2004A&A...422..925S


Query : 2004A&A...422..925S

2004A&A...422..925S - Astronomy and Astrophysics, volume 422, 925-940 (2004/8-2)

Profile variability of the Hα and Hβ broad emission lines in NGC 5548.

SHAPOVALOVA A.I., DOROSHENKO V.T., BOCHKAREV N.G., BURENKOV A.N., CARRASCO L., CHAVUSHYAN V.H., COLLIN S., VALDES J.R., BORISOV N., DUMONT A.-M., VLASYUK V.V., CHILINGARIAN I., FIOKTISTOVA I.S. and MARTINEZ O.M.

Abstract (from CDS):

Between 1996 and 2002, we have carried out a spectral monitoring program for the Seyfert galaxy NGC 5548 with the 6m and 1m telescopes of SAO (Russia) and with the 2.1m telescope of Guillermo Haro Observatory (GHO) at Cananea, Mexico. High quality spectra with S/N>50 in the continuum near Hα and Hβ were obtained, covering the spectral range ~(4000-7500)Å with a (4.5 to 15)Å-resolution. We found that both the flux in the lines and the continuum gradually decreased, reaching minimum values during May-June 2002. In the minimum state, the wings of Hβ and Hα became extremely weak, corresponding to a Sy1.8 type, not to a Sy1, as observed previously when the nucleus was brighter. The line profiles were decomposed into variable and constant components. The variable broad component is well correlated with the continuum variation. It consists of a double peaked structure with radial velocities ~±1000km/s relative to the narrow component. A constant component, whose presence is independent of the continuum flux variations, shows only narrow emission lines.The mean, rms, and the averaged over years, observed and difference line profiles of Hβ and Hα reveal the same double peaked structure. The relative intensity of these peaks changes with time. During 1996, the red peak was the brightest, while in 1998-2002, the blue peak became the brighter one. Their radial velocities vary in the ~(500-1200)km/s range. In 2000-2002 a distinct third peak appeared in the red wing of Hα and Hβ line profiles. The radial velocity of this feature decreased between 2000 and 2002: from the observed profiles, from ~+(2500-2600)km/s to ~+2000km/s and is clearly seen on the difference profiles. The fluxes of the various parts of the line profiles are well correlated with each other and also with the continuum flux. The blue and red parts of the line profiles at the same radial velocities vary in an almost identical manner. Shape changes of the different parts of the broad line are not correlated with continuum variations and, apparently, are not related to reverberation effects. Changes of the integral Balmer decrement are, on average, anticorrelated with the continuum flux variations. This is probably due to an increasing role of collisional excitation as the ionizing flux decreases. The behavior of the Balmer decrement of the various parts of the line profiles was different in 1996-2000 as compared with the 2001 behavior. Our results favor the formation of the broad Balmer lines in a turbulent accretion disc with large and moving ``optically thick'' inhomogeneities, capable of reprocessing the central source continuum.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: Seyfert - galaxies: individual: NGC 5548 - line: profiles

VizieR on-line data: <Available at CDS (J/A+A/422/925): appenda.txt table2.dat table5.dat>

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 - 2022
#notes
1 NGC 5548 Sy1 14 17 59.5400291832 +25 08 12.603122268   14.35 13.73     ~ 2530 0

