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J/ApJ/458/455 M 104 planetary nebulae (Ford+ 1996)
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The stellar halo of M104. I. A survey for planetary nebulae and the planetary
nebula luminosity function distance
Ford H.C., Hui X., Ciardullo R., Jacoby G.H., Freeman K.C.
<Astrophys. J. 458, 455 (1996)>
=1996ApJ...458..455F (SIMBAD/NED BibCode)
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ADC_Keywords: Planetary nebulae
Keywords: distance scale - galaxies: clusters: individual (Virgo) -
galaxies: distances and redshifts - galaxies: individual (M104) -
galaxies: stellar content - planetary nebulae: general
Abstract:
We used the CTIO 4m telescope to make a complete and kinematically
unbiased survey of M104 (NGC 4594; the Sombrero galaxy) for planetary
nebulae (i.e., stars) out to 16 kpc. We present the positions and
monochromatic [O III] lambda 5007 magnitudes of 294 planetaries, and
use the observed planetary nebula luminosity function (PNLF) to
measure a distance of 8.9+/-0.6Mpc to the galaxy. The
luminosity-specific PN number lambda 2.5 in the halo of M104 is
approximately 21.7x10^-9^L_{sun}_, which for its color (B-V)=0.95,
is comparable to the values in other galaxies. We use the PNLF
distance to M104 to compare its luminosity to the luminosities of the
brightest galaxies in the Virgo Cluster, finding that if M104 were in
the Virgo Cluster, it would be the third brightest galaxy. We combined
the PNLF distance and the observed velocity corrected for Virgo infall
to calculate a Hubble constant H_0_=91+/-8km/s/Mpc. We also used the
PNLF distances to the NGC 1023 group, the Leo group, the Virgo
Cluster, and the Fornax Cluster to derive Hubble constants corrected
for Virgo infall. The values of H_0_ for M104, the NGC 1023 group, the
Virgo Cluster, and the Fornax Cluster are in excellent agreement,
suggesting that the PNLF distances and Schechter's linear infall model
provide a self-consistent representation of the Hubble expansion and
Virgo infall within most regions of the local supercluster. The
unweighted mean of the four values is H_0_=84+/-4. The value of H_0_
derived for the Leo group differs by four standard deviations from the
mean of the other four measurements. We conclude that there may be
large peculiar motions in the spatially extended Leo spur.
Objects:
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RA (2000) DE Designation(s)
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12 39 59.3 -11 37 23 M 104 = NGC 4594 = Sombrero Galaxy
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3 37 294 M 104 planetary nebulae
table6 34 17 GSC stars in the M 104 field
table7 29 21 Secondary reference stars
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 5 I5 --- PNID Identification number of planetary nebula
7- 8 I2 h RAh Right ascension (2000)
10- 11 I2 min RAm Right ascension (2000)
13- 18 F6.3 s RAs Right ascension (2000)
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination (2000)
24- 25 I2 arcmin DEm Declination (2000)
27- 31 F5.2 arcsec DEs Declination (2000)
33- 37 F5.2 mag mag m_5007_ magnitude (1)
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Note (1): m_5007_=-2.5log(flux) - 13.74, where "flux" is in erg/cm^2^/s
(Ciardullo et al., 1989ApJ...344..715C)
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Byte-by-byte Description of file: table6
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Bytes Format Units Label Explanations
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1- 4 I4 --- GSC Identification number from GSC
6- 7 I2 h RAh Right ascension (2000)
9- 10 I2 min RAm Right ascension (2000)
12- 16 F5.2 s RAs Right ascension (2000)
18 A1 --- DE- Declination sign
19- 20 I2 deg DEd Declination (2000)
22- 23 I2 arcmin DEm Declination (2000)
25- 28 F4.1 arcsec DEs Declination (2000)
30- 34 F5.2 mag Vmag V magnitude
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Byte-by-byte Description of file: table7
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Bytes Format Units Label Explanations
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1- 5 A5 --- ID Identification number
7- 8 I2 h RAh Right ascension (2000)
10- 11 I2 min RAm Right ascension (2000)
13- 17 F5.2 s RAs Right ascension (2000)
19 A1 --- DE- Declination sign
20- 21 I2 deg DEd Declination (2000)
23- 24 I2 arcmin DEm Declination (2000)
26- 29 F4.1 arcsec DEs Declination (2000)
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History: Prepared via OCR at CDS.
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(End) James Marcout, Patricia Bauer [CDS] 14-Feb-1997