J/ApJ/582/170 M51 Planetary Nebula Candidates (Durrell+, 2003)
Kinematics of planetary nebulae in M51's tidal debris.
Durrell P.R., Mihos J.C., Feldmeier J.J., Jacoby G.H., Ciardullo R.
<Astrophys. J. 582, 170 (2003)>
=2003ApJ...582..170D 2003ApJ...582..170D
ADC_Keywords: Planetary nebulae ; Photometry ; Galaxies, nearby
Keywords: galaxies: individual (M51) - galaxies: interactions -
galaxies: kinematics and dynamics - planetary nebulae: general
Abstract:
We report the results of a radial velocity survey of planetary nebulae
(PNe) located in the tidal features of the well-known interacting
system NGC 5194/95 (M51). We find clear kinematic evidence that M51's
northwestern tidal debris consists of two discrete structures that
overlap in projection - NGC 5195's own tidal tail and diffuse material
stripped from NGC 5194. We compare these kinematic data to a new
numerical simulation of the M51 system and show that the data are
consistent with the classic "single-passage" model for the encounter,
with a parabolic satellite trajectory and a 2:1 mass ratio. We also
comment on the spectra of two unusual objects: a high-velocity PN that
may be associated with NGC 5194's halo and a possible interloping
high-redshift galaxy.
Description:
The detection of M51's PN candidates was reported in full in Feldmeir
et al. (1997, Cat. J/ApJ/479/231; here we briefly summarize their
results. The original data were taken with the KPNO 4m telescope and
the T2KB detector. PN candidates were defined as point sources
detected manually that were present on co-added images taken through a
redshifted [O III] λ5007 filter (central wavelength 5017Å
FWHM 31Å) but not present on similarly co-added frames taken
through a broader (275Å FWHM) off-band filter
(λc=5300Å).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 64 M51 Planetary Nebula Candidates
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See also:
J/ApJ/479/231 : PNe in M51, M96 + M101 (Feldmeier+ 1997)
J/ApJ/414/454 : NGC 3379 planetary nebulae radial velocities (Ciardullo+ 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 30 F3.1 arcmin Riso Galactocentric radius
32- 36 F5.2 mag m5007 Magnitude at 5007Å
38- 40 I3 km/s RV ? Radial velocity
42- 48 A7 --- Note Notes (1)
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Note (1): Notes use the following symbols:
G = Object is probably a background Lyα galaxy (see Chap. 6.1
or details)
N = no emission line detected
S = part of the Feldmeir et al. (1997, Cat. J/ApJ/479/231)
statistical subsample used to derive the system's distance
T = planetary is west of NGC 5195 in a tidal tail.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 21-Feb-2003