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J/ApJS/111/143 Virgo cluster ultraviolet sources (Brosch+ 1997)
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Faust observations of ultraviolet sources toward the Virgo cluster
Brosch N., Formiggini L., Almoznino E., Sasseen T., Lampton M., Bowyer S.
<Astrophys. J. Suppl. Ser. 111, 143 (1997)>
=1997ApJS..111..143B (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, galaxy ; Photometry, ultraviolet ; Photometry, UBV
Mission_Name: FAUST
Keywords: galaxies: clusters: individual (Virgo) -
galaxies: fundamental parameters - ultraviolet: galaxies -
ultraviolet: stars
Abstract:
We analyze three UV images covering a ~100 square degree field toward
the Virgo cluster, obtained by the FAUST space experiment. We detect
191 sources to a signal-to-noise ratio of 4.4 and identify 94% of
them. Most sources have optical counterparts in existing catalogs, and
about half are identified as galaxies. Some sources with no listed
counterpart were observed at the Wise Observatory. We present the
results of low-resolution visible spectrophotometry and discuss the
foreground 101 stellar sources and the 76 detected galaxies, both in
the cluster and in the foreground or background. We derive conclusions
on star formation properties of galaxies and on the total UV flux from
discrete and diffuse sources in the cluster. We test for the presence
of intracluster dust, determine the clustering properties of UV
emitting galaxies, and derive the UV luminosity function of Virgo
galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 76 191 Detected FAUST sources in the Virgo images
table2 73 101 Stars toward the Virgo cluster
table4 80 76 Galaxies toward the Virgo cluster-ultraviolet data
table5 80 76 Galaxies toward the Virgo cluster-multispectral data
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See also:
VII/48 : Catalogue of middle UV photometry of Virgo cluster galaxies
J/ApJS/96/461 : Far-UV Point Sources (Bowyer+ 1995)
Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Identification number
5 A1 --- n_RAh [*] Note (1)
6- 7 I2 h RAh Right ascension (1950)
9- 10 I2 min RAm Right ascension (1950)
12- 15 F4.1 s RAs Right ascension (1950)
16 A1 --- DE- Declination sign
17- 18 I2 deg DEd Declination (1950)
20- 21 I2 arcmin DEm Declination (1950)
23- 24 I2 arcsec DEs Declination (1950)
26- 30 F5.2 mag UVmag Adopted FAUST UV magnitude (2)
32- 36 F5.3 mag e_UVmag ? rms uncertainty on UVmag
37- 38 A2 --- u_UVmag [: ] Uncertainty flag on UVmag (3)
40 I1 --- Nobs Number of observations (4)
42- 60 A19 --- Ident Proposed identification
61 A1 --- n_Ident [?] Note (5)
63- 66 I4 --- FAUST ? Entry in FAUST catalog
67 A1 --- --- [/]
68- 71 I4 --- FAUST2 ? Second entry in FAUST catalog
72 A1 --- --- [/]
73- 76 I4 --- FAUST3 ? Third entry in FAUST catalog
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Note (1): An * indicates objects for which the coordinates were calculated from
an astrometric solution based in bright, well-identified stellar
images.
Note (2): The adopted UV magnitude is the average of the different FAUST
measurements. The error is the root mean square of the individual
errors.
Note (3): A colon (:) indicates a very large measurement error.
Note (4): Nobs is the number of times a source was observed, i.e., the number
of FAUST images in which it appears.
Note (5): The question mark (?) at ID 44, ID 57, and ID 69 indicates that the
proposed identification is a bit off the FAUST source.
ID 52: The UV source may be a blend of the emission from the galaxy
and the HD 108285 (A2) star.
ID 155: The three stars near the FAUST source have been observed
spectroscopically and identified with late G or K star.
The proposed identification is the faint KARA 68181 galaxy
marked on the overlays of the PSS. Note that there is a dE
galaxy (VCC 1866) a bit far from the FAUST source.
ID 164: This source is near the TD-1 26442 from the Extended TD-1
catalog (preprint). On the PSS there is a faint V>15 blue
looking candidate 123945+163743 not observed.
