J/ApJ/819/1 Wide-field photometry of the GC Palomar 5 (Ibata+, 2016)
Feeling the pull: a study of natural galactic accelerometers.
I. Photometry of the delicate stellar stream of the Palomar 5 globular cluster.
Ibata R.A., Lewis G.F., Martin N.F.
<Astrophys. J., 819, 1 (2016)>
=2016ApJ...819....1I 2016ApJ...819....1I (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, globular ; Photometry, SDSS ; Reddening ; Surveys
Keywords: dark matter; Galaxy: halo; Galaxy: kinematics and dynamics;
globular clusters: individual: Palomar 5
Abstract:
We present an analysis of wide-field photometric surveys of the
Palomar 5 globular cluster and its stellar stream, based on g- and
r-band measures together with narrow-band DDO 51 photometry. In this
first study, we use the deep (g, r) data to measure the incidence of
gaps and peaks along the stream. Examining the star-counts profile of
the stream plus contaminating populations, we find no evidence for
significant underdensities, and find only a single significant
overdensity. This is at odds with earlier studies based on
matched-filter maps derived from shallower SDSS data if the
contaminating population possesses plausible spatial properties. The
lack of substantial substructure along the stream may be used in
future dynamical simulations to examine the incidence of dark matter
sub-halos in the Galactic halo. We also present a measurement of the
relative distances along the stream, which we use to create the
deepest wide-field map of this system to date. Universe
Description:
The primary source of photometry for this project was obtained with
the MegaCam instrument at the 3.6m Canada-France-Hawaii Telescope
(CFHT) during the 2006-2008 spring observing seasons.
We also secured photometric observations of the cluster and its stream
using the Mosaic II imager on the Mayall 4m Telescope at Kitt Peak
National Observatory (KPNO) on 2010 June 4-8.
Objects:
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RA (ICRS) DE Designation(s) Dist
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15 16 05.30 -00 06 41.0 Palomar 5 = Cl Pal 5 D=23.5kpc
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 107 638649 CFHT/MegaCam catalog
table4.dat 107 364120 KPNO/Mosaic II catalog
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See also:
J/MNRAS/437/1725 : Galactic globular clusters SDSS photom. (Vanderbeke+, 2014)
J/ApJ/766/136 : Stellar encounter rates in Galactic GCs (Bahramian+, 2013)
J/ApJ/776/80 : PAndAS view of Andromeda satellites. I. (Martin+, 2013)
J/A+A/506/999 : Photometric Calibration of SNLS (Regnault+, 2009)
J/A+A/450/105 : Properties of 153 Galactic globular clusters (Bica+, 2006)
J/MNRAS/365/1357 : Absolute magnitude of GCs (Di Criscienzo+, 2006)
J/AJ/130/2140 : Abundances and velocities in globular clusters (Pritzl+, 2005)
J/AJ/130/873 : Properties of BQS objects in the SDSS DR3 area (Jester+, 2005)
J/ApJS/161/304 : Star clusters in the MW and satellites (McLaughlin+, 2005)
J/PAZh/29/253 : Globular clusters as gravitational lenses (Bukhmastova, 2003)
J/ApJ/590/797 : Param. of galactic globular clusters (Van Den Bregh+, 2003)
J/A+A/359/347 : Reddening in open and globular clusters (Dutra+, 2000)
J/AJ/109/218 : Catalogue of globular cluster profiles (Trager+ 1995)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 h RAh Hour of Right Ascension (J2000)
5- 6 I2 min RAm Minute of Right Ascension (J2000)
8- 13 F6.3 s RAs Second of Right Ascension (J2000)
15 A1 --- DE- Sign of the Declination (J2000)
16- 17 I2 deg DEd Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 26 F5.2 arcsec DEs Arcsecond of Declination (J2000)
28- 29 I2 --- CCD Megacam CCD number
32- 38 F7.2 pix xpixg X pixel position on g-band frame
40- 46 F7.2 pix ypixg Y pixel position on g-band frame
48- 53 F6.3 mag g0mag [10.9/34.5] CFHT/MegaCam extinction-corrected
g-band magnitude (1)
55- 60 F6.3 mag e_g0mag [0.001/8] g0mag uncertainty
62- 63 I2 --- gcls ? Morphological classification in g-band (G1)
65- 71 F7.2 pix xpixr X pixel position on r-band frame
73- 79 F7.2 pix ypixr Y pixel position on r-band frame
81- 86 F6.3 mag r0mag [10.6/34.4] CFHT/MegaCam extinction-corrected
r-band magnitude (1)
88- 93 F6.3 mag e_r0mag [0.001/7.8] r0mag uncertainty
95- 96 I2 --- rcls ? Morphological classification in r-band (G1)
99-100 I2 --- field CFHT field number
102-107 F6.3 mag E(B-V) [0.03/0.3] Reddening in E(B-V)
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Note (1): We used the following color equations to convert between SDSS and
MegaCam filters:
g=gSDSS-0.185(gSDSS-rSDSS)
r=rSDSS-0.024(gSDSS-rSDSS)
which we found to give a better representation of the stars in our
fields than the equations in Regnault et al. (2009, J/A+A/506/999).
See section 2 for further explanations.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 h RAh Hour of Right Ascension (J2000)
5- 6 I2 min RAm Minute of Right Ascension (J2000)
8- 13 F6.3 s RAs Second of Right Ascension (J2000)
15 A1 --- DE- Sign of the Declination (J2000)
16- 17 I2 deg DEd Degree of Declination (J2000)
19- 20 I2 arcmin DEm Arcminute of Declination (J2000)
22- 26 F5.2 arcsec DEs Arcsecond of Declination (J2000)
28- 29 I2 --- CCD Mosaic II CCD number
32- 38 F7.2 pix xpixM X pixel position on M-band frame
40- 46 F7.2 pix ypixM Y pixel position on M-band frame
48- 53 F6.3 mag M0mag [10/32.5] KPNO/MosaicII extinction-corrected
M-band magnitude
55- 60 F6.3 mag e_M0mag [0.001/8.2] M0mag uncertainty
62- 63 I2 --- Mcls ? Morphological classification in M-band (G1)
65- 71 F7.2 pix xpixD X pixel position on D-band frame
73- 79 F7.2 pix ypixD Y pixel position on D-band frame
81- 86 F6.3 mag D0mag [9.9/32.1] KPNO/Mosaic extinction-corrected
D-band magnitude
88- 93 F6.3 mag e_D0mag [0.001/8.6] D0mag uncertainty
95- 96 I2 --- Dcls ? Morphological classification in D-band (G1)
99-100 I2 --- field KPNO field number
102-107 F6.3 mag E(B-V) [0.04/0.2] Reddening in E(B-V)
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Global note:
Note (G1): Classification index as follows:
0 = noise objects
1 = galaxies
-1 = stellar objects within 1sigma of the stellar locus defined by the
CASU software, Irwin & Lewis (2001NewAR..45..105I 2001NewAR..45..105I)
-2 = stellar objects within 2sigma of the stellar locus
-9 = saturated source (same meaning for the 187 sources in table 3 = -8)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-May-2016