J/ApJ/676/944 GALEX and CFHTLS candidate tidal disruption events (Gezari+, 2008)
UV/Optical detections of candidate tidal disruption events by GALEX and CFHTLS.
Gezari S., Basa S., Martin D.C., Bazin G., Forster K., Milliard B.,
Halpern J.P., Friedman P.G., Morrissey P., Neff S.G., Schiminovich D.,
Seibert M., Small T., Wyder T.K.
<Astrophys. J., 676, 944-969 (2008)>
=2008ApJ...676..944G 2008ApJ...676..944G
ADC_Keywords: Ultraviolet ; Galaxies, optical ; Photometry, SDSS
Keywords: galaxies: nuclei - ultraviolet: galaxies - X-rays: galaxies
Abstract:
We present two luminous UV/optical flares from the nuclei of
apparently inactive early-type galaxies at z=0.37 and 0.33 that have
the radiative properties of a flare from the tidal disruption of a
star. In this paper we report the second candidate tidal disruption
event discovery in the UV by the GALEX Deep Imaging Survey and present
simultaneous optical light curves from the CFHTLS Deep Imaging Survey
for both UV flares.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sources.dat 167 87 UV variable sources with optical matches in
XMM-LSS (D1, 23 sources, table 2),
COSMOS (D2, 23 sources, table 3),
GROTH (D3, 32 sources, table 4),
CFHTLS (D4, 9 sources, table 5),
matches.dat 112 87 Optical matches to UV variable sources in
XMM-LSS (D1, table 6), COSMOS (D2, table 7),
GROTH (D3, table 8) and CFHTLS (D4, table 9)
table10.dat 55 11 Tidal disruption flare candidates
table11.dat 80 8 Log of optical spectroscopic observations
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/MNRAS/356/568 : Deep Chandra survey of the Groth Strip (Nandra+, 2005)
J/AJ/130/825 : GALEX ultraviolet variability catalog (Welsh+, 2005)
J/AJ/133/1780 : GALEX/SDSS quasar catalog (Trammell+, 2007)
J/ApJ/664/53 : UV photometry of GALEX QSO candidates (Atlee+, 2007)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+ 2007)
J/ApJS/173/441 : UV-Luminous galaxies discovered by GALEX (Hoopes+, 2007)
J/MNRAS/382/279 : XMM-LSS catalogue. Version I. (Pierre+, 2007)
Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name (DN-NN)
7- 22 A16 --- GALEX GALEX name (JHHMMSS.s+DDMMSS)
24- 31 F8.4 deg RAdeg Right ascension in decimal degrees (J2000)
33- 40 F8.4 deg DEdeg Declination in decimal degrees (J2000)
42 A1 --- l_FUV03 Limit flag on FUV03
43- 47 F5.2 mag FUV03 ?=- GALEX FUV (135-175nm) magnitude in 2003
49- 52 F4.2 mag e_FUV03 ? rms uncertainty on FUV03
54 A1 --- l_FUV04 Limit flag on FUV04
55- 59 F5.2 mag FUV04 GALEX FUV (135-175nm) magnitude in 2004
61- 64 F4.2 mag e_FUV04 ? rms uncertainty on FUV04
66 A1 --- l_FUV05 Limit flag on FUV05
67- 71 F5.2 mag FUV05 ?=- GALEX FUV (135-175nm) magnitude in 2005
73- 76 F4.2 mag e_FUV05 ? rms uncertainty on FUV05
78 A1 --- l_FUV06 Limit flag on FUV06
79- 83 F5.2 mag FUV06 GALEX FUV (135-175nm) magnitude in 2006
85- 88 F4.2 mag e_FUV06 ? rms uncertainty on FUV06
90 A1 --- l_FUV07 Limit flag on FUV07
91- 95 F5.2 mag FUV07 ?=- GALEX FUV (135-175nm) magnitude in 2007
97-100 F4.2 mag e_FUV07 ? rms uncertainty on FUV07
102-105 F4.1 --- sigma Factor times σ(m) that the source varies
107 A1 --- FT [FT] Flare/Transient Type (G1)
109 A1 --- l_NUV03 Limit flag on NUV03
110-114 F5.2 mag NUV03 ?=- GALEX NUV (175-280nm) magnitude in 2003
116-119 F4.2 mag e_NUV03 ? rms uncertainty on NUV03
121 A1 --- l_NUV04 Limit flag on NUV04
122-126 F5.2 mag NUV04 GALEX NUV (175-280nm) magnitude in 2004
128-131 F4.2 mag e_NUV04 ? rms uncertainty on NUV04
133 A1 --- l_NUV05 Limit flag on NUV05
134-138 F5.2 mag NUV05 ?=- GALEX NUV (175-280nm) magnitude in 2005
140-143 F4.2 mag e_NUV05 ? rms uncertainty on NUV05
145 A1 --- l_NUV06 Limit flag on NUV06