Query : 2004A&A...422..925S

Basic data :
NGC 5548 -- Seyfert 1 Galaxy
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:
X (2A,3A,...), G (2015ApJ,ECO,...), AGN (2010ApJS,[HB91],...), IR (AKARI,IRAS,...), UV (2EUVE,EUVE,...), Sy1 (2013ApJS), V* (AAVSO), * (Gaia), GiC ([BKB95]), GiG ([CHM2007]), EmG (2015A&A), SyG (2013ApJS), gam (INTREF)
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) :
14 17 59.5400291832 +25 08 12.603122268 (Optical) [ 0.0242 0.0270 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) :
14 15 43.4924015726 +25 22 01.249516687 [ 0.0242 0.0270 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) :
031.9607439471738 +70.4957558374883 [ 0.0242 0.0270 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 :
-0.147 0.065 [0.032 0.032 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) 4838 [9] / z(spectroscopic) 0.01627 [0.00003] / cz 4877.6 [9.0]
   (Opt) C 2012ApJS..203...21A
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the morphological type reference
Morphological type:
SA C 2019MNRAS.488..590B
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin):
0.800 0.688 140 (NIR) C 2006AJ....131.1163S
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 14.35 [~] D 2010A&A...518A..10V
V 13.73 [~] D 2010A&A...518A..10V
G 14.398336 [0.010239] C 2020yCat.1350....0G
J 10.643 [0.018] C 2006AJ....131.1163S
H 9.884 [0.017] C 2006AJ....131.1163S
K 9.387 [0.019] C 2006AJ....131.1163S
u (AB) 14.812 [0.004] C 2009ApJS..182..543A
g (AB) 13.355 [0.002] C 2009ApJS..182..543A
r (AB) 12.626 [0.002] C 2009ApJS..182..543A
i (AB) 12.323 [0.002] C 2009ApJS..182..543A
z (AB) 12.058 [0.002] C 2009ApJS..182..543A
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.
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Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 3
The count displayed here is the number of children objects.
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%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

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: 3 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (61) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 5548 LEDA 51074 SWIFT J1417.9+2507 [DML87] 344
2A 1415+255 2MASS J14175955+2508126 SWIFT J1418.2+2507 [HB91] 1415+253
3A 1415+253 2MASX J14175951+2508124 TIC 156602278 [KRL2007b] 154
AKARI-IRC-V1 J1417595+250812 2MAXI J1417+253 4U 1414+25 [KVC2005] 3
2E 3236 MAXI J1418+251 UGC 9149 [VV2000c] J141759.6+250813
2E 1415.7+2522 MCG+04-34-013 UVQS J141759.54+250812.6 [VV2003c] J141759.6+250813
ECO 4631 Mrk 1509 UZC J141759.6+250813 [VV2006c] J141759.6+250813
2EUVE J1417+25.1 PBC J1417.9+2508 WISEA J141759.54+250812.6 [VV2010c] J141759.6+250813
EUVE J1417+25.1 PSCz Q14156+2522 WISE J141759.55+250812.7 [VV98c] J141759.6+250813
1H 1415+255 RBS 1367 2XMM J141759.5+250812 [ZEH2003] RX J1418.0+2508 1
H 1416+256 1RXP J141759.3+250811 XSS J14181+2514 AAVSO 1413+25
H 1415+253 RX J141759+25081 Z 133-25 Gaia EDR3 1255795527649038720
INTREF 597 RX J1418.0+2508 Z 1415.7+2522 Gaia DR2 1255795527649038720
IRAS 14156+2522 RX J1417.9+2508 [BKB95] 1415+2522
IRAS F14157+2522 1RXS J141759.6+250817 [CHM2007] HDC 866 J141759.51+2508124
KUG 1415+253 SDSS J141759.54+250812.7 [CHM2007] LDC 1053 J141759.51+2508124

References (2530 between 1850 and 2022) (Total 2530)
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 : 21    distance : 2    PM : 2   

   

Observing logs


herschel : 4    ISO : 7    IUE : 258    XMM : 3   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : NGC 5548

Link by name to the catalogue in VizieR :

NGC 5548 AKARI-IRC-V1 J1417595+250812 2E 3236 EUVE J1417+25.1 IRAS 14156+2522
IRAS F14157+2522 KUG 1415+253 2MASS J14175955+2508126 2MASX J14175951+2508124 1RXS J141759.6+250817
SDSS J141759.54+250812.7 UGC 9149 WISEA J141759.54+250812.6 WISE J141759.55+250812.7 [DML87] 344
Gaia EDR3 1255795527649038720 Gaia DR2 1255795527649038720

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2022.05.21-23:06:35

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