2014A&A...565A..43K


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.15CEST17:43:20

2014A&A...565A..43K - Astronomy and Astrophysics, volume 565A, 43-43 (2014/5-1)

Precision astrometry of pulsars and other compact radio sources in the globular cluster M15.

KIRSTEN F., VLEMMINGS W., FREIRE P., KRAMER M., ROTTMANN H. and CAMPBELL R.M.

Abstract (from CDS):

The globular cluster (GC) M15 (NGC 7078) is host to at least eight pulsars and two low mass X-ray binaries (LMXBs), one of which is also visible in the radio regime. Here we present the results of a multi-epoch global very long baseline interferometry (VLBI) campaign aiming at i) measuring the proper motion of the known compact radio sources; ii) finding and classifying thus far undetected compact radio sources in the GC; and iii) detecting a signature of the putative intermediate mass black hole (IMBH) proposed to reside at the core of M15. We measure the sky motion in right ascension (µα) and declination (µδ) of the pulsars M15A and M15C and of the LMXB AC211 to be (µαδ)M15A=(-0.54±0.14,-4.33±0.25)mas/yr, (µαδ)M15C=(-0.75±0.09,-3.52±0.13)mas/yr, and (µαδ)AC211=(-0.46±0.08,-4.31±0.20)mas/yr, respectively. Based on these measurements we estimate the global proper motion of M15 to be (µαδ)=(-0.58±0.18,-4.05±0.34)mas/yr. We detect two previously known but unclassified compact sources within our field of view. Our observations indicate that one them is of extragalactic origin while the other one is a foreground source, quite likely an LMXB. The double neutron star system M15C became fainter during the observations, disappeared for one year and is now observable again - an effect possibly caused by geodetic precession. The LMXB AC211 shows a double lobed structure in one of the observations indicative of an outburst during this campaign. With the inclusion of the last two of a total of seven observations we confirm the upper mass limit for a putative IMBH to be Mo<500M.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M15 (NGC 7078) - pulsars: individual: M15A - pulsars: individual: M15C - astrometry - X-rays: individuals: 4U 2129+12 - techniques: interferometric

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3637 0
2 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 722 1
3 SS 433 HXB 19 11 49.5645897700 +04 58 57.824087535   16.3 13.0     A7Ib: 1966 4
4 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2368 0
5 [KGB96] NGC 7078 4 Rad 21 29 51.88 +12 10 16.9           ~ 5 0
6 PSR B2127+11F Psr 21 29 57.178 +12 10 02.91           ~ 17 0
7 PSR J2129+1210G Psr 21 29 57.95 +12 09 57.3           ~ 11 0
8 PSR B2127+11H Psr 21 29 58.184 +12 09 59.43           ~ 15 0
9 PSR B2127+11E Psr 21 29 58.187 +12 10 08.63           ~ 19 0
10 PSR B2127+11 Psr 21 29 58.24650 +12 10 01.2339           ~ 93 2
11 PSR J2129+1210D Psr 21 29 58.274 +12 09 59.74           ~ 24 0
12 4U 2129+12 LXB 21 29 58.3124 +12 10 02.670 14.50 15.70 15.8     ~ 303 1
13 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 2958 0
14 PSR J2129+1210B Psr 21 29 58.632 +12 10 00.31           ~ 21 1
15 PSR J2129+1209C Psr 21 30 01.2030 +12 10 38.159           ~ 175 2
16 [KGB96] NGC 7078 3 Rad 21 30 02.06 +12 09 04.6           ~ 6 0
17 QSO B2136+1410 QSO 21 39 01.30926937 +14 23 35.9922096     18.5 18.22   ~ 236 1
18 3C 454.3 Bla 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2571 2

    Equat.    Gal    SGal    Ecl

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