146-150 F5.2 mag NUV06 GALEX NUV (175-280nm) magnitude in 2006
152-155 F4.2 mag e_NUV06 ? rms uncertainty on NUV06
157 A1 --- l_NUV07 Limit flag on NUV07
158-162 F5.2 mag NUV07 ?=- GALEX NUV (175-280nm) magnitude in 2007
164-167 F4.2 mag e_NUV07 ? rms uncertainty on NUV07
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Byte-by-byte Description of file: matches.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name (DN-NN)
7- 22 A16 --- GALEX GALEX name (JHHMMSS.s+DDMMSS)
24- 29 F6.3 mag umag SDSS u magnitude
31- 35 F5.3 mag e_umag rms uncertainty on umag
37- 42 F6.3 mag gmag SDSS g magnitude
44- 48 F5.3 mag e_gmag rms uncertainty on gmag
50- 55 F6.3 mag rmag SDSS r magnitude
57- 61 F5.3 mag e_rmag rms uncertainty on rmag
63- 68 F6.3 mag imag SDSS i magnitude
70- 74 F5.3 mag e_imag rms uncertainty on imag
76- 81 F6.3 mag zmag SDSS z magnitude
83- 87 F5.3 mag e_zmag rms uncertainty on zmag
89- 93 F5.3 arcsec r1/2 Half-light radius
95- 97 F3.1 arcsec Sep Separation UV/optical
99-101 A3 --- Flag [oxsg ] Source pecularities (G2)
103-106 A4 --- Class Classification (1)
108-112 F5.3 --- z ? Redshift
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Note (1): Classification as follows:
QSO = optically unresolved sources (r1/2<0.6") with g-r<0.6 and
u-g<1 are classified as quasars
STAR = optically unresolved sources with u-g>1.75 or g-r<0.6 and
u-g>1 are classified as stars
GAL = optically resolved sources (r1/2>0.6") are classified as galaxies
AGN = optically resolved sources with a hard X-ray detection or an
active galaxy spectrum are classified as active galactic nuclei
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name (DN-NN)
7- 22 A16 --- GALEX GALEX name (JHHMMSS.s+DDMMSS)
24 A1 --- FT [FT] Flare Type (G1)
26 A1 --- Flag [o] Source pecularities (G2)
28- 31 A4 --- Template Galaxy template from photo-z fitting
routine (1)
33- 36 F4.2 --- zph1 Photometric redshift range
37 A1 --- --- [-]
38- 41 F4.2 --- zph2 Photometric redshift range
43- 48 F6.4 --- zsp ? Spectroscopic redshift
50- 55 A6 --- Type Spectral type (2)
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Note (1): Emission-line galaxies (either star-forming or Seyfert galaxies)
are labeled as "em".
Note (2): Classes are:
Early = spectra with no emission lines (early-type galaxies)
Sy2 = spectra with diagnostic narrow-line ratios of
([OIII]λ5007)/(Hβ)>3 (Seyfert 2 galaxies)
Sy1 = spectra that show broad Hβ emission (Seyfert 1 galaxies)
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name (DN-NN)
7- 22 A16 --- GALEX GALEX name (JHHMMSS.s+DDMMSS)
24- 33 A10 "YYYY/MM/DD" Date UT date
35- 42 A8 -- Tel Telescope
44- 48 A5 --- Inst Instrument
50- 52 F3.1 arcsec Slit Slit
54- 57 F4.1 0.1nm Dlambda Interval wavelength
59- 62 I4 s Texp Exposure time
64- 69 F6.4 --- z Spectroscopic redshift
71 A1 --- l_[OIII/Hb] Limit flag on [OIII/Hb]
72- 74 F3.1 --- [OIII/Hb] ? [OIII]λ5007)/(Hβ)
narrow-line ratio
76 A1 --- l_logL([OIII]) Limit flag on logL([OIII)]
77- 80 F4.1 [10-7W] logL([OIII]) ? [OIII]λ5007 luminosity
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Global notes:
Note (G1): Flare type flag as follows:
F = FUV flares that fade monotonically, have a steady flux before
the flare, and do not fade below the steady state flux
T = Transient FUV flares that fade monotonically and are not
detected before the start of the flare
Note (G2): Flag as follows:
o = sources that are optically variable
x = sources detected as a hard X-ray point source
s = sources with an optical AGN spectrum
g = sources with a UV quasar spectrum
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Sep-2010