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J/ApJ/458/455       M 104 planetary nebulae (Ford+ 1996)

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)
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 21.7x10-9L, 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 H0=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 H0 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 H0=84±4. The value of H0 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: ------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------- 12 39 59.3 -11 37 23 M 104 = NGC 4594 = Sombrero Galaxy ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 5 I5 --- PNID Identification number of planetary nebula 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 18 F6.3 s RAs Right ascension (J2000) 20 A1 --- DE- Declination sign 21- 22 I2 deg DEd Declination (J2000) 24- 25 I2 arcmin DEm Declination (J2000) 27- 31 F5.2 arcsec DEs Declination (J2000) 33- 37 F5.2 mag mag m_5007_ magnitude (1)
Note (1): m5007=-2.5log(flux) - 13.74, where "flux" is in erg/cm2/s (Ciardullo et al., 1989ApJ...344..715C)
Byte-by-byte Description of file: table6
Bytes Format Units Label Explanations
1- 4 I4 --- GSC Identification number from GSC 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 16 F5.2 s RAs Right ascension (J2000) 18 A1 --- DE- Declination sign 19- 20 I2 deg DEd Declination (J2000) 22- 23 I2 arcmin DEm Declination (J2000) 25- 28 F4.1 arcsec DEs Declination (J2000) 30- 34 F5.2 mag Vmag V magnitude
Byte-by-byte Description of file: table7
Bytes Format Units Label Explanations
1- 5 A5 --- ID Identification number 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 29 F4.1 arcsec DEs Declination (J2000)
History: Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 14-Feb-1997
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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