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J/ApJ/850/96   PS1 3π RRab stars within the Sgr stream   (Hernitschek+, 2017)

The geometry of the Sagittarius stream from Pan-STARRS1 3π RR Lyrae. Hernitschek N., Sesar B., Rix H.-W., Belokurov V., Martinez-Delgado D., Martin N.F., Kaiser N., Hodapp K., Chambers K.C., Wainscoat R., Magnier E., Kudritzki R.-P., Metcalfe N., Draper P.W. <Astrophys. J., 850, 96 (2017)> =2017ApJ...850...96H
ADC_Keywords: Stars, variable; Surveys; Photometry; Optical Keywords: galaxies: dwarf ; stars: variables: RR Lyrae Abstract: We present a comprehensive and precise description of the Sagittarius (Sgr) stellar stream's 3D geometry as traced by its old stellar population. This analysis draws on the sample of ∼44000 RR Lyrae (RRab) stars from the Pan-STARRS1 (PS1) 3π survey, which is ∼80% complete and ∼90% pure within 80 kpc, and extends to ≳120kpc with a distance precision of ∼3% . A projection of RR Lyrae stars within |~B|<9° of the Sgr stream's orbital plane reveals the morphology of both the leading and the trailing arms at very high contrast across much of the sky. In particular, the map traces the stream near- contiguously through the distant apocenters. We fit a simple model for the mean distance and line-of-sight depth of the Sgr stream as a function of the orbital plane angle ~Λ, along with a power-law background model for the field stars. This modeling results in estimates of the mean stream distance precise to ∼1% and it resolves the stream's line-of-sight depth. These improved geometric constraints can serve as new constraints for dynamical stream models. Description: Our analysis is based on a sample of highly likely RRab stars, as selected by Sesar+ (2017, J/AJ/153/204) from the Pan-STARRS1 3π survey. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 57 15050 PS1 RRab stars with |B| < -9 degrees
See also: I/337 : Gaia DR1 (Gaia Collaboration, 2016) II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016) J/AJ/127/2031 : Catalog of neighboring galaxies (Karachentsev+, 2004) J/AJ/127/1158 : QUEST RR Lyrae Survey first catalog (Vivas+, 2004) J/AJ/136/1645 : Spectroscopy of bright QUEST RR Lyrae stars (Vivas+, 2008) J/ApJ/731/119 : BHB candidates in Sagittarius stream (Ruhland+, 2011) J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012) J/ApJ/765/154 : RR Lyrae stars in the Catalina Sky Survey (Drake+, 2013) J/AJ/146/21 : LINEAR. II. Catalog of RR Lyrae stars (Sesar+, 2013) J/ApJS/213/9 : Catalina Surveys periodic variable stars (Drake+, 2014) J/A+A/566/A118 : A comprehensive view of Virgo stellar stream (Duffau+, 2014) J/ApJ/781/22 : Region I of La Silla QUEST RR Lyrae star survey (Zinn+, 2014) J/ApJ/809/59 : Ophiuchus stellar stream with PS1 data (Sesar+, 2015) J/ApJ/817/73 : QSOs & RR Lyrae in Pan-STARRS1 3π Data (Hernitschek+ 2016) J/ApJ/838/107 : Distances to RRab stars from WISE and Gaia (Sesar+, 2017) J/ApJ/844/L4 : PS1 RRab for tracing outer Virgo overdensity (Sesar+, 2017) J/AJ/153/204 : RR Lyrae stars from the PS1 3π survey (Sesar+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) 11- 19 F9.5 deg DEdeg [-31.1/39.3] Declination in decimal degrees (J2000) 21- 24 F4.2 --- score [0.8/1] Final RRab classification score (≥0.8) 26- 30 F5.2 mag DM [10.9/20.7] Distance modulus (1) 32- 43 F12.10 d Per [0.4/0.9] Period 45- 52 F8.5 d phi Phase offset (2) 54- 57 F4.2 mag rAmp [0.1/1.6] PS1 r-band light curve amplitude
Note (1): The uncertainty in distance modulus is 0.06(rnd)±0.03(sys) mag. Note (2): See Equation 2 of Sesar+ (2017, J/AJ/153/204).
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 28-Jun-2018
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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