
z (AB) 15.5650 [0.0197] C 2020ApJS..250....8L
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!). sed-help-icon

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (26) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

QSO J1019+2743 QSO J1019+2745 Ton 34 [VV2010] J101956.6+274402
GEN# +6.10070034 QSO J1019+2744 UBV M 43113 [VV96] J101956.6+274402
LAMOST J101956.60+274401.7 QSO B1017+2759 [BDW2002] q1017+2759 [VV98] J101956.6+274402
LAMOST J101956.59+274401.7 QSO B1017+279 [HB93] 1017+280 Gaia DR3 740881892919821312
2MASS J10195659+2744017 QSO B1017+280 [VV2000] J101956.6+274402 Gaia DR2 740881892919821312
2MASSI J1019566+274401 SDSS J101956.59+274401.7 [VV2003] J101956.6+274402
PG 1017+28 TIC 1097732 [VV2006] J101956.6+274402

References (112 between 1850 and 2024) (Total 112)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 9    PLX : 2    PM : 2   

   

Observing logs


IUE : 5   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : Ton 34

Link by name to the catalogue in VizieR :

2MASS J10195659+2744017 2MASSI J1019566+274401 PG 1017+28 SDSS J101956.59+274401.7 Gaia DR3 740881892919821312
Gaia DR2 740881892919821312

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