2005A&A...444..133T

Query : 2005A&A...444..133T

2005A&A...444..133T - Astronomy and Astrophysics, volume 444, 133-136 (2005/12-2)

The HI content of the recently discovered field dwarf galaxy NAME APPLES 1.

TARCHI A., OTT J., PASQUALI A., FERRERAS I., CASTANGIA P. and LARSEN S.S.

Abstract (from CDS):

We present observations in a search for neutral hydrogen associated with the recently detected field dwarf galaxy APPLES 1, performed with the Parkes radiotelescope. The observed radio spectrum shows no evident (>3σ rms) line emission indicating an upper limit for the HI content of the galaxy of ∼10⁶M_☉ and providing an upper value for the M_HI/L_B ratio equal to 2.4M_☉/L_☉. The low value of the HI content suggested by the observations, together with the galaxy optical morphology, might indicate that APPLES 1 is a dwarf spheroidal. This indication is in contrast with the evidence of recent star formation, which is typical for dwarf irregular galaxies. This may suggest that APPLES 1 belongs to the class of mixed dwarf irregular/spheroidal transition-type galaxies. We also conclude that the relatively low neutral gas mass in APPLES 1 can be explained by an extended and inefficient star formation process, without the need for a dramatic event such as enhanced star formation or a past encounter with a massive galaxy or galaxy group.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual: APPLES 1 - galaxies: dwarf - radio lines: ISM - radio lines: galaxies

Simbad objects: 22

Full paper

View the references in ADS

Number of rows : 22

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	NGC 59	GiG	00 15 25.126	-21 26 39.68	14.01	13.21	12.59	12.31		~	97	0
2	NAME Cetus Dwarf Galaxy	G	00 26 10.8	-11 03 14			13.2			~	226	0
3	NGC 185	Sy2	00 38 57.9400026024	+48 20 15.035874648		9.10	9.2			~	788	1
4	M 110	GiG	00 40 22.0572349992	+41 41 07.507220136		8.92	8.07			~	1293	1
5	NAME SMC	G	00 52 38.0	-72 48 01		2.79	2.2			~	10841	1
6	NAME Scl Group	GrG	01 00 06	-33 44.2						~	500	0
7	NAME Sculptor Dwarf Galaxy	G	01 00 09.4	-33 42 32		9.79	8.6	8.81		~	1318	4
8	NAME Pisces I	G	01 03 56.6	+21 53 41		16.18	14.3			~	379	0
9	NAME Phoenix Dwarf Galaxy	Sy1	01 51 06.3	-44 26 41		13.48	13.2	12.69		~	519	2
10	NAME IC 342 Group	GrG	03 48 42	+68 00.8						~	100	1
11	NAME Maffei Group	GrG	03 49	+68.0						~	49	0
12	NAME LMC	G	05 23 34.6	-69 45 22			0.4			~	16977	1
13	NAME M 81-82 Group	GrG	09 55	+69.1						~	704	0
14	2dFGRS TGN368Z258	LSB	11 04 40.082	+00 03 29.62		16.9				~	20	0
15	NAME CVn I Group	GrG	12 32 48.3	+33 57 07						~	141	0
16	LEDA 135809	LSB	12 50 04.754	-00 13 57.65		17.6			15.5	~	13	0
17	NAME Cen A Group	GrG	13 20 33.9	-44 58 51						~	260	0
18	NAME NGC 5236 Group	GrG	13 37 06	-29 51.9						~	61	0
19	MGC 60227	G	14 20 33.38	-00 09 29.2		19.74				~	2	0
20	NAME Tuc Galaxy	G	22 41 49.6	-64 25 10		15.7	15.2			~	294	0
21	NAME APPLES 1	G	23 15 03.3	-42 32 22						~	16	0
22	NAME Local Group	GrG	~	~						~	8147	0

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