FSR1767 - a new globular cluster in the Galaxy

Abstract

The globular cluster (GC) nature of the recently catalogued candidate FSR 1767 is established in the present work. It results as the closest GC so far detected in the Galaxy. The nature of this object is investigated by means of 2MASS colour-magnitude diagrams (CMDs), the stellar radial density profile (RDP) and proper-motions (PM). The properties are consistent with an intermediate metallicity ($\feh\approx-1.2$) GC with a well-defined turnoff (TO), red-giant branch (RGB) and blue horizontal-branch (HB). The distance of FSR 1767 from the Sun is $\ds\approx1.5$ kpc, and it is located at the Galactocentric distance $\rgc\approx5.7$ kpc. With the space velocity components $(V,W)=(184\pm 14,-43\pm 14)\mathrm{km}{\mathrm{s}}^{-1}$, FSR 1767 appears to be a Palomar-like GC with $\mv\approx-4.7$, that currently lies $\approx 57$ pc below the Galactic plane. The RDP is well represented by a King profile with the core and tidal radii $\rc=0.24\pm0.08$ pc and $\rt=3.1\pm1.0$ pc, respectively, with a small half-light radius $\rh=0.60\pm0.15$ pc. The optical absorption is moderate for an infrared GC, $A_V=6.2\pm 0.3$, which together with its central direction and enhanced contamination explains why it has so far been overlooked.

6 pages, 7 figures. MNRAS Letters, accepted

References in corpus (15)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Local stellar kinematics from Hipparcos data
• A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
• An Orphan in the "Field of Streams"
• The properties of Galactic globular cluster sub-systems
• A systematic survey for infrared star clusters with |b|<20deg using 2MASS
• Globular cluster system and Milky Way properties revisited
• Low-extinction windows in the inner Galactic Bulge
• Open clusters in dense fields: the importance of field-star decontamination for NGC5715, Lynga4, Lynga9, Trumpler23, Trumpler26 and Czernik37
• Discovery of a Faint Old Stellar System at 150 kpc
• Palomar 13's Last Stand
• Discovery of a New Low-Latitude Milky Way Globular Cluster using GLIMPSE
• Whiting 1: a new Halo Young Globular Cluster
• FSR1735 -- A new globular cluster candidate in the inner Galaxy
• AL 3 (BH 261): a new globular cluster in the Galaxy

Cited by in corpus (21)

• A general catalogue of extended objects in the Magellanic System
• Globular clusters in the Galactic bulge
• Discovery of VVV CL001. A Low-Mass Globular Cluster Next to UKS~1 in the Direction of the Galactic Bulge
• Three Galactic globular cluster candidates
• Probing FSR star cluster candidates in bulge/disk directions with 2MASS colour-magnitude diagrams
• Structural parameters of 11 faint Galactic globular clusters derived with 2MASS
• A comparative analysis of the observed white dwarf cooling sequence from globular clusters
• Discovery of Two New Globular Clusters in the Milky Way
• Investigating the age and structure of the infrared old open clusters LK1, LK10, FSR1521 and FSR1555
• On the physical nature of globular cluster candidates in the Milky Way bulge
• Exploring FSR open cluster candidates within $|\Delta \ell |=20^{\circ }$ of the Galactic anticentre
• NTT follow-up observations of star cluster candidates from the FSR catalogue
• Multi-Conjugate Adaptive Optics VLT imaging of the distant old open cluster FSR1415
• FSR0190 - Another old distant galactic cluster
• A populous intermediate-age open cluster and evidence of an embedded cluster among the FSR globular cluster candidates
• The old Galactic open clusters FSR1716 and Czernik23
• Chemical Abundances of the Highly Obscured Galactic Globular Clusters 2MASS GC02 and Mercer 5
• Gravitational interactions between globular and open clusters: an introduction
• A Probable New Globular Cluster in the Galactic Disk
• UKIRT follow-up observations of the old open cluster FSR0358 (Kirkpatrick1)
• Kinematical and dynamical properties of recently discovered bulge and disc star clusters with WINERED