2010A&A...518L..58O

Query : 2010A&A...518L..58O

2010A&A...518L..58O - Astronomy and Astrophysics, volume 518, L58-58 (2010/7-2)

Herschel photometric observations of the low metallicity dwarf galaxy NGC 1705.

O'HALLORAN B., GALAMETZ M., MADDEN S.C., AULD R., BAES M., BARLOW M.J., BENDO G.J., BOCK J.J., BOSELLI A., BRADFORD M., BUAT V., CASTRO-RODRIGUEZ N., CHANIAL P., CHARLOT S., CIESLA L., CLEMENTS D.L., CORMIER D., COORAY A., CORTESE L., DAVIES J.I., DWEK E., EALES S.A., ELBAZ D., GALLIANO F., GEAR W.K., GLENN J., GOMEZ H.L., HONY S., ISAAK K.G., LEVENSON L.R., LU N., OKUMURA K., OLIVER S., PAGE M.J., PANUZZO P., PAPAGEORGIOU A., PARKIN T.J., PEREZ-FOURNON I., POHLEN M., RANGWALA N., RIGBY E.E., ROUSSEL H., RYKALA A., SACCHI N., SAUVAGE M., SCHULZ B., SCHIRM M.R.P., SMITH M.W.L., SPINOGLIO L., SRINIVASAN S., STEVENS J.A., SYMEONIDIS M., TRICHAS M., VACCARI M., VIGROUX L., WILSON C.D., WOZNIAK H., WRIGHT G.S. and ZEILINGER W.W.

Abstract (from CDS):

We present Herschel SPIRE and PACS photometeric observations of the low metallicity (Z∼0.35Z_☉) nearby dwarf galaxy, NGC 1705, in six wavelength bands as part of the Dwarf Galaxy Survey guaranteed time Herschel key program. We confirm the presence of two dominant circumnuclear IR-bright regions surrounding the central super star cluster that had been previously noted at mid-IR wavelengths and in the sub-mm by LABOCA. On constructing a global spectral energy distribution using the SPIRE and PACS photometry, in conjunction with archival IR measurements, we note the presence of an excess at sub-mm wavelengths. This excess suggests the presence of a signicant cold dust component within NGC 1705 and was modeled as an additional cold component in the SED. Although alternative explanations for the sub-mm excess beyond 350µm, such as changes to the dust emissivity cannot be ruled out, the most likely explanation for the observed submillimetre excess is that of an additional cold dust component.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - dust, extinction - evolution

Simbad objects: 4

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Number of rows : 4

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	[CSW2006] D2	PoG	04 54 12.420	-53 21 45.07						~	4	0
2	NAME NGC 1705 CL* A	Cl*	04 54 13.24	-53 21 36.1						~	42	0
3	NGC 1705	SBG	04 54 13.4661493464	-53 21 39.471592428	12.32	12.96	12.56	12.58	12.9	~	647	1
4	[CSW2006] D1	PoG	04 54 14.590	-53 21 36.20						~	4	0

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