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 3 I3 --- Source Source number
5- 22 A18 --- Name Identification name
24- 28 A5 --- SpType Spectral classification (1)
30 A1 --- l_Vmag Limit flag on Vmag
31- 35 F5.2 mag Vmag ? V or B magnitude (2)
37 A1 --- n_Vmag [B] B: B magnitude in Vmag, else V magnitude
39- 43 F5.2 mag B-V ? B-V colour index (2)
45- 49 F5.2 mag U-B ? U-B colour index (2)
51- 55 F5.2 mag UVmag FAUST UV magnitude
56- 57 A2 --- u_UVmag [: ] Uncertainty flag on UVmag
58- 61 F4.2 mag e_UVmag ? rms uncertainty on UVmag
64- 73 A10 --- Other Other Identifications
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Note (1): The spectral classification is mainly from HIC (Cat. <I/196>), in
which case the HIC number is marked in Other
The stars classified from WiseObs spectra have the note (e) early,
or (l) late, according to the appearance or absence of spectral
features in our low-resolution spectra.
Note (2): The V, B-V and U-B data are from HIC (Cat. <I/196>), or from
SAO (Cat. <I/111>) when the star is an SAO object but not a HIC
object or from the HD (Cat. <III/135>) catalog if not in either of
the two. Seven PG objects have spectral and photometric data from
Green et al. (1986, Cat. <II/207>).
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 3 I3 --- Source Source number
5- 15 A11 --- Name Name
18- 38 A21 ---- MType Morphological type
40- 44 F5.2 mag 4*E(B-V) Reddening
47- 51 F5.2 mag UVmag FAUST UV magnitude
53- 56 F4.2 mag e_UVmag rms uncertainty on FAUST UV magnitude
58 A1 --- l_GUV Limit flag on GUV
59- 63 F5.2 mag GUV ? GUV UV magnitude (Kodaira et al.,
1990ApJ...363..422K) (1)
65- 68 F4.2 mag e_GUV ? rms uncertainty on GUV
70- 73 F4.1 mag SCAP ? SCAP UV magnitude (Donas et al.,
1987A&A...180...12D) (1)
75 A1 --- l_S+C Limit flag on S+C
76- 80 F5.2 mag S+C ? S+C UV magnitude (Smith & Cornett, 1982,
Cat. <VII/48>) (1)
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Note (1): All GUV measurements were transformed into monochromatic magnitudes.
Note that each experiment measured at different spectral segment:
GUV measured effectively at 1560{AA} with a bandwidth of FWHM=230{AA}
SCAP measured at ~2000{AA} and the passband was ~200{AA}, and the
Goddar imager (S+C) had a 1150{AA} wide passband centered
near 2421{AA}
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Byte-by-byte Description of file: table5
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Bytes Format Units Label Explanations
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1- 3 I3 --- Source Source number
5- 18 A14 --- Name Name
20- 24 A5 --- TType T Type (1)
26- 30 F5.2 mag UVmag FAUST UV magnitude
32- 35 F4.2 mag e_UVmag rms uncertainty on UVmag
37- 38 A2 --- l_FI(HI) [=< ] Limit flag on FI(HI)
39- 47 F9.5 Jy.km/s FI(HI) ? H I flux integral (from the sources
given in section 4.2)
49- 51 F3.1 Jy.km/s FI(HI)2 ? Second value of FI(HI) for N=171
52- 56 F5.2 Jy S60um ? FIR flux densities at 60{mu}m (2)
58- 62 F5.2 Jy S100um ? FIR flux densities at 100{mu}m (2)
64- 68 I5 km/s HRV ? Heliocentric radial velocity (3)
70- 74 F5.2 mag Btot ? Total B magnitude (3) (4)
75 A1 --- --- [+]
76- 80 F5.2 mag Btot+ ? Additional Btot for sources 126 and 171
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Note (1): The T type is the translation of the morphological type(s) given in
table 4, using the prescription from Table A of Tully 1988
(Cat. <VII/145>).
Note (2): From IRAS Faint Source Catalogue (Cat. <II/156>)
Note (3): Data originate from BST (Binggelli et al., 1985AJ.....90.1681B),
RC3 (Cat. <VII/155>, or UGC (Cat. <VII/26>).
Note (4): Btot has been corrected for Galactic extinction, as explained in
the text.
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 13-Oct-1997