Contingut
Imatges
Carregar la teva Imatge
DSS Images Other Images
Articles Relacionats
Near-Infrared Spectroscopy of the Blue Compact Dwarf Galaxy Markarian 59
We present near-infrared (NIR) spectroscopic observations of the bluecompact dwarf (BCD) galaxy Markarian 59 (Mrk 59), obtained with theTripleSpec spectrograph mounted on the 3.5 m Apache Point Observatorytelescope. The NIR spectrum of Mrk 59, which covers the 0.90 ?m-2.40?m wavelength range, shows atomic hydrogen, molecular hydrogen,helium, sulfur, and iron emission lines. The NIR data have beensupplemented by a Sloan Digital Sky Survey optical spectrum. We foundextinction in the BCD to be low (A(V) = 0.24 mag) and to be the same inboth the optical and NIR ranges. The NIR light does not reveal hiddenstar formation. The H2 emission comes from dense clumps andthe H2 vibrational emission-line intensities can be accountedfor by photon excitation. No shock excitation is needed. A CLOUDYphotoionization model of Mrk 59 reproduces well the observed optical andNIR emission-line fluxes. There is no need to invoke sources ofionization other than stellar radiation. The [Fe II] 1.257 and1.643 ?m emission lines, often used as supernova shock indicators inlow-excitation high-metallicity starburst galaxies, cannot play such arole in high-excitation low-metallicity H II regions such as Mrk59.
|
Enviar un nou article
Enllaços Relacionats
- - No s'ha trobat enllaços -
Enviar un nou enllaç
Membre dels grups següents:
|
Dades d'Observació i Astrometria
| Constel·lació: | Libra |
| Ascensió Recta: | 15h02m46.76s |
| Declinació: | -15°03'00.3" |
| Magnitud Aparent: | 8.428 |
| Distancia: | 260.417 parsecs |
| Moviment propi RA: | -7.1 |
| Moviment propi Dec: | -2 |
| B-T magnitude: | 8.514 |
| V-T magnitude: | 8.436 |
Catàlegs i designacions:
|
