The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2: a bimodal bulge?
The radial velocities of 2768 fundamental-mode RR Lyrae stars (RRLs) toward the southern Galactic bulge are presented, spanning the southern bulge from −8° < l < + 8° and −3° < b < −6°. Distances derived from the pulsation properties of the RRLs are combined with Gaia proper motions to g...
Saved in:
| Main Authors: | , , , , , , , , , , , , , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2020 May 21
|
| In: |
The astronomical journal
Year: 2020, Volume: 159, Issue: 6, Pages: 1-13 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/ab8d35 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-3881/ab8d35 Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.3847/1538-3881/ab8d35 
|
| Author Notes: | Andrea Kunder, Angeles Pérez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm, Jennifer Wojno |
MARC
| LEADER | 00000caa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 1753043565 | ||
| 003 | DE-627 | ||
| 005 | 20220819152749.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 210401s2020 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.3847/1538-3881/ab8d35 |2 doi | |
| 035 | |a (DE-627)1753043565 | ||
| 035 | |a (DE-599)KXP1753043565 | ||
| 035 | |a (OCoLC)1341402595 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 29 |2 sdnb | ||
| 100 | 1 | |a Kunder, Andrea |e VerfasserIn |0 (DE-588)1180762347 |0 (DE-627)1067845585 |0 (DE-576)520333861 |4 aut | |
| 245 | 1 | 4 | |a The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2 |b a bimodal bulge? |c Andrea Kunder, Angeles Pérez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm, Jennifer Wojno |
| 246 | 3 | 3 | |a The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR two |
| 264 | 1 | |c 2020 May 21 | |
| 300 | |a 13 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Gesehen am 01.04.2021 | ||
| 520 | |a The radial velocities of 2768 fundamental-mode RR Lyrae stars (RRLs) toward the southern Galactic bulge are presented, spanning the southern bulge from −8° < l < + 8° and −3° < b < −6°. Distances derived from the pulsation properties of the RRLs are combined with Gaia proper motions to give constraints on the orbital motions of 1389 RRLs. The majority (∼75%) of the bulge RRLs have orbits consistent with these stars being permanently bound to <3.5 kpc from the Galactic Center, similar to the bar. However, unlike the bulge giants, the RRLs exhibit slower rotation and a higher velocity dispersion. The higher velocity dispersion arises almost exclusively from halo interlopers passing through the inner Galaxy. We present 82 stars with space velocities ≳500 km s−1 and find that the majority of these high-velocity stars are halo interlopers; it is unclear if a subsample of these stars with similar space velocities has a common origin. Once the 25% of the sample represented by halo interlopers is cleaned, we can clearly discern two populations of bulge RRLs in the inner Galaxy. The first population of RRLs is not as tightly bound to the Galaxy (but is still confined to the inner ∼3.5 kpc) and is both spatially and kinematically consistent with the barred bulge. The second population is more centrally concentrated and does not trace the bar. One possible interpretation is that this population was born prior to bar formation, as their spatial location, kinematics, and pulsation properties suggest, possibly from an accretion event at high redshift. | ||
| 700 | 1 | |a Pérez-Villegas, Angeles |e VerfasserIn |4 aut | |
| 700 | 1 | |a Rich, R. Michael |e VerfasserIn |4 aut | |
| 700 | 1 | |a Ogata, Jonathan |e VerfasserIn |4 aut | |
| 700 | 1 | |a Murari, Emma |e VerfasserIn |4 aut | |
| 700 | 1 | |a Boren, Emilie |e VerfasserIn |4 aut | |
| 700 | 1 | |a Johnson, Christian I. |e VerfasserIn |4 aut | |
| 700 | 1 | |a Nataf, David |e VerfasserIn |4 aut | |
| 700 | 1 | |a Walker, Alistair |e VerfasserIn |4 aut | |
| 700 | 1 | |a Bono, Giuseppe |e VerfasserIn |4 aut | |
| 700 | 1 | |a Koch-Hansen, Andreas |e VerfasserIn |0 (DE-588)1020368721 |0 (DE-627)691194025 |0 (DE-576)360232671 |4 aut | |
| 700 | 1 | |a Propris, Roberto De |e VerfasserIn |4 aut | |
| 700 | 1 | |a Storm, Jesper |e VerfasserIn |4 aut | |
