J/ApJ/619/L95 Star formation in Stephan's Quintet (Xu+, 2005)
Ultraviolet emission and star formation in Stephan's Quintet.
Xu C.K., Iglesias-Paramo J., Burgarella D., Rich R.M., Neff S.G.,
Lauger S., Barlow T.A., Bianchi L., Byun Y.-I., Forster K., Friedman P.G.,
Heckman T.M., Jelinsky P.N., Lee Y.-W., Madore B.F., Malina R.F.,
Martin D.C., Milliard B., Morrissey P., Schiminovich D., Siegmund O.H.W.,
Small T., Szalay A.S., Welsh B.Y., Wyder T.K.
<Astrophys. J., 619, L95-L98 (2005)>
=2005ApJ...619L..95X 2005ApJ...619L..95X
ADC_Keywords: Active gal. nuclei ; Interstellar medium ; Ultraviolet
Keywords: galaxies: active - galaxies: interactions - galaxies: ISM -
galaxies: starburst - intergalactic medium - stars: formation
Abstract:
We present the first Galaxy Evolution Explorer (GALEX) UV images of
the well-known interacting group of galaxies, Stephan's Quintet (SQ).
We detect widespread UV emission throughout the group. However, there
is no consistent coincidence between UV structure and emission in the
optical, Hα, or HI. Excluding the foreground galaxy NGC 7320
(Sd), most of the UV emission is found in regions associated with the
two spiral members of the group, NGC 7319 and NGC 7318b, and the
intragroup medium starburst SQ-A. The extinction-corrected UV data are
analyzed to investigate the overall star formation activity in SQ.
Description:
SQ was observed by GALEX on 2003 August 23, 2003 September 5, and 2003
September 6 in five orbits, with total exposure time of 3327s.
Objects:
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RA (2000) DE Designation(s)
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22 35 57.5 +33 57 36 Stephan's Quintet = HCG 92
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 26 Star formation properties in HCG 92 regions
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 20 A20 --- Name Name of the region
21 A1 --- f_Name [*] contribution of AGN subtracted (1)
22- 26 A5 --- Reg Region number in FUV (see Fig.2a)
28- 32 F5.2 mag FUV FUV magnitude (1530Å), corrected for
Galactic extinction (2)
34- 37 F4.2 mag e_FUV Error in FUV (2)
39- 43 F5.2 [Lsun] logL log(LFUV), FUV luminosity (2) (3)
45- 48 F4.2 [Lsun] e_logL Error in logL (2)
50- 55 F6.3 Msun/yr SFR ?=-9.9 Star formation rate from LFUV (2) (3)
57- 61 F5.3 Msun/yr e_SFR ?=0 Error in SFR (2)
63- 67 F5.2 mag F-N FUV-NUV color index (NUV: 2310Å),
corrected for Galactic extinction (2)
69- 72 F4.2 mag e_F-N Error in F-N (2)
74- 77 F4.1 [yr] logtUV ?=-9.9 log(stellar age) derived from
extinction corrected FUV-NUV color index (3)
79- 81 F3.1 [yr] e_logtUV ?=0 Error in logtUV
83- 87 F5.2 mag B-V ?=-9.9 B-V color index, corrected for
Galactic extinction
89- 92 F4.2 mag e_B-V ?=0 Error in B-V
94- 97 F4.1 [yr] logtBV ?=-9.9 log(stellar age) derived from
extinction corrected B-V color index (3)
99-101 F3.1 [yr] e_logtBV ?=0 Error in logtBV
103-107 F5.2 mag AFUV ?=-9.9 Internal extinction in the FUV band (3)
109-112 F4.2 mag e_AFUV ?=0 Error in AFUV
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Note (1): The contribution from the AGN is subtracted from the UV, optical,
and MIR flux densities.
Note (2): Total values of the parameters:
FUVtotal = 15.36±0.10mag
logLtotal = 10.54±0.05LSun
SFRtotal = 6.687±0.646MSun/yr
F-Ntotal = 0.34±0.14mag
Note (3): Corrected for both internal and Galactic extinction.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 27-Jul-2005