2019ApJ...876...39G

Query : 2019ApJ...876...39G

2019ApJ...876...39G - Astrophys. J., 876, 39-39 (2019/May-1)

Spectroscopy of NGC 4258 globular cluster candidates: membership confirmation and kinematics.

GONZALEZ-LOPEZLIRA R.A., MAYYA Y.D., LOINARD L., ALAMO-MARTINEZ K., HEALD G., GEORGIEV I.Y., ORDENES-BRICENO Y., LANCON A., LARA-LOPEZ M.A., LOMELI-NUNEZ L., BRUZUAL G. and PUZIA T.H.

Abstract (from CDS):

We present multiobject spectroscopic observations of 23 globular cluster candidates (GCCs) in the prototypical megamaser galaxy NGC 4258, carried out with the Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy instrument at the 10.4 m Gran Telescopio Canarias. The candidates have been selected based on the (u* - i') versus (i' - K_s) diagram, in the first application of the u*i'K_s method to a spiral galaxy. In the spectroscopy presented here, 70% of the candidates are confirmed as globular clusters (GCs). Our results validate the efficiency of the u*i'K_s method in the sparser GC systems of spirals, and given the downward correction to the total number of GCs, the agreement of the galaxy with the correlations between black hole mass and the total number and mass of GCs is actually improved. We find that the GCs, mostly metal-poor, corotate with the H I disk, even at large galactocentric distances.

Journal keyword(s): galaxies: evolution - galaxies: formation - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: star clusters: general - globular clusters: general

Nomenclature: Table 2: [GML2019] JHHMMSS+DDMMSS N=11, GLL JHHMMSS+DDMMSS N=2 added.

Simbad objects: 24

Full paper

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Number of rows : 24

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	M 32	IG	00 42 41.825	+40 51 54.61	9.51	9.03	8.08			~	2116	2
2	M 31	G	00 42 44.330	+41 16 07.50	4.86	4.36	3.44			~	12157	1
3	M 81	Sy2	09 55 33.1726556496	+69 03 55.062505368		7.89	6.94			~	4280	3
4	GLL J121851+471400	GlC	12 18 51.9792324792	+47 14 00.776410440						~	1	0
5	GLL J121852+472201	GlC	12 18 52.9	+47 22 02						~	1	0
6	GLL J121854+472318	GlC	12 18 54.3739032672	+47 23 18.681045432						~	1	0
7	GLL J121856+471411	GlC	12 18 56.3	+47 14 12						~	1	0
8	GLL J121857+472330	GlC	12 18 57.2	+47 23 30						~	1	0
9	M 106	Sy2	12 18 57.620	+47 18 13.39		9.14	8.41	8.11		~	2281	3
10	GLL J121859+472107	GlC	12 18 59.9955455688	+47 21 07.310934396						~	1	0
11	[GML2019] J121901+471859	GlC	12 19 01.2636634152	+47 18 59.855671368						~	1	0
12	[L2004] n4258-1220	GlC	12 19 01.5379551840	+47 19 05.841751296		21.30	20.51			~	2	0
13	GLL J121902+472048	GlC	12 19 02.0420631024	+47 20 48.848775252						~	1	0
14	GLL J121902+472125	GlC	12 19 02.9324521656	+47 21 26.074931904						~	1	0
15	GLL J121902+472043	GlC	12 19 02.9627515368	+47 20 43.156952232						~	1	0
16	[L2004] n4258-1399	GlC	12 19 08.3288730696	+47 13 56.082922392		21.20	20.48			~	2	0
17	GLL J121925+471228	GlC	12 19 25.8677203680	+47 12 28.453032180						~	1	0
18	GLL J121928+471152	GlC	12 19 28.4	+47 11 52						~	1	0
19	GLL J121929+471215	GlC	12 19 29.0715644208	+47 12 14.984429364						~	1	0
20	GLL J121934+471316	GlC	12 19 34.6728942240	+47 13 16.550699412						~	1	0
21	M 87	AGN	12 30 49.42338414	+12 23 28.0436859	10.16	9.59	8.63		7.49	~	6876	3
22	GD 153	WD*	12 57 02.3224909560	+22 01 52.634778240	11.883	13.060	13.349	13.488	13.669	DA1.2	344	0
23	Ross 640	WD*	16 28 25.0030896166	+36 46 15.846877416		14.01		13.9		DZ6	194	0
24	NGC 7331	LIN	22 37 04.0506038088	+34 24 56.800076508	10.65	10.35	9.48			~	1194	2

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