| 700 | 1 | |a Wojno, Jennifer |e VerfasserIn |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The astronomical journal |d Washington, DC : AAS Publishing, American Astronomical Society, 1998 |g 159(2020), 6, Artikel-ID 270, Seite 1-13 |w (DE-627)312175647 |w (DE-600)2003104-X |w (DE-576)090883306 |x 1538-3881 |7 nnas |a The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2 a bimodal bulge? |
| 773 | 1 | 8 | |g volume:159 |g year:2020 |g number:6 |g elocationid:270 |g pages:1-13 |g extent:13 |a The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2 a bimodal bulge? |
| 856 | 4 | 0 | |u https://doi.org/10.3847/1538-3881/ab8d35 |x Verlag |x Resolving-System |z lizenzpflichtig |3 Volltext |
| 856 | 4 | 0 | |u https://iopscience.iop.org/article/10.3847/1538-3881/ab8d35 |x Verlag |z lizenzpflichtig |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20210401 | ||
| 993 | |a Article | ||
| 994 | |a 2020 | ||
| 998 | |g 1020368721 |a Koch-Hansen, Andreas |m 1020368721:Koch-Hansen, Andreas |d 700000 |d 714000 |d 714100 |e 700000PK1020368721 |e 714000PK1020368721 |e 714100PK1020368721 |k 0/700000/ |k 1/700000/714000/ |k 2/700000/714000/714100/ |p 11 | ||
| 999 | |a KXP-PPN1753043565 |e 3901195122 | ||
| BIB | |a Y | ||
| SER | |a journal | ||
| JSO | |a {"name":{"displayForm":["Andrea Kunder, Angeles Pérez-Villegas, R. Michael Rich, Jonathan Ogata, Emma Murari, Emilie Boren, Christian I. Johnson, David Nataf, Alistair Walker, Giuseppe Bono, Andreas Koch, Roberto De Propris, Jesper Storm, Jennifer Wojno"]},"id":{"doi":["10.3847/1538-3881/ab8d35"],"eki":["1753043565"]},"origin":[{"dateIssuedKey":"2020","dateIssuedDisp":"2020 May 21"}],"relHost":[{"origin":[{"publisher":"AAS Publishing, American Astronomical Society ; Univ. of Chicago Press, Journals Division ; Institute of Physics Publ.","dateIssuedKey":"1998","dateIssuedDisp":"1998-","publisherPlace":"Washington, DC ; Chicago, Ill. ; London"}],"id":{"zdb":["2003104-X"],"eki":["312175647"],"issn":["1538-3881"]},"pubHistory":["Nachgewiesen 115.1998 - ; auch mit durchgehender Nr.-Zählung"],"part":{"extent":"13","volume":"159","text":"159(2020), 6, Artikel-ID 270, Seite 1-13","issue":"6","pages":"1-13","year":"2020"},"titleAlt":[{"title":"AJ electronic edition"}],"note":["Gesehen am 13.12.2023","Fortsetzung der Druck-Ausgabe"],"type":{"bibl":"periodical","media":"Online-Ressource"},"disp":"The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2 a bimodal bulge?The astronomical journal","recId":"312175647","language":["eng"],"title":[{"title":"The astronomical journal","title_sort":"astronomical journal"}]}],"physDesc":[{"extent":"13 S."}],"person":[{"given":"Andrea","family":"Kunder","role":"aut","display":"Kunder, Andrea","roleDisplay":"VerfasserIn"},{"family":"Pérez-Villegas","given":"Angeles","display":"Pérez-Villegas, Angeles","roleDisplay":"VerfasserIn","role":"aut"},{"family":"Rich","given":"R. Michael","roleDisplay":"VerfasserIn","display":"Rich, R. Michael","role":"aut"},{"role":"aut","display":"Ogata, Jonathan","roleDisplay":"VerfasserIn","given":"Jonathan","family":"Ogata"},{"family":"Murari","given":"Emma","roleDisplay":"VerfasserIn","display":"Murari, Emma","role":"aut"},{"family":"Boren","given":"Emilie","display":"Boren, Emilie","roleDisplay":"VerfasserIn","role":"aut"},{"roleDisplay":"VerfasserIn","display":"Johnson, Christian I.","role":"aut","family":"Johnson","given":"Christian I."},{"family":"Nataf","given":"David","roleDisplay":"VerfasserIn","display":"Nataf, David","role":"aut"},{"roleDisplay":"VerfasserIn","display":"Walker, Alistair","role":"aut","family":"Walker","given":"Alistair"},{"family":"Bono","given":"Giuseppe","roleDisplay":"VerfasserIn","display":"Bono, Giuseppe","role":"aut"},{"role":"aut","roleDisplay":"VerfasserIn","display":"Koch-Hansen, Andreas","given":"Andreas","family":"Koch-Hansen"},{"given":"Roberto De","family":"Propris","role":"aut","display":"Propris, Roberto De","roleDisplay":"VerfasserIn"},{"given":"Jesper","family":"Storm","role":"aut","display":"Storm, Jesper","roleDisplay":"VerfasserIn"},{"family":"Wojno","given":"Jennifer","display":"Wojno, Jennifer","roleDisplay":"VerfasserIn","role":"aut"}],"title":[{"subtitle":"a bimodal bulge?","title":"The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2","title_sort":"bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR2"}],"recId":"1753043565","language":["eng"],"type":{"media":"Online-Ressource","bibl":"article-journal"},"note":["Gesehen am 01.04.2021"],"titleAlt":[{"title":"The bulge radial velocity assay for RR Lyrae stars (BRAVA-RR) DR two"}]} | ||
| SRT | |a KUNDERANDRBULGERADIA2020 | ||