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J/MNRAS/466/2006    Phoenix dwarf galaxy RV and [Fe/H] catalog (Kacharov+, 2017)

Prolate rotation and metallicity gradient in the transforming dwarf galaxy Phoenix. Kacharov N., Battaglia G., Rejkuba M., Cole A.A., Carrera R., Fraternali F., Wilkinson M.I., Gallart C.G., Irwin M., Tolstoy E. <Mon. Not. R. Astron. Soc. 466, 2006 (2017)> =2017MNRAS.466.2006K (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Galaxies, rotation ; Stars, giant ; Stars, late-type ; Abundances, [Fe/H] ; Radial velocities ; Spectroscopy Keywords: techniques: spectroscopic - galaxies: dwarf - galaxies: kinematics and dynamics - Local Group - galaxies: stellar content Abstract: Transition type dwarf galaxies are thought to be systems undergoing the process of transformation from a star-forming into a passively evolving dwarf, which makes them particularly suitable to study evolutionary processes driving the existence of different dwarf morphological types. Here we present results from a spectroscopic survey of ∼200 individual red giant branch stars in the Phoenix dwarf, the closest transition type with a comparable luminosity to 'classical' dwarf galaxies. We measure a systemic heliocentric velocity Vhelio=-21.2±1.0km/s. Our survey reveals the clear presence of prolate rotation that is aligned with the peculiar spatial distribution of the youngest stars in Phoenix. We speculate that both features might have arisen from the same event, possibly an accretion of a smaller system. The evolved stellar population of Phoenix is relatively metal-poor (<[Fe/H]≥-1.49±0.04dex) and shows a large metallicity spread (sigma[Fe/H]=0.51±0.04dex), with a pronounced metallicity gradient of -0.13±0.01dex/arcmin similar to luminous, passive dwarf galaxies. We also report a discovery of an extremely metal-poor star candidate in Phoenix and discuss the importance of correcting for spatial sampling when interpreting the chemical properties of galaxies with metallicity gradients. This study presents a major leap forward in our knowledge of the internal kinematics of the Phoenix transition type dwarf galaxy and the first wide area spectroscopic survey of its metallicity properties. Description: This catalogue provides photometry, radial velocities, metallicities, and the Ca triplet (CaT) equivalent widths of 228 stars in the field of the Phoenix dwarf galaxy observed with the FORS2 spectrograph at the VLT. 194 stars are confirmed Phoenix members. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file phxcat.dat 114 228 The catalogue
See also: J/MNRAS/424/1113 : VI photometry in Phoenix dwarf galaxy (Battaglia+, 2012) Byte-by-byte Description of file: phxcat.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Photometric ID (1) 10- 18 F9.6 deg RAdeg Right ascension (J2000) (1) 20- 29 F10.6 deg DEdeg Declination (J2000) (1) 31- 35 F5.2 mag Vmag V band magnitude (1) 37- 40 F4.2 mag e_Vmag rms uncertainty on Vmag (1) 42- 46 F5.2 mag Imag I band magnitude (1) 48- 51 F4.2 mag e_Imag rms uncertainty on Imag (1) 53- 59 F7.2 km/s HRV ?=999.99 Heliocentric radial velocity 61- 66 F6.2 km/s e_HRV ?=99.99 rms uncertainty on HRV 68- 72 F5.2 --- [Fe/H] ?=9.99 Metallicity 74- 77 F4.2 --- e_[Fe/H] ?=9.99 rms uncertainty on [Fe/H] 79- 82 F4.2 0.1nm EW1 Equivalent width of the first CaT line 84- 87 F4.2 0.1nm e_EW1 rms uncertainty on EW1 89- 92 F4.2 0.1nm EW2 Equivalent width of the second CaT line 94- 97 F4.2 0.1nm e_EW2 rms uncertainty on EW2 99-102 F4.2 0.1nm EW3 Equivalent width of the third CaT line 104-107 F4.2 0.1nm e_EW3 rms uncertainty on EW3 109-110 I2 --- SNR Signal to noise per pixel 112-114 A3 --- Memb [yes/no ] Member of Phx
Note (1): From Battaglia et al., 2012, Cat. J/MNRAS/424/1113
Acknowledgements: Nikolay Kacharov, kacharov(at)
(End) Nikolay Kacharov [MPIA, Germany], Patricia Vannier [CDS] 23-Jan-2017